CHAPS and RTGS

38.0 What this chapter gives you#

1. You will be able to explain why a conveyancer waits for CHAPS rather than sending a Faster Payment, even though Faster Payments is quicker and free.
2. You will be able to state the trade at the heart of gross settlement: it removes the risk that a counterparty fails while owing you, and charges for it in cash kept parked and idle.
3. You will be able to describe how a direct participant manufactures intraday liquidity by pledging collateral, and why the real constraint is encumbrance rather than owned cash.
4. You will be able to explain what the Liquidity Saving Mechanism does, and why marking a payment urgent or non-urgent is a real decision with consequences in minutes and in liquidity.
5. You will be able to name the three points of finality in the CHAPS rulebook and say which one makes a payment unrecallable.
6. You will be able to explain why designation under the Settlement Finality Regulations 1999 is what lets the seller’s solicitor pick up the phone and release the keys.
7. You will be able to work backwards from the 2pm conveyancing convention through your own bank’s cut-off to the scheme’s 17:40 deadline, and say why the earliest one governs.
8. You will be able to explain tiering, and why “settled in central bank money” describes one leg of the journey only.
9. You will be able to recount what happened on 20 October 2014 and say why the contingency service was available and was not invoked.
10. You will be able to decide, for a given payment, whether CHAPS is worth £25 to £30 or whether you are buying a certainty you do not need.

At about eleven on a Tuesday morning, in an office above a dry cleaner’s in a market town, a licensed conveyancer refreshes a screen. She has been refreshing it for twenty minutes. On the other end of a telephone line is a client sitting in a hired van outside a house she does not yet own, with a cat in a carrier on the passenger seat and a removal crew being paid by the hour.

Nothing about this scene is unusual, and nothing about it is optional. Until a specific number appears on the conveyancer’s client account screen, the house belongs to somebody else, the keys stay in the estate agent’s safe, and the van stays parked. When the number appears, everything happens at once: a phone call, a release of keys, a chain of four other households doing the same thing in sequence within the next ninety minutes.

That number appears because of CHAPS, and CHAPS works because of a machine at the Bank of England called RTGS. Together they are the most important piece of financial infrastructure in the United Kingdom that almost nobody has heard of. In 2024 CHAPS carried 52.7 million payments worth £87.5 trillion, which is roughly 0.5% of all UK payment volumes and 91% of all sterling payment value. The average CHAPS payment was £1.7 million. Most people use it once or twice in a lifetime, pay between £25 and £30 for the privilege, and assume it is simply an expensive bank transfer that goes a bit faster.

It is not faster. Faster Payments is faster, and free, and works at midnight on a Sunday. What CHAPS gives you is something else entirely, and this chapter is about what that something is: finality, in central bank money, that cannot be undone, and what the country pays to have it.

All timings, limits, fees and figures in this chapter are accurate at the time of writing, August 2026. Payment infrastructure is a moving target, and the Bank of England has published plans to change several of these numbers before 2030.

The plain version#

Imagine a school where every class has a tub of counters in the head teacher’s office. Class 4 has a tub, Class 5 has a tub, Class 6 has a tub. Nobody carries counters around the school. If Class 5 owes Class 6 forty counters, somebody walks to the office, the head teacher takes forty counters out of Class 5’s tub and puts them in Class 6’s tub, and that is that. The counters never leave the office. What moves is which tub they are sitting in.

Now, the classes owe each other things all day long. Hundreds of times a day. There are two ways to run this.

The first way is the whiteboard. Every time one class owes another, you write it on a whiteboard in the corridor. Class 5 owes Class 6 forty. Class 6 owes Class 4 twenty. Class 4 owes Class 5 fifteen. At four o’clock the head teacher looks at the whiteboard, works out who is up and who is down overall, and moves counters between the tubs once, at the end of the day. This is enormously efficient. Hundreds of debts get settled by moving a handful of counters. Nobody has to keep many counters in their tub, because most of what they owe cancels against most of what they are owed.

There is one problem with the whiteboard, and it is a serious one. At half past three, Class 5 might collapse. The teacher walks out, the class dissolves, there is nobody to pay. All those entries on the whiteboard saying “Class 5 owes” are now just chalk. Class 6 spent the afternoon handing out biscuits on the strength of a promise that Class 5 would pay at four, and at four Class 5 does not exist. Worse, Class 6 was counting on that money to pay Class 4, so now Class 4 is short too, and the whole whiteboard has to be rubbed out and recalculated as though Class 5 had never traded at all. One collapse at 3.30 rewrites everybody’s day.

The second way is to walk to the office every single time. Class 5 owes Class 6 forty counters? Somebody walks to the office, forty counters move from one tub to the other, immediately, and the matter is closed forever. There is no whiteboard. There is nothing to rub out. If Class 5 collapses at 3.31, every payment it made before 3.30 is simply done, and nobody else is affected at all.

That second way is real-time gross settlement. “Real-time” means it happens when you ask, not at four o’clock. “Gross” means each payment moves on its own, at its full size, rather than being cancelled off against other payments first. RTGS is the head teacher’s office. CHAPS is the queue of people walking to it.

The second way is safer. It is also more expensive, and the expense is a specific and slightly surprising one: you need a lot more counters.

Here is why. Suppose Class 6 is going to send 900 counters’ worth of payments today and receive 850 back. Under the whiteboard system it only ever needs to find the 50 counter difference at four o’clock. Under the walk-to-the-office system, it depends entirely on the order. If all 900 of Class 6’s payments have to go out in the morning and the 850 coming in do not arrive until the afternoon, then Class 6 needs 900 counters sitting in its tub at nine in the morning, doing nothing, just waiting. Those 900 counters could have been doing something useful. Having them sit in a tub all morning is the price of never having a whiteboard.

That is the whole trade, and it is worth saying in one sentence, because it is the sentence this chapter exists to explain. Gross settlement removes the risk that somebody fails while owing you, and it charges you for that in cash you have to keep parked and idle.

The house#

Now the conveyancer above the dry cleaner’s.

Her client is buying a house for £340,000. At exchange of contracts, three weeks ago, the client paid a 10% deposit of £34,000. On completion day the remaining £306,000 has to reach the seller’s solicitor. Of that, £246,000 has come from a mortgage lender, and £60,000 is the client’s own savings plus the deposit already held.

At 10.52, the conveyancer instructs her bank to send £306,000 by CHAPS to the seller’s solicitor’s client account. Her firm is charged about £25 by its bank for that single instruction. Somewhere inside the machinery, the Bank of England charges her firm’s bank 48.7 pence for it, which is the 2026 CHAPS tariff per payment sent. The rest is the bank’s margin, its own liquidity cost, and its compliance department.

Within seconds, a message reaches the Bank of England. The buyer’s bank has an account there. The seller’s solicitor’s bank has an account there. £306,000 comes off one and goes onto the other. Not a promise, not an entry on a whiteboard: the actual balance changes, at the Bank of England, immediately and permanently.

And here is the part that matters to the woman in the van with the cat. From the instant that balance changes, the money cannot come back. There is no cooling-off period. The buyer cannot ring up and cancel. The bank cannot reverse it because it made a mistake. A court can order someone to pay it back afterwards, but that is a new payment going the other way, not an undoing of the first one. The seller’s solicitor, seeing the credit on her screen, can lift the phone to the estate agent and say “release the keys”, and she can do that with total confidence, because the money on her screen is not a claim on the buyer’s bank. It is settled.

That confidence is the product. Everything else, including the fee, is the cost of manufacturing it.

Now multiply it. That house is in a chain. The seller of the £340,000 house is buying a £455,000 house two streets away, and cannot send that money until the £306,000 arrives. The seller of the £455,000 house is buying a flat for £238,000. Five households, five vans, five sets of keys, all keyed off a sequence of payments that must each be final before the next one can start. If any link in that chain were reversible, the whole chain would have to wait until everyone was certain, which in practice means days. The reason a chain can complete in a single morning is that each payment in it is dead certain the moment it lands.

Where the plain version stops being true#

The counters are not scarce in the way the analogy implies#

The school story says a bank needs a big pile of money sitting idle to make payments early in the day. That is the right shape but the wrong mechanism, and the difference is the single most important thing a practitioner knows that a layperson does not.

A CHAPS direct participant does not fund its day only out of its own accumulated cash. It can, within limits, manufacture settlement money during the day by pledging assets. Eligible participants in the Bank’s Sterling Monetary Framework can generate intraday liquidity against collateral: they pledge gilts and other very high quality assets into a pool at the Bank, the Bank values that collateral, applies a haircut, and credits the participant with settlement funds it can spend across the day. At the end of the day that liquidity is extinguished and the collateral is released. Provided the collateral is there and the day balances by the close, the participant has borrowed several billion pounds from the central bank and given it back before dinner.

So the real constraint is not “how much cash does the bank own” but “how much eligible collateral can it encumber, and what is it giving up by encumbering it”. That is a subtler and more interesting cost, and it changed the industry’s behaviour after the post-crisis liquidity rules made intraday positions expensive to carry. The tub of counters is really a tub plus an overdraft facility secured on the school’s silverware.

It is not one payment at a time, economically speaking#

The plain version says each payment walks to the office on its own. Legally that is exactly right, and it stays right. Economically it stopped being the whole story on 15 April 2013, when the Bank introduced a Liquidity Saving Mechanism into CHAPS.

Participants can mark a payment as urgent or non-urgent. Urgent payments settle one at a time, immediately, exactly as described. Non-urgent payments go into a central scheduler and wait a little. Every couple of minutes the system pauses the urgent stream, runs a matching algorithm for around twenty seconds, and looks for groups of payments across different banks that broadly offset each other. Those it finds, it settles all at the same instant. Each of them is still a separate gross settlement in law, with its own finality; but because they land simultaneously, the outflows are funded by the inflows and nobody has to pre-fund the full amount.

The measured effect was large. Before the mechanism, the combined intraday liquidity requirement across CHAPS averaged around £21.2 billion. In the months after, it averaged around £16.9 billion, and the Bank’s own analysis attributed roughly £4 billion of that, about a 20% saving, to the mechanism itself. So the honest summary is that CHAPS is a gross system that has quietly borrowed one of netting’s best tricks, while keeping gross settlement’s legal guarantees. The plain version’s clean opposition between “the whiteboard” and “the walk” is a teaching device, not a description of the modern machine.

Almost nobody is actually in the room#

The school has three classes and three tubs. CHAPS has, at the time of writing, over 35 direct participants, and several thousand financial institutions that reach it through one of those participants. More than 70 organisations hold accounts allowing them to settle directly in one or more payment systems at the Bank, but the CHAPS membership itself is a small club.

This is called tiering, and it means that the sentence “CHAPS is settled in central bank money and is irrevocable” describes one leg of the journey only. If your bank is not a direct participant, your payment reaches CHAPS through a correspondent, and the leg between your bank and its correspondent is an ordinary commercial arrangement with ordinary commercial credit risk. The Bank of England has worried publicly about this for years: a 2013 Bank Quarterly Bulletin article on tiering counted around 4,500 indirect participants and identified the credit, liquidity and operational risks that concentration creates, and the Bank subsequently pressed the largest indirect participants to join directly. Those particular figures are more than a decade old and the population has changed, but the structural point has not. Central bank money is the settlement asset between direct participants. Between everybody else it is commercial bank money wearing the same coat.

And your own leg, as a customer, is not central bank money at all. What lands in the seller’s solicitor’s client account is a claim on her bank. What settled at the Bank of England is a transfer between two banks. They happen close together in time, they are causally linked, and they are not the same event.

“Same day” and “irrevocable” both need footnotes#

The plain version implies you can send a CHAPS payment whenever you like during the working day and it will land. Two things complicate that.

First, cut-offs come in layers. The CHAPS system opens at 6am each working day and closes at 6pm for bank-to-bank payments, with customer payments having to be submitted by 5.40pm. That is the scheme deadline. It is not your deadline. Every bank sets its own, earlier, customer cut-off, and those are frequently in the early afternoon, sometimes considerably earlier for instructions given in a branch or by a business channel that needs a callback. On top of that sits a market convention: under the Law Society’s Standard Conditions of Sale, if the completion money is received after 2pm, completion is treated as taking place the next working day for the purposes of the compensation and apportionment provisions. So the practical deadline in a house purchase is not 5.40pm and not the bank’s cut-off but 2pm, and every conveyancer in the country works backwards from it. The chapter brief for a house sale is early afternoon; the scheme’s own limit is nearly four hours later.

Second, “irrevocable” is a statement about the settlement, not a statement about your money being unreachable. A settled CHAPS payment cannot be pulled back; the receiving bank can be asked to return funds and may agree, but it is not obliged, and there is nothing resembling a card chargeback. That is the point of the rail. But since 7 October 2024 the Bank of England has applied reimbursement rules to in-scope retail CHAPS payments broadly aligned with those for Faster Payments, with a maximum reimbursement of £85,000 per claim for authorised push payment fraud. So a victim of a conveyancing fraud is not necessarily without remedy. The payment is still final. The remedy is a different payment, running the other way, from a different party, under a different rulebook.

CHAPS is also, second by second, not a system without limits in the way people assume. Faster Payments caps a single transaction at £1 million. CHAPS scheme rules set no maximum value at all, which is why a £4 billion money-market payment and a £306,000 house purchase travel on the same rail. What limits your payment is your own bank’s policy, not the scheme.

The technical version#

RTGS is a ledger, not a payment system#

The first correction a practitioner makes is terminological. RTGS is not a payment scheme. It is the Bank of England’s accounting infrastructure: the ledger on which sterling settlement accounts are held and on which balances move. The Bank describes it as an accounting system that underpins the settlement of sterling payments. CHAPS is a payment system that settles on it. So do others.

That distinction matters because the ledger is shared. On an average working day, over £800 billion settles across RTGS. That total is not CHAPS alone. It includes CREST, the securities settlement system, whose deliveries against payment settle in central bank money on the same ledger; it includes the net settlement obligations arising from Bacs, Faster Payments, LINK, cheque clearing and card schemes, each of which computes its own multilateral net positions and then discharges them by a small number of movements across RTGS accounts. The retail rails you use every day are, from the Bank’s point of view, a handful of large entries per day. CHAPS is the system that pushes each payment individually onto the ledger.

The core ledger itself was replaced under the Bank’s RTGS Renewal Programme. The renewed core settlement engine, RT2, completed its final transition stage and went live on 28 April 2025, and the Bank’s revised tariff framework took effect on the same date.

Settlement account balances at the Bank are central bank money: a liability of the central bank rather than of a commercial bank, with no credit risk in any conventional sense. The Bank characterises it as the ultimate secure and liquid sterling asset. When a CHAPS payment settles, the sending participant’s balance falls and the receiving participant’s balance rises, in the Bank’s books, in real time.

What “real-time gross settlement” removes, precisely#

The risk RTGS removes is settlement risk in its principal form: the risk that you have given value and your counterparty fails before giving value back. In a deferred net settlement system, an obligation exists from the moment a payment is exchanged until the moment the net position settles. Between those two moments there is an exposure. In the retail systems that exposure is managed by prefunding, caps and loss-sharing. In a high-value system moving hundreds of billions a day, an intraday exposure of that size between a small number of institutions would be a financial stability problem in its own right, and there is no plausible amount of collateral that would make it comfortable.

Real-time gross settlement removes it by construction. Because settlement occurs in real time, in central bank money, participant by participant, no intraday exposures accumulate between account holders at all. There is nothing to unwind, so there is no unwind risk: the scenario in which one participant’s failure forces recalculation of everybody else’s net positions simply cannot arise.

What it does not remove is liquidity risk, and this is where the design cost sits. Because payments settle one by one, they settle only if funds are available at that instant. A participant that has sent more than it has received needs a balance to cover the difference. Aggregate across the system and you get a queueing problem with a free-rider incentive: everybody would prefer to receive early and send late, and if everybody acts on that preference the system gridlocks. The architecture responds to that incentive in three ways: liquidity supply, liquidity saving, and behavioural rules.

Liquidity supply#

Direct participants fund their CHAPS activity from their settlement account balances. Sterling Monetary Framework participants, and certain other account holders case by case, can generate intraday liquidity secured against the very highest quality collateral with prudent haircuts, using a collateral pooling arrangement at the Bank. In the Bank’s published service description, intraday liquidity provision to support CHAPS averaged around £18 billion a day; that figure dates from the mid-2010s edition of that document and should be read as indicative of scale rather than current. CREST separately generated large volumes of liquidity through auto-collateralising repo.

The point of design principle is that the central bank is willing to supply intraday liquidity generously, against good collateral, because the alternative is a gridlocked high-value system. The constraint on a participant is therefore its collateral, its opportunity cost, and the regulatory treatment of intraday positions, rather than a hard cash balance.

Liquidity saving#

The Liquidity Saving Mechanism, live in CHAPS since 15 April 2013 and retained in the renewed service, splits the flow into urgent and non-urgent streams via a central scheduler. Urgent payments settle individually and immediately. Non-urgent payments queue for a matching cycle, which as documented runs for around twenty seconds with roughly two-minute gaps between cycles, during which the algorithm identifies groups of broadly offsetting payments from different participants and settles them simultaneously.

The legal characterisation is unchanged: each payment settles gross, individually, with its own finality. The economic characterisation is that the participants economise, because the simultaneity means outflows are funded by matched inflows. The Bank measured combined intraday liquidity requirements falling from around £21.2 billion before implementation to around £16.9 billion afterwards, and attributed around £4 billion, roughly 20%, to the mechanism.

A practitioner reading this should note the operational consequence. Marking a payment non-urgent is cheaper in liquidity terms and slower in wall-clock terms, by a matter of minutes. For a completion payment at 1.50pm, urgent is the correct choice and the extra liquidity cost is the bank’s problem. For an internal treasury sweep at 9.30am, it is not.

Behavioural rules#

The Bank sets throughput targets for CHAPS direct participants, varying by category, and monitors adherence to them. The CHAPS Reference Manual distinguishes Category A direct participants as those whose average daily CHAPS volumes, sent and received, are greater than or equal to 40,000 payments, or whose CHAPS values are greater than or equal to 3.5% of total payment values, measured over a rolling twelve-month period. The specific percentage-by-time obligations sit in participant-facing operational documentation rather than the published reference manual, so no figures are quoted here.

Alongside throughput, the scheme sets availability obligations across the day. Participants must be open to receive by 8am and must send by 10am, which prevents the pathology of a participant that logs on at noon and drains everybody else’s liquidity for two hours.

The CHAPS operating day#

The published timetable, accurate at the time of writing, is as follows. All times are UK local time on a working day, meaning Monday to Friday excluding bank and public holidays in England and Wales.

RTGS itself does not close when CHAPS does. The Bank’s 2026 consultation describes CHAPS as operating twelve hours a day, 06:00 to 18:00, Monday to Friday, with RTGS closing between 19:00 and 00:15 after end-of-day processes.

The customer and bank-to-bank distinction is a message-type distinction. Since the June 2023 migration, CHAPS uses ISO 20022. A customer credit transfer is a pacs.008; a financial institution transfer is a pacs.009. The 17:40 deadline is the pacs.008 deadline, and the twenty minutes to 18:00 exist so that participants can square their own positions between themselves after the customer flow has stopped.

Finality, in three named points#

The most precise thing in the CHAPS rulebook, and the thing most often garbled in secondary sources, is that finality is not one event. The scheme defines three.

The Point of Entry is when the payment message has entered the Swift network and is acknowledged within that network by Swift. The Point of Irrevocability is after the point at which the settlement status in RTGS changes to “settling”. The Point of Final Settlement is the point at which the settlement status in RTGS changes to “settled”. Under contingency operation in MIRS Active Mode these points are modified, with finality occurring when the settlement status in MIRS changes to “settled”.

Underpinning this is statute. CHAPS is a designated system under the Financial Markets and Insolvency (Settlement Finality) Regulations 1999. Designation is what makes finality survive an insolvency: a transfer order that has entered a designated system cannot be unwound by the ordinary retrospective effect of insolvency law, and the system’s default rules take precedence. Without designation, the whole architecture would rest on contract and would be vulnerable to a liquidator arguing that payments made on the morning of a failure should be clawed back. With designation, the settled payment is settled, and the conveyancer can release the keys.

This is also why “recall” is a misnomer in CHAPS. A participant may transmit a request to the receiving participant asking for funds to be returned, and the receiving participant may co-operate, subject to its own obligations to its customer. That is a request for a new payment in the opposite direction. Nothing reverses.

Who participates, and what it costs#

There are over 35 direct participants and several thousand financial institutions that make CHAPS payments through one of them. The Bank has progressively widened access: non-bank payment service providers became eligible for settlement accounts from 2017, and an omnibus account model was introduced in 2021 for certain arrangements. The Bank took over direct delivery of the CHAPS service itself in November 2017, having previously overseen a separate scheme company.

The economics of participation, at the time of writing, are published. Direct participants pay a per-item tariff of 42.7 pence per CHAPS payment sent for 2025 and 48.7 pence for 2026, plus an annual participation fee calculated from each participant’s percentage share of total CHAPS values over a defined historical window, applied to half of total CHAPS values. Joining is a capital project in its own right: the published onboarding fees include £30,000 to open a settlement account and £90,000 to join CHAPS, before a participant has spent anything on its own systems, testing, liquidity or staffing. Certain manual contingency operations carry fixed charges, such as £550 for a manual defund, and party-to-party transfers attract a £550 fixed administration fee if used more than twice a year.

Those numbers explain the shape of the market. The tariff is trivial per payment. The fixed costs of participation, technical conformance and round-the-clock operational cover are not, which is why the direct membership is a few dozen institutions and the indirect population is several thousand.

Against that, the end customer typically pays between £25 and £30 per CHAPS payment, and indirect participants have historically paid their correspondents in the region of £2 to £3 per payment with a maximum of about £30, according to figures published by the Bank. The gap between 48.7 pence and £25 is not primarily infrastructure cost. It is the sending bank’s liquidity, its manual checks on high-value payments, its fraud controls and its acceptance of operational risk on an irreversible instruction.

What CHAPS is actually used for#

Three families of use dominate.

Wholesale financial activity comes first by value. Financial institutions and the largest businesses use CHAPS to settle money market transactions and the sterling legs of foreign exchange trades. These are the payments that make the average transaction value £1.7 million and produce the extraordinary ratio of 91% of sterling value on 0.5% of volume.

Property is the use the public sees. CHAPS is the standard instrument for completion in England, Wales, Scotland and Northern Ireland conveyancing, because completion requires cleared, final, same-day funds and there is no other sterling rail that provides all three above £1 million, and none at all that provides finality of this legal quality. The Standard Conditions of Sale contemplate payment on completion by direct credit to the seller’s solicitor’s bank, which in practice means CHAPS.

Corporate treasury is the third. Time-critical supplier payments, tax payments, margin calls, intra-group funding and anything where a missed cut-off has a contractual or regulatory consequence.

The ISO 20022 enhanced data mandate has made the property use case explicit in the data. From 1 May 2025 the Bank mandated purpose codes and Legal Entity Identifiers for defined categories of CHAPS payment: payments between financial institutions, meaning all pacs.009 messages and pacs.008 messages where both ultimate parties fall within defined categories such as PRA-authorised deposit-takers, broker-dealers, Bank-supervised financial market infrastructures or RTGS account holders; and property payments, which must carry one of a defined set of codes.

The mandate applies to payments originated through channels controlled by the direct participant. The wider ISO 20022 programme continues: structured addresses were encouraged from November 2025 and unstructured addresses are to be rejected from November 2026, with a mandate for structured remittance data expected from November 2027.

The size of the thing#

For comparison against the rails covered elsewhere in this volume: Bacs runs a three working-day cycle of submission, processing and entry, and settles on a deferred net basis; Faster Payments settles in seconds, runs 24/7, and caps a single transaction at £1 million; CHAPS is same-day, gross, final, and uncapped by the scheme.

When it stops: 20 October 2014#

The best way to understand what RTGS is for is to read the report of the day it did not work, and the Bank commissioned and published one.

RTGS opened at 06:00 on Monday 20 October 2014. At 06:02 a system error was detected. The proximate cause was a set of configuration changes made over the weekend of 18 and 19 October to transfer a CHAPS membership from one bank to another. Those changes exposed three latent defects that had been sitting in the system unnoticed: one design defect introduced in April 2014, and two functional defects dating from the implementation of the contingency service. Nothing was hacked. Nothing was overloaded. A routine membership change met three sleeping bugs at the same moment.

The cause was identified between 07:00 and 07:32. A remediation plan was finalised at 10:30. A controlled restart began between 14:15 and 14:30. Settlement resumed at 15:15. The Bank extended the settlement day from its then-scheduled 16:20 close to 20:00. By 18:00 around 99% of payments had settled by both value and volume, and by 20:00 all of them had. The day’s total was 142,759 CHAPS payments worth £289.3 billion, against a forecast of about 145,000 payments and £276 billion. In other words, the day completed. Nothing was lost. Nine hours of the country’s high-value payment capability were simply unavailable, and then they were available again, and the backlog cleared in five hours.

The human cost landed on the property market, because property completions are the CHAPS use case with a hard deadline and vans outside. A Law Society survey with 157 responses recorded that 18% of transactions completed within the usual times, 27% were delayed by up to three hours, 24% by more than three hours, and 30% did not complete until the next day or later. Against a typical Monday of around 2,340 residential sales, the review estimated approximately 700 transactions may not have completed until the next day.

The most instructive part of the report is not the failure but the contingency decision. The Bank had, and has, a contingency service: MIRS, the Market Infrastructure Resiliency Service, operated by Swift on alternative technology at geographically remote sites, designed to let CHAPS keep settling without falling back to a deferred net model. It was not invoked. The review sets out why. Switching to MIRS was believed to be a one-way move in practice, because failing back to RTGS intraweek was a manual process carrying an increased risk of error if attempted overnight. MIRS lacked full functionality, notably the Liquidity Saving Mechanism, and offered reduced resilience relative to RTGS. And at the 14:20 decision meeting the operational and technical team advised that the fix-forward plan was well advanced and RTGS should be running by 15:00 to 15:15, which it was.

That is a rational decision and it is also the anatomy of a near miss. The contingency existed and was not used because using it was expensive and irreversible, which is exactly the condition under which contingency arrangements decay. The independent review’s recommendations, all of which the Bank accepted, addressed precisely that: test intraweek failback from MIRS so that invoking it is not a one-way door; educate participants on MIRS scenarios so the decision is not made cold; build a loss-of-integrity contingency manual with reconciliation scripts and explicit MIRS decision criteria. Alongside those came governance and engineering changes, including reconstituting the RTGS board under the Deputy Governor for Markets and Banking, which first met in that form on 12 March 2015, deferring further functional changes pending business assurance, and building a proper testing regime with independent testing, regression testing and separated test and pre-production environments.

What “RTGS goes down” actually means#

There is no second CHAPS. This is the uncomfortable structural fact. The £344 billion a day that moves through CHAPS has no alternative rail: Faster Payments cannot take a £4 billion money market payment, both because of the £1 million cap and because deferred net settlement of that value would create precisely the exposure CHAPS exists to eliminate. So resilience in CHAPS cannot be delivered by diversity of rails. It has to be delivered inside the one rail.

It is delivered in four layers. First, the primary RTGS infrastructure, now RT2, with its own redundancy. Second, MIRS, which is a genuinely different technology stack run by a different organisation in different locations, so that a defect in RTGS does not propagate. Third, the ability to extend the settlement day, to 20:00 as a contingency, which converts an availability failure into a lateness problem as long as the fault is fixed within the day. Fourth, manual and bilateral fallbacks such as party-to-party transfers and contingency transfers, which are slow, expensive, individually authorised and intended for a handful of critical payments rather than the day’s flow.

The Bank now frames its operational performance in terms of impact tolerances for important business services rather than a single uptime number. In its 2024/25 annual report it documented five incidents between July 2024 and March 2025 and stated that impact tolerances were met in every case, with all payments settling by end of day. That framing is deliberate and worth understanding: for a system like this, the question is not “was there an outage” but “did the day complete”. A ninety-minute interruption at 07:00 is an inconvenience. The same interruption at 16:30 is a housing chain that does not complete and a money market position that has to be rolled.

What changes next#

Two changes are confirmed or consulted on at the time of writing, and both are worth tracking by anyone building on these rails.

The first is hours. On 24 February 2026 the Bank published a policy statement confirming an early morning extension: CHAPS settlement will begin at 01:30 rather than 06:00, targeted for September 2027 subject to confirmation with participants. Sending during the extended window will be optional for direct participants, but all participants will be able to receive from 01:30, and each institution decides for itself when to credit received funds to customer accounts. The Bank will run an alert-and-respond support model in the early hours, with 24/7 cover retained for critical incidents.

On 18 May 2026 the Bank went further, consulting until 10 August 2026 on the path beyond that: weekend, specifically Sunday, and bank holiday settlement from 01:30 to 18:00 not before 2029; 22-hours-a-day operation across six days not before 2031; and a long-run target of either 22x7 or 23.5x7, with short daily closures for housekeeping. The stated drivers are innovation, including synchronisation and settlement of tokenised assets and stablecoin arrangements, better alignment with overseas markets for cross-border payments, and liquidity efficiency from more frequent settlement.

The second is data. The ISO 20022 enhanced data programme is not finished. Purpose codes and LEIs became mandatory for defined payment types from 1 May 2025; structured addresses become compulsory in effect from November 2026 when unstructured ones start being rejected; a structured remittance mandate is expected from November 2027. For anyone integrating with CHAPS through a direct participant, these are hard dates with rejection consequences, not aspirations.

A practitioner’s summary#

If you are choosing a rail, the decision tree is short. If the value exceeds £1 million, or the payment must be irrevocable on receipt, or a third party will act irreversibly on the credit the moment it lands, use CHAPS. If none of those is true, you are paying £25 to £30 for a certainty you do not need.

If you are operating CHAPS payments, five things matter more than the rest. Know your own bank’s customer cut-off, which is earlier than the scheme’s 17:40, and know that the conveyancing convention of 2pm is earlier still. Get the beneficiary details right the first time, because the rail has no reverse gear and your remedy is capped at £85,000 per claim for in-scope retail payments under the reimbursement rules that applied from 7 October 2024. Populate the purpose code correctly for property and financial institution payments, because since 1 May 2025 it is mandatory, not decorative. Understand that urgent and non-urgent are real settings with real consequences in minutes and in your bank’s liquidity cost. And build your operational process on the assumption that one day in some year, RTGS will be unavailable at 11am, the day will be extended, and everything will settle by evening, because that is what the record actually shows happens.

The woman in the van gets her keys because a ledger at the Bank of England changed by £306,000 and cannot change back. Everything in this chapter, all the collateral, the matching cycles, the throughput targets, the contingency stack, the three named points of finality, exists to make that one sentence true 209,401 times a day.

38.98 Common wrong ideas#

Wrong: CHAPS is the fastest UK payment rail, which is what the fee buys. Right: Faster Payments is faster, free and works at midnight on a Sunday; what CHAPS sells is finality in central bank money that cannot be undone.

Wrong: A bank needs a large pile of its own cash sitting idle to make CHAPS payments in the morning. Right: Sterling Monetary Framework participants generate intraday liquidity against pledged high-quality collateral with haircuts, so the constraint is eligible collateral and its opportunity cost, not owned cash.

Wrong: Every CHAPS payment settles strictly one at a time. Right: Legally each one does, but since 15 April 2013 the Liquidity Saving Mechanism settles groups of broadly offsetting non-urgent payments simultaneously, taking combined intraday requirements from around £21.2 billion to around £16.9 billion.

Wrong: The money in the seller’s solicitor’s client account is central bank money. Right: It is a claim on her bank; what settled at the Bank of England was a transfer between two banks, a causally linked but different event.

Wrong: The CHAPS deadline is 17:40. Right: That is the scheme deadline for customer payments; every bank sets an earlier customer cut-off, and the conveyancing convention drawn from the Standard Conditions of Sale puts the practical deadline at 2pm.

Wrong: Because a settled CHAPS payment is irrevocable, a fraud victim has no remedy. Right: The payment stays final, but since 7 October 2024 the Bank has applied reimbursement rules to in-scope retail CHAPS payments with a maximum of £85,000 per claim; the remedy is a different payment under a different rulebook.

Wrong: CHAPS has a maximum transaction value in the way Faster Payments does. Right: The scheme rules set no maximum at all, which is why a £4 billion money-market payment and a £306,000 house purchase travel on the same rail; what limits you is your own bank’s policy.

Wrong: RTGS is a payment system. Right: RTGS is the Bank of England’s accounting ledger, over £800 billion a day, carrying CREST and the net obligations of Bacs, Faster Payments, LINK, cheques and cards as well as CHAPS.

Wrong: A CHAPS payment can be recalled if you spot the error quickly. Right: A participant may request that the receiving participant return the funds, and it may refuse; a return is a new payment in the opposite direction, and nothing reverses.

Wrong: Resilience comes from being able to route round CHAPS on another rail. Right: There is no second CHAPS, so resilience is delivered inside the one rail through RT2, MIRS, extension of the settlement day to 20:00, and slow manual fallbacks for a handful of critical payments.

38.99 Chapter summary in 20 lines#

1. CHAPS carried 52.7 million payments worth £87.5 trillion in 2024, roughly 0.5% of UK payment volume and 91% of sterling payment value, averaging £1.7 million a payment.
2. It is not fast, since Faster Payments is faster and free, and what it sells instead is finality in central bank money that cannot be undone.
3. Deferred net settlement is efficient because obligations cancel, but a failure before the net settles forces everybody’s positions to be recalculated.
4. Real-time gross settlement removes that by settling each payment individually, in full, in central bank money, at the moment it is made.
5. The cost of gross settlement is liquidity, because a participant that sends before it receives needs a balance sitting ready to cover the difference.
6. Direct participants do not fund that from their own cash alone; they generate intraday liquidity against pledged collateral, extinguished by the end of the day.
7. Since 15 April 2013 the Liquidity Saving Mechanism has settled groups of offsetting non-urgent payments simultaneously, saving around £4 billion of intraday liquidity, about 20%.
8. Each of those payments still settles gross and individually in law, so CHAPS has borrowed netting’s best trick without giving up gross settlement’s guarantees.
9. RTGS is not a payment scheme but the Bank of England’s ledger, on which over £800 billion settles daily, including CREST and the net positions of every retail rail.
10. The renewed core settlement engine, RT2, went live on 28 April 2025 alongside a revised tariff framework.
11. Finality is not one event: the rulebook names the Point of Entry, the Point of Irrevocability and the Point of Final Settlement.
12. Designation under the Financial Markets and Insolvency (Settlement Finality) Regulations 1999 is what makes that finality survive an insolvency, and therefore what lets the keys be released.
13. Tiering means the guarantee describes one leg only, with over 35 direct participants sitting above several thousand institutions reaching CHAPS through a correspondent on ordinary commercial credit terms.
14. Cut-offs come in layers — 17:40 at the scheme, earlier at each bank, and 2pm by conveyancing convention — and the earliest one governs your day.
15. Direct participants pay 48.7 pence per payment sent in 2026 plus a participation fee, £30,000 to open a settlement account and £90,000 to join, while the end customer pays £25 to £30.
16. That gap is not infrastructure cost but liquidity, manual high-value checks, fraud controls and the acceptance of operational risk on an irreversible instruction.
17. Wholesale financial activity dominates by value, property completion is the use the public sees, and corporate treasury is the third family.
18. Since 1 May 2025 purpose codes and Legal Entity Identifiers have been mandatory for defined categories, with PCOM, PDEP, PLDS, HLRP, HLST and PLRF naming the property cases.
19. The outage of 20 October 2014 shows the shape of failure: a routine membership change met three latent defects, nine hours were lost, MIRS was not invoked because using it was effectively a one-way door, and the day still completed by 20:00.
20. Everything in the system — collateral, matching cycles, throughput targets, the contingency stack, the three named points of finality — exists so that a ledger entry at the Bank of England changes and cannot change back.

Sources: Bank of England published material, principally the CHAPS service pages (operating hours, direct participant numbers, uses, and reimbursement position), “A brief introduction to the Real-Time Gross Settlement system and CHAPS”, the payment and settlement statistics pages, the CHAPS Reference Manual version 28 April 2025 (points of entry, irrevocability and final settlement, Category A definition, contingency modes), the RTGS and CHAPS Annual Report 2024/25 (RT2 go-live, ISO 20022 milestones, incidents and impact tolerances, daily RTGS settlement value), the 2023 self-assessment against the Principles for Financial Market Infrastructures (Settlement Finality Regulations designation, intraday liquidity and collateral, throughput targets, MIRS), the RTGS service description (daily timetable and liquidity provision, mid-2010s edition), the RTGS and CHAPS fees pages (2025 and 2026 tariffs, participation and onboarding fees), the Quarterly Bulletin articles “How has the Liquidity Saving Mechanism reduced banks’ intraday liquidity costs in CHAPS?” (2014) and “Tiering in CHAPS” (2013), the guidance on mandating ISO 20022 enhanced data in CHAPS (purpose codes and LEIs), the policy statement “Extending RTGS and CHAPS settlement hours – early morning extension” (24 February 2026) and the consultation “Extending RTGS and CHAPS settlement hours – next steps towards near 24x7 settlement” (18 May 2026), together with the independent review of the RTGS outage on 20 October 2014 and the Bank’s published response (March 2015). Conveyancing completion practice from the Law Society Standard Conditions of Sale, fifth edition. All figures, fees and timings accurate at time of writing, August 2026.