What FX settlement risk actually is
Every FX trade is two payments. Sell euros against dollars and you owe euros through the euro payment system while you are owed dollars through the dollar system. Those systems run on their own calendars and clocks, so unless something binds the two payments together, one goes out before the other comes in.
That is not the risk a desk normally measures. Market risk is the change in value of a position; replacement-cost risk, which margin is sized against, is the cost of redoing a trade if a counterparty defaults before value date. Settlement risk is neither — it is the loss of the full principal amount already paid away, over a window that opens when the instruction can no longer be cancelled unilaterally, often the evening before value date, and closes only on confirmed receipt of final funds.
Herstatt risk, and why the name stuck
On 26 June 1974 the German banking authorities withdrew the licence of Bankhaus Herstatt, a mid-sized Cologne bank, during the German afternoon. Counterparties had already paid Deutsche Marks that morning against dollars due later the same day in New York; when the bank was closed, its New York correspondent stopped the outgoing dollar payments. The Deutsche Mark legs were gone and the dollar legs never came. Herstatt risk has outlived the bank by half a century because the name encodes the mechanism: the loss came from the time-zone gap between two national payment systems, not from a price move, a hedging error or a margin shortfall.
Payment versus payment: the structural answer
Payment versus payment (PvP) is a settlement mechanism in which the final transfer of one currency occurs if and only if the final transfer of the other occurs. If one side fails to fund, the other side's payment does not settle and the currency stays where it was: principal risk is not reduced by PvP, it is designed out. It is the currency analogue of delivery versus payment in securities markets, and it is codified in Principle 12 of the CPSS-IOSCO (now CPMI-IOSCO) Principles for Financial Market Infrastructures (April 2012), which requires an infrastructure settling two linked obligations to eliminate principal risk by conditioning the final settlement of one on the final settlement of the other.
How CLSSettlement works
CLS Bank International is a US-chartered Edge Act corporation supervised by the Federal Reserve, designated a systemically important financial market utility under Title VIII of the Dodd-Frank Act and overseen cooperatively with the central banks of issue. Its core service, CLSSettlement, holds accounts for its settlement members and an account of its own at each of the 18 central banks of issue. When two settlement members submit matching instructions for the two legs of a trade, CLS settles that pair gross: the two payments move simultaneously across those members' accounts on CLS's own books, and neither becomes final unless both do. That simultaneity is the PvP condition.
What is netted is the funding, not the trades. Paying in the full notional of every settled instruction would be impossible, so CLS calculates for each member a single net pay-in or pay-out obligation per currency per settlement day, multilaterally rather than bilaterally, so the cash that actually moves is a small fraction of gross settled value. The cycle is a clock and it is unforgiving: instructions are matched ahead of value date, an initial pay-in schedule is issued in the early hours Central European Time, settlement of matched instructions runs from 07:00 to 09:00 CET, and members fund their short currencies in instalments across a window that closes at 10:00 CET for the Asia-Pacific currencies, whose national payment systems shut before midday, and at 12:00 CET for the rest. A trade that misses the submission deadline drops out to bilateral settlement.
Access is tiered, and this is the part that matters most here. Settlement members hold accounts directly with CLS Bank and submit in their own name — overwhelmingly large banks. Everyone else participates as a third party: funds, corporates, non-bank financial institutions, smaller banks and most of the buy side. A third party has no account at CLS Bank; its trades reach CLSSettlement only because a settlement member submits them on its behalf, and its own leg with that member is settled by the member, not by CLS. PvP protection is a property of a particular pair of legs between particular participants: not of a currency pair, and not of a trade ticket.
What CLS does not cover
In its Quarterly Review of December 2022 the BIS analysed FX settlement risk using its Triennial Central Bank Survey of April 2022 (see our summary of that survey), estimating that about US$2.2 trillion of daily FX turnover was at risk of settlement failure — settled without PvP protection. Three exclusions do most of the work:
- Ineligible currencies. If either side of the pair is not one of the 18 CLSSettlement currencies, the trade cannot settle there at all. Much emerging-market FX falls here.
- Ineligible counterparties. If one party is neither a settlement member nor a third party of one, the trade settles bilaterally however mainstream the currencies are.
- Timing. Same-day and late-booked trades that miss the submission deadline settle outside the cycle.
CLS's answer for the first category is CLSNet, an automated bilateral payment netting calculation service covering a far wider currency set, including many currencies that are not CLS-eligible today. Be precise about what it is: CLSNet calculates net payment obligations between two parties on a common record, cutting the number and value of payments moving through correspondent banks. It does not settle and does not provide PvP — the net amounts are still paid bilaterally, and the principal risk on them remains. Netting shrinks the exposure; only PvP removes it. (For centrally cleared FX, CLS settles a CCP's PvP legs through CLSClearedFX.)
A newer pressure runs the other way. SEC Rule 15c6-1(a) as amended, with a compliance date of 28 May 2024, shortened the standard US securities settlement cycle to T+1; Canada moved a day earlier, and the EU, UK and Switzerland are targeting 11 October 2027. A non-domestic investor has much less time to source the currency to pay for a securities purchase, and some of that FX is now executed after the CLS submission deadline for the value date — pushing trades that used to settle inside PvP out into bilateral settlement.
How an FX trade can settle
A broker's flow rarely uses only one channel, so it is worth holding the whole menu in view.
| Channel | How it works | Principal (Herstatt) risk |
|---|---|---|
| CLSSettlement (PvP) | Matched instructions between two CLS settlement members settle simultaneously at CLS Bank, funded on a multilaterally netted basis. | Eliminated on the settled legs: neither payment is final unless both are. |
| On-us settlement | Both counterparties bank with the same institution, which moves both currencies across its own books. | Removed in substance where both legs move together, but concentrated on that single institution. |
| Bilateral netting, then payment | Obligations are netted per currency per value date under enforceable documentation — payment netting under Section 2(c) of an ISDA Master Agreement, or a CLSNet calculation — and the net amounts paid. | Reduced in size, not removed. The net amounts still settle without PvP. |
| Bilateral gross settlement | Each leg is paid separately through its own correspondent chain and national payment system, against standing settlement instructions. | Full principal exposed from the moment your payment becomes irrevocable until receipt is confirmed. |
| Rolled position (no delivery) | A leveraged position is rolled forward by a tom-next swap, so no principal is delivered; only margin, financing and P&L move. | No principal settlement at all. The exposure is credit and margin exposure to the counterparty instead. |
Illustrative and structural. Which channel applies depends on the currencies, the counterparties, the documentation between them and each party's own settlement arrangements — always confirm per relationship.
What the rulebooks say
Settlement is one of the few areas of FX conduct where the soft-law texts are specific. The FX Global Code, maintained by the Global Foreign Exchange Committee, addresses it head-on in Principle 35, on taking prudent measures to manage and reduce settlement risk, and Principle 50, on measuring, monitoring and mitigating it — and touches it in several more, on netting documentation, standing settlement instructions and intraday funding. Its 2021 update pushed participants toward PvP where it is available and enforceable netting where it is not.
Behind the Code sits supervisory guidance. The Basel Committee's Supervisory guidance for managing risks associated with the settlement of foreign exchange transactions (BCBS 241, February 2013) expects a bank to identify its FX settlement exposures explicitly rather than fold them into general counterparty limits. The CPMI's Facilitating increased adoption of payment versus payment (PvP) was prepared under the G20 Roadmap for Enhancing Cross-border Payments, where wider PvP adoption is a workstream rather than one of the Roadmap's numbered targets, which address the speed, cost, access and transparency of payments rather than PvP coverage. None of this is a licence condition for a broker; all of it is what an institutional counterparty's risk function reaches for when it asks how your flow settles.
Where settlement risk sits in a prime-of-prime chain
The chain runs tier 1 bank → Prime of Prime → broker → end client, with credit intermediated at each link, and settlement follows it from the top down. CLS membership sits at the top, not the bottom. The settlement members are banks; a PoP typically reaches CLSSettlement as a third party, through its FX prime broker or a settlement member, and a broker sits a layer below that again. PvP protects the leg between two settlement members. The leg your firm cares about, between your firm and your PoP, is a bilateral obligation settled outside CLS on whatever terms your documentation provides — and the give-up compounds it, because the prime broker becomes the counterparty of record and settles with the executing dealer while the client settles with the prime broker. Your settlement exposure is to the entity whose credit you are borrowing, not to the dealer that showed you the price.
Most leveraged broker flow never delivers. Where positions are rolled by tom-next swaps no principal is exchanged, so the day-to-day exposure to a PoP genuinely is a margin and credit exposure — the honest reason settlement gets so little airtime. The exception is not marginal: as soon as a client takes delivery, on a deliverable forward, a corporate hedge or a conversion funding a securities purchase, the principal risk is live and it is a multiple of the margin held against it. A due-diligence pack documenting margin methodology, close-out netting and segregation but silent on which currencies settle PvP, and against what cut-offs, has answered half the question. The execution stack determines what price you get; the settlement arrangements determine whether you get the money.
What to ask a prime of prime about settlement
These are the questions an operations team should put to every counterparty in its settlement chain — its prime of prime, its prime broker and its settlement banks:
- Access. Which of the currencies you trade settle through CLSSettlement, and is the provider a settlement member or a third party — and if a third party, through whom?
- Cut-offs. What is the provider's submission deadline relative to the CLS cycle, and what happens to a trade that misses it?
- Netting, and non-CLS currencies. Are payments netted per currency per value date, under what documentation, and is close-out netting enforceable in both jurisdictions — and where PvP is unavailable, who carries the principal exposure in the interval?
- Standing settlement instructions and escalation. How are SSIs held, verified and changed — and what is the notification timeline when a payment is late or fails?
The answers should be specific and boring. A vague answer means the exposure has not been measured, and an exposure that has not been measured is not being managed. For the surrounding vocabulary see what a prime broker does, last look for the trade-date side of counterparty conduct, and the glossary.