Market Infrastructure / Learning brief
Herstatt risk, and why payment-versus-payment exists
Your notes
In simple terms / 01
What this means in plain language
When two currencies settle in different time zones, one bank can pay away its side hours before it receives the other. If the counterparty fails in that gap, the full amount is lost, not just a margin. That is Herstatt risk, and it is the reason payment-versus-payment was built.
When two currencies settle in different time zones, the two legs of a foreign-exchange trade rarely become final at the same moment. One bank may pay away the currency it sold hours before it receives the currency it bought, because each currency settles in its own national system on its own timetable. In that gap the bank has paid but has not been paid. If the counterparty fails inside the gap, the loss is the full principal the bank sent, not merely a change in the trade's value. This exposure is called Herstatt risk, after a bank whose mid-day closure left counterparties that had paid one leg exposed for the other. It is also called foreign-exchange settlement risk or cross-currency principal risk. Netting the two banks' obligations shrinks the amounts but does not close the timing gap, so principal stays at risk in between. The way to remove the exposure is to link the two legs so neither settles alone, which is what payment-versus-payment does. Herstatt risk is the reason payment-versus-payment settlement was built.
Key takeaways / 03
Three things to remember
- 01
Herstatt risk is paying the currency you sold but not receiving the currency you bought, because the legs settle at different times.
- 02
The amount at stake is the full principal of the trade, not a movement in its price.
- 03
Netting reduces the amounts but not the timing gap; only linking the legs through payment-versus-payment removes the exposure.
Practical use cases / 04
Where you would use this
A risk team measures foreign-exchange settlement exposure by the window between paying one leg and receiving the other.
A treasury desk routes eligible trades to a payment-versus-payment service to remove principal risk on settlement.
A trainer uses the Herstatt case to explain why settlement risk is treated as principal risk rather than market risk.
Worked example / 05
Put the idea into a real situation
Illustrative example: (SYNTHETIC / TRAINING ONLY) Bank Alfa sells EUR to Northstar Bank for USD. Alfa pays its euros early in the European day, when the euro system is open, and expects the dollars later, when the US system settles. For those hours Alfa has delivered its side and holds only a promise for the other. If Northstar failed in that window, Alfa's euros would be gone with no dollars arriving, a total loss of principal. Settling the same trade through a payment-versus-payment service would link the legs so neither could move without the other.
Evidence & review / 07
Evidence & review
Foreign-exchange settlement risk generally. The exposure depends on currencies, cut-off times, and whether a payment-versus-payment mechanism is used.
What this brief simplifies: The time-zone gap is drawn as a single clean window to make the exposure visible. CLS, cheque, and Confirmation of Payee scheme-specific operational detail was not re-verified against primary operator docs this pass (environment egress limits).
Sources for this brief3
- Official requirement
Principles for financial market infrastructures ↗ — CPMI and IOSCO (Bank for International Settlements) · Principal risk in foreign-exchange settlement
Published by the CPSS (now CPMI) and IOSCO; contains 24 principles plus responsibilities for authorities. This site uses it only for high-level concepts such as settlement finality.
- Market practiceMarch 2003 edition
A glossary of terms used in payments and settlement systems ↗ — CPSS (now CPMI), Bank for International Settlements · Herstatt risk and settlement risk definitions
Terminology has evolved since this edition; newer CPMI publications refine some definitions.
- Simplified educational illustration
Payments Signal editorial teaching models — Payments Signal · Fictional time-zone gap walkthrough
Used wherever diagrams, scenarios, figures, or example values are didactic constructions rather than sourced facts; every such use carries a simplifications disclosure. All people, companies, banks, and list entries in examples are fictional.