Settlement risk, finality, and CLS

IN ONE LINE

An everyday analogy: two people agree to swap currencies — one hands over dollars, the other euros.

The danger is timing.

If you send your dollars in the morning and wait for the euros in the afternoon, you are exposed all day: should the other side fail before paying, you have given up your money and received nothing.

This is not hypothetical.

In 1974 a bank called Herstatt was closed mid-afternoon after counterparties had already paid it one leg of their trades but not yet received the other — which is why this exposure is still called Herstatt risk.

The fix is simple to state: arrange things so neither leg is paid unless both are.

That principle, applied to foreign exchange, is what the rest of this topic is about.

WHAT IT ACTUALLY IS

Settlement risk is the risk that you perform your side of a payment or trade and the other side does not.

Its sharpest form is principal risk — losing the full amount, not just a price movement — and in foreign exchange (FX) it has a name, Herstatt risk, after the 1974 failure.

The defence is payment versus payment (PvP): a settlement method where one currency leg is paid out only if the matching leg is paid too, so neither party can deliver and be left empty-handed.

The system built to do this for FX is CLS (Continuous Linked Settlement): it holds both legs and settles them together, in central bank money, across the currencies it supports.

Alongside PvP sits settlement finality — the moment a payment becomes irrevocable and unconditional — because risk only truly ends when settlement is final.

HOW IT WORKS

For a treasury or operations team, the practical questions are which trades carry settlement risk and how much is removed by settling through a payment versus payment (PvP) system.

CLS (Continuous Linked Settlement) settles eligible FX (foreign exchange) trades for its member banks: the two legs are submitted, matched, and settled simultaneously on CLS's books, with the underlying currencies moving in central bank money through the relevant real-time gross settlement systems.

What this buys is the elimination of principal risk on those trades — the largest and most feared exposure — though banks still manage liquidity, because funding the pay-in schedule on time is its own discipline.

Not every trade is CLS-eligible: some currencies and some counterparties settle outside it, so a residual population settles the old way and must be managed with limits and monitoring.

Knowing which trades are protected and which are not is the core of settlement-risk management.

THE WORDS

Payment versus payment (PvP)

A settlement method that pays out one leg of a trade only if the matching leg is paid too, removing the risk of delivering one side and receiving nothing.

CLS

The global system that settles foreign exchange trades payment versus payment, so neither currency leg is paid unless the matching leg settles too.

READ FIRST

• RTGS versus deferred net settlement

CONNECTED TO

• CHECKPOINT Market plumbing checkpoint

SOURCES

• Principles for financial market infrastructures — CPMI and IOSCO (Bank for International Settlements)
• A glossary of terms used in payments and settlement systems — CPSS (now CPMI), Bank for International Settlements
• Payments Signal editorial teaching models — Payments Signal