FRM Exam Part II · Intraday Liquidity Risk Management

Payment Systems and Settlement: RTGS, CHAPS and CLS

Updated 11 October 2026 · Fact-checked

Payment systems move money between banks. In RTGS (such as CHAPS), each payment settles individually and finally in central bank money, so a bank needs enough intraday liquidity before each payment is released. Deferred net settlement settles net positions later. CLS settles both legs of an FX trade together, removing principal settlement risk.

Understand Payment Systems and Settlement (RTGS, CHAPS, CLS)

A payment system is the set of rules and infrastructure that lets banks transfer money for themselves and their customers. At the end of the day, banks settle with each other using central bank money, meaning balances held at the central bank.

In a real-time gross settlement (RTGS) system, each payment is settled one by one, in full, in real time, and settlement is final. CHAPS (UK, sterling), Fedwire (US dollars) and TARGET2 (euro) are RTGS systems. Because every payment must be funded when it is sent, a bank needs liquidity during the day, not just at close. This is intraday liquidity. Sources include the opening balance at the central bank, incoming payments from other banks, collateralised intraday credit from the central bank, and secured borrowing.

This creates a dependency. Your outgoing payments are funded partly by incoming payments from others. If a counterparty delays payments, or a large bank has an outage, you may have to hold back your own payments or use costly credit. Banks may delay payments, so liquidity can become trapped. Gridlock is the extreme case, where everyone waits for others to pay first.

Deferred net settlement (DNS) systems collect payments over a cycle and settle only the net amount per participant at set times. This needs far less liquidity. The trade-off is credit and liquidity risk between settlement times, and a failure of one participant can cause losses or unwinding for others. Gross settlement removes much of that credit risk but uses more liquidity. Many systems use hybrid designs with liquidity-saving mechanisms such as queuing and offsetting.

Settlement risk in FX is the risk that you pay one currency but do not receive the other, often called Herstatt risk. CLS (Continuous Linked Settlement) uses payment-versus-payment (PvP): both currency legs settle only if both can be settled. This removes principal risk for trades settled in CLS. CLS also nets positions, so funding needs fall, and members fund through scheduled pay-ins. Replacement cost risk and liquidity risk can still remain.

Key formulas to remember

Net settlement obligation: Net position = Σ payments received − Σ payments sent; In DNS, only this net amount is settled per participant. A negative figure is a net payment owed.
Intraday liquidity need (peak): Peak need = largest cumulative net outflow during the day (from the running balance); Track opening balance plus cumulative receipts minus payments. The lowest point shows the liquidity needed.
Liquidity saving from netting: Saving = Gross payments − Net payment; Netting reduces funding needs, but delays final settlement and adds credit risk between cycles.
Settlement type rule: RTGS = gross, real-time, final. DNS = net, at set times. PvP = both legs or neither.; Use this to classify a system quickly in a question.
Basel intraday monitoring (concept): Intraday liquidity usage = max net debit position; available intraday liquidity = reserves plus collateral; Know the idea of daily maximum usage and available liquidity, not just the names.

How to solve Payment Systems and Settlement (RTGS, CHAPS, CLS) questions

Use this order for any payment system or settlement question.

1Identify the system type: RTGS, DNS, hybrid, or PvP such as CLS.
2Identify the risk asked about: liquidity, credit, principal settlement, operational or systemic.
3For numbers, list payments in time order and compute a running balance from the opening balance.
4Find the lowest running balance. The shortfall below zero is the intraday liquidity needed.
5Compare gross and net: net equals receipts minus payments, and the difference is the liquidity saved.
6State what remains: DNS keeps credit risk between cycles, RTGS keeps liquidity risk, CLS keeps replacement cost and funding risk.
7Pick the answer that names the mechanism precisely, such as finality, PvP or central bank money.

Quickest way: Classify, then track the lowest balance

When to use it: Use for MCQs that give a payment timeline or ask you to compare systems.

Label the system: gross or net, real-time or deferred.
Gross means high liquidity use and low credit risk. Net means low liquidity use and more credit risk.
With a timeline, add receipts and subtract payments in order. Do not use the end-of-day net figure for the peak.
For FX, ask if both legs settle together. If yes, principal risk is removed.
Eliminate options that claim risk is fully eliminated.

Common mistakes in Payment Systems and Settlement (RTGS, CHAPS, CLS)

Saying RTGS reduces liquidity needs compared with DNS.
Students link real-time with efficient.
Fix: RTGS settles gross, so it needs more intraday liquidity. DNS needs less liquidity but carries more credit risk.
Using the end-of-day net position as the intraday liquidity need.
The net figure is easy to compute.
Fix: Compute the running balance in time order. The lowest point is the peak need.
Claiming CLS removes all FX settlement risk.
PvP sounds complete.
Fix: CLS removes principal settlement risk for trades settled in it. Replacement cost risk, funding and operational risk remain, and some currencies or trades may settle outside CLS.
Treating incoming payments as certain funding.
Students assume counterparties pay on time.
Fix: Incoming payments are a source but not guaranteed. Delays by others can create liquidity strain and gridlock.
Confusing finality with netting.
Both relate to settlement.
Fix: Finality means a settled payment is irrevocable. Netting means offsetting obligations. RTGS is final per payment; DNS is final after the net settlement.

Worked examples

Example 1

Bank A opens the day with a ₹0 balance at the central bank equivalent of USD 0 and has no intraday credit. Its payments and receipts in time order are: pays USD 80m; receives USD 50m; pays USD 60m; receives USD 100m. What is the peak intraday liquidity need, and what is the end-of-day net position?

Show the solution

Start at 0.
After paying 80: balance = −80.
After receiving 50: balance = −30.
After paying 60: balance = −90.
After receiving 100: balance = +10.
The lowest balance is −90, so the peak need is USD 90m.
End-of-day net = (50 + 100) − (80 + 60) = 150 − 140 = +10m.

Answer: Peak intraday liquidity need is USD 90m; end-of-day net position is +USD 10m. The net figure understates the funding needed during the day.

Example 2

Two banks exchange payments in a day. Bank X owes Bank Y EUR 400m in total; Bank Y owes Bank X EUR 350m in total. Compare gross and deferred net settlement. How much liquidity does each approach require in total, and what is the main risk of the net approach?

Show the solution

Under RTGS, gross payments total 400 + 350 = EUR 750m settled individually.
Under DNS, the net is 400 − 350 = EUR 50m, paid by X to Y.
Liquidity saved by netting = 750 − 50 = EUR 700m of gross value not needed to be funded at settlement.
The net approach delays final settlement. If X fails before the settlement time, Y faces credit exposure up to the amounts owed, and the netting may need unwinding.

Answer: Gross settlement moves EUR 750m, net settlement only EUR 50m (a saving of EUR 700m). The main risk of DNS is credit and liquidity risk between settlement times if a participant fails.

Exam tips

Expect case-style questions asking which system or risk fits a scenario. Classify first.
For timeline problems, always compute the running balance and report the minimum.
Remember the trade-off: gross is safer but liquidity-hungry, net is liquidity-light but riskier.
For CLS, state PvP and principal risk precisely, and avoid saying all risk is removed.
Link to Basel intraday monitoring: maximum daily usage and available intraday liquidity.

Practice questions from Intraday Liquidity Risk Management

Payment Systems and Settlement (RTGS, CHAPS, CLS): frequently asked questions

How does RTGS create intraday liquidity needs?

Each payment must be funded in full when it is sent, not netted later. A bank therefore needs central bank balances, incoming payments or intraday credit during the day. The need peaks when outflows run ahead of inflows.

What is the difference between RTGS and deferred net settlement?

RTGS settles each payment individually, in real time and with finality. DNS settles net positions at set times. RTGS uses more liquidity but limits credit risk. DNS uses less liquidity but exposes participants to risk between settlements.

What is CLS and what risk does it remove?

CLS is a settlement system for FX trades that uses payment-versus-payment. Both currency legs settle together or not at all. This removes principal settlement risk, known as Herstatt risk, for trades settled through it.

What is CHAPS?

CHAPS is the UK's RTGS system for sterling payments. Payments settle individually and finally in central bank money. For the exam, treat it as a standard example of an RTGS system.