RTGS versus deferred net settlement

IN ONE LINE

Analogy: coffee tabs.

You can pay for each coffee the moment you order it — safe for the café, but you need cash in your pocket all day.

Or the café runs a tab and you settle once at closing — easier on your wallet, but the café is trusting you until then.

Payment systems face exactly this choice.

Some settle every single payment immediately, one by one, with money that is instantly and finally moved.

Others let obligations pile up during the day, cancel out what banks owe each other in both directions, and settle only the difference at agreed times.

Neither answer is simply better: paying instantly needs a lot of ready money, and running the tab means someone is exposed if a participant fails before closing time.

WHAT IT ACTUALLY IS

Real-time gross settlement (RTGS) systems settle each payment individually — gross — and immediately, in central bank money, with finality at the moment of settlement.

There is no credit exposure between participants: the money either moves now or the payment waits.

Deferred net settlement (DNS) systems accumulate obligations, offset them multilaterally, and settle net positions at designated times.

Netting is powerful — the amounts that finally move are a small fraction of the amounts cleared — so DNS is cheap on liquidity but leaves participants exposed to each other between settlement moments.

The mapping to use cases follows: high-value interbank payments favour RTGS, where a large unsettled position is intolerable; high-volume retail batches favour DNS, where liquidity efficiency dominates.

HOW IT WORKS

Practitioners feel the difference as timing and funding.

In an RTGS world, treasury must keep the settlement account funded through the day, large payments are scheduled deliberately, and a payment can sit in a queue purely for lack of liquidity while the bank is perfectly solvent.

In a DNS world, life revolves around cycle cut-offs and the settlement moment: positions are forecast in advance, and the feared scenario is a participant failing to fund its net position — schemes carry defences for that, from collateral and net debit caps to loss-sharing agreements, precisely because unwinding a day's netting would be chaos.

Many real systems are hybrids, mixing continuous settlement with liquidity-saving offsetting, so treat RTGS and DNS as poles of a spectrum rather than a strict binary.

THE WORDS

RTGS

A settlement model where each payment settles individually and immediately in central bank money, with no netting.

Deferred net settlement

Payments accumulate and offset over a clearing cycle; only each participant's net balance settles, at scheduled times.

READ FIRST

• Clearing and settlement mechanisms

CONNECTED TO

• CHECKPOINT Clearing and settlement checkpoint
• COMPARE RTGS vs deferred net settlement

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