What is interbank settlement?

Interbank settlement is the process banks use to finalize payment obligations between each other. When you send a wire transfer, your bank and the recipient's bank still owe each other money after the instruction is sent. Interbank settlement is the step where that obligation is actually paid off, usually using funds held at a central bank.

This is different from clearing. Clearing is the process of sending, checking, and confirming payment instructions before settlement happens. Settlement is the final, irrevocable transfer of value. A payment can be cleared in seconds but take longer to settle, depending on which system handles it.

What is the difference between gross and net settlement?

Banks settle obligations using one of two models. The choice affects speed, cost, and risk.

• Gross settlement processes each transaction on its own, in real time. As soon as a payment instruction arrives, the sending bank's account is debited and the receiving bank's account is credited. This is called real-time gross settlement, or RTGS. Each payment is final the moment it settles. There is no waiting for other transactions to be added in.
• Net settlement works differently. Banks build up obligations to each other throughout the day. Instead of settling each one individually, the system calculates a net amount owed and settles that single balance at set intervals, often once at the end of the day. This uses less liquidity than gross settlement, since banks only need enough funds to cover the net difference rather than every gross payment.

Both models exist for a reason. Gross settlement removes settlement risk almost entirely, which matters for large, urgent payments. Net settlement is cheaper to run and works well for high volumes of smaller payments where a short delay is acceptable.

What are the major interbank settlement systems?

Most countries run at least one RTGS system for high-value payments, often operated or overseen by the central bank. Several major systems handle the bulk of global interbank settlement:

• Fedwire: The US RTGS system, run by the Federal Reserve. Settles in central bank money in real time
• CHIPS: A US net settlement system run by The Clearing House. Uses multilateral netting to settle large volumes of USD payments efficiently
• T2: The Eurosystem's RTGS platform, used for euro-denominated interbank settlement across the eurozone
• CHAPS: The UK's RTGS system for sterling payments, run by the Bank of England

These systems rarely work alone. A single cross-border payment often passes through more than one. A USD wire might clear over SWIFT messaging, then settle through Fedwire or CHIPS depending on which banks are involved and how they are connected.

Why does settlement risk matter?

Settlement risk is the chance that one side of a transaction pays out but never receives the matching payment back. This risk is highest when payments cross time zones or currencies, since one leg can settle hours before the other.

RTGS systems exist largely to remove this risk for high-value payments. Because each transaction settles immediately and individually, there is no window where one bank has paid but the other has not. Net settlement systems carry more of this risk by design, since obligations sit unsettled for hours before the periodic settlement run. This tradeoff is why net systems are typically reserved for high-volume, lower-risk payment types, while RTGS is used for large or urgent transfers.

Why interbank settlement matters for payment platforms

For fintechs and platforms moving money across banks, interbank settlement is the layer that ultimately determines when a payment is truly final. A wire transfer might show as sent within seconds, but the underlying settlement, whether through Fedwire, CHIPS, T2, or another system, is what actually discharges the obligation between the two banks involved.

Understanding which settlement system a payment runs through helps explain timing differences in payment reconciliation. A payment that looks identical on the surface can settle in seconds through an RTGS system or take until end of day through a net settlement system, depending entirely on the rail underneath it.