Real-Time Gross Settlement

In an RTGS system, each payment instruction is processed as it arrives, without waiting for end-of-day batch processing. The central bank debits the sending bank's reserve account and credits the receiving bank's reserve account for the exact transaction amount. Settlement is final and irrevocable: once completed, the transaction cannot be reversed except with the cooperation of the receiving party.

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RTGS systems operate during defined business hours (unlike some retail instant payment systems that run 24/7). Some implementations set minimum transaction thresholds, though the major systems (Fedwire, CHAPS, T2) do not. Major RTGS systems include: Fedwire Funds Service in the US (which migrated to ISO 20022 in July 2025); CHAPS in the UK; T2, which replaced TARGET2 in March 2023, in the eurozone; and HVPS in China. These systems collectively process trillions of dollars in daily value, primarily for interbank settlement, central bank operations, and large corporate payments.

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Because RTGS settles each transaction individually in full, it requires participating banks to maintain sufficient intraday liquidity in their central bank reserve accounts. Central banks typically provide intraday credit (repos against eligible collateral) to help banks manage their liquidity positions throughout the day. Intraday liquidity management is a significant treasury function for banks with large payment volumes.

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RTGS differs from retail instant payment systems (FedNow, Faster Payments, SEPA Instant) in purpose and scale: RTGS handles high-value interbank and corporate payments with no per-transaction value cap; retail instant payment systems handle consumer and small business transactions with maximum value limits.

RTGS is the bedrock of financial system stability. By providing immediate, irrevocable settlement in central bank money (which carries no credit risk), RTGS eliminates the settlement risk that would otherwise exist in high-value payment flows. If a large bank were to fail between the time it sent a payment and the time settlement occurred under a deferred net settlement system, the receiving bank might not receive the funds. RTGS removes this risk entirely by settling immediately.

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For corporate treasury teams, RTGS enables same-day settlement of time-critical large payments: commercial real estate transactions, securities purchases, large supplier payments, and intercompany funding. The certainty of final settlement within the business day supports cash management precision that deferred settlement systems cannot provide.

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ISO 20022 migration of major RTGS systems is improving the data quality and automated processing of high-value payment flows. CHAPS migrated to ISO 20022 in June 2023; Fedwire migrated in July 2025. The richer structured data in ISO 20022 messages enables better automated matching, compliance screening, and reconciliation for the institutions that route payments through RTGS.