SCT Inst: instant payments
SCT Inst moves euros in seconds, around the clock — and changes what banks must do about availability, liquidity, timeouts, and certainty.
L0 Explain simply
An everyday analogy: an ordinary SCT is a letter — reliable, but it works in daily collections and deliveries. SCT Inst is a text message: it goes now, any hour, any day, and you watch for the delivery tick. The tick matters as much as the message. Within seconds, the sender's bank must learn whether the money is guaranteed to the recipient or definitely not coming, because the sender is standing at a checkout, or splitting a bill, waiting to see the answer. That immediacy is the whole product — and it is also the whole engineering problem, because every system in the chain now has to answer in seconds, at three in the morning, on a public holiday.
L1 Core concepts
SCT Inst is the EPC's instant credit transfer scheme: euro payments processed around the clock, every day of the year, with the funds made available to the beneficiary and a positive or negative confirmation returned to the originator's PSP within seconds. The 2025 rulebook sets a target of five seconds for that confirmation to arrive, and EU law — the Instant Payments Regulation — caps the whole journey at ten seconds. The instruction travels as a pacs.008, like a normal SCT, but the beneficiary PSP must answer immediately with a pacs.002 accepting or rejecting the payment, and once accepted the transfer is final from the originator's point of view: getting money back afterwards means a recall, not a cancellation.
L2 Practitioner view
For the institution, instant is an operating model, not a message format. There are no batch windows to hide in: liquidity must be in place on the settlement account continuously, including weekends, which is why participants pre-fund positions at TIPS or RT1 rather than relying on daytime treasury. Screening, fraud checks, and posting must all complete inside the seconds budget. The hardest operational case is the timeout: if the confirmation does not arrive in time, the originator PSP cannot silently assume failure — the payment may have succeeded downstream — so it must resolve the true status through the scheme's inquiry procedure before telling the customer anything definitive. Euro-area PSPs are now required by EU law to both receive and send instant credit transfers, so 'we do not offer instant' has stopped being an available answer.
L3 Technical details
The 2025 rulebook's clock works in layered deadlines, all counted from the originator PSP's acceptance timestamp. Five seconds is the target for the originator PSP to receive the pacs.002 confirmation. If the CSM has no answer from the beneficiary side by seven seconds, it generates a negative confirmation itself. Nine seconds is the latest the originator PSP may receive any confirmation, keeping the end-to-end journey inside the ten-second maximum EU law imposes; if nothing arrives, the originator's funds must not stay blocked beyond that window, and the true outcome is established afterwards through the status inquiry procedure. These numbers tightened sharply in the 2025 rulebook — the target halved from ten seconds to five, and the timeout fell from twenty seconds to seven — which is why timeout handling designed against the older rulebook needed rework.
Sources & standards1
- Scheme-specific rule2025 version 1.1 (EPC004-16)
2025 SEPA Instant Credit Transfer rulebook ↗ — European Payments Council · 2025 SCT Inst rulebook — execution time target and time-out deadlines
Version 1.1 replaced version 1.0 at publication on 5 October 2025 and is stated to remain in effect up to 21 November 2027. The EPC states it is compliant with Regulation (EU) 2024/886, the Instant Payments Regulation.
L4 Standards & sources
Two source layers govern this topic. The EPC's SCT Inst rulebook — currently the 2025 rulebook, version 1.1, in force since 5 October 2025 — defines the scheme mechanics: the five-second target, the seven-second CSM timeout, the nine-second latest confirmation, and the inquiry procedures. Above it, the EU Instant Payments Regulation imposes the ten-second maximum and mandatory send-and-receive capability for euro-area PSPs, and it also constrains how instant transfers may be priced relative to ordinary ones. Settlement runs on infrastructure the rulebook deliberately does not prescribe: TIPS, the Eurosystem's service, settles instant payments one by one in central bank money, around the clock; RT1, EBA Clearing's system, provides pan-European instant processing with its own funding model. Verify current versions — this scheme has changed faster than any other part of SEPA.
Sources & standards3
- Scheme-specific rule2025 version 1.1 (EPC004-16)
2025 SEPA Instant Credit Transfer rulebook ↗ — European Payments Council · 2025 SCT Inst rulebook version 1.1, in force 5 October 2025
Version 1.1 replaced version 1.0 at publication on 5 October 2025 and is stated to remain in effect up to 21 November 2027. The EPC states it is compliant with Regulation (EU) 2024/886, the Instant Payments Regulation.
- Official requirement
What is TIPS? (TARGET Instant Payment Settlement) ↗ — European Central Bank · TIPS service description — 24/7 settlement in central bank money
TIPS also settles instant payments in Swedish krona and Danish krone; detailed user documentation is published separately by the ECB.
- Official requirement
EBA CLEARING payment systems (STEP2-T and RT1) ↗ — EBA CLEARING · RT1 instant payment system
Participant rulebooks and full technical documentation for STEP2 and RT1 are not public; content here relies on the operator's public pages.
SEE THE PAYMENT MOVE
Read the steps as text
- 02ProcessingBank Alfa validates in real timeBank Alfa (debtor agent)
Format checks, balance check, and sanctions screening all happen in seconds. Anything slow here burns the scheme's time budget.
Screening checkpoint: Real-time transaction screening — Instant rails force screening to be fast and highly automated — there is no batch window to hide latency in.
- 03PostingThe debtor's funds are reservedBank Alfa (debtor agent)
Bank Alfa earmarks the amount. The final debit is confirmed only when the beneficiary bank accepts — instant payments are all-or-nothing.
- RESERVE Debtor's current account at Bank Alfa — EUR 480.00
- 06ProcessingNordbank decides — nowNordbank (creditor agent)
The creditor agent validates the account and screens the payment, then must answer positively or negatively within the scheme's window.
- 08SettlementSettlement happens immediately from prefunded positionsBank Alfa (debtor agent) → Nordbank (creditor agent)
The CSM moves the amount between the banks' prefunded positions in central bank money the moment the positive answer arrives. There is no waiting for a cycle.
- DR Bank Alfa prefunded position — EUR 480.00
- CR Nordbank prefunded position — EUR 480.00
- 09PostingThe creditor is credited within secondsNordbank (creditor agent)
The beneficiary can use the money immediately. Bank Alfa converts the reservation into a final debit at the same moment.
- CR Creditor's current account at Nordbank — EUR 480.00
Sources for this topic4
- Scheme-specific rule2025 version 1.1 (EPC004-16)
2025 SEPA Instant Credit Transfer rulebook ↗ — European Payments Council · 2025 SCT Inst rulebook version 1.1, in force 5 October 2025
Version 1.1 replaced version 1.0 at publication on 5 October 2025 and is stated to remain in effect up to 21 November 2027. The EPC states it is compliant with Regulation (EU) 2024/886, the Instant Payments Regulation.
- Official requirement
What is TIPS? (TARGET Instant Payment Settlement) ↗ — European Central Bank · TIPS service description
TIPS also settles instant payments in Swedish krona and Danish krone; detailed user documentation is published separately by the ECB.
- Official requirement
EBA CLEARING payment systems (STEP2-T and RT1) ↗ — EBA CLEARING · RT1 instant payment system
Participant rulebooks and full technical documentation for STEP2 and RT1 are not public; content here relies on the operator's public pages.
- Simplified educational illustration
Payments Signal editorial teaching models — Payments Signal
What this simplifies: The text-message analogy and the linked flow compress screening, liquidity reservation, and CSM routing into single steps and use fictional banks. Second-level deadlines are quoted from the rulebook version named above and will change with future versions; the legal obligations summarised from the Instant Payments Regulation are a plain-language digest, not legal advice.
Used wherever diagrams, scenarios, figures, or example values are didactic constructions rather than sourced facts; every such use carries a simplifications disclosure. All people, companies, banks, and list entries in examples are fictional.
Deepest material on this page: L4 — Standards & sources. Where a topic stops short of implementation depth, that is a deliberate coverage decision, not an oversight — see coverage.