SEPA SCT Inst is the European Payments Council's instant-payment overlay on SCT. The rail is 24/7/365, settles in under 10 seconds end-to-end, and is mandatory for all euro-area PSPs from January 2025 (under the EU Instant Payments Regulation 2024/886).
The customer-facing message is still pain.001.001.09. The differentiator is the requested execution date — set to the current ISO-8601 instant — and the SvcLvl code SEPA plus LclInstrm code INST (the rulebook 2026 codes). Settlement runs on the TIPS rail (TARGET Instant Payment Settlement) operated by the Eurosystem, or RT1 operated by EBA Clearing.
The €100,000 per-transaction cap was the historical ceiling; the 2024 IPR removed it (PSPs may set their own limits, but no scheme cap). Most PSPs have moved to a €100,000–€1m bracket per their fraud-risk appetite.
The originator-side requirement that bites in practice is "Verification of Payee" (VOP) — the IPR mandates VOP must run before every SCT Inst, returning match / close-match / no-match before the PSP commits the funds. The corporate-side response is to integrate VOP at the same UI surface as the IBAN input, not at submission time.
iso-compliant emits SCT-Inst-compatible pain.001 under profile=sepa with instant=true. Time-of-day routing and TIPS / RT1 selection are bank-side concerns and not in iso-compliant's scope.