ACH vs Wire vs SEPA vs Faster Payments: Which Rail to Use When

• ACH (Automated Clearing House): The dominant US rail for domestic transfers. Free or nearly so, takes 1-3 business days, batched twice daily. Used for direct deposit, bill pay, peer-to-peer (Venmo, Zelle settle on ACH under the hood). Reversible for limited reasons within 60 days.
• Fedwire: Same-day, irrevocable, used for large or urgent transfers. $25-50 fee at most banks. Bank wire = Fedwire. Once sent, cannot be reversed except via beneficiary cooperation or fraud claim.
• RTP (Real-Time Payments): Launched 2017 by The Clearing House. Instant, 24/7, irrevocable. Settles in <10 seconds. Per-transaction limit currently $1M. Adoption growing — most major banks now support it.
• FedNow: Federal Reserve's own instant rail, launched 2023. Functionally similar to RTP. Both will likely coexist for years.
• Zelle: Not a separate rail; sits on top of RTP/ACH. Fast UX but moves money via underlying rails.

When to use what: ACH for routine domestic transfers (bill pay, friends, salary). RTP/FedNow when speed matters (paying a contractor, settling a deal). Fedwire for large amounts (>$25k) or international corresponding-bank transfers.

• Faster Payments (FPS): UK's instant rail, launched 2008. Free at most banks, settles in seconds 24/7. Per-transaction limit £1M. Dominant rail for everyday UK transfers.
• BACS: Batched, takes 3 days, used for direct debit and salary payments. Free.
• CHAPS: Same-day, irrevocable, used for very large or property-purchase transfers. £20-30 fee.
• Open Banking: Not a rail — a regulatory framework that lets fintechs initiate FPS payments from your bank account directly.

When to use what: Faster Payments for almost everything. CHAPS for £25k+ property completions. BACS for recurring payroll-type transfers (handled by your employer's HR).

• SEPA Credit Transfer: The standard rail for EUR-denominated transfers across SEPA (EU + UK + EEA + Switzerland + a few others). Settles in 1-2 business days. Free or low-fee.
• SEPA Instant: Same scope, settles in under 10 seconds. 24/7. Now mandatory for all SEPA-connected banks (EU regulation took effect 2024). Free at most banks.
• Target Instant Payment Settlement (TIPS): ECB-operated infrastructure under the hood for SEPA Instant. Banks plug in.

When to use what: SEPA Instant for any EUR-denominated transfer within the EU. Now the default at almost every Eurozone bank. SEPA Credit Transfer if your bank doesn't yet support Instant (rare).

• Singapore PayNow / FAST: Both instant, 24/7, free. PayNow uses NRIC / phone number lookup; FAST uses bank-account-number.
• India UPI: Instant, 24/7, free. ~10 billion transactions per month. Uses VPA (virtual payment address like 'name@hdfc') for routing.
• Australia PayID / NPP: Instant, 24/7, free. PayID uses email/phone lookup like PayNow.
• Japan Zengin: Settles same-day during banking hours. Slower than other Asian rails; Japan has been slow to modernise.
• Korea Han-banking: Real-time domestic rail.
• China UnionPay / WeChat Pay / Alipay: Multiple rails coexist; UnionPay is the bank-rail; WeChat/Alipay are wallet-based.
• Philippines InstaPay / PESONet: InstaPay for amounts <₱50k, real-time. PESONet for larger amounts, batched.
• Thailand PromptPay: Instant rail, similar to PayNow/UPI. Phone number lookup.

• Brazil Pix: Launched 2020, became the dominant payment method within 18 months. Instant, 24/7, free. Uses email/phone/CPF for routing. Even cash payments are being replaced by Pix.
• Mexico SPEI: Banxico's instant rail. Settles in under 30 seconds. Free or low-fee.
• Argentina CBU/CVU: Domestic transfer rails; instant within banks, slower across.
• Colombia: Transfiya/Daviplata/Nequi: Multiple competing instant rails.

• Kenya M-Pesa: Mobile-money rail, not a bank rail per se. 30M+ users. Instant. The dominant payment method.
• Nigeria NIBSS Instant Payment (NIP): Bank rail, instant, free.
• South Africa PayShap: New instant rail launched 2023. Growing.
• Pan-African PAPSS: Pan-African Payment and Settlement System, designed to enable intra-African trade payments without going through USD correspondent banking. Launched 2022, scaling slowly.

True international rails are limited:

• SWIFT: Messaging network connecting banks worldwide. See the SWIFT guide for detail. Slow (1-5 days) and expensive (correspondent fees).
• SEPA Cross-Border (SCT/SCT Inst): Within the SEPA zone, EUR-denominated, instant or 1-2 day. Free or low-fee.
• Wise's matched-settlement network: Not a public rail, but the dominant fintech approach. Uses local rails on both ends with internal cross-border settlement.
• RippleNet: Distributed-ledger-based cross-border rail. Some adoption among smaller banks but limited compared to SWIFT.
• Project Nexus: BIS-backed effort to interconnect Asian instant rails (UPI, PayNow, etc.) for cross-border use. In pilot.

Different rails offer different fraud protection. Critical to understand before sending:

• Most reversible: Credit card payments. Strong chargeback rights (60-120 days).
• Somewhat reversible: ACH (60-day reversal window in US), SEPA (8 weeks).
• Hard to reverse: Faster Payments, RTP, SEPA Instant, UPI. Authorised Push Payment fraud is a major concern; once sent, the recipient must voluntarily return funds or your bank has limited remedies.
• Almost irreversible: SWIFT wires, Fedwire, CHAPS. Once sent, retrieval depends on beneficiary-bank cooperation.
• Completely irreversible: Cash and most cryptocurrency transfers.

Practical implication: Use credit cards for unfamiliar merchants where possible. Use bank rails (instant or otherwise) only when you trust the recipient. For large transfers to people you've never met in person, treat it like cash and verify everything twice.

• Domestic, routine, small: Whatever's free and instant in your country (ACH/RTP, FPS, SEPA Instant, UPI, PayNow).
• Domestic, urgent or large: Same instant rail, or wire if amount > $25k for paper trail.
• International, small to medium: Use a fintech (Wise, Remitly). Don't use SWIFT directly.
• International, very large (>$100k): Bank wire via SWIFT — better deposit insurance and audit trail at this scale.
• Within Eurozone: SEPA Instant. Always free, always fast.
• To unfamiliar recipient: Use a card, escrow service, or fintech with dispute support — never an instant bank rail.