Same Day ACH $10 million limit from 17 September 2027 vs FedNow and RTP

Summary. Nacha's rule raising the Same Day ACH dollar limit to $10 million takes effect on 17 September 2027, 308 days from 13 November 2026. It lifts the per-payment cap from $1 million to $10 million for credits and debits, consumer and business payments, and all three same-day settlement windows at 1:00, 5:00 and 6:00 p.m. ET; IAT entries stay ineligible. Nacha had proposed 19 March 2027, moved the date to give banks time, and announced membership approval on 27 April 2026. The change puts Same Day ACH level with the instant rails: FedNow raised its limit to $10 million in November 2025, and The Clearing House lists $10 million for RTP. On network price, FedNow and RTP both charge the sending bank $0.045 per credit transfer, while a same-day FedACH item costs the sender about 5.7 cents in operator and Nacha fees, most of which passes to the receiving bank. The network cap is a ceiling, not a promise: your bank decides whether you get it. Our view: use Same Day ACH for large batch and debit flows, FedNow or RTP when money must land in seconds or outside banking hours, and Fedwire when none of them reaches the payee.

About this article. For payments engineers and treasury, payroll and product leads at US banks, processors and accounts-payable platforms. We checked every date, limit and fee on 13 November 2026 against Nacha's rule pages and fee schedule, Federal Reserve Financial Services fee schedules, processing schedule and FedNow operating circular, The Clearing House's RTP pages and price list, and Stripe's pricing pages. Fees shown are network and list prices, which change; this is not legal or banking advice, and no vendor paid for inclusion. Researched with AI assistance and reviewed by our editorial team.

What changes on 17 September 2027

The rule changes one number in the Nacha Operating Rules, everywhere Same Day ACH applies: all eligible SEC codes, credits and debits, consumer and business payments, and all three same-day settlement windows. Nacha kept debits and credits on the same limit so that a same-day reversing debit can still undo an erroneous credit of the same size.

Two exclusions carry over. International ACH Transactions (IAT) remain ineligible for Same Day ACH at any amount, and the existing limits for the ARC, BOC, POP, RCK and XCK entry types (cheque conversion and point-of-purchase entries) stay in place. If your platform sends IAT or converted-cheque entries, nothing about your routing changes on 17 September.

This is the third increase since Same Day ACH launched for credits in September 2016, according to Nacha's history and press releases.

Nacha's request for comment in the fourth quarter of 2025 drew 117 responses: 87% supported raising the limit, 81% backed $10 million specifically, 74% wanted one limit for all Same Day ACH entries and 79% judged the impact manageable. Respondents named B2B payments, payroll funding and cash concentration as the main beneficiaries. Nacha estimates that $7 trillion to $8 trillion of annual ACH value could become eligible for same-day settlement.

The rail is already large. Nacha counted 1.4 billion Same Day ACH payments worth $3.9 trillion in 2025. In the third quarter of 2026 it carried 470.4 million payments worth $1.3 trillion, up 36.7% by volume on a year earlier, and 1.3 billion payments worth more than $3.6 trillion over the first nine months.

What the rule does not do

It does not require any bank to let you send $10 million on the same day. Nacha's impact notes say originating banks (ODFIs) must decide whether to offer higher limits to their originators, may need software changes to dollar-threshold edits, and should consider reassessing some customers' credit limits. We expect many banks to offer the higher cap first to selected treasury clients, with exposure limits per company.

It does not extend processing hours either. Same Day ACH settles three times on business days, and nothing settles on weekends or federal holidays. Fedwire, the usual route above the cap, also runs on business days today; the Fed's 2027 pricing summary says it is preparing Fedwire Funds to move to six operating days in 2028 or 2029.

The other Nacha dates around it

The $10 million change sits in a busy rules calendar, and our 2027 US and UK compliance calendar places it among the year's other deadlines. Payment teams already planning a September 2027 release should check whether these rules touch the same code.

R90 splits sanctions returns from R16 and gives them their own deadline: the second banking day after the receiving bank's sanctions decision.

Three 2026 rules already in force shape how a larger same-day limit will be monitored. Fraud monitoring phase 1 took effect on 20 March 2026, alongside two new standardised Company Entry Descriptions. Phase 2 took effect on 19 June 2026, with a practical date of 22 June because of the federal holiday. From 18 September 2026, receiving banks must make non-same-day ACH credits available by 9:00 a.m. local time on the settlement date.

Same Day ACH vs FedNow vs RTP side by side

From 17 September 2027 all three account-to-account rails share a $10 million network cap. The differences that matter are timing, finality, debit support, reach and price. The table draws on Nacha, Fed and TCH pages, including the Fed's participant list and FedNow operating circular.

The biggest functional gap is debits. Same Day ACH can pull money from an account, which is why payroll funding, tax remittance and cash concentration sit in Nacha's own list of use cases. FedNow and RTP only push credits. A request for payment on either rail asks the payer to send funds; it does not let you take them.

The second gap is finality. TCH contrasts the two directly: Same Day ACH clears in batches and settles afterwards, while RTP payments clear and settle one by one with immediate finality. FedNow settlement is final once the service records the debit and credit or advises the receiving bank, whichever is earlier. That suits the payee and raises the stakes for the payer's fraud controls. Same Day ACH keeps the return and reversal framework ACH users already know. Whichever rail you use, treat a timeout as an unknown result until confirmed, as in our notes on payment failure handling under load.

The third gap is reach. Same Day ACH reaches almost every account; instant rails reach only enabled institutions. TCH reports 150 million RTP transactions worth $621 billion in the third quarter of 2026 and says RTP carried 98% of US instant payments in 2025, which is its own count.

Settlement windows and cutoffs

For same-day work the clock is the FedACH processing schedule, in force since 12 September 2022. Your bank's customer cutoffs will be earlier than these operator deadlines, often by an hour or more, so ask for the exact times in writing.

The third window is the one to plan around. A West Coast treasury team has until 1:45 p.m. Pacific to meet the operator's last same-day deadline, before any bank buffer. Under the new rule a receiving bank can see up to $10 million per entry settle at 6:00 p.m. ET, after many funding desks have closed.

Nacha tells receiving banks to study current same-day flows, check how often they end the day in a net-debit position or on a low reserve balance, and prepare for late, larger payments. It points to three tools: FedDetect Anomaly Notification, which reports unusually large same-day debit batches due to settle in the third window; the FedACH Risk RDFI Alert Service, with alerts by direction, amount, SEC code and entry count; and Fedwire, which stays open after the third window so a bank can fund a shortfall.

What each rail costs

Network fees are paid by banks, not by you. They set a floor, not your price: banks and providers add their own margin, and most banks do not publish business pricing for same-day or instant payments. The Federal Reserve Board announced its 2027 prices on 12 November 2026, with an estimated 1.4% average increase for mature services. Federal Reserve Financial Services says FedACH prices are unchanged for 2027 and FedNow has no service-specific price changes.

FedNow fees for 2027

The FedNow Service 2027 fee schedule takes effect on 1 January 2027 and keeps the 2026 per-item prices.

One 2026 line is gone. In 2026 the Fed discounted the credit transfer fee by $0.045 for up to 2,500 transfers a month, which made a bank's first 2,500 monthly sends free. The 2027 schedule replaces it with the Discount Program below.

Same Day ACH and RTP network fees

For a same-day item sent through FedACH in 2027, the sending bank pays a $0.0035 origination fee plus a $0.0010 same-day surcharge, and $10 a month per routing number to participate in same-day origination. FedACH also collects two Nacha charges: the Same Day Entry Fee of $0.052 per item, which is passed to the receiving bank as a matching credit, and the network administration fee. Nacha's 2027 schedule sets that fee at $0.000185 per entry plus $408 a year. A same-day ACH credit therefore costs the sending bank about 5.7 cents in network and operator fees, slightly more than an instant payment, but the receiving bank gets most of it back.

TCH publishes one RTP price list for all participants, with no volume discounts, commitments or monthly minimums. Effective 1 January 2025, it charges $0.045 per credit transfer sent, $0.01 per request for payment and $0.01 per remittance advice, nothing to receive, and a $0.10 incentive fee that the bank sending a request for payment owes to the bank that pays it. The per-item price matches FedNow's.

What a platform pays: one published example

Stripe is one of few providers that publish per-rail prices for US business payouts, under Global Payouts. We read these list prices on 13 November 2026 from an archived copy of Stripe's US pricing page dated 7 November 2026 and from Stripe's payout pricing documentation; volume pricing is negotiated.

Stripe also includes the first 50 domestic payouts a month with Treasury. For the collection side, see our Stripe, Adyen and Checkout.com fee comparison.

The FedNow 2027 Discount Program

The Fed's 2027 schedule adds one-time statement credits for banks that switch on FedNow or grow their use of it.

The conditions matter more than the headline. A send credit must be opted into and is paid in two halves: 50% on opt-in and 50% once the bank meets the volume test for six qualifying months, counted within the calendar year or the six months after opt-in, whichever is longer. If the bank falls short, the first half can be reversed. Receive credits apply automatically unless the bank opts out, but require full-service use of the Exception Resolution Service, a FedPayments Insights subscription and either Premier FedDetect Anomaly Notification or an API-based pre-transaction fraud tool, all kept for at least six months. No credit can exceed the total fees the institution paid in the prior 12 months.

Choose the rail: a decision table

Worked example: a US accounts-payable platform

Take a hypothetical US accounts-payable SaaS company that pays suppliers for 400 mid-market customers through Stripe Global Payouts. We assume Stripe lets it send same-day ACH payouts up to the new network cap; we found no Stripe page stating its own same-day maximum. Each month it sends:

• 2,600 routine payments averaging $8,000 ($20.8 million), sent next-day ACH.

• 380 urgent payments averaging $60,000 ($22.8 million), sent same-day ACH.

• 20 large payments averaging $2.5 million ($50 million), sent by Fedwire today because they exceed the $1 million same-day cap.

Total: 3,000 payouts and $93.6 million a month. We ignore the 50 included payouts to keep the arithmetic conservative.

Moving the 20 large payments to Same Day ACH saves $480 a month ($2,180 minus $1,700), or $5,760 a year. That is real but small. The larger lesson is the 0.05% platform fee: on high-value B2B flows a value-based fee dwarfs any per-item saving from picking a cheaper rail. A platform moving close to $100 million a month should price a direct bank relationship, where per-item pricing is usual, against a provider's percentage fee.

Two effects are harder to price. Same Day ACH keeps the 20 large payments inside the same file, approval and reconciliation flow as the other 2,980. And moving the urgent tier to RTP at $2.50 would add $570 a month (380 × $1.50), worth it only where weekend or seconds-level delivery matters.

The bank view looks different. A community bank sending 5,000 FedNow credit transfers a month pays the Fed $225 at $0.045 each, or $2,700 a year, with the participation fee waived. At 5,000 sends it passes every send volume test, and its FedACH Receipt Discount standing sets the ceiling at $20,000, $40,000 or $80,000. The credit is still capped at the total fees the bank paid in the prior 12 months. The published terms do not limit that to FedNow fees, so a bank that also pays FedACH and Fedwire fees may have more headroom than its FedNow bill suggests; ask the Fed how the cap is counted.

What to change before 17 September 2027

1. Find every hard-coded $1,000,000. Search API validation, file builders, approval workflows, front-end forms and routing rules.

1. Ask your ODFI for its plan. Get in writing whether it will offer $10 million, from what date, for which SEC codes, and with what daily exposure limit per originator.

1. Re-tune fraud and approval thresholds. A same-day $8 million debit is a new kind of event; tie it into the fraud monitoring Nacha's 2026 rules already require.

1. Revisit routing logic. Decide which payments over $1 million move from Fedwire or next-day ACH to Same Day ACH, and which stay on wire.

1. Model the 6:00 p.m. ET exposure. Treasury forecasts should assume larger same-day debits and credits can settle in the third window.

1. Receiving side: set alerts. Configure large-value same-day alerts before the effective date.

1. Update reconciliation. Large items move from Fedwire references to ACH trace numbers; matching rules need both.

1. Bundle the file changes. The 1 January 2027 accepted-characters rule and the 17 March 2028 R90 code touch the same file and return-handling code.

1. Test with your bank. Pilot a few high-value entries in each window before turning the limit on for all clients.

1. Tell customers. AP, payroll and treasury users need the new cap, your bank's cutoffs and when to use instant rails instead.

Teams that also run European payouts face a parallel build; see our guide to SEPA Instant obligations for EU payment institutions.

How eCorpIT can help

eCorpIT is a Gurugram-based technology organisation, founded in 2021, assessed at CMMI Level 5 and MSME certified, with senior-led engineering teams working across AWS, Microsoft and Google platforms. Our application development services team can find where your $1 million limit lives in code, rework payout routing, fraud thresholds and reconciliation, and test against your bank's same-day windows. Talk to us at /contact-us/.

Last updated: 13 November 2026.

References

1. Increasing the Same Day ACH Dollar Limit to $10 Million — Nacha

1. Same Day ACH Per Payment Limit to Increase to $10 Million, 27 April 2026 — Nacha

1. FedNow Service will raise transaction limit to $10 million, 9 September 2025 — Federal Reserve Financial Services

1. RTP network frequently asked questions — The Clearing House

1. FedNow Service 2027 Fee Schedule — Federal Reserve Financial Services

1. RTP Participant Fee Schedule, effective 1 January 2025 (PDF) — The Clearing House

1. FedACH Services 2027 Fee Schedule — Federal Reserve Financial Services

1. Same Day ACH — Nacha

1. Same Day ACH Expansion to $1 Million Begins Today, 18 March 2022 — Nacha

1. Same Day ACH Growth Propels the ACH Network Forward in Third Quarter of 2026, 20 October 2026 — Nacha

1. 2027 Pricing and Product Changes Summary — Federal Reserve Financial Services

1. Nacha Operating Rules: New Rules — Nacha

1. New Return Reason Code for Sanctions Compliance Obligations — Nacha

1. FedNow Service Participants and Service Providers, list as of 9 November 2026 — Federal Reserve Financial Services

1. Operating Circular No. 8: Funds Transfers Through the FedNow Service, effective 1 April 2026 (PDF) — Federal Reserve Banks

1. Real Time Payments — The Clearing House

1. FedACH Processing Schedule — Federal Reserve Financial Services

1. Federal Reserve Board announces pricing, effective January 1, 2027, for payment services, 12 November 2026 — Board of Governors of the Federal Reserve System

1. FedNow Service 2026 Fee Schedule — Federal Reserve Financial Services

1. 2027 Schedule of Fees (PDF) — Nacha

1. Pricing and fees, archived 7 November 2026 — Stripe, via Internet Archive

1. Global Payouts: supplemental pricing information — Stripe Docs

1. FedNow Service 2027 Discount Program — Federal Reserve Financial Services