Same Day ACH Cap Jumps to $10M, Reshaping B2B Payments

The Same Day ACH per-payment ceiling will climb to $10 million in September 2027, a tenfold increase that opens the U.S. payment rails to large-ticket business-to-business flows long routed through wires. The move, approved by Nacha membership and announced April 27 at the Smarter Faster Payments 2026 conference in San Diego, applies exclusively to domestic ACH transactions between U.S. bank and credit union accounts. It marks the third upward revision in the program's decade-long history and signals how aggressively the ACH Network is now competing for high-value treasury traffic within the United States.

What changes for finance teams in September 2027?

Effective September 17, 2027, a single Same Day ACH payment can carry up to $10 million, up from the current $1 million ceiling set in March 2022. The original cap, when the service launched in 2016, was $25,000. It rose to $100,000 in 2020 before the 2022 jump to $1 million.

Each step has tracked a clear pattern: every time Nacha raised the ceiling, transaction volumes accelerated. The latest data reflects that. In the first quarter of 2026, the network processed 403 million Same Day ACH payments worth $1.1 trillion, up 23.6% in volume and 22.1% in value year over year. That followed full-year 2025 totals of 1.4 billion payments and $3.9 trillion, growth of 16.7% and 21.4% respectively over 2024.

Which use cases benefit most?

Nacha expects the expanded limit to reshape five categories in particular: invoice and tax payments, insurance claim disbursements, payroll funding, merchant settlement, and cash concentration. Each of these has historically bumped against the $1 million ceiling, forcing corporates to either split payments or default to Fedwire or The Clearing House's CHIPS for higher-value transfers.

Cash concentration is the most immediate beneficiary. Treasury teams sweeping funds between subsidiary accounts and a parent operating account routinely move sums well above $1 million on tight intraday deadlines. A $10 million ACH limit eliminates the need to fragment those sweeps or pay wire fees, which typically run 10 to 20 times higher than ACH per-transaction costs.

Payroll funding is another pressure point. Mid-market employers funding biweekly runs frequently exceed $1 million per file, and the higher limit removes a recurring operational headache for payroll providers and the banks supporting them.

How does this position ACH against RTP and FedNow?

The timing matters. The Clearing House's RTP network raised its transaction limit to $10 million in February 2025, and the Federal Reserve's FedNow Service currently caps transactions at $1 million but allows participating institutions to opt into higher limits. By matching RTP's $10 million ceiling, Same Day ACH preserves its competitive position for institutions and corporates that have not yet integrated with instant rails.

The distinction is meaningful. ACH remains a batched, deferred-net-settlement system, not a real-time one. But for treasury and accounts-payable functions where same-day finality is sufficient, ACH offers near-universal reach across roughly 10,000 U.S. financial institutions, returns capability for error correction, and substantially lower per-transaction economics than wires or instant payment alternatives.

What does the broader ACH growth picture look like?

The ACH Network as a whole processed 35.2 billion payments worth $93 trillion in 2025, according to Nacha. Same Day ACH now represents roughly 4% of that volume but is growing at more than three times the rate of standard ACH, indicating a structural shift in how originators are routing time-sensitive payments.

Same Day ACH will mark its tenth anniversary in September 2026, one year before the new limit takes effect, giving banks, processors, and corporate treasury platforms a roughly 17-month runway to update internal limits, fraud controls, and customer-facing interfaces.

Why This Matters to FinanceX Readers

The $10 million Same Day ACH limit is more than a technical adjustment, it is a direct challenge to the wire transfer's traditional dominance over high-value corporate flows.

For CFOs, treasurers, and bank product managers, the change reopens cost-benefit calculations on payment routing that have been settled for years. Expect renewed pressure on wire fee structures and a fresh wave of treasury management system updates as the September 2027 effective date approaches.

By Koen Vanderhoydonk - FinanceX Magazine