NACHA

What NACHA is

Nacha is the organization that develops and maintains the Operating Rules for the US ACH Network. The organization was originally called the National Automated Clearing House Association, but it now uses the name Nacha. The ACH Network is the system that moves electronic payments between US bank accounts. Nacha sets its rules; it does not process your individual payments.

If your business accepts an ACH debit, such as an online bill payment, or sends a credit, such as payroll, your payment follows those rules. An ACH file can group multiple payments into one batch, rather than sending each payment separately. The network connects thousands of financial institutions, so a standard rulebook helps keep payments and exceptions consistent.

Nacha sets the ACH rulebook, but your bank or payment provider sets your ACH processing charges.

How Nacha rules affect your business

The rules cover how you authorize bank-account debits, send payment information, handle returns and manage fraud risk. For a recurring customer debit, you need authorization and must give required notice when the amount or date changes. If a customer says a debit was unauthorized, a return can reach you up to 60 calendar days after settlement. Most other ACH returns come back within two banking days.

As of 2026, Nacha's return-rate thresholds are 0.5% for unauthorized returns, 3% for administrative returns and 15% overall. These thresholds make authorization errors and bad account details a business risk, not just a bookkeeping nuisance. Track return reasons and fix recurring data or consent problems before they push your return activity toward a threshold.

What it means for your costs

Nacha does not set a standard per-payment fee for your business. Your bank or payment provider sets any ACH processing charges, so compare those charges separately from card-processing fees. ACH batching can reduce the work of handling payments one by one, but the research does not establish a specific dollar saving or standard merchant rate.

Speed also affects your payment operations. As of 2026, Same Day ACH has a $1 million limit per payment. That limit is scheduled to rise to $10 million on September 17, 2027. Most small businesses will care more about authorization, return handling and their provider's ACH charges than this transaction ceiling.

Recent rules to pay attention to

As of 2026, Nacha requires risk-based fraud monitoring across ACH payment types. Phase 1 took effect March 20, 2026, for businesses that originated at least 6 million ACH entries in 2023. Phase 2 took effect June 22, 2026, for other covered businesses. The requirements call for identifying transactions initiated because of fraud and reviewing fraud-monitoring processes annually.

A separate data-field rule took effect March 20, 2026. Payroll credits for wages and similar compensation must use the Company Entry Description `PAYROLL`; consumer online purchase debits using SEC code WEB or TEL must use `PURCHASE`. If you originate either payment type, ask your ACH operations team to confirm the fields are being sent correctly. Nacha rules apply to ACH, not card transactions.

What you can actually change

1. 01
   Check authorizations. Keep records showing the customer approved each debit, whether it is one-time or recurring. Give required notice when a recurring debit's amount or date changes.
2. 02
   Review return data. Track unauthorized, administrative and total ACH returns against the 2026 thresholds of 0.5%, 3% and 15%. Investigate repeat errors before they become a pattern.
3. 03
   Confirm required fields. If you send payroll credits or consumer online purchase debits, confirm your files use `PAYROLL` or `PURCHASE` as required since March 20, 2026.
4. 04
   Separate ACH charges. Review your bank or payment provider's ACH fees separately from card fees. Nacha does not publish a standard merchant per-payment fee.

Frequently asked questions