Nacha Return Rate Thresholds: 0.5%, 3% and 15% Explained

Nacha sets three return rate levels for the ACH debits a business originates: 0.5% for unauthorized returns, 3.0% for administrative returns and 15.0% for all returns, each measured over the preceding 60 days or two calendar months. Going over the unauthorized level can lead to Nacha rules enforcement through your bank; going over the other two starts an inquiry. This guide lists the codes in each family, shows the calculation, and works an example for an online store.

What are the three levels?#

From Nacha's ACH Network Risk and Enforcement Topics (opens in a new tab) rule (effective 18 September 2015) and its calculation guides (opens in a new tab), checked 24 October 2026:

The 2015 rule lowered the unauthorized level from 1.0% to 0.5%. R11 joined the unauthorized family on 1 April 2020, when Nacha repurposed it for "Customer Advises Entry Not in Accordance with the Terms of the Authorization" (Nacha (opens in a new tab)). Nacha notes that "a return rate level above 3.0 percent will not automatically be considered a Rules violation"; the administrative and overall levels trigger an inquiry.

What do the common codes mean?#

How is a rate calculated?#

Nacha's guides allow two methods for the preceding 60 days or two calendar months:

1. Returns ÷ debits originated: debit returns received in the period, divided by debit entries originated in the same period.
2. Returns ÷ debits in the original files: debit returns in the period, divided by the debit entries contained in the files in which the original forward entries were sent.

Only debit entries count; credits such as refunds or payouts do not. Ask your bank which method it uses.

A worked example#

An online store took 400 ACH debits in the last 60 days and received these returns in the same 60 days: six R01, one R02, one R03, one R04 and one R10.

One more unauthorized return in the window takes the store to 0.5%, right at the level; a third takes it over. Small stores feel this most: at 200 debits, a single unauthorized return is already 0.5%.

How do I keep returns down?#

• Validate accounts before the first debit. Nacha has required account validation for WEB debits since 19 March 2021. Administrative returns (closed or invalid accounts) mostly disappear when the shopper connects the account through bank login.
• Make the authorization clear, with the amount, date and your business name as it will appear on the statement. Shoppers who do not recognise a debit return it as R10.
• Check balance or return risk before large debits (for example Plaid Balance or Plaid Signal).
• Watch the trend weekly, not only when your bank calls.

How ChargeWarden helps#

For stores taking ACH with BankBridge, ChargeWarden calculates these three rates over a rolling 60 days with method 1, shows returns by code, emails you when a rate reaches half and then 80% of its level, and builds a monthly evidence report. Its figures cover entries made through BankBridge on your site; your bank's official figures cover everything you originate. See ACH and Nacha monitoring.

Sources#

Checked October 24, 2026.

• Nacha: ACH Network Risk and Enforcement Topics (opens in a new tab)
• Nacha: How to calculate the unauthorized return rate (opens in a new tab)
• Nacha: How to calculate the administrative or overall return rate (opens in a new tab)
• Nacha: Differentiating Unauthorized Return Reasons (opens in a new tab)

This guide is general information, not legal or financial advice.