R66

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High-Priority Return Code

This ACH return code indicates that the company identification number used in the return entry doesn't match the company identification number from the original transaction. R66 returns occur when there's a discrepancy between the company ID in the original entry and the company ID in the company/batch header of the return transaction. This ensures consistency in business identification throughout the return process.

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Error message: "The company identification number in the return differs from the company identification number used in the original transaction."

What Causes ACH Return Code R66?

The R66 ACH return code means "Incorrect Company Identification" and indicates that the company identification number used in a return entry doesn't match the company identification number from the original transaction. This return maintains accuracy in the ACH network by catching discrepancies in business identification information during the return process.

Company identification numbers are unique identifiers assigned to businesses for ACH processing, typically found in the company/batch header of ACH files. R66 returns occur when banks process return entries and the company ID information doesn't match what was used in the original transaction, creating a data integrity issue that must be resolved to maintain proper business identification consistency.

Can You Retry R66 Payments?

You can address R66 returns by working with the receiving bank to correct the company identification number discrepancy. Since this is an error in the return process where company IDs don't match, resolution involves ensuring the return entry uses the correct company identification number that matches the original transaction. Once the company identification information is corrected, the return can be reprocessed properly.

Common Causes

Data entry errors when inputting company ID numbers in return batch headers

Using different company identification formats between original and return transactions

Manual processing errors when creating return entries with company information

System configuration issues that populate incorrect company ID information

Batch header setup mistakes that don't match original transaction company IDs

Key Information

Return timeframe: Within 5 banking days after settlement date of return entry

Error occurs in return process company identification

Requires exact company ID matching between original and return entries

Affects company/batch header information in ACH files

Resolution requires coordination with receiving bank's ACH operations

How to Respond to an R66 Code

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An R66 return requires immediate verification of company identification numbers and coordination with the receiving bank to correct the company ID discrepancy in the return entry.

When Your Customer's Payment Fails

Contact RDFI's ACH Operations
Reach out to the receiving bank's ACH operations team to report the company identification number discrepancy between the return and original transaction.
Provide Both Company IDs
Give the bank the company identification numbers from both the original entry and the return entry to help them identify the mismatch.
Request Return Reversal
Ask if the bank can reverse the incorrect return so that a new return with the correct company identification number can be initiated.
Verify Company Information
Double-check that all company identification numbers match your business records and ACH file setup before reprocessing.

Email Template

Subject: Payment Return Company ID Discrepancy - Under Investigation

Hi [Customer Name],

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We've identified a processing discrepancy related to your recent payment return where the company identification numbers don't match between the original transaction and the return entry.

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This is an administrative error in the return processing system rather than an issue with your original payment or our business information. We're working directly with the banks involved to correct the company identification discrepancy.

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We expect this to be resolved within 2-3 business days, after which the return will be reprocessed with the correct company identification information. No action is needed on your part.

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Thank you for your patience while we resolve this matter.

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[Your Company Name]

When Your Payment to Vendors Fails

An R66 return on vendor payments indicates that a return entry was processed with company identification information that doesn't match the original transaction. This requires working with banks to correct the company ID discrepancy.

Contact the receiving bank's ACH operations team to report the company identification number discrepancy
Provide both the original transaction company ID and the incorrect return entry company ID
Request that the incorrect return be reversed so a corrected return can be processed
Verify all company identification information is accurate in your ACH file setup before reprocessing to prevent future R66 returns