Green Book
Guide to Federal ACH Payments
The Green Book is a comprehensive guide for financial institutions that receive ACH payments from and send payments (i.e. collections) to the federal government.
Most federal payments are made through ACH with very few exceptions
Federal government ACH transactions continue to be subject to the same rules as private industry ACH payments.
The Green Book is designed to deal primarily with exceptions or issues unique to Federal government operations.
The Green Book contains federal agency contact information and website addresses where appropriate.
To make the Green Book easier to navigate, download, and print, chapters are available in PDF format only.
We periodically review and update the Green Book.
Quick Links
Updates
NOTICE: Changes in Social Security Direct Deposit Enrollments (pdf) 
NOTICE: Changes to Social Security EFT Cycled Payments (pdf)
NOTICE: Updated Changes to Social Security EFT Cycled Payments (pdf)
Direct Deposit of IRS Tax Refunds Resource File (pdf) 
Garnishment Final Rule Frequently Asked Questions
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Related Resources
- ACH Regulation (31 CFR 210)
- Electronic Federal Tax Payment System (EFTPS)
- Electronic Transfer Account (ETA)
- Electronic Funds Transfer (EFT)
- Defense Finance & Accounting Service (DFAS)
- Federal Reserve
- NACHA
Tax Questions? Call the IRS at 1 (800) 829-1040
or visit www.irs.gov
