GSA Industrial Funding Fee (IFF) Lockbox Closure on January 12, 2024

Dec 4, 2023

GSA’s IFF Lockbox 979017 will close on January 12, 2024. Paper IFF checks should not be sent to the IFF Lockbox 979017 after the closure date. This is part of the U.S. Treasury plan to reduce general lockbox volume by the end of 2024. You are encouraged to utilize one of the many electronic IFF payment options available.

Grace Period: There will be a 90-day grace period after January 12, 2024. During the grace period, the U.S. Bank will forward checks from the IFF Lockbox to the Miscellaneous Lockbox. After this grace period ends, the U.S. Bank will return paper IFF checks received at the closed IFF Lockbox to the contractor.

Frequently asked questions are listed below. If you have additional questions regarding this change, please contact us at

Frequently Asked Questions

Where should I send paper IFF checks after January 12, 2024?  

After January 12, 2024, you should send paper IFF checks to the GSA Miscellaneous Lockbox 979009 at the following address:

Regular US Post Office Mail:
General Services Administration
Miscellaneous Receipts
PO Box 979009
St. Louis, MO 63197-9009

Overnight Mail:
GSA Lockbox 979009
Government Lockbox
1005 Convention Plaza, SL-MO-C2GL
Saint Louis, MO 63101-1229
PH: (314) 425-1818

What types of payments can be sent to the GSA Miscellaneous Lockbox 979009?
After January 12, 2024, the GSA Miscellaneous Lockbox 979009 will process IFF payments, overcharge payments, and other miscellaneous payments.

Payment Identification Needed:

Since different types of payments will be sent to the Miscellaneous Lockbox, it’s important that you clearly identify what the payment is for so our finance team can apply the payment to your contract accurately.

Paper checks should be made payable to the U.S. General Services Administration. Please list your MAS Contract Number on the check with a note stating the purpose of the payment.

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