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eOffer/eMod is a tool to submit Contract Offers and Contract Modification requests to GSA Federal Acquisition Service online.

Contract Offers

Prepare, Submit, or Update an eOffer

Before you begin...

Contract Modifications

Prepare, Submit, and Correct a Modification Request

Before you begin...

FAS Sales Reporting

Report Sales Data

Attention Current MAS Contractors!

All GSA Advantage catalog files must be migrated to MAS by March 31, 2021. Take the steps outlined in the SIP/EDI Catalog Update Guide to avoid removal of your catalog and ensure there is no disruption to your access to eTools. Check your file status now!


You are required to have a digital certificate for access into the eOffer/eMod applications, to authenticate you against the authorized negotiators list for your offer/modification, and to sign the final contract/modification documents electronically. To obtain a digital certificate, please click on the link under the "About eOffer" section below titled (Digital Certificates). You will see links for the two providers authorized to sell the Business Representative Identity Certificates.

Please be aware, that it will take between 7 and 14 days for a digital certificate to be issued after you have notarized your paperwork and submitted it to the company and that digital certificates must be updated every two (2) years. It is imperative that you as contractors keep your digital certificates current. An expired digital certificate will delay the ability to submit an electronic offer or modification.

Furthermore, please ensure that you back up your certificate. Check the eOffer user guide under the "Contractor Assistance and Training" section to find the procedures for backing up your certificate. By backing up your certificate, if something happens to your computer, you will have a copy to import on your new computer.

Also remember you must add your name to the "Authorized Negotiators" list EXACTLY as it appears on your digital certificate. If the names DO NOT match EXACTLY you WILL NOT be able to access the eOffer/eMod applications.

You may now use your DOD ECA certificates to access the eOffer homepage. Select the Digital Certificate section below for additional details.

eOffer/eMod was recently enhanced to capture "Product" data elements in a formatted manner. The Formatted Products Tool (FPT) is a process that captures all line items in a formatted template, sends those line items through a standardization process, and allows the user to send their product and catalog data directly to GSA Advantage upon award.