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

Before You Begin - eMod Checklist


  1. Do you know your UEI (SAM) number and contract number?
  2. Are you an Authorized Negotiator on the contract?
  3. MAS Modification Guidance

1. Do you know your UEI (SAM) number and contract number?

You must know your Unique Entity ID (SAM) number and contract number when you access the system. Your UEI (SAM) is viewable in SAM.gov. Remember, you must be signed in to your SAM.gov account to view entity records. To learn how to view your UEI (SAM) go to this help article.

As of April 2022, all users will only be able to access eMod using their UEI (SAM) number.

2. Are you an Authorized Negotiator on the contract?

You must be listed in the contract as an Authorized Negotiator.

If you are not listed, you may contact your contracting officer or have someone from your company that already has access to eMod add you to the negotiators list.

3. MAS Modification Guidance

Please visit GSA.gov/MASModGuide to download a copy of the MAS Modification Guidance and required templates.