What is the challenge to solicitation terms must be filed for GAO protest?

before the time set for receipt of initial proposals, per GAO bid protests This figure was read from that source on 2026-08-04; thresholds are revised, so check the citation before relying on it in a bid.

After you bid

What is a GAO bid protest?

A GAO protest is a bid protest filed with the Government Accountability Office, which must decide it within 100 calendar days, and which has strict filing deadlines — solicitation challenges before proposals are due, other grounds within 10 days of when you knew or should have known of them.

Also written as: GAO bid protest, protest deadline GAO, automatic stay.

GAO states the deadlines plainly. A challenge to the terms of a solicitation must be filed before the time set for receipt of initial proposals. Every other ground must be filed within 10 days of when the protester knew or should have known of the basis of protest, with a special exception tied to a required debriefing. Days are calendar days, and a deadline falling on a weekend, federal holiday or GAO closure moves to the next business day.

GAO must decide a protest within 100 calendar days. That is why it is the main forum: it is fast by the standards of any comparable dispute process.

The suspension of performance is a separate clock and the one people miss. Under FAR 33.104(c)(1), the agency must suspend performance or terminate the award when it receives notice of a GAO protest filed within 10 days after contract award, or within 5 days after the date offered for a required debriefing, whichever is later. Miss that window and your protest can be perfectly timely while the work proceeds anyway.

What this means when you bid

Two clocks, not one: timeliness at GAO, and the shorter window that suspends performance. Calendar both from the award notice.

GAO protest: the published figures

Each figure below was read from the regulation cited beside it on 2026-08-04. Thresholds are adjusted for inflation and changed by statute — follow the citation and confirm the figure in effect on your solicitation's date before you rely on it.

Challenge to solicitation terms must be filed: before the time set for receipt of initial proposals
Other protest grounds must be filed within: 10 calendar days of knowing, or having reason to know, the basis of protest
GAO decision deadline: 100 calendar days
Protest that suspends performance must be filed within: 10 days after award, or 5 days after the offered required debriefing date, whichever is later

GAO protest compared with the terms it gets confused with

GAO protest vs Debriefing

The required-debriefing date is what can extend the suspension window past the 10-days-after-award date — which is why the debriefing should always be requested.

What Debriefingmeans →

Where this definition comes from

Federal contracting is one of the few fields where the authoritative answer is free, public and one click away. These are the sources this page is built from — go and read them.

GAO bid protests→
GAO's own description of its protest process.
4 CFR 21→
GAO bid protest regulations.
FAR 33.104→
Protests to GAO.

This page explains a term in plain English and cites the authority it comes from. It is not legal advice, and the regulation governs where this page and the regulation differ.

Free tools for government contractors

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GAO protest— common questions

What is a GAO bid protest?: A GAO protest is a bid protest filed with the Government Accountability Office, which must decide it within 100 calendar days, and which has strict filing deadlines — solicitation challenges before proposals are due, other grounds within 10 days of when you knew or should have known of them.
What is the difference between GAO protest and Debriefing?: The required-debriefing date is what can extend the suspension window past the 10-days-after-award date — which is why the debriefing should always be requested.
What is the challenge to solicitation terms must be filed for GAO protest?: before the time set for receipt of initial proposals, per GAO bid protests This figure was read from that source on 2026-08-04; thresholds are revised, so check the citation before relying on it in a bid.
Why does a GAO protest matter when you are bidding?: Two clocks, not one: timeliness at GAO, and the shorter window that suspends performance. Calendar both from the award notice.