How to File a GAO Bid Protest: Deadlines, Grounds, and What to Expect

A bid protest is the formal way to challenge how a federal agency ran a procurement. File one at the Government Accountability Office (GAO) and a strict clock starts: you generally have 10 days to act, GAO must decide within 100 days, and filing on time can freeze the contract while the review runs.

Check first: before you protest a lost award, make sure you were eligible to win it in the first place. Run our free 60-second eligibility checker to confirm your set-aside and certification standing — a quick gut check that can save you a $350 filing fee.

You bid on a federal contract, you did the work, and the award went to someone else — maybe someone who, as far as you can tell, shouldn't have won. A bid protest is the formal way to ask whether the agency followed its own rules. This guide walks through who can protest, the deadlines that make or break your case, what counts as a real ground, how to file through GAO's electronic system, and what the process actually looks like from the inside.

What a bid protest actually is — and the three places you can file one

A bid protest is a written objection to the terms of a solicitation or to the award (or proposed award) of a federal contract. It is not a lawsuit for damages and it is not an appeal of your technical score for its own sake. It asks a narrower question: did the agency follow procurement law, the terms of its own solicitation, and a reasonable, documented evaluation?

There are three forums where a disappointed offeror can take that question. The first is an agency-level protest, filed directly with the contracting agency — fastest and cheapest, but you are asking the same office that made the decision to reverse itself. The second is GAO, an independent legislative-branch body that hears protests under the Competition in Contracting Act. The third is the U.S. Court of Federal Claims, a formal court with broader review and no fixed decision deadline. Most small businesses that protest start at GAO, because the rules are published, the timeline is predictable, and the filing cost is low relative to litigation. This guide focuses on the GAO route.

Who can file: the "interested party" test

You cannot protest a contract just because you dislike the outcome. GAO's regulations limit protests to an interested party, which 4 CFR 21.0(a)(1) defines as "an actual or prospective bidder or offeror whose direct economic interest would be affected by the award of a contract or by the failure to award a contract."

In plain terms, two things have to be true. You had to be in the competition — you submitted a bid or proposal, or you were shut out of submitting one by the very solicitation term you are challenging. And you have to be in line to benefit if you win: if there were several higher-rated offerors ahead of you and your protest only knocks out the awardee, you may not be "next in line," and GAO can dismiss the protest for lack of a direct economic interest. Before you invest in a protest, be honest about where you actually stood in the evaluation.

The deadlines that decide everything

Timeliness is where most protests die. GAO applies its deadlines strictly, and a late protest is dismissed no matter how strong the underlying argument.

There are two basic rules in 4 CFR 21.2. If your complaint is about something apparent on the face of the solicitation — an ambiguous spec, an unduly restrictive requirement, a missing evaluation factor — you must file before bid opening or the time set for receipt of initial proposals (21.2(a)(1)). You cannot bid, lose, and then complain about a solicitation term you could have challenged up front. For every other protest, including challenges to the evaluation or the award decision, you must file "not later than 10 days after the basis of protest is known or should have been known" (21.2(a)(2)).

Layered on top is a separate, often tighter clock: the automatic suspension. Under the Competition in Contracting Act (31 U.S.C. 3553), once the agency receives notice of a protest from GAO before award, "a contract may not be awarded" while the protest is pending (subsection (c)(1)). After award, the contracting officer "may not authorize performance of the contract to begin" — and must direct the awardee to stop — but only if GAO's notice arrives during the window in subsection (d)(4): the later of 10 days after the date of contract award, or 5 days after the date of a requested-and-required debriefing. Miss that window and your protest can still be timely under the 10-day rule, yet the contract keeps moving while GAO reviews it.

That distinction matters enormously in practice. If a debriefing is available, request it promptly and in writing, because a timely, required debriefing both sharpens your grounds and can extend the clock for the stay. If you are tracking several federal opportunities at once, a single missed date can cost you the suspension, which is why many firms put award dates and debriefing windows on a shared deadline calendar rather than trusting memory.

What counts as a valid ground

GAO reviews whether an agency acted reasonably and consistently with the solicitation and applicable law — it does not substitute its judgment for the agency's or re-score proposals. Grounds that tend to hold up share a common theme: the agency departed from its own stated rules.

Common viable grounds include an evaluation that ignored or misapplied the stated evaluation factors; unequal treatment, where the agency credited the awardee for something it penalized you for; a flawed or undocumented best-value tradeoff that does not explain why a higher-priced offer was worth it; an unreasonable past-performance or technical evaluation; an improper cost or price analysis; or a conflict of interest the agency failed to address. "I should have won" is not a ground. "The solicitation said X would be evaluated, and the record shows the agency evaluated Y" is.

A clean reading of the solicitation is usually where strong grounds come from, which is why it pays to dissect the evaluation section before you ever bid — our guide on reading a federal solicitation section by section breaks down where those terms live. And because weak past-performance records are a frequent (and often fair) reason offerors lose, firms early in their federal journey may get more mileage from building a past-performance record than from protesting.

How to file through EPDS

GAO protests are filed through the Electronic Protest Docketing System (EPDS), GAO's online portal. Electronic filing through EPDS has been mandatory since May 1, 2018, and the same rule established a $350 filing fee per protest (Federal Register 83 FR 13825; 4 CFR 21.1(b)). You register for an account, create a docket, upload your protest, and pay the fee online.

The protest filing itself must identify you and the agency, name the solicitation or contract number, set out a detailed statement of the legal and factual grounds, and state the relief you are requesting. Vague, conclusory protests ("the evaluation was unfair") get dismissed; GAO expects specific allegations tied to the record. Once you file, GAO notifies the agency, and if your protest is within the stay window, the agency's award or performance suspension kicks in. The agency then produces an agency report — the contract file, the evaluation record, and a legal response — and you get a chance to file comments rebutting it, typically within 10 days of receiving the report. Those comments are where most protests are won or lost, because that is your first look at the actual record behind the decision.

What to expect: the 100-day clock, the express option, and remedies

The single most predictable thing about GAO is its deadline to decide. Under 4 CFR 21.9(a), "GAO shall issue a decision on a protest within 100 days after it is filed." For simpler matters, either party can request the express option, under which GAO aims to decide within 65 days (21.9(b)); the request is due no later than 5 days after the protest is filed, and GAO adopts it at its discretion only in cases suitable for fast resolution.

Not every protest runs the full 100 days. Many are resolved earlier through corrective action, where the agency — once it sees the protest grounds or the comments — voluntarily agrees to reevaluate, amend the solicitation, or take another look, and GAO dismisses the protest as academic. That is a common and often good outcome: you may not get a formal "sustain," but you can get the agency back to a fair evaluation, which is usually the real goal.

If GAO issues a decision, it will sustain (agree with you) or deny the protest. When GAO sustains a protest, it recommends a remedy — which can include reevaluating proposals, amending and reopening the competition, terminating and reawarding the contract, or reimbursing certain protest costs — but GAO issues recommendations, and it cannot by itself cancel a contract or order an agency to give you the award. Agencies almost always follow GAO's recommendations, but the remedy is corrective, not a guaranteed win for you.

Should you protest? A clear-eyed look before you file

A protest is a tool, not a reflex. Before you file, weigh a few things honestly. Do you meet the interested-party test — are you actually in line to benefit? Can you point to a specific departure from the solicitation or the law, not just a result you disliked? Are you inside the deadline, and if a stay matters to you, inside the tighter stay window? And can you carry the cost and the relationship risk, since protests can strain a customer relationship and, for the grounds that turn on legal interpretation, often warrant a government-contracts attorney?

Sometimes the better move is not a protest at all but a sharper bid next time — a cleaner compliance matrix, stronger past performance, a tighter price narrative. If you want a second set of eyes on why your proposals keep landing in second place, our bid-response support and a proposal audit are built for exactly that diagnosis, and you can see what that costs on our pricing page. And if you are rebuilding your approach to the next opportunity, knowing how to respond to a sources-sought notice can put you in front of the requirement before the solicitation is even written.

A well-timed, well-grounded protest can reset an unfair competition; a late or speculative one just costs you money and goodwill. Know which one you have before you open EPDS.

This article is general information about the federal bid-protest process, not legal advice. Bid protests involve strict deadlines and legal standards, and the right strategy depends on your specific facts — consult a qualified government-contracts attorney before filing. Rules, fees, and thresholds change; verify current requirements with GAO and the governing regulations before you act. See our disclosures for full disclaimers.