Losing a federal award you believe was wrongly decided puts you on a clock that starts running before most companies realize it. The Government Accountability Office received 1,688 protest filings in fiscal 2025, and the single most common way protesters lose is not on the merits — it is by missing a deadline measured in days. This guide walks through who can protest, the clocks that matter, what filing actually involves, and what the latest GAO numbers say about your real odds.
Who Can Protest
GAO hears protests only from an “interested party” — an actual or prospective offeror whose direct economic interest is affected. In practice that means a company that bid and lost, or one that would compete if the solicitation were corrected. Subcontractors, suppliers, and trade associations do not have standing. You do not need a lawyer to file, though for anything involving access to the agency’s source-selection record you will want outside counsel admitted under a protective order, because company personnel cannot see that material.
The Clocks That Matter
There are three distinct timeliness rules, and they are unforgiving. Challenges to the terms of a solicitation — ambiguous specs, restrictive requirements, a wired evaluation scheme — must be filed before proposals are due. Everything else runs on a 10-calendar-day rule: the protest must be filed within 10 days of when you knew or should have known the basis for it. The third clock is the debriefing exception: when a debriefing is required, you may not protest before the debriefing date, but you must file within 10 days after it is held.
Layered on top is the deadline that usually matters most: the automatic stay. Under the Competition in Contracting Act, the agency must suspend contract performance if GAO notifies it of a protest within 10 days of award or within 5 days after a required debriefing is offered, whichever is later. Miss the stay window and your protest can proceed — while the awardee starts work. Defense contractors get one wrinkle in their favor: in DoD enhanced debriefings, submitting written follow-up questions within two business days extends the debriefing, and the 5-day stay clock does not start until the agency answers.
Filing: EPDS and the Fee
All GAO protests are filed through the Electronic Protest Docketing System (EPDS), with a filing fee of $500, raised from $350 in October 2024. The protest itself must identify the procurement, state the legal and factual grounds, and explain why you are an interested party. Boilerplate dies fast at GAO; the protests that survive plead specific, record-based evaluation errors — a misscored factor, an unequal discussion, a waived requirement — not general unhappiness with the outcome.
What Happens After You File
The agency must produce its report — the contracting officer’s statement, the evaluation record, and relevant documents — within 30 days. Your comments on that report are due 10 days later, and skipping them gets the protest dismissed. GAO must issue its decision within 100 calendar days of filing, a statutory ceiling it does not blow. For straightforward cases there is an express option that compresses the schedule to 65 days, with the agency report due in 20. Hearings have become vanishingly rare: GAO held them in 3 cases in fiscal 2025 — half of one percent. Alternative dispute resolution is the quiet workhorse, used in 53 cases last year with a 91 percent success rate.
The Odds, Honestly
Fiscal 2025’s numbers tell a two-sided story. Of 380 merit decisions, GAO sustained 53 — a 14 percent sustain rate, the lowest in over two decades. But the sustain rate is the wrong number to plan around. The effectiveness rate — protesters who obtained some relief, whether through a sustain or the agency taking voluntary corrective action — was 52 percent, holding steady year over year. Agencies frequently moot strong protests by fixing the problem rather than litigating it. The most common winning grounds remain unreasonable technical evaluation, unreasonable cost or price evaluation, and unreasonable rejection of a proposal. Filing volume, meanwhile, fell 6 percent, continuing a drift of complex cases toward the Court of Federal Claims as a first forum.
What You Win
GAO does not award you the contract. A sustained protest produces a recommendation — recompete, reopen discussions, terminate the award, amend the solicitation, or refrain from exercising options — plus, typically, reimbursement of your protest costs, including attorneys’ fees. Agencies almost always follow the recommendations. Cost claims must go to the agency within 60 days of GAO’s recommendation on costs.
The Alternatives
An agency-level protest under FAR 33.103 is cheaper and faster but carries no CICA automatic stay — the FAR directs the agency to withhold award or suspend performance while it considers the protest, but the agency can override that internally, and filing there does not extend your GAO stay window; if it fails, you have 10 days from adverse agency action to refile at GAO. The Court of Federal Claims accepts protests as a first forum or after a GAO loss, with no deadline as tight as GAO’s, but no automatic stay either — you must persuade a judge to enjoin performance, and the litigation is materially more expensive.
What It Means for Contractors
Three rules of thumb. First, calendar the stay deadline before you do anything else: 10 days from award or 5 from the offered debriefing, whichever is later, is the only window in which a protest stops the work. Second, always take the debriefing, and at DoD always submit enhanced-debriefing questions — it is free discovery and it extends your clock. Third, judge the decision to protest against the 52 percent effectiveness rate, not the 14 percent sustain rate, and be candid about which side of that line your facts fall on. A protest built on a specific, documentable evaluation error is a coin-flip proposition with a stay attached; a protest built on disappointment is a $500 donation to the Treasury.
