A bid protest is a formal legal challenge to how a federal agency wrote a solicitation, evaluated proposals, or awarded a contract. A company that believes the government broke procurement rules can file one at the contracting agency itself, at the Government Accountability Office, or at the U.S. Court of Federal Claims. The GAO alone handles over a thousand protests a year, and filing there triggers an automatic freeze on the contested contract while the case is decided.
Who Can File
Federal regulations limit protest rights to an “interested party,” defined as an actual or prospective bidder whose direct economic interest would be affected by the award or the failure to award the contract.1eCFR. 4 CFR Part 21 – Bid Protest Regulations In practice, you either submitted a proposal or were clearly positioned to compete for the work.
A company that operates in the same industry but did not bid lacks standing. So does a subcontractor with no prime-level relationship with the agency, and a member of the public who simply objects to how tax dollars are being spent.
Standing also requires prejudice. It is not enough to show the agency made an error. You must show that without the mistake, you would have had a substantial chance of winning. Protests that identify real violations but cannot connect them to a competitive disadvantage routinely fail.
Grounds That Actually Work
Every protest must identify a specific legal or factual error. Vague complaints about fairness go nowhere. The strongest protests point to a concrete rule the agency broke and explain how it changed the outcome. The Federal Acquisition Regulation provides the procedural framework.2Acquisition.GOV. Federal Acquisition Regulation Part 33 – Protests, Disputes, and Appeals
Evaluation Errors
The most common protest ground is an agency straying from its own evaluation criteria. When an agency publishes a Request for Proposals, it commits to judging bids by the factors listed in that document. If evaluators introduce unstated criteria, ignore a stated factor, or weight factors differently than announced, the award is legally vulnerable.
Past performance is another fertile area. Agencies must compare offerors’ track records on a relative scale, not just check a pass/fail box. For small businesses, an agency cannot reject a bidder as non-responsible based on past performance without first referring the matter to the Small Business Administration for a Certificate of Competency review.
Unequal Treatment
If an agency evaluates one bidder more leniently than another, holds discussions with some offerors but not all, or shares information with a single company that competitors never received, any resulting award can be overturned. The test is whether the unequal treatment could have affected the competitive standings.
Flawed Solicitation Terms
Some protests target the solicitation itself, before any bids are submitted. Specifications so narrow they effectively restrict competition to a single company, or requirements so ambiguous that bidders cannot compete on equal footing, are both protestable. These challenges must be filed early. Waiting until after the award to complain about a defect you noticed in the solicitation will get your protest dismissed.
Price Evaluation Problems
Pricing disputes come in two forms. A price reasonableness challenge argues that the winning price is too high and the agency failed to catch it. A price realism challenge argues that the price is suspiciously low and the agency should have recognized it as a performance risk. In fixed-price contracts, agencies generally are not required to evaluate whether a competitor’s price is too low unless the solicitation specifically calls for a realism analysis.
Where to File
Federal protests can go to three places, each with distinct advantages. The right choice depends on how much money is at stake, how fast you need a decision, and whether you need the power of a court order behind the result.
The Contracting Agency
Filing directly with the contracting agency is the fastest and cheapest route because it lets the agency fix its own mistake without outside intervention. The drawback is obvious: the agency is both the party you are challenging and the decision-maker. Agencies do sometimes reverse themselves, especially when the error is clear-cut and the contracting officer wants to avoid a GAO protest.
Government Accountability Office
The GAO is by far the most common forum. It offers specialized expertise in procurement law, a structured 100-day decision timeline, and an automatic stay that freezes the contract while the protest is pending.3eCFR. 4 CFR 21.9 – Time for Decision by GAO The filing fee is $500.4U.S. GAO. File a Bid Protest
GAO decisions are technically recommendations rather than binding orders, but agencies follow them in the vast majority of cases. In fiscal year 2025, the GAO sustained about 14 percent of protests decided on the merits.5U.S. GAO. GAO Bid Protest Annual Report to Congress for Fiscal Year 2025 That figure understates the real effectiveness of the process, because many protests prompt the agency to take voluntary corrective action before a decision is issued.
U.S. Court of Federal Claims
The COFC operates as a federal court. Filing there involves formal litigation with broader discovery rights and the power to issue binding injunctions the agency must obey. The filing fee is $405.6U.S. Court of Federal Claims. U.S. Court of Federal Claims Schedule of Fees There is no automatic stay. You must affirmatively seek a temporary restraining order or preliminary injunction, and to get one, you need to show you are likely to win on the merits, that you face irreparable harm without relief, that the balance of equities favors you, and that an injunction serves the public interest. Cases at the COFC often take longer than 100 days, but the binding judicial authority makes this forum attractive for high-value contracts where a GAO recommendation might not be enough.
Deadlines That Decide the Case
Timeliness is where most potential protests die. Miss a deadline by even a single day and the GAO will dismiss your case regardless of how strong your legal argument is.
Solicitation defects. If you spot a problem with the solicitation itself, file before the deadline for submitting proposals. Once bids are due, your window to challenge the solicitation’s terms has closed. If an amendment introduces a new problem, protest before the next proposal submission deadline after the amendment.
Post-award protests. For protests based on how the agency evaluated bids or selected a winner, the general rule is that you must file within 10 days of when you knew or should have known the basis for your protest. In competitive-proposal procurements where a debriefing is required, you cannot file before the debriefing occurs, but you must file within 10 days after it is held. A protest filed before the debriefing is premature and will be dismissed.
After an agency-level denial. You have 10 days from learning of an adverse agency decision to escalate to the GAO.
The 5-day stay window. The automatic stay at the GAO only kicks in if you file within tight windows: within 10 days of the contract award, or within 5 days of a required debriefing.7Office of the Law Revision Counsel. 31 U.S. Code 3553 – Review of Protests; Effect on Contracts Pending Decision File after that and you can still protest, but the agency may allow the winning contractor to start work while your case is pending.
The Debriefing Comes First
Before you can build a strong protest, you need to understand why you lost. A post-award debriefing gives you that information. You are entitled to request a debriefing within three days of learning you were not selected, and the agency must provide it.8Acquisition.GOV. Postaward Debriefing of Offerors
During the debriefing, the agency must disclose the significant weaknesses or deficiencies in your proposal, the overall cost and technical ratings for both you and the winner, any ranking of offerors developed during evaluation, and a summary of why the winning bidder was chosen. The agency will not provide a side-by-side comparison against the winner’s proposal, and it cannot reveal trade secrets, confidential cost breakdowns, or the names of individuals who provided past performance references.
The information you receive there often forms the entire factual foundation of a protest. If the agency reveals that it applied unstated evaluation criteria, rated the winner higher despite weaker past performance, or conducted discussions with some offerors but not others, those are protest grounds. If nothing the agency tells you suggests a legal violation, that is valuable information too, because filing without a solid basis wastes money and credibility.
The Automatic Stay
One of the most powerful features of a GAO protest is the automatic stay triggered by the Competition in Contracting Act. When the contracting agency receives notice that a timely protest has been filed, the contracting officer must either withhold the award or, if the contract was already awarded, direct the contractor to stop work. This keeps the status quo in place while the GAO reviews the case.
The stay is not absolute. The head of the contracting agency can override it by making a written finding that urgent and compelling circumstances or the best interests of the United States require performance to continue. Overrides do happen, particularly in national security or emergency situations, but they are the exception.
At the COFC, no automatic stay exists. If you want the contract frozen while the court considers your case, you must file a motion for a preliminary injunction. Failing to seek injunctive relief means the winning contractor may complete the work before your case is decided, which can make the protest moot as a practical matter even if you win on the legal merits.
What Happens After You File
Once a GAO protest is docketed, the process moves on a predictable timeline. The agency must produce a complete report on the protested procurement, including all relevant internal documents, within 30 days of receiving notice of the protest. This administrative report is often the most revealing part of the process, because it contains the evaluation records, source selection memoranda, and internal communications that explain how the agency reached its decision.
Much of the agency report will contain proprietary or source-selection-sensitive information from competing offerors. To view this material, your attorney must obtain admission under a protective order issued by the GAO. Only outside counsel who are not involved in competitive decision-making for your company can access protected information.9eCFR. 4 CFR 21.4 – Protective Orders This is one of the strongest reasons to retain experienced government contracts counsel before filing.
After reviewing the agency report, you can file comments responding to the record. If the report reveals new grounds for protest that you could not have known about earlier, you can raise supplemental protest arguments at this stage. The GAO then issues a decision within 100 days of the original filing date.
Agencies frequently take voluntary corrective action after seeing the protest arguments or the strength of the protester’s case. Corrective action might mean re-evaluating proposals, reopening discussions, or canceling the solicitation and starting over. When the agency takes corrective action, the GAO typically closes the case without a decision on the merits. The protester can then request that the GAO recommend the agency reimburse its protest costs, including attorney fees.
What You Can Win
If the GAO sustains your protest, it recommends a remedy tailored to the situation. Available remedies include directing the agency to recompete the contract, issue a new solicitation, terminate the existing contract, award the contract consistent with the law, or any combination of these.10eCFR. 4 CFR 21.8 – Remedies The GAO considers factors like the seriousness of the violation, the degree of prejudice, how much performance has already occurred, the cost to the government, and the urgency of the procurement.
On the cost recovery side, the GAO can recommend that the agency reimburse your protest costs, including reasonable attorney fees and consultant or expert witness fees, as well as the costs of preparing your bid or proposal.11Office of the Law Revision Counsel. 31 U.S. Code 3554 – Review of Protests; Effect on Contracts Pending Decision Attorney fee recovery is generally capped at $150 per hour. Small businesses are exempt from the caps on consultant and expert witness fees.
At the COFC, the court has broader remedial powers including permanent injunctions. However, the COFC does not have independent authority to award bid preparation costs or attorney fees in the same way the GAO can recommend them. The trade-off is that a COFC order is legally binding, whereas a GAO recommendation relies on agency compliance, even though that compliance rate is extremely high.
What You Need to File
You must provide the solicitation or contract number, the name of the contracting agency, and the date of the award or the date you learned of the basis for your protest. The protest letter itself must contain a clear statement of the legal and factual grounds, explain how you were prejudiced, and request a specific remedy.
Gather the original solicitation, any amendments, your proposal or relevant excerpts, all communications with the contracting officer, and your debriefing notes or slides. If you filed an agency-level protest first, include the agency’s response. For GAO filings, all submissions go through the Electronic Protest Docketing System, which is the exclusive method for filing and for all subsequent case communications. Documents must be received in the system by 5:30 p.m. Eastern Time to count as filed on that day.
State and Local Contracts Are Different
Everything above applies to federal procurement. State and local governments have their own protest processes, and the rules vary enormously from one jurisdiction to the next. A protest ground that is well-established in federal practice may not exist under state law, and filing deadlines at the state level are sometimes even shorter than the GAO’s 10-day window. Most state and local jurisdictions require you to file initially with an executive branch agency before seeking judicial review, but the specific procedures, standing requirements, available remedies, and standards of review all differ. If your dispute involves a state or local contract, research that jurisdiction’s specific procurement code before assuming any of the federal rules apply.