GAO Bid Protest Trends FY2025: What a 14% Sustain Rate Tells Us About Source Selection

Every December, the Government Accountability Office publishes its annual bid protest report to Congress. The FY2025 edition — GAO-26-900695, released December 12, 2025 — contained a headline that should get the attention of every federal contracting officer: 1,688 bid protest cases, a 6% decline from FY2024, with a 14% sustain rate.

That last number is the one that matters most. GAO sustained 14% of the protests it decided on the merits — meaning roughly one in seven challenges to federal award decisions was found to have merit. For context, a sustained protest almost always means contract performance is disrupted, the agency faces corrective action, and the acquisition has to be at least partially redone.

What the Decline Means — and Doesn't Mean

The 6% decline in protest volume is worth acknowledging. Fewer protests filed generally indicates one of two things: either agencies are running better-documented source selections that leave fewer grounds for challenge, or the market is becoming more selective about which protests are worth filing (given the cost and time involved). Both interpretations suggest some improvement in acquisition quality.

But the 14% sustain rate puts a ceiling on how much comfort to take from the volume trend. When GAO decides a protest on its merits — meaning it gets past the threshold questions and is actually reviewed — the agency's source selection decision holds up only 86% of the time. That's not a crisis, but it's a meaningful error rate for decisions that determine which contractor gets the work and at what price.

Why Source Selections Still Get Protested — and Sustained

The GAO sustain rate has been relatively stable over the past several years. The underlying reasons tend to fall into a consistent set of categories:

• Evaluation inconsistency — the agency applied evaluation criteria differently to different offerors, or evaluated proposals against unstated criteria not included in the solicitation
• Documentation gaps — the source selection decision document doesn't adequately explain how the evaluation panel reached its conclusions, leaving the agency unable to defend the rationale
• Disparate treatment — technically acceptable proposals were treated differently without documented justification
• Flawed discussions — when discussions were held, they didn't provide offerors with a meaningful opportunity to revise proposals on identified weaknesses

What's notable about this list is that every item on it is a documentation and process failure, not a judgment failure. The agencies that get sustained protests don't usually pick the wrong contractor. They fail to create a record that shows they picked the right one for the right reasons.

The Documentation Standard GAO Applies

GAO's review of a bid protest centers on one central question: was the agency's evaluation reasonable and consistent with the solicitation's stated evaluation criteria? To answer that question, GAO examines the administrative record — the evaluation documents, scoring sheets, narrative justifications, consensus notes, and source selection decision document that the agency produced during the acquisition.

If that record is complete, consistent, and traceable — if every rating has a written justification, if every scoring decision connects back to the solicitation's criteria, if the source selection decision explains how the tradeoffs were made — the protest has very little to work with. If the record has gaps, inconsistencies, or undocumented judgment calls, those gaps become the protest.

This is why source selection software that enforces documentation at each step — requiring narrative justifications before ratings can be submitted, timestamping every evaluator action, generating complete source selection reports from structured evaluation data — directly addresses the root cause of most sustained protests.

Practical Takeaways for Contracting Officers

• Treat every source selection as if it will be protested. Not because it will be, but because the documentation standard for a protest-resistant selection is exactly the same as the documentation standard for a good selection. They're the same thing.
• Require written narrative before scoring. Evaluator ratings unsupported by written justification are the most common documentation gap in sustained protests. Build the narrative requirement into your process, not as an afterthought.
• Document your evaluation criteria application. If you're applying a criterion that isn't in the solicitation — even implicitly — you've created protest risk. Keep the evaluation anchored to what was stated.
• Keep a clean consensus record. The discussion that happens when evaluators disagree needs to be documented. What changed, why, and on whose recommendation. That record is often the difference between a sustained and a dismissed protest.

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The FY2025 numbers are modestly encouraging — fewer protests, and agencies are clearly doing something better than they were a few years ago. But a 14% sustain rate on merits-based decisions means there's still meaningful room to improve. The agencies closing that gap are the ones treating source selection documentation as a first-class part of the acquisition process, not an administrative formality done after the fact.