GAO Bid Protest Sustain Rate (2026): The 14% Number - and How Agency Protest Friction Changes Your pWin
GAO FY2025: 1,688 cases filed, 53 sustains, 14% sustain rate on merits, 52% effectiveness rate when corrective action counts. That national baseline is not your agency's personality. Fed-Spend Buyer Intelligence turns protest friction into a bid/no-bid input beside incumbent concentration - the signal behind the pWin gate.
The free aha: 14% sustain is not 52% relief
Most teams quote "GAO sustain rate" and stop. FY2025 makes the split impossible to ignore:
| Metric | FY2025 | What it means |
|---|---|---|
| Cases filed | 1,688 (down 6% YoY) | Volume fell again |
| Merit decisions (sustain + deny) | 380 | Cases that reached a merits outcome |
| Sustains | 53 | GAO found a prejudicial violation |
| Sustain rate | 14% | Sustains / merits decisions |
| Effectiveness rate | 52% | Protester got relief via sustain or agency corrective action |
If you only model a 14% chance of winning at GAO, you understate the 52% path where the agency fixes the record after you protest. If you only model 52%, you overstate how often GAO itself brands the award unlawful.
Source: GAO Bid Protest Annual Report to Congress for Fiscal Year 2025.
Five-year scoreboard
| Fiscal year | Cases filed | Merit decisions | Sustains | Sustain rate | Effectiveness rate |
|---|---|---|---|---|---|
| 2025 | 1,688 | 380 | 53 | 14% | 52% |
| 2024 | 1,803 | 386 | 61 | 16% | 52% |
| 2023 | 2,025 | 608 | 188 | 31% | 57% |
| 2022 | 1,658 | 455 | 59 | 13% | 51% |
| 2021 | 1,897 | 581 | 85 | 15% | 48% |
FY2023's 31% sustain rate was an anomaly (GAO notes a spike tied to unusual multi-protest clusters). Treat 13-16% as the modern sustain band and ~50% as the effectiveness band.
Top FY2025 sustain grounds (GAO): unreasonable technical evaluation; unreasonable cost/price evaluation; unreasonable rejection of proposal.
Why "by agency" still matters
National rates are a ceiling check. Your bid/no-bid needs the agency's protest personality:
Fed-Spend Buyer Intelligence surfaces protest friction beside incumbent concentration and set-aside mix on agency pages such as DoD, DHS, VA, and GSA. That is the agency layer the annual GAO table cannot give you in one national percentage.
GAO's own trends work (GAO-25-108652) also notes DoD protest filings declining faster than the government-wide total in recent years - another reason to stop treating every agency like the same courtroom.
How this feeds pWin (the converting gate)
PostHog already shows `pwin_verdict` as a top paid gate. The engine fuses six signals - including GAO protest history - into one Go/No-Go score. Practical workflow:
What not to do
Bottom line
FY2025 GAO math is simple and sharp: 14% sustain on merits, 52% effectiveness when corrective action counts, on 1,688 filings. The free aha is knowing which number you are quoting. The converting aha is reading agency protest friction inside Buyer Intelligence and folding it into pWin before you bid.
Run pWin on your next pursuit - start from Capture Room or pricing. Open an agency brief for protest friction today.
Primary sources: GAO Bid Protest Annual Report to Congress for Fiscal Year 2025 (GAO-26-900695); GAO-25-108652 Bid Protests: Key Features and Trends; Fed-Spend Buyer Intelligence / pWin product surfaces.
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