GAO will frequently dismiss protest grounds based on its strict timeliness rules, as we’ve written about before on the blog. Generally, GAO’s bid protest regulations require a contractor to file a protest within “10 days after the basis of protest is known or should have been known.”

But sometimes knowing when a protest ground is untimely can be difficult. For instance, where a protester should have known the basis for protest based on an inference from a debriefing response and its incumbent knowledge, does that debriefing start the 10-day protest clock running? A recent GAO decision answers that question in the affirmative.