What is the deadline for filing a protest based on improprieties in a solicitation?

The correct answer is centered on the requirement that protests based on improprieties in a solicitation must typically be filed within a specified time frame to be considered valid. In federal contracting, if a potential bidder or offeror perceives an issue or impropriety in a solicitation, they must adhere to the timeline established by the regulations governing such protests.

Filing a protest within 10 calendar days after the basis of the protest is known ensures that the matter is addressed in a timely manner, allowing the contracting agency to rectify the issue before moving forward with contract awards. This timeframe is crucial for maintaining the integrity of the procurement process and ensuring that all potential bidders have a fair opportunity to compete.

While filing before the bid opening is relevant for other types of concerns, it does not encompass the broader scenario where understanding and recognizing an impropriety may come after that point. The requirement to file within five calendar days would be too short to realistically allow for recognizing and processing an impropriety, and post-award protests usually address different issues related to contractual obligations rather than solicitation improprieties. Thus, the 10-day window strikes the appropriate balance, providing the necessary time frame for due diligence while ensuring that the procurement process remains efficient.