Section 102-38.255 - May we allow a bidder to modify or withdraw a bid?(a) Yes, a bidder may modify or withdraw a bid prior to the start of the sale or the time set for the opening of the bids. After the start of the sale, or the time set for opening the bids, the bidder will not be allowed to withdraw their bid.(b) You may consider late modifications to an otherwise successful bid at any time, but only when it makes the terms of the bid more favorable to the Government.