qualified offer
(1) In general The term “qualified offer” means a written offer which— (A) is made by the taxpayer to the United States during the qualified offer period; (B) specifies the offered amount of the taxpayer’s liability (determined without regard to interest); (C) is designated at the time it is made as a qualified offer for purposes of this section; and (D) remains open during the period beginning on the date it is made and ending on the earliest of the date the offer is rejected, the date the trial begins, or the 90th day after the date the offer is made.