If the taxpayer files a petition with the Tax Court, the entire amount redetermined as the deficiency by the decision of the Tax Court which has become final shall be assessed and shall be paid upon notice and demand from the Secretary. No part of the amount determined as a deficiency by the Secretary but disallowed as such by the decision of the Tax Court which has become final shall be assessed or be collected by levy or by proceeding in court with or without assessment.
26 U.S. Code § 6215 - Assessment of deficiency found by Tax Court
2018—Subsec. (b)(5) to (7). Pub. L. 115–141 redesignated pars. (6) and (7) as (5) and (6), respectively, and struck out former par. (5) which read as follows: “For treatment of certain deficiencies as having been paid, in connection with sale of surplus war-built vessels, see section 9(b)(8) of the Merchant Ship Sales Act of 1946 (50 U.S.C. App. 1742).”
For provisions that nothing in amendment by Pub. L. 115–141 be construed to affect treatment of certain transactions occurring, property acquired, or items of income, loss, deduction, or credit taken into account prior to Mar. 23, 2018, for purposes of determining liability for tax for periods ending after Mar. 23, 2018, see section 401(e) of Pub. L. 115–141, set out as a note under section 23 of this title.