Not later than 5 days after the day on which an assessment is made under section 6851(a), 6852(a), 6861(a), or 6862, or a levy is made under section 6331(a) without complying with the notice before levy provisions of section 6331(d), the district director shall provide the taxpayer a written statement setting forth the information upon which the district director relies in authorizing such assessment or levy. [T.D. 8453, 57 FR 58985, Dec. 14, 1992]