- 9 - by certified mail to the taxpayer’s last known address, actual receipt of the notice is immaterial. Sec. 6212(b)(1); Frieling v. Commissioner, 81 T.C. 42, 52 (1983). Thus, in Weber v. Commissioner, supra at 263, the notice of determination concerning collection action, sent by certified mail to the taxpayer’s last known address, was held to be valid even though the taxpayer received the notice after the expiration of the 30- day filing period. Regulations promulgated under section 6212 define “last known address” as “the address that appears on the taxpayer’s most recently filed and properly processed Federal tax return, unless the Internal Revenue Service (IRS) is given clear and concise notification of a different address.” Sec. 301.6212- 2(a), Proced. & Admin. Regs. The taxpayer bears the burden of proving that a notice of deficiency was not mailed to his or her last known address. Yusko v. Commissioner, 89 T.C. 806, 808 (1987) (citing Mollet v. Commissioner, 82 T.C. 618, 624-625 (1984), affd. without published opinion 757 F.2d 286 (11th Cir. 1985)). It is well established that an inconsequential error in the address used in mailing the notice of deficiency does not render the notice invalid. Yusko v. Commissioner, supra at 810; Pickering v. Commissioner, T.C. Memo. 1998-142. An error in the address used to mail the notice of deficiency is inconsequentialPage: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 NextLast modified: November 10, 2007