- 10 - their 1999 return. Because petitioners did not petition the Court in response to the notice, the assessment period did not expire until September 15, 2003.4 See sec. 6503(a)(1). Thus, the assessment of tax on August 4, 2003, was timely. As discussed above, petitioners also wish to contest the adjustments made in the notice of deficiency. Respondent’s refusal to consider this issue was an abuse of discretion. See sec. 6330(c)(2)(B). The Court therefore will issue an order setting this case for further trial on the issue of the underlying tax liability. To reflect the foregoing, An appropriate order will be issued. 4 Three years after the due date of petitioners’ 1999 return was Apr. 17, 2003. See supra note 3. Although 150 days after that date was Sunday, Sept. 14, 2003, the assessment period was extended until the next business day. See sec. 7503; see also Orrock v. Commissioner, T.C. Memo. 1982-293 (holding that sec. 7503 applies to the acts of either a taxpayer or the Commissioner); sec. 301.7503-1(a), Proced. & Admin. Regs.Page: Previous 1 2 3 4 5 6 7 8 9 10 11Last modified: November 10, 2007