- 16 - res judicata. The District Court thus applied the doctrine of res judicata on the basis of the prior decision of the District Court in the New York case. Petitioner did not appeal the District Court’s decision in the North Carolina case, which is now final. Petitioner cannot now challenge that decision or raise the section 6303 claim. With respect to the expiration of the period of limitations, under section 183(e)(4), if a taxpayer elects to postpone the determination of whether an activity is engaged in for profit, and in particular whether the presumption of section 183(d) applies to the activity, the statutory period for making assessments with regard to that activity does not expire until 2 years after the due date for filing the return for the last year of the 5-taxable-year period to which the election applies. Petitioner elected to postpone the determination of whether his fishing was engaged in for profit beginning with the 1990 tax year. Therefore, the period of limitations for making an assessment with regard to that activity for 1990 and 1991 did not expire until April 15, 1997. The notices of deficiency were issued on November 3, 1995. Filing a Form 5213 is a means by which a taxpayer may elect to postpone the determination as to whether a certain activity is engaged in for profit, for purposes of applying section 183. Wadlow v. Commissioner, 112 T.C. 247, 250-251 (1999). The regulations provide that an individualPage: Previous 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 NextLast modified: November 10, 2007