- 6 - Helvering, 290 U.S. 111, 115 (1933). However, pursuant to section 7491(a), the burden of proof with respect to any factual issue relating to ascertaining the liability for tax shifts to the Commissioner if the taxpayer: (1) Maintained adequate records; (2) satisfied the substantiation requirements; (3) cooperated with the Commissioner’s agents; and (4) during the Court proceeding introduced credible evidence with respect to the factual issue involved. As discussed infra, we find that petitioner failed to satisfy these requirements. Therefore, the burden of proof does not shift to respondent. Expenses for business use of a taxpayer’s home are deductible under limited circumstances. For the expense to be deductible, the taxpayer must show that the portion of the home purported to be used for business is: (1) The taxpayer’s principal place of business; (2) a place where the taxpayer meets or deals with customers, clients, or patients; or (3) a separate structure used in connection with the business. It must be used exclusively on a regular basis for these things. Sec. 280A(c)(1)(A)-(C). Finally, in the case of an employee, the home office must be for the convenience of the employer. Sec. 280A(c)(1) (flush language). Petitioner seeks to satisfy the requirements of section 280A by claiming that a portion of his home was his “principal place of business” for purposes of the book writing project and that hePage: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 NextLast modified: November 10, 2007