- 12 - L. 94-455, sec. 601(a), 90 Stat. 1569, the Senate Finance Committee report explained the exclusive use requirement as follows: Exclusive use of a portion of a taxpayer’s dwelling unit means that the taxpayer must use a specific part of a dwelling unit solely for the purpose of carrying on his trade or business. The use of a portion of a dwelling unit for both personal purposes and for the carrying on of a trade or business does not meet the exclusive use test. Thus, for example, a taxpayer who uses a den in his dwelling unit to write legal briefs, prepare tax returns, or engage in similar activities as well for personal purposes, will be denied a deduction for the expenses paid or incurred in connection with the use of the residence which are allocable to these activities. * * * [Emphasis added.] S. Rept. 94-938, at 148 (1976), 1976-3 C.B. (Vol. 3) 49, 186; see also H. Rept. 94-658, at 161 (1975), 1976-3 C.B. (Vol. 2) 695, 853; Staff of Joint Comm. on Taxation, General Explanation of the Tax Reform Act of 1976, at 140 (1976), 1976-3 C.B. (Vol. 2) 1, 152. Similarly, the Court has declined to find that a specific portion of a residence had been used exclusively for business purposes where both business and personal activities permeate an entire residence. Williams v. Commissioner, T.C. Memo. 1991-567; Naggar v. Commissioner, T.C. Memo. 1983-559. The exclusive use requirement is an all-or-nothing standard. See Hamacher v. Commissioner, 94 T.C. 348, 356 (1990). When a taxpayer uses a home office in conducting numerous business activities, each use must be of a type described in section 280A(c)(1); otherwise, the exclusive use requirement is notPage: Previous 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 NextLast modified: March 27, 2008