174
Opinion of the Court
deduction, but Congress has provided no definition of "principal place of business."
In interpreting the meaning of the words in a revenue Act, we look to the " 'ordinary, everyday senses' " of the words. Malat v. Riddell, 383 U. S. 569, 571 (1966) (per curiam) (quoting Crane v. Commissioner, 331 U. S. 1, 6 (1947)). In deciding whether a location is "the principal place of business," the commonsense meaning of "principal" suggests that a comparison of locations must be undertaken. This view is confirmed by the definition of "principal," which means "most important, consequential, or influential." Webster's Third New International Dictionary 1802 (1971). Courts cannot assess whether any one business location is the "most important, consequential, or influential" one without comparing it to all the other places where business is transacted.
Contrary to the Court of Appeals' suggestion, the statute does not allow for a deduction whenever a home office may be characterized as legitimate. See 935 F. 2d, at 55. That approach is not far removed from the "appropriate and helpful" test that led to the adoption of § 280A. Under the Court of Appeals' test, a home office may qualify as the principal place of business whenever the office is essential to the taxpayer's business, no alternative office space is available, and the taxpayer spends a substantial amount of time there. See id., at 54. This approach ignores the question whether the home office is more significant in the taxpayer's business than every other place of business. The statute does not refer to the "principal office" of the business. If it had used that phrase, the taxpayer's deduction claim would turn on other considerations. The statute refers instead to the "principal place" of business. It follows that the most important or significant place for the business must be determined.
B
In determining the proper test for deciding whether a home office is the principal place of business, we cannot de-
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