176
Opinion of the Court
the deduction is allowed whether or not the home office is also the principal place of business. The taxpayer argues that because the point of delivery of goods and services is addressed in this provision, it follows that the availability of the principal place of business exception does not depend in any way upon whether the home office is the point of delivery. We agree with the ultimate conclusion that visits by patients, clients, and customers are not a required characteristic of a principal place of business, but we disagree with the implication that whether those visits occur is irrelevant. That Congress allowed the deduction where those visits occur in the normal course even when some other location is the principal place of business indicates their importance in determining the nature and functions of any enterprise. Though not conclusive, the point where services are rendered or goods delivered is a principal consideration in most cases. If the nature of the business requires that its services are rendered or its goods are delivered at a facility with unique or special characteristics, this is a further and weighty consideration in finding that it is the delivery point or facility, not the taxpayer's residence, where the most important functions of the business are undertaken.
Unlike the Court of Appeals, we do not regard the necessity of the functions performed at home as having much weight in determining entitlement to the deduction. In many instances, planning and initial preparation for performing a service or delivering goods are essential to the ultimate performance of the service or delivery of the goods, just as accounting and billing are often essential at the final stages of the process. But that is simply because, in integrated transactions, all steps are essential. Whether the functions performed in the home office are necessary to the business is relevant to the determination of whether a home office is the principal place of business in a particular case, but it is not controlling. Essentiality, then, is but part of the assess-
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