(d) Activity defined –

1. Ascertainment of activity.
   In order to determine whether, and to what extent, section 183 and the regulations thereunder apply, the activity or activities of the taxpayer must be ascertained. For instance, where the taxpayer is engaged in several undertakings, each of these may be a separate activity, or several undertakings may constitute one activity. In ascertaining the activity or activities of the taxpayer, all the facts and circumstances of the case must be taken into account. Generally, the most significant facts and circumstances in making this determination are the degree of organizational and economic interrelationship of various undertakings, the business purpose which is (or might be) served by carrying on the various undertakings separately or together in a trade or business or in an investment setting, and the similarity of various undertakings. Generally, the Commissioner will accept the characterization by the taxpayer of several undertakings either as a single activity or as separate activities. The taxpayer’s characterization will not be accepted, however, when it appears that his characterization is artificial and cannot be reasonably supported under the facts and circumstances of the case. If the taxpayer engages in two or more separate activities, deductions and income from each separate activity are not aggregated either in determining whether a particular activity is engaged in for profit or in applying section 183. Where land is purchased or held primarily with the intent to profit from increase in its value, and the taxpayer also engages in farming on such land, the farming and the holding of the land will ordinarily be considered a single activity only if the farming activity reduces the net cost of carrying the land for its appreciation in value. Thus, the farming and holding of the land will be considered a single activity only if the income derived from farming exceeds the deductions attributable to the farming activity which are not directly attributable to the holding of the land (that is, deductions other than those directly attributable to the holding of the land such as interest on a mortgage secured by the land, annual property taxes attributable to the land and improvements, and depreciation of improvements to the land).
2. Rules for allocation of expenses.
   If the taxpayer is engaged in more than one activity, an item of deduction or income may be allocated between two or more of these activities. Where property is used in several activities, and one or more of such activities is determined not to be engaged in for profit, deductions relating to such property must be allocated between the various activities on a reasonable and consistently applied basis.
3. Example.
   The provisions of this paragraph may be illustrated by the following example: Example.
   1. Example. A, an individual, owns a small house located near the beach in a resort community. Visitors come to the area for recreational purposes during only 3 months of the year. During the remaining 9 months of the year houses such as A’s are not rented. Customarily, A arranges that the house will be leased for 2 months of 3-month recreational season to vacationers and reserves the house for his own vacation during the remaining month of the recreational season. In 1971, A leases the house for 2 months for $1,000 per month and actually uses the house for his own vacation during the other month of the recreational season. For 1971, the expenses attributable to the house are $1,200 interest, $600 real estate taxes, $600 maintenance, $300 utilities, and $1,200 which would have been allowed as depreciation had the activity been engaged in for profit. Under these facts and circumstances, A is engaged in a single activity, holding the beach house primarily for personal purposes, which is an “activity not engaged in for profit” within the meaning of section 183(c). See paragraph (b)(9) of § 1.183-2.
   2. Since the $1,200 of interest and the $600 of real estate taxes are specifically allowable as deductions under sections 163 and 164(a) without regard to whether the beach house activity is engaged in for profit, no allocation of these expenses between the uses of the beach house is necessary. However, since section 262 specifically disallows personal, living, and family expenses as deductions, the maintenance and utilities expenses and the depreciation from the activity must be allocated between the rental use and the personal use of the beach house. Under the particular facts and circumstances, 2/3 (2 months of rental use over 3 months of total use) of each of these expenses are allocated to the rental use, and 1/3 (1 month of personal use over 3 months of total use) of each of these expenses are allocated to the personal use as follows:

The $700 of expenses and depreciation allocated to the personal use of the beach house are disallowed as a deduction under section 262. In addition, the allowability of each of the expenses and the depreciation allocated to section 183(b)(2) is determined under paragraph (b)(1) (ii) and (iii) of this section. Thus, the maximum amount allowable as a deduction under section 183(b)(2) is $200 ($2,000 gross income from activity, less $1,800 deductions under section 183(b)(1)). Since the amounts described in section 183(b)(2) ($1,400) exceed the maximum amount allowable ($200), and since the amounts described in paragraph (b)(1)(ii) of this section ($600) exceed such maximum amount allowable ($200), none of the depreciation (an amount described in paragraph (b)(1)(iii) of this section) is allowable as a deduction.

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