to the extent, and only to the extent, such costs are incident to and necessary for production or manufacturing operations or processes.
Notwithstanding the preceding sentence, if a taxpayer consistently includes in his computation of the amount of inventoriable costs any of the costs described in the preceding sentence, a change in such method of inclusion shall be considered a change in method of accounting within the meaning of sections 446, 481, and paragraph (e)(4) of this section.
Corporation X operates a stamping plant with a theoretical capacity of 50 units per hour. The plant actually operates 1960 hours per year based on an 8-hour day, 5 day week basis and 15 shutdown days for vacations and holidays. A reasonable allowance for down time (the time allowed for ordinary and necessary repairs and maintenance) is 5 percent of practical capacity before reduction for down time. Assuming no loss of production during starting up, closing down, or employee work breaks, under these facts and circumstances X may properly make a practical capacity computation as follows:
Practical capacity without allowance for down time based on theoretical capacity per hour is (1960 * 50) | 98,000 |
Reduction for down time (98,000 * 5 percent) | 4,900 |
Practical capacity | 93,100 |
The 93,100 unit level of activity (i.e., practical capacity) would, therefore, constitute an appropriate base for calculating the amount of fixed indirect production costs to be included in the computation of the amount of inventoriable costs for the period under review. On this basis if only 76,000 units were produced for the period, the effect would be that approximately 81.6 percent (76,000, the actual number of units produced, divided by 93,100, the maximum number of units producible at practical capacity) of the fixed indirect production costs would be included in the computation of the amount of inventoriable costs during the year. The portion of the fixed indirect production costs not so included in the computation of the amount of inventoriable costs would be deductible in the year in which paid or incurred. Assume further that 7,600 units were on hand at the end of the taxable year and the 7,600 units were in the same proportion to the total units produced. Thus, 10 percent (7,600 units in inventory at the end of the taxable year, divided by 76,000, the actual number of units produced) of the fixed indirect production costs included in the computation of the amount of inventoriable costs (the above-mentioned 81.6 percent) and 10 percent of the variable indirect production costs would be included in the cost of the goods in the ending inventory, in accordance with a method of allocation provided by this paragraph.
26 C.F.R. §1.471-11