General rule
Taxable income shall be computed under the method of accounting on the basis of which the taxpayer regularly computes his income in keeping his books.
Exceptions
If no method of accounting has been regularly used by the taxpayer, or if the method used does not clearly reflect income, the computation of taxable income shall be made under such method as, in the opinion of the Secretary, does clearly reflect income.
Permissible methods
Taxpayer engaged in more than one business
A taxpayer engaged in more than one trade or business may, in computing taxable income, use a different method of accounting for each trade or business.
Requirement respecting change of accounting method
Except as otherwise expressly provided in this chapter, a taxpayer who changes the method of accounting on the basis of which he regularly computes his income in keeping his books shall, before computing his taxable income under the new method, secure the consent of the Secretary.
Failure to request change of method of accounting
Aug. 16, 1954, ch. 73668A Stat. 151Pub. L. 94–455, title XIX, § 190690 Stat. 1834Pub. L. 98–369, div. A, title I, § 161(a)98 Stat. 696(, ; (b)(13)(A), , ; , , .)
Editorial Notes
Amendments
Pub. L. 98–3691984—Subsec. (f). added subsec. (f).
Pub. L. 94–4551976—Subsecs. (b), (c), (e). struck out “or his delegate” after “Secretary”.
Statutory Notes and Related Subsidiaries
Effective Date of 1984 Amendment
Pub. L. 98–369, div. A, title I, § 161(b)98 Stat. 697