Title 26 › Subtitle Subtitle A— Income Taxes › Chapter 1— NORMAL TAXES AND SURTAXES › Subchapter E— Accounting Periods and Methods of Accounting › Part I— ACCOUNTING PERIODS › § 441
Compute your taxable income using your taxable year. A "taxable year" can be the annual accounting period you use in your books if it is a calendar year or a fiscal year, the calendar year if special rule (g) applies, the period shown on a return that is less than 12 months, or a period set for a DISC under special rules. "Calendar year" means 12 months ending December 31. "Fiscal year" means 12 months ending the last day of some month other than December, or a 52–53 week year you regularly use that ends on the same weekday and either on the last occurrence of that weekday in a month or on the date nearest the month’s end. If you keep no books, have no annual accounting period, or your accounting period does not qualify as a fiscal year, your taxable year is the calendar year (except for short-period rules in section 443). Special rules apply to 52–53 week years about how to treat start and end dates and how to handle short tax periods; for certain short periods (359 days or more, or under 7 days) the alternative tax rules may not apply, a period under 7 days may be added to the next year, and if annualizing is needed you multiply net income by 365 and divide by the number of days in the short period. The IRS can make rules for applying these week-year rules to partnerships, S corporations, and personal service corporations. A DISC uses the taxable year of the shareholder or group with the largest voting power (voting power means total combined voting power of all voting stock); tied highest shareholders can fix the DISC’s year. Personal service corporations must use the calendar year unless they show a business reason (delaying income to shareholders is not a business reason).
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Internal Revenue Code — Source: USLM XML via OLRC
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Reference
Citation
26 U.S.C. § 441
Title 26 — Internal Revenue Code
Last Updated
Apr 5, 2026
Release point: 119-73not60