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IRS.gov Website
Publication 542
taxmap/pubs/p542-005.htm#TXMP6a1eaf04

Accounting Periods

rule
A corporation must figure its taxable income on the basis of a tax year. A tax year is the annual accounting period a corporation uses to keep its records and report its income and expenses. Generally, corporations can use either a calendar year or a fiscal year as its tax year. A corporation must adopt a tax year by the due date (not including extensions) of its first income tax return.
taxmap/pubs/p542-005.htm#TXMP0a57e739

Personal service corporation.

rule
A personal service corporation must use a calendar year as its tax year unless:
If a personal service corporation makes a section 444 election, its deduction for certain amounts paid to employee-owners may be limited. See Schedule H (Form 1120), Section 280H Limitations for a Personal Service Corporation (PSC), to figure the maximum deduction.
taxmap/pubs/p542-005.htm#TXMP55035c4d

Change of tax year.

rule
Generally, a corporation must get the consent of the IRS before changing its tax year by filing Form 1128. However, under certain conditions, a corporation can change its tax year without getting the consent. For more information see Form 1128 and Publication 538.