Publication 583 - Tax Year
You must figure your taxable income and file an income tax return based on an annual accounting period called a
tax year. A tax year is usually 12 consecutive months. There are two kinds of tax years.

Calendar tax year. A calendar tax year is 12 consecutive months beginning January 1 and ending December
Fiscal tax year. A fiscal tax year is 12 consecutive months ending on the last day of any month except
December. A 52-53-week tax year is a fiscal tax year that varies from 52 to 53 weeks but does not have to end
on the last day of a month.

If you file your first tax return using the calendar tax year and you later begin business as a sole proprietor,
become a partner in a partnership, or become a shareholder in an S corporation, you must continue to use the
calendar year unless you get IRS approval to change it or are otherwise allowed to change it without IRS approval.

You must use a calendar tax year if:

- You keep no books.
- You have no annual accounting period.
- Your present tax year does not qualify as a fiscal year.
- You are required to use a calendar year by a provision of the Internal Revenue Code or the Income Tax

First-time filer.   If you have never filed an income tax return, you adopt either a calendar tax year or a fiscal tax
year. You adopt a tax year by filing your first income tax return using that tax year. You have not adopted a tax
year if you merely did any of the following.

- Filed an application for an extension of time to file an income tax return.
- Filed an application for an employer identification number.
- Paid estimated taxes for that tax year.

Changing your tax year.   Once you have adopted your tax year, you may have to get IRS approval to change it.
To get approval, you must file Form 1128, Application To Adopt, Change, or Retain a Tax Year. You may have to
pay a fee.

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