Calendar Year A calendar year is 12 consecutive months beginning on January 1st and ending on December 31st.
Fiscal 12 Month Year A fiscal year is 12 consecutive months ending on the last day of any month except December. If you are allowed to adopt a fiscal year, you must consistently maintain your books on the selected basis.
Fiscal 52-53 Week Year You can elect to use a 52-53 week tax year if you keep your books and records and report your income and expenses on that basis. If you make this election, your 52-53 week tax year must always end on the same day of the week. Your 52-53 week tax year must always end on:
- Whatever date this same day of the week last occurs in a calendar month, or
- Whatever date this same day of the week falls that is nearest to the last day of the calendar month.