Calendar Year

The calendar year is January 1 through December 31.The normal due date for filing a calendar-year tax return (including the final return of a taxpayer who died during the tax year) is April 15 following the end of the tax year. Taxpayers may receive an automatic extension until August 15 filing Form 4868 by April 15. If April 15 falls on a Saturday, Sunday, or legal holiday, the due date is extended to the next business day.