This tax calendar has the due dates for 2010 that most taxpayers will need. Employers and persons who pay excise taxes also should use the Employer's Tax Calendar and the Excise Tax Calendar.
Fiscal-year taxpayers. If you file your income tax return for a fiscal year rather than the calendar year, you must change some of the dates in this calendar. These changes are described under Fiscal-Year Taxpayers at the end of this calendar.