MARCH
15th
Due date for calendar-year corporate income tax returns.
APRIL
15th
Due date for filing individual income tax returns or extensions.
First quarter individual income tax estimate.
JUNE
15th
Second quarter individual income tax estimate.
SEPTEMBER
15th
Due date for filing calendar-year corporate income tax returns under extension.
Third quarter individual income tax estimate.
OCTOBER
15th
Due date for filing individual tax return under second extension.
JANUARY
15th
Fourth quarter individual income tax estimate.
