Individual Income Tax Returns (Form 1040)
April 15th of each year

Individual Estimated Tax Payments (Form 1040 ES and Form 40 ES for Oregon residents)
April 15th, June 15th, September 15th and January 15th of each year

Corporate Income Tax Returns – S Corporations (From 1120S)
March 15th of each year (Some exceptions apply, please inquire for exceptions.)

Corporate Income Tax Returns – C Corporations (From 1120)
March 15th of each year for entities with a year-end of December 31st

For entities with a year-end other than December 31st, the return is due by the 15th day of the third month after the corporation’s year-end.

Partnership Income Tax Return (Form 1065)
April 15th of each year (Some exceptions apply, please inquire for exceptions.)