2017 Tax Season Opening The IRS, the State of Minnesota and most other states have not announced the opening of the 2017 filing season as of yet. Please get your tax information to us as early as possible. S CORP and PARTNERSHIP tax returns due date is March 15, 2018, PERSONAL and C CORP tax returns due date is April 18, 2018. Are you looking for … [Read more...] about Happy New Year 2018!