- Payers must file information returns (except certain Forms 1099-MISC with non-employee compensation payments in box 7, which are due before January 31) with the IRS. (Except for certain Forms 1099-MISC outlined earlier, the deadline is March 31 if filing electronically.)
- Forms 1095-B and 1095-C due to the IRS, if filing on paper.
- Farmers and fishermen who did not make 2016 estimated tax payments must file 2016 tax returns and pay taxes in full.
- Large employers must furnish Form 1095-B and Form 1095-C to employees.
- 2016 calendar-year S corporation Form 1120S income tax returns are due.
- 2016 calendar-year partnerships Form 1065 income tax returns are due.
- Forms 1095-B and 1095-C due to the IRS, if filing electronically. (Employers who have 250 or more employees are required to file electronically.)