- March 1 – Due date for farmers and fishermen who chose not to make 2015 estimated tax payments to file 2015 tax returns and pay taxes in full to avoid underpayment penalties.
- March 15 – 2015 calendar-year corporation income tax returns are due.
- March 15 – Deadline for calendar-year corporations to elect S corporation status for 2016.
- March 31 – Payers who file electronically must submit 2015 information returns (such as 1099s) to the IRS.
- March 31 – Employers who file electronically must submit 2015 W-2 copies to the Social Security Administration.
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