- March 2 – Payers must file 2014 information returns (such as 1099s) with the IRS. (Electronic filers have until March 31 to file.)
- March 2 – Employers must send 2014 W-2 copies to the Social Security Administration. (Electronic filers have until March 31 to file.)
- March 2 – Farmers and fishermen who did not make 2014 estimated tax payments are required to file 2014 tax returns and pay taxes in full.
- March 16 – 2014 calendar-year corporation income tax returns are due.
- March 16 – Deadline for calendar-year corporations to elect S corporation status for 2015.
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