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March 1 - Information Returns Filing Due

File government copies of information returns (Form 1099) and transmittal Forms 1096 for certain payments made during 2020, other than the 1099-NECs that were due February 1. There are different 1099 forms for different types of payments.

March 1 - Farmers and Fishermen

File your 2020 income tax return (Form 1040 or 1040-SR) and pay any tax due. However, you have until April 15 to file if you paid your 2020 estimated tax by January 15, 2021.

March 15 - S-Corporations

File a 2020 calendar year income tax return (Form 1120-S) and pay any tax due. Provide each shareholder with a copy of Schedule K-1 (Form 1120-S), Shareholder’s Share of Income, Deductions, Credits, etc., or a substitute Schedule K-1 (Form 1120-S). To request an automatic 6-month extension of time to file the return, file Form 7004 and pay the tax estimated to be owed. Then file the return; pay any tax, interest, and penalties due; and provide each shareholder with a copy of their Schedule K-1 (Form 1120-S) by September 15.

March 15 - S-Corporation Election 

File Form 2553, Election by a Small Business Corporation, to choose to be treated as an S corporation beginning with calendar year 2021. If Form 2553 is filed late, S treatment will begin with calendar year 2022.

March 15 - Social Security, Medicare and Withheld Income Tax 

If the monthly deposit rule applies, deposit the tax for payments in February. 

March 15 - Non-Payroll Withholding

If the monthly deposit rule applies, deposit the tax for payments in February.

March 31 -  Electronic Filing of Forms 1098, 1099 and W-2G

If you file Forms 1098, 1099 (other than 1099-NEC), or W-2G electronically with the IRS, this is the final due date. This due date applies only if you file electronically (not paper forms). Otherwise, February 1 or March 1 was the due date, depending on the form filed. The due date for giving the recipient these forms was February 1.