March 2019 Business Due Dates

March 1 - Farmers and Fishermen

File your 2018 income tax return (Form 1040) and pay any tax due. However, you have until April 15 (April 17 if you live in Maine or Massachusetts) to file if you paid your 2018 estimated tax by January 15, 2019.

March 4 - Applicable Large Employer (ALE) - Form 1095-C

If you’re an Applicable Large Employer, provide the 2018 Form 1095-C, Employer-Provided Health Insurance Offer and Coverage, to full-time employees. The normal due date for giving employees their copy of the 1095-C is January 31, 2019, but the IRS gave a blanket extension of 30 days to ALEs for 2019 filings.

March 15 - Partnerships

File a 2018 calendar year return (Form 1065). Provide each partner with a copy of Schedule K-1 (Form 1065), Partner’s Share of Income, Deductions, Credits, etc., or a substitute Schedule K-1. If you want an automatic 6-month extension of time to file the return and provide Schedules K-1 or substitute Schedules K-1 to the partners, file Form 7004. Then, file Form 1065 and provide the K-1s to the partners by September 16.

March 15 - S-Corporations

File a 2018 calendar year income tax return (Form 1120S) and pay any tax due. Provide each shareholder with a copy of Schedule K-1 (Form 1120S), Shareholder’s Share of Income, Deductions, Credits, etc., or a substitute Schedule K-1 (Form 1120S). 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 1120S) by September 16.

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 2019. If Form 2553 is filed late, S treatment will begin with calendar year 2020.

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.


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