Fiscal Year Taxpayers

If you use a fiscal year (rather than the calendar year) as your tax year, you should change some of the dates in this calendar. Use the following general guidelines to make these changes.

The 3 months that make up each quarter of a fiscal year may be different from those of each calendar quarter, depending on when the fiscal year begins. Also see Saturday, Sunday, or legal holiday.

Individuals

Form 1040. This form is due on the 15th day of the 4th month after the end of your tax year.

Estimated tax payments (Form 1040-ES). Payments are due on the 15th day of the 4th, 6th, and 9th months of your tax year and on the 15th day of the 1st month after your tax year ends.

Partnerships

Form 1065. This form is due on the 15th day of the 3rd month after the end of the partnership's tax year. Provide each partner with a copy of Schedule K-1 (Form 1065) or a substitute Schedule K-1.

Form 1065-B (electing large partnerships). This form is due on the 15th day of the 3rd month after the end of the partnership's tax year. Provide each partner with a copy of Schedule K-1 (Form 1065-B) or a substitute Schedule K-1 by the first March 15 following the close of the partnership's tax year.

Corporations

Form 1120. These forms are due on the 15th day of the 4th month after the end of the corporation's tax year.

S Corporations

Form 1120S (or Form 7004). These forms are due on the 15th day of the 3rd month after the end of the corporation's tax year. S corporations must provide each shareholder with a copy of Schedule K-1 (Form 1120S) or a substitute Schedule K-1.

Estimated tax payments. Payments are due on the 15th day of the 3rd (S Corporations), 4th (for Corporations), 6th, 9th, and 12th months of the corporation's tax year.

Form 2553. This form is used to choose S corporation treatment. It is due no more than two months and 15 days after the beginning of the tax year the election is to take effect or at any time during the preceding tax year.

March 2019
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Upcoming Tax Dates

March 1 — Farmers & fishermen
File your 2018 income tax return (Form 1040) and pay any tax due Details

March 10 — Employees who work for tips
If you received $20 or more in tips during February, report them to your employer Details

March 15 — S Corporations
File a 2018 calendar year income tax return (Form 1120S) and pay any tax due Details

March 15 — S Corporation election
File Form 2553, Election by a Small Business Corporation, to elect to be treated as an S corporation beginning with calendar year 2018. If Form 2553 is filed late, S corporation treatment will begin with calendar year 2019.

March 15 — Partnerships
File a 2018 calendar year return (Form 1065) Details

March 15 — Electing larger partnerships
Provide each partner with a copy of Schedule K1 (Form 1065B), Partner's Share of Income (Loss) From an Electing Large Partnership, or a substitute Schedule K1. This due date applies even if the partnership requests an extension of time to file the Form 1065B by filing Form 7004

March 15 — Partnerships
Electing large partnerships: File a 2018 calendar year return (Form 1065-B) Details

March 15 — Social security, Medicare, and withheld income tax
If the monthly deposit rule Page 6 Publication 509 applies, deposit the tax for payments in February.

March 31 — Electronic filing of Forms W2
File copies of all the Forms W2 you issued for 2018. This due date applies only if you electronically file.

March 31 — Electronic filing of Forms W2G
File copies of all the Forms W2G you issued for 2018. This due date applies only if you electronically file.

March 31 — Electronic filing of Forms 8027
File Forms 8027 for 2018. This due date applies only if you electronically file.

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