Business 1120S Edition

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S-Corporations

March 15

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. If you want an automatic 6-month extension of time to file the return, file Form 7004 and deposit what you estimate you owe.

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

September 15

File a 2018 calendar year income tax return (Form 1120S) and pay any tax due. This due date applies only if you timely requested an automatic 6-month extension. Otherwise, see March 15. Provide each shareholder with a copy of Schedule K-1 (Form 1120S) or a substitute Schedule K-1.

If you operate on a fiscal year, see tax calendar information for Fiscal-Year Taxpayers.

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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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