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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.