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September 5 — Everyone
Federal Holiday (Labor Day) Details
September 10 — Employees who work for tips
If you received $20 or more in tips during August, report them to your employer Details
September 15 — Individuals
Make a payment of your 2018 estimated tax if you are not paying your income tax for the year through withholding (or will not pay in enough tax that way). Use Form 1040-ES. This is the third installment Details
September 15 — S Corporations
File a 2017 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 Details
September 15 — Partnerships
File a 2017 calendar year return (Form 1065). This due date applies only if you were given an additional 5-month extension Details
September 15 — Corporations
Deposit the third installment of estimated income tax for 2017 Details
September 15 — Social security, Medicare, and withheld income tax
If the monthly deposit rule applies, deposit the tax for payments in August.