Individuals - If you have an automatic 6-month extension to file your income tax return for 2018, file Form 1040 and pay any tax, interest, and penalties due.
Corporations - File a 2018 calendar year income tax return (Form 1120) and pay any tax, interest, and penalties due. This due date applies only if you timely requested an automatic 6-month extension.
Employers Nonpayroll withholding. If the monthly deposit rule applies, deposit the tax for payments in September.
Employers Social Security, Medicare, and withheld income tax. If the monthly deposit rule applies, deposit the tax for payments in September.
October 31
Employers - Social Security, Medicare, and withheld income tax. File form 941 for the third quarter of 2019. Deposit any undeposited tax. (If your tax liability is less than $2,500, you can pay it in full with a timely filed return.) If you deposited the tax for the quarter in full and on time, you have until November 12 to file the return.
Certain Small Employers - Deposit any undeposited tax if your tax liability is $2,500 or more for 2019 but less than $2,500 for the third quarter.
Employers - Federal Unemployment Tax. Deposit the tax owed through September if more than $500.
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