October 12, 2021
Employees – who work for tips. If you received $20 or more in tips during September, report them to your employer. You can use Form 4070.
October 15, 2021
Individuals – If you have an automatic 6-month extension to file your income tax return for 2020, file Form 1040 or Form 1040-SR and pay any tax, interest, and penalties due.
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.
Corporations – File a 2020 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.