October 15 – CorporationsFile a 2019 calendar year income tax return (Form 1120 or 1120-A) and pay any tax, interest, and penalties due. This due date applies only if you timely requested an additional 3-month extension by July 15th.October 15 – Taxpayers with Foreign Financial Interests
If you received an automatic 6-month extension of time to report your 2019 foreign financial accounts to the Department of the Treasury, this is the due date for Form FinCEN 114.
October 15 – Social Security, Medicare and withheld income tax If the monthly deposit rule applies, deposit the tax for payments in September. October 15 – Nonpayroll Withholding If the monthly deposit rule applies, deposit the tax for payments in September.