October 2023 Business Tax Due Dates
October 16 - Corporations
File a 2022 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 by April 18.
October 16 - Last Day to Establish a Keogh Account for 2022
If you received an automatic 6-month extension of time to file your 2022 tax return and are self-employed, October 16, 2023, is the last day to establish a Keogh Retirement Account if you plan to make a contribution for 2022.
October 16 - Taxpayers with Foreign Financial Interests
If you received an automatic 6-month extension of time to report your 2022 foreign financial accounts to the Department of the Treasury, this is the due date for Form FinCEN 114.
October 16 - Social Security, Medicare and Withheld Income Tax
If the monthly deposit rule applies, deposit the tax for payments in September.
October 16 - Nonpayroll Withholding
If the monthly deposit rule applies, deposit the tax for payments in September.
October 31 - Social Security, Medicare and Withheld Income Tax
File Form 941 for the third quarter of 2023. Deposit or pay any undeposited tax under the accuracy of deposit rules. 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 13 to file the return.
October 31 - Certain Small Employers
Deposit any undeposited tax if your tax liability is $2,500 or more for 2023 but less than $2,500 for the third quarter.
October 31 - Federal Unemployment Tax
Deposit the tax owed through September if more than $500.