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October 2025 Essential Business Tax Deadlines

With the arrival of October, businesses must brace for significant tax deadlines amidst the cool fall breeze. From corporate filings and payroll submissions to contributions for retirement plans, it's crucial to mark these dates to avoid costly penalties and ensure compliance.

October 15 - Corporate Tax Returns

Corporations that filed for an automatic 6-month extension by April 15 must submit their 2024 calendar year income tax return (Form 1120) on this date, along with any applicable taxes, interest, and penalties.

October 15 - Payroll Tax Deposits

Employers adhering to monthly deposit rules should deposit Social Security, Medicare, and withheld income taxes for September 2025 by October 15. Additionally, this date serves as the deadline for nonpayroll withholding deposits if the monthly deposit rule is applicable.

October 15 - Nonpayroll Tax Deposits

Ensure you deposit taxes imposed on payments made in September, if required by the monthly deposit rule.

October 15 - Keogh Account Setup Deadline

Self-employed individuals who've been granted a 6-month filing extension for their 2023-2024 tax returns have until this date to establish a Keogh Retirement Account for the 2024 tax year.

October 15 - SEP IRA & Keogh Contributions

This marks the last day to contribute to a SEP or Keogh plan for individuals who have extended their tax return filings to October 15.

October 31 - Payroll Tax Filing and Payments

File Form 941 for Q3 2025 by this date, and make any necessary tax deposits according to the accuracy of deposit rules. If your total tax liability is under $2,500, consider paying in full with your timely filed return. If you've already deposited all due taxes for the quarter promptly, you have until November 10 to file your return.

October 31 - Small Employer Tax Deposits

Small employers with a total annual tax liability of $2,500 or more but under $2,500 for the quarter should deposit any outstanding taxes by this day.

October 31 - Federal Unemployment Tax Deposits

Pay the accumulated Federal Unemployment Tax by this date for amounts exceeding $500 through September.

Handling Weekends & Holidays:

If a due date lands on a weekend or a public holiday, it will automatically extend to the next business day that isn’t a holiday.

Extensions for Disaster Areas:

Tax filing and payment deadlines extend if your region is recognized as a disaster area. For more information about such designations and extensions, visit these resources:
FEMA: FEMA Disaster Declarations
IRS: IRS Tax Relief in Disaster Situations

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