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Key Business Tax Deadlines for January 2026

As January 2026 approaches, it's important for business owners, employers, farmers, and fishermen to stay aware of crucial tax deadlines. Early planning can help keep your business compliant and prevent penalties.

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January 15 - Employer’s Monthly Deposit Obligation

For employers adhering to the monthly deposit rule, January 15 is your deadline to deposit Social Security, Medicare, and withheld income tax for December 2025. Nonpayroll withholding deposits for December 2025, if under the monthly deposit criteria, are also due. Ensure all employment tax deposits are made electronically unless your deposit liability for a return period is below $2,500, in which case quarterly or annual payments with the return are permissible.

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January 15 - Farmers and Fishermen

Submit your estimated tax for 2025 using Form 1040-ES. Although you have until April 15 to file your 2025 income tax return (Form 1040 or Form 1040-SR), failing to pay the estimated tax by January 15 requires you to file your 2025 tax return and pay any due taxes by March 2, 2026, to avoid incurring an estimated tax penalty.

Weekends & Holidays

If a filing deadline lands on a Saturday, Sunday, or legal holiday, it automatically shifts to the next business day that isn’t a legal holiday.

Extensions in Disaster Areas

Designated disaster areas receive extended deadlines. To find out if your area qualifies and get details on new filing dates, visit the following resources:

FEMA: https://www.fema.gov/disaster/declarations
IRS: https://www.irs.gov/newsroom/tax-relief-in-disaster-situations

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