2025 Tax Deadlines for Small Businesses

Ready to mark up your calendars? Here are a few important tax deadlines that small business owners and self-employed individuals should remember in 2025.



The IRS and States will begin accepting tax returns on January 27, 2025.

Filing Deadlines

Filing Deadlines:

S Corp and Partnerships:  March 17

1040 and Schedule C:  April 15 

Extensions:

The above dates are also the deadlines to file an extension. Extension can be filed for free using the IRS Free File program, or by mailing in your forms, but they must be postmarked by the date above. Remember that an extension is an extension to file NOT to pay. 

Payment Deadlines

Income tax is considered a "pay as you go" tax. If you don’t have taxes withheld from your paycheck like a W-2 employee, you should be making Estimated Tax Payments (sometimes referred to colloquially as "quarterlies") throughout the year.

Estimated Tax Payments:

Q1  April 15

Q2 June 16

Q3  Sept 15

Q4  January 16, 2026

If you don’t make Estimated Tax Payments you will be charged a penalty, which is based on the amount you owe when you file.

As always, if you are looking for a tax professional to help with your business tax preparation, contact our office to learn more!