Business tax due dates vary depending on the type of business and tax being filed, but the key 2025 deadlines in the United States include:
- March 15, 2025: Deadline for Partnerships and S Corporations to file their 2024 tax returns or request an extension.
- April 15, 2025: Deadline for sole proprietors to file Schedule C, and for C Corporations to file their 2024 tax returns or request an extension.
- September 15, 2025: Extended deadline for Partnerships and S Corps to file their 2024 returns if an extension was requested; also the deadline for estimated tax payments for the third quarter.
- October 15, 2025: Extended deadline for sole proprietors and C Corporations to file their 2024 tax returns if an extension was requested.
Estimated tax payments for corporations on a calendar year are generally due April 15, June 15, September 15, and December 15. Employment taxes, sales taxes, and excise taxes have varied due dates, often monthly or quarterly.
For business taxes filed annually, the return is due on the 15th day of the 4th month following the end of the fiscal year, typically April 15 for calendar-year businesses.
Thus, business tax due dates in 2025 revolve mainly around March 15, April 15, September 15, and October 15 depending on entity type and extensions.
