If you’re wondering “when do businesses file taxes?”, the answer depends on your business structure. Each type—LLC, sole proprietorship, partnership, or corporation—has a different tax deadline set by the IRS.
Business Tax Deadlines by Entity Type
Sole Proprietorships & Single-Member LLCs
- Tax Form: Schedule C with your personal 1040
- Due Date: April 15 (same as individual tax returns)
Partnerships & Multi-Member LLCs
- Tax Form: Form 1065
- Due Date: March 15
S Corporations
- Tax Form: Form 1120-S
- Due Date: March 15
C Corporations
- Tax Form: Form 1120
- Due Date:
- April 15 if the fiscal year ends December 31
- If using a fiscal year, taxes are due on the 15th day of the 4th month after year-end
What If You Need More Time?
You can file for a tax extension using:
- Form 7004 (business entities)
- Form 4868 (individuals & sole proprietors)
This grants an extra 6 months, but it does not delay payment—interest and penalties apply if taxes are owed.
Final Tips
- Mark your calendar with the correct deadline based on your business type.
- File early to avoid IRS penalties.
- Use professional tax help if unsure of your filing classification.
