🧾 Business Tax Deadlines: Key Dates for Every Business Type in 2025

Whether you’re running a one-person show or managing a growing team, missing a business tax deadline can cost you time, money, and peace of mind. Different business structures come with different filing requirements—so it’s essential to know what form applies to you and when it’s due.

Here’s a breakdown of the 2025 business tax deadlines by entity type:

👤 Sole Proprietors & Single-Member LLCs

Form 1040 + Schedule C

• 🗓️ April 15, 2025 – Main filing deadline
• 📂 October 15, 2025 – Extension deadline (Form 4868)
  Even though you’re running a business, your income is reported through your personal return. That means Schedule C is due alongside Form 1040.

💡 Tip: Still eligible to contribute to an IRA or HSA by April 15 to lower your tax bill.

👥 Partnerships & Multi-Member LLCs

Form 1065 – U.S. Return of Partnership Income\

• 🗓️ March 17, 2025 – Main filing deadline
• 📂 September 15, 2025 – Extension deadline (Form 7004)
  Each partner receives a Schedule K-1, which they’ll need to report on their personal tax return.

📘 Tip: File early so your partners have their K-1s in time for their own returns!

🏢 S Corporations

Form 1120-S – U.S. Income Tax Return for an S Corporation\

• 🗓️ March 17, 2025 – Main filing deadline
• 📂 September 15, 2025 – Extension deadline (Form 7004)
  Just like partnerships, S corps issue K-1s to shareholders, so timely filing is key.

🏦 C Corporations

Form 1120 – U.S. Corporation Income Tax Return

• 🗓️ April 15, 2025 – Main filing deadline
• 📂 October 15, 2025 – Extension deadline (Form 7004)
  C corps are taxed separately from the owners, and they’re responsible for paying corporate income tax.

🔁 Fiscal year filer? Your deadline is the 15th day of the 4th month after your fiscal year ends.

💼 Other Deadlines to Remember

• Quarterly Estimated Payments – Due April 15, June 17, Sept 16, and Jan 15 (2026)
• W-2s & 1099s – Due to recipients by Jan 31, 2025
• Payroll Tax Deposits – Vary based on your payroll schedule (monthly/semi-weekly)

🧾 Business Tax Deadline Recap:

✨ Stay Ahead of the IRS

Don’t rely on memory. Download Taylor’s Toolkit Tax Deadline Calendar (coming soon!) to stay ahead all year long.