Missing tax deadlines can have significant consequences. Did you know the IRS collects billions of dollars every year in penalties? Staying on top of tax obligations not only avoids unnecessary costs but also keeps your business in good standing with tax authorities, lenders and investors. Use this guide to stay informed about key deadlines for the 2025 tax year, and let us know if you need assistance in meeting them.

A complete list can also be found at the IRS website as well as an online tax calendar.  

Here are some of the important tax deadlines in 2025 business owners should know: 

Jan. 15, 2025 

  • Fourth Quarter 2024 estimated tax payment due 
  • Farmers and fisherman pay 2024 estimated tax payment unless filing and paying all tax by March 3, 2025.  

Jan. 31, 2025 

  • Provide Form 1098, Form 1099-MISC, Form 1099-NEC and form W-2 to recipients 
  • File annual return of federal unemployment taxes (Form 940) and pay any tax due 
  • File Form W-3 transmittal of wages and tax statements along with forms W2 issued 
  • File Form 1099-NEC and Form 1096 for nonemployee compensation paid in 2024 

Feb. 28, 2025 

  • File form 1098, form 1099, form W-2G and transmittal Form 1096 for interest, dividends and miscellaneous payments made during 2024. 

March 3, 2025 

  • Farmers and fisherman due date for Form 1040 and pay all tax due if did not pay 2024 estimated tax by Jan. 15, 2025.  

March 15, 2025 

  • Taxes due for partnerships, multi-member LLCs and S-Corporations 
  • S Corporations: file a 2024 income tax return (Form 1120S) or file for a six-month extension 
  • Partnerships: file a 2024 income tax return (Form 1065 or 1065-B) or file for a six-month extension  
  • S Corporation election: file form 2553 to elect to be treated as an S Corporation beginning with calendar year 2025.  

April 15, 2025

  • Taxes are due for individuals or file for an automatic six-month extension. Pay what you estimate you owe in tax to avoid penalties and interest.
  • Taxes are due for calendar year end 2024 C-Corporations or file for an automatic six-month extension  
  • Corporations: Pay the first installment of 2025 estimated income taxes
  • Tax Exempt Organizations: deposit Estimated Tax for first quarter due on Unrelated Business Taxable Income for Tax-Exempt Organizations (Form 990-W) 
  • Trusts and Estates: File income tax return for 2024 calendar year (Form 1041) or file for a five-and-a-half-month extension to Oct. 1 and pay any income tax due 

June 16, 2025 

  • Form 1040 due for U.S. citizens or resident alien living and working (or on military duty) outside the United States.  
  • Corporations: Pay the second installment of 2025 estimated income taxes 
  • Individuals: Pay the second installment of 2025 estimated income taxes.  
  • Tax Exempt Organizations: Deposit Estimated Tax for 2nd quarter due on Unrelated Business Taxable Income for Tax-Exempt Organizations  

Sept. 15, 2025 

  • Deadline for extended partnership and S-corporation returns 
  • Individuals: Pay the third installment of 2025 estimated income taxes. 
  • Corporations: Pay the third installment of 2025 estimated income taxes 
  • Tax Exempt Organizations: Deposit Estimated Tax for 3rd quarter due on Unrelated Business Taxable Income for Tax-Exempt Organizations

Oct. 15, 2025 

  • Deadline for extended 2024 calendar C-corporation returns 
  • Deadline for extended 2024 Individual returns.  

Nov. 17, 2025

  • Exempt Organizations: Filing a 2024 calendar-year information return (Form 990, Form 990-EZ or Form 990-PF) and pay any tax, interest and penalties due, if a six-month extension was previously filed 

Dec. 15, 2025

  • Corporations: Pay the fourth installment of 2024 estimated income taxes 
  • Tax Exempt Orgs: Deposit Estimated Tax for fourth quarter due on Unrelated Business Taxable Income for Tax-Exempt Organizations  

Why are these deadlines so important? 

Understanding and meeting tax deadlines are vital for several reasons:

  • Avoid Penalties & Interest: Failing to file or pay taxes on time can result in costly penalties and interest. These charges can quickly add up, eating into your profits unnecessarily.
  • Maintain Good Standing with Tax Authorities: Timely compliance demonstrates responsibility and builds trust with tax authorities, which can be important in the event of an audit or future interactions.
  • Improve Budgeting & Financial Planning: Knowing your deadlines allows you to better plan for tax liabilities, manage cash flow and allocate resources efficiently.
  • Protect Credit & Financial Reputation: For businesses, tax compliance impacts your financial standing. Lenders and investors often review tax records to assess risk and reliability.

To get the most accurate and current information about the 2025 tax deadlines for businesses, contact an Adams Brown advisor. We can provide you with specific deadlines and requirements based on your business structure and location.