Key Tax Deadlines for US Businesses in 2025

Overview of 2025 US Federal Tax Deadlines

Staying on top of tax filing obligations is critical for businesses operating in the United States. Missing deadlines can lead to penalties and interest that quickly add up.

Important Dates

• January 31 – Form W-2 and 1099-NEC to employees and contractors
• March 15 – Form 1120-S and 1065 for S-corps and partnerships (calendar year)
• April 15 – Form 1120 for C-corporations (calendar year) and federal estimated tax payment Q1
• June 17 – Estimated tax payment Q2
• September 16 – Estimated tax payment Q3 and extended deadline for S-corps/partnerships
• October 15 – Extended deadline for C-corporations
• December 31 – Year-end payroll and tax planning actions

State deadlines may vary, so always verify with your local revenue department.