Looking for your tax “to-do list” for 2026? When dealing with IRS, there are important tax deadlines throughout the year. Here are a few key dates for 2026 to keep you in the know. For a more comprehensive list of dates and deadlines for individuals and businesses, read IRS Publication 509.

January 15 – Final estimated tax payment of 2025 due 

January 26 – Tax filing season begins 

February 2 – Due date for employers to provide annual income information (e.g., Forms W-2 or 1099) 

February 17 – Deadline to file form W-4 to maintain exemption for tax withholding 

March 16 – Partnerships and S corporations file 2025 calendar year returns 

April 15 – Individual taxes due, or request for extension of time to file 

April 15 – First estimated tax of 2026 due  

June 15 – Individual taxes due for citizens and resident aliens living and working outside the U.S. 

June 15 – Second quarter estimated taxes due 

September 15 – Third quarter estimated taxes due 

October 15 – Tax due date for individuals who filed for an extension  

December 31 – Deadline for required minimum distributions for retirement accounts 

January 15, 2027 – Final estimated tax payment of 2026 due 

Taxpayers affected by disasters may be eligible for relief, including extensions of time to file. Visit Tax Relief in Disaster Situations for more information.  

If you are experiencing tax issues causing a financial hardship, TAS may be able to help. Visit our Qualifier Tool for more information.  

All taxpayers have rights when dealing with the IRS. Learn more about the Taxpayer Bill of Rights.