When Should I File My Taxes? Important Deadlines for 2026
Never miss a tax deadline again. Here's your complete guide to all important tax filing dates for the 2026 tax season.
Important Tax Filing Deadlines
Staying on top of tax deadlines helps you avoid penalties and interest charges.
Key Dates to Remember
| Date | Deadline | |------|----------| | January 15 | Q4 estimated tax payment due | | January 31 | W-2 and 1099 forms sent to employees/contractors | | April 15 | Individual tax return deadline (Form 1040) | | April 15 | First quarter estimated payment due | | June 15 | Second quarter estimated payment due | | September 15 | Third quarter estimated payment due | | October 15 | Extended return deadline |
What If I Can't File on Time?
You can request an automatic 6-month extension by filing Form 4868. However, an extension to file is NOT an extension to pay. You must estimate and pay any taxes owed by April 15.
Penalties for Late Filing
- Failure to file: 5% of unpaid taxes per month, up to 25%
- Failure to pay: 0.5% of unpaid taxes per month, up to 25%
- Late estimated payments: May result in underpayment penalties
Don't risk penalties. Let K2 Tax Solutions ensure you file accurately and on time.