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Tax Filing Deadlines 2026: Every Important Date
Tax information is for educational purposes only and does not constitute tax advice. Consult a licensed tax professional for your specific situation.
Missing a tax deadline can result in penalties, interest charges, and unnecessary stress. This guide covers every important tax date for 2026, from information return deadlines to individual and business filing dates.
2026 Tax Deadline Calendar
January 2026
| Date | Deadline |
|---|
| January 15 | Q4 2025 estimated tax payment due |
| January 31 | Employers must send W-2s to employees |
| January 31 | Businesses must send 1099-NEC forms to contractors |
| January 31 | 1099-K forms sent by payment platforms |
February 2026
| Date | Deadline |
|---|
| February 17 | Form W-4 exemption renewal (for employees claiming exempt withholding) |
| February 28 | Paper filing deadline for 1099 and W-2 forms with IRS/SSA |
March 2026
| Date | Deadline |
|---|
| March 16 | S Corporation (Form 1120-S) returns due |
| March 16 | Partnership (Form 1065) returns due |
| March 16 | Last day to file S Corp/Partnership extension (Form 7004) |
| March 31 | Electronic filing deadline for 1099 forms with IRS |
April 2026
| Date | Deadline |
|---|
| April 15 | Individual tax returns (Form 1040) due |
| April 15 | C Corporation (Form 1120) returns due |
| April 15 | Trust and estate returns (Form 1041) due |
| April 15 | Q1 2026 estimated tax payment due |
| April 15 | Last day to file individual extension (Form 4868) |
| April 15 | Last day to make 2025 IRA contributions |
| April 15 | Last day to make 2025 HSA contributions |
| April 15 | FBAR (FinCEN Form 114) due (auto-extension to October 15) |
May 2026
| Date | Deadline |
|---|
| May 15 | Tax-exempt organization (Form 990) returns due |
June 2026
| Date | Deadline |
|---|
| June 16 | Q2 2026 estimated tax payment due |
| June 15 | Individual returns due for U.S. citizens living abroad (automatic 2-month extension) |
September 2026
| Date | Deadline |
|---|
| September 15 | Extended S Corporation and Partnership returns due |
| September 15 | Q3 2026 estimated tax payment due |
| September 15 | Last day for SEP IRA contributions (if extension was filed for sole proprietorship) |
October 2026
| Date | Deadline |
|---|
| October 15 | Extended individual returns (Form 1040) due |
| October 15 | Extended C Corporation returns due |
| October 15 | Extended trust and estate returns due |
| October 15 | FBAR final deadline (after automatic extension) |
January 2027
| Date | Deadline |
|---|
| January 15 | Q4 2026 estimated tax payment due |
Key Deadlines at a Glance
| Return Type | Regular Deadline | Extended Deadline |
|---|
| Individual (Form 1040) | April 15, 2026 | October 15, 2026 |
| S Corporation (Form 1120-S) | March 16, 2026 | September 15, 2026 |
| Partnership (Form 1065) | March 16, 2026 | September 15, 2026 |
| C Corporation (Form 1120) | April 15, 2026 | October 15, 2026 |
| Trust/Estate (Form 1041) | April 15, 2026 | October 15, 2026 |
| Nonprofit (Form 990) | May 15, 2026 | November 16, 2026 |
Filing Extensions
What an Extension Does
- Gives you an additional 6 months to file your return
- Does not extend the time to pay — you must estimate and pay any tax owed by the original deadline
How to File an Extension
| Return Type | Extension Form |
|---|
| Individual | Form 4868 |
| S Corp / Partnership / C Corp | Form 7004 |
| Trust / Estate | Form 7004 |
Most tax software can file the extension electronically. You can also submit a payment with a note indicating it is for an extension, which the IRS will accept as an extension request.
Extension Penalties
- No penalty for filing an extension if you pay at least 90% of your tax by the original deadline
- Failure-to-pay penalty: 0.5% per month on unpaid tax (even with an extension)
- Interest: Charged on unpaid tax from the original deadline
Penalties for Missing Deadlines
| Violation | Penalty |
|---|
| Failure to file (no extension) | 5% of unpaid tax per month, up to 25% |
| Failure to pay | 0.5% of unpaid tax per month, up to 25% |
| Both penalties combined | Maximum of 5% per month total for first 5 months |
| Failure to pay estimated taxes | Federal short-term rate + 3% (approximately 8%) |
| Late W-2 / 1099 filing (businesses) | $60–$310 per form, depending on lateness |
Critical: The failure-to-file penalty is 10 times larger than the failure-to-pay penalty. Always file on time (or file an extension), even if you cannot pay.
Estimated Tax Payment Schedule
| Payment | Period Covered | Due Date |
|---|
| Q1 | January – March | April 15, 2026 |
| Q2 | April – May | June 16, 2026 |
| Q3 | June – August | September 15, 2026 |
| Q4 | September – December | January 15, 2027 |
See Quarterly Estimated Tax Payments: When and How Much for calculation methods and safe harbor rules.
State Filing Deadlines
Most states follow the federal April 15 deadline, but some differ:
| State | Individual Deadline | Notes |
|---|
| Most states | April 15 | Same as federal |
| Virginia | May 1 | 2 weeks later than federal |
| Louisiana | May 15 | 1 month later than federal |
| Iowa | April 30 | 2 weeks later than federal |
Check State Income Tax Comparison: All 50 States Ranked for your state’s specific requirements.
Key Takeaways
- April 15 is the primary individual filing deadline; March 16 is the deadline for S Corps and partnerships
- Extensions give you 6 extra months to file but do not extend the time to pay
- The failure-to-file penalty (5% per month) is far steeper than the failure-to-pay penalty (0.5% per month)
- Always file on time or file an extension, even if you cannot pay in full
- Quarterly estimated payments are due April 15, June 16, September 15, and January 15
- IRA and HSA contributions for the prior year must be made by April 15
Next Steps