Missing a tax deadline can cost you in penalties, interest, or lost credits. The IRS operates on a strict calendar, and the consequences of being late range from minor inconvenience to significant financial penalties. This complete 2026 tax deadline calendar covers every date that matters for individual taxpayers, self-employed filers, and business owners.
January 2026
January 15 — Q4 2025 Estimated Tax Payment Due
If you are self-employed, a freelancer, investor, or anyone who receives income without automatic withholding, your fourth-quarter 2025 estimated tax payment is due on January 15, 2026. This covers income earned October 1 through December 31, 2025.
Penalty for missing it: The IRS charges an underpayment penalty — currently tied to the federal short-term interest rate plus 3 percentage points. For 2026, that rate is approximately 7–8% annualized on the underpaid amount.
Exception: You can skip the January 15 payment entirely if you file your full 2025 return and pay any balance owed by January 31, 2026.
January 31 — W-2 and 1099 Forms Due to Recipients
Employers must furnish W-2 forms to employees, and businesses must send 1099-NEC forms to independent contractors who earned $600 or more. The January 31 deadline applies to:
- W-2: From employers to employees
- 1099-NEC: From businesses to contractors (nonemployee compensation)
- 1099-MISC: Certain payments (rents, prizes, etc.) — also January 31 in most cases
The same January 31 deadline applies for filing W-2s with the Social Security Administration and 1099-NECs with the IRS.
February 2026
February 18 — 1099-B, 1099-DIV, 1099-INT Due to Recipients
Brokerages and financial institutions have until February 18 to send 1099-B (proceeds from broker transactions), 1099-DIV (dividends), and 1099-INT (interest income) forms. Many brokerages send “corrected” forms in March as year-end data is reconciled — this can delay your filing if you invest in partnerships or complex securities.
March 2026
March 16 — Partnership and S-Corporation Returns Due
If you are a partner in a partnership or a shareholder in an S-corporation, the entity’s Form 1065 (partnership) or Form 1120-S (S-corp) is due March 16. These returns generate the K-1 schedules you need before you can complete your personal return.
Extension: File Form 7004 by March 16 for a 6-month extension to September 15.
April 2026
April 15 — Personal Tax Return Filing Deadline
The most well-known deadline: Form 1040 is due April 15 for most individual taxpayers. This covers your 2025 tax year return.
What is actually due on April 15 even if you file an extension:
- Any tax owed — an extension to file is not an extension to pay
- Your Q1 2026 estimated tax payment (see below)
Penalty for late filing: 5% of unpaid tax per month (up to 25%) if you owe a balance. Penalty for late payment: 0.5% per month (up to 25%) on any unpaid balance. Interest: Accrues daily on unpaid amounts from April 15 forward.
April 15 — Q1 2026 Estimated Tax Payment Due
Your first-quarter 2026 estimated tax payment covering January 1 through March 31 is also due April 15. Self-employed individuals, freelancers, investors, and anyone expecting to owe $1,000 or more in federal tax for 2026 must make this payment.
April 15 — Last Day to Contribute to an IRA for 2025
April 15 is also the final deadline to make a traditional or Roth IRA contribution that counts toward the 2025 tax year. For 2025, the contribution limit is $7,000 ($8,000 if age 50 or older). Contributing now could still reduce your 2025 taxable income if using a traditional IRA and you are eligible to deduct it.
April 15 — Extension Requests Due (Form 4868)
File Form 4868 by April 15 to receive an automatic 6-month extension to file your return, pushing the deadline to October 15, 2026. Note: this extends the filing deadline only, not the payment deadline. You must estimate and pay any taxes owed by April 15 to avoid penalties.
June 2026
June 15 — Q2 2026 Estimated Tax Payment Due
Your second-quarter estimated tax payment covering April 1 through May 31 is due June 15. (Note: the Q2 period is only two months, not three — a common source of confusion.)
Special rule for U.S. citizens and residents abroad: If you are living outside the U.S. on April 15, your filing deadline is automatically extended to June 15 (though any tax owed still accrued interest from April 15).
September 2026
September 15 — Q3 2026 Estimated Tax Payment Due
The third-quarter estimated tax payment covering June 1 through August 31 is due September 15.
September 15 — Extended Partnership and S-Corp Returns Due
If a partnership or S-corporation filed for extension in March, the extended return deadline is September 15.
October 2026
October 15 — Extended Personal Tax Return Deadline
If you filed Form 4868 in April, your final deadline to submit your 2025 personal return is October 15, 2026. After this date, no further extension is available, and late filing penalties begin.
Important: If you owe tax, interest has been accruing since April 15. File and pay as soon as possible even if before October 15.
December 2026
December 31 — Year-End Tax Action Deadlines
Several tax strategies must be completed by December 31 to count for 2026:
- Charitable contributions made by check, credit card, or appreciated securities
- Required Minimum Distributions (RMDs) for taxpayers who turned 73 before 2026 (failure to take RMDs triggers a 25% excise tax on the shortfall)
- Tax-loss harvesting — sell losing positions to offset capital gains
- Flexible Spending Account (FSA) — use it or lose it (unless your plan has a grace period or rollover)
- 529 plan contributions for state deduction purposes (varies by state)
- Business asset purchases to maximize Section 179 or bonus depreciation deductions
Full 2026 Deadline Summary
| Date | Deadline |
|---|---|
| January 15 | Q4 2025 estimated tax payment |
| January 31 | W-2 and 1099-NEC to recipients; file W-2 and 1099-NEC with IRS/SSA |
| February 18 | 1099-B, 1099-DIV, 1099-INT to recipients |
| March 16 | Partnership (1065) and S-corp (1120-S) returns due |
| April 15 | 2025 personal return (1040); Q1 2026 estimated payment; IRA contributions for 2025; extension requests (4868) |
| June 15 | Q2 2026 estimated tax payment |
| September 15 | Q3 2026 estimated tax payment; extended partnership/S-corp returns |
| October 15 | Extended personal return (1040) final deadline |
| December 31 | Year-end planning actions (RMDs, charitable giving, FSA, tax-loss harvesting) |
What Happens If You Miss a Deadline
| Situation | Penalty |
|---|---|
| Late filing with balance owed | 5% of unpaid tax per month, up to 25% |
| Late payment | 0.5% of unpaid tax per month, up to 25% |
| Both late filing and late payment | Combined, but filing penalty reduced to 4.5% |
| Failure to file (extreme) | Up to 100% of taxes owed plus potential criminal liability |
| Underpayment of estimated taxes | Interest at federal short-term rate + 3% annualized |
| Failure to distribute RMD | 25% excise tax on undistributed amount (reduced to 10% if corrected promptly) |
Key Takeaway
The April 15 filing deadline captures most of the attention, but the quarterly estimated tax deadlines on January 15, April 15, June 15, and September 15 are equally important for the tens of millions of Americans who receive income outside of traditional employment. Mark all four estimated tax dates in your calendar now, and consider using the IRS’s Electronic Federal Tax Payment System (EFTPS) to schedule payments in advance and avoid scrambling at the last minute.