By 
The third quarter estimated tax payment deadline is September 15, 2026. If you are self-employed, a freelancer, or have significant investment income without withholding, you need to make a payment by that date to avoid underpayment penalties. Here is exactly what to pay and how to pay it in under 5 minutes.
Who Needs to Pay
You need to make a Q3 estimated tax payment if you expect to owe at least $1,000 in federal income tax for 2026 and your withholding will not cover at least 90% of your 2026 liability or 100% of your 2025 tax bill (110% if your 2025 AGI exceeded $150,000).
This applies to: self-employed individuals, freelancers, gig workers, investors with capital gains or dividends, rental income earners, and anyone with significant income not subject to employer withholding.
The 2026 Estimated Tax Payment Schedule
| Quarter | Income Period | Due Date | Status |
|---|---|---|---|
| Q1 | January 1 – March 31 | April 15, 2026 | Past |
| Q2 | April 1 – May 31 | June 15, 2026 | Past |
| Q3 | June 1 – August 31 | September 15, 2026 | Due in 2 weeks |
| Q4 | September 1 – December 31 | January 15, 2027 | Upcoming |
How Much to Pay
The simplest method: divide your total 2025 federal tax (Form 1040, line 24) by four. Pay that amount each quarter. This is the safe harbor method — as long as you pay 100% of last year’s tax across all four quarters (110% if 2025 AGI was over $150,000), you avoid underpayment penalties regardless of what you actually owe in April 2027.
If you did not pay Q1 or Q2, you can catch up by paying more in Q3 and Q4 to still meet the annual safe harbor threshold.
How to Pay in Under 5 Minutes
- Go to irs.gov/payments/direct-pay
- Select “Estimated Tax” as the reason
- Select tax form “1040-ES” and tax year “2026”
- Enter your bank account details and payment amount
- Submit before September 15 at midnight Eastern
Free, instant, no account needed. Save the confirmation number.
What Happens If You Miss September 15
Missing the deadline triggers an underpayment penalty calculated at approximately 7-8% annualized on the amount owed from June 15 to September 15 — roughly $22-$24 on a $1,000 underpayment for the quarter. Not catastrophic, but avoidable with a 5-minute payment.
The penalty is calculated on IRS Form 2210 when you file your annual return. You can also apply for a waiver if the underpayment was due to unusual circumstances.
OBBBA Notes for 2026
If you received tip income or FLSA overtime in 2026, the One Big Beautiful Bill Act created deductions for both. If these deductions reduce your taxable income significantly compared to 2025, you may owe less in Q3 than the safe harbor calculation suggests. Factor any new OBBBA deductions into your estimate before paying more than necessary.
Sources: IRS Publication 505; IRS Form 1040-ES instructions 2026. This article is for informational purposes only and does not constitute tax advice.
