By 
The Q4 2026 estimated tax payment is due Friday, January 15, 2027. It covers income you earned from September 1 through December 31, 2026, and it’s the last chance to pay 2026 tax before the IRS starts counting underpayment penalties toward your spring filing. If you freelance, run a side hustle, sell investments, or earn any income without withholding, this deadline is yours.
KEY TAKEAWAYS
- Deadline: Friday, January 15, 2027, for income earned September through December 2026.
- You generally owe estimated taxes if you expect to owe $1,000 or more for 2026 after subtracting withholding and credits.
- Safe harbor: pay 90% of your 2026 tax, or 100% of your 2025 tax (110% if your 2025 AGI was over $150,000), and you avoid the underpayment penalty regardless of what you end up owing.
- Skip option: if you file your full 2026 return and pay everything you owe by February 1, 2027, you can skip the January 15 payment entirely.
Who Has to Make the Q4 Payment?
You generally need to pay estimated taxes if both of these are true: you expect to owe at least $1,000 for 2026 after withholding and credits, and your withholding won’t cover the safe harbor amounts below. In practice, that catches:
- Freelancers and gig workers with 1099 income and no employer withholding. (Full walkthrough: how to file taxes as a gig worker in 2027.)
- Side hustlers with a W-2 day job whose paycheck withholding doesn’t cover the extra income. Our side hustle taxes guide covers when the side income tips you into paying quarterly.
- Investors with large capital gains, dividends, or interest during the fall.
- Retirees and landlords with pension, rental, or IRA income that isn’t withheld enough.
If a W-2 job withholds most of your tax and your side income is small, you may owe nothing extra in January. Run the numbers before paying: overpaying is an interest-free loan to the IRS until your refund arrives.
How Much Should You Pay? (The Safe Harbor Rules)
The IRS doesn’t expect you to predict your tax bill perfectly. You avoid the underpayment penalty if your total 2026 payments (withholding plus all four estimated payments) reach any of these thresholds:
| Safe harbor | You’re penalty-free if you paid | Best for |
|---|---|---|
| 90% of current year | 90% of your actual 2026 tax | Income dropped vs 2025 |
| 100% of prior year | 100% of your 2025 total tax | Income steady or rising, 2025 AGI ≤ $150,000 |
| 110% of prior year | 110% of your 2025 total tax | 2025 AGI over $150,000 ($75,000 married filing separately) |
The prior-year safe harbors are the easy button: your 2025 total tax is a fixed number on last year’s return (line 24 of Form 1040), so divide it by four and there’s no forecasting involved. Quick Q4 math: take your safe harbor target, subtract what you’ve already paid through withholding and your April, June, and September payments, and pay the rest by January 15. The IRS’s own worksheet is on Form 1040-ES.
One 2026 wrinkle worth knowing: the new OBBBA deductions (no tax on tips, no tax on overtime, the car loan interest deduction) may shrink what you actually owe for 2026. If they apply to you, the 90%-of-current-year route could mean a smaller January payment. Our guide to the new OBBBA deductions covers who qualifies.
A 5-Minute Worked Example
Say you’re single, you made $65,000 at a W-2 job in 2026 with $7,200 withheld, and your side hustle netted $18,000 with nothing withheld. Your 2025 return (line 24) showed total tax of $11,800, and your 2025 AGI was under $150,000, so your safe harbor is 100% of 2025 = $11,800.
- Paid so far: $7,200 withholding + $1,200 in each of the April, June, and September estimated payments = $10,800.
- Safe harbor target: $11,800.
- Q4 payment due January 15: $1,000.
Notice what you didn’t need: any forecast of your actual 2026 bill. Even if the side hustle grew and your real 2026 tax lands at $14,000, hitting the $11,800 prior-year safe harbor means no underpayment penalty; you simply pay the remaining balance when you file in April. Self-employment tax (the 15.3% Social Security and Medicare share on net side income) is part of the tax these payments cover, so freelancers with no W-2 withholding should run this same math with all four quarterly payments doing the work. Our freelancer taxes guide walks through the full self-employment calculation.
How Do You Pay the IRS?
- IRS Direct Pay (free, from a bank account): the fastest route at IRS.gov/payments. Choose “Estimated Tax” and tax year 2026.
- IRS Online Account: pay and see your full payment history, useful for confirming what you already paid in April, June, and September.
- EFTPS: the Treasury’s system, better for scheduling payments in advance.
- Debit/credit card or digital wallet: works, but processors charge a fee, so a card only makes sense if the rewards beat the fee.
- Mail: a check with the Form 1040-ES voucher, postmarked by January 15, 2027.
Don’t forget your state: most states with income tax have their own Q4 estimated payment due the same week, paid separately through your state’s tax portal.
What Happens If You Miss January 15?
The IRS charges an underpayment penalty that works like interest on the amount you should have paid, accruing from the missed due date until you pay. It’s not a flat fine, so paying even a few weeks late is cheaper than waiting until you file in April. If you realize in late January that you missed it, just pay as soon as possible.
There’s also a legal escape hatch: if you file your complete 2026 return and pay the entire balance by February 1, 2027 (the deadline is normally January 31, which falls on a Sunday), you can skip the Q4 estimated payment with no penalty for that quarter. Realistic only if your documents arrive early, but if you’re a freelancer with clean books, filing fast kills two deadlines with one stone. See when to file your 2026 taxes for the season’s full calendar.
FAQ
When is the Q4 2026 estimated tax payment due?
Friday, January 15, 2027. It covers income earned from September 1 through December 31, 2026.
Who has to pay quarterly estimated taxes?
Generally, anyone who expects to owe $1,000 or more for the year after withholding and credits, most often freelancers, gig workers, and investors with income that has no withholding.
What is the safe harbor for 2026 estimated taxes?
Pay 90% of your actual 2026 tax, or 100% of your 2025 total tax (110% if your 2025 AGI exceeded $150,000), through withholding and quarterly payments, and you owe no underpayment penalty.
Can I skip the January 15 payment?
Yes, if you file your complete 2026 return and pay everything you owe by February 1, 2027. Otherwise, pay by January 15 to avoid the penalty.
Do states have a Q4 estimated payment too?
Most states with an income tax do, typically due the same mid-January week. Check your state’s revenue department site.
Bottom Line
If you earned untaxed income this fall, put January 15, 2027 on your calendar now: pay enough to hit your safe harbor (90% of 2026, or 100-110% of 2025) and the IRS penalty clock never starts. Five minutes on IRS Direct Pay beats an interest charge that grows until April.
This article is for general information, not tax advice. Estimated taxes depend on your full income picture, so when in doubt, a CPA or tax professional can pin down your exact safe harbor number.
