Quarterly estimated taxes for the 2026 tax year are due on April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027. If you are reading this in early September, the date that matters is September 15: it covers the income you earned from June through August, and the IRS starts charging an interest-style penalty from the day a payment is missed, not from next April.
This guide covers all four federal due dates, the weekend and holiday rule, who has to pay, the safe harbor rules that make the amounts predictable, and exactly how to send the money. State dates live in our state tax deadlines index, and you can get your personal federal number in about two minutes with the free quarterly tax calculator.
1. The four 2026 quarterly tax due dates
- Q1: April 15, 2026, covering income earned January 1 through March 31, 2026
- Q2: June 15, 2026, covering income earned April 1 through May 31, 2026
- Q3: September 15, 2026, covering income earned June 1 through August 31, 2026
- Q4: January 15, 2027, covering income earned September 1 through December 31, 2026
Notice that the payment periods are not even quarters. The second period is only two months long, which is why June 15 is the most commonly missed date on the calendar: it arrives two months after the April payment, not three. The fourth period is four months long and its payment lands in the following calendar year.
There is one escape hatch on the last date. You can skip the January 15, 2027 installment entirely if you file your complete 2026 return and pay everything you owe by the start of February 2027. The end-of-January cutoff shifts to Monday, February 1, because January 31, 2027 falls on a Sunday. Few people actually file that fast, but if you do, the fourth voucher never comes due.
2. The weekend and holiday rule
When a federal due date lands on a Saturday, Sunday, or legal holiday, it moves to the next business day. None of the four dates for tax year 2026 shift: April 15 is a Wednesday, June 15 is a Monday, September 15 is a Tuesday, and January 15, 2027 is a Friday. The rule still matters this year in other places. The S corporation and partnership filing deadline moved from Sunday, March 15 to Monday, March 16, 2026, and the same rule applies to state due dates that fall on their own holidays.
3. Who has to pay quarterly taxes
The trigger is simple: if you expect to owe $1,000 or more in federal tax for 2026 after subtracting withholding and refundable credits, the IRS generally requires you to pay as the year goes, in four installments. In practice that means anyone with meaningful income that has no tax withheld from it:
- Freelancers, consultants, and contractors paid on 1099s
- Creators earning brand deal fees, ad revenue, affiliate payouts, and digital product sales
- Owners of S corporations and partnerships, whose pass-through profit on Schedule K-1 arrives with zero withholding even when their W-2 salary is withheld correctly
- Landlords, and investors with large capital gains, dividends, or crypto sales
- W-2 employees with a side business, when the side income is big enough that paycheck withholding no longer covers the total bill
Withholding gets one special privilege: the IRS treats it as paid evenly through the year no matter when it actually happened. A December increase in paycheck withholding can therefore cure an underpayment from the spring, while a December estimated payment cannot. Full mechanics are in our glossary entry on quarterly estimated taxes.
4. The safe harbor rules: 90%, 100%, or 110%
You do not have to predict your 2026 income perfectly. Under IRC Section 6654(d), no underpayment penalty applies if your timely payments and withholding add up to at least the smaller of:
- 90% of your 2026 tax, the current-year standard, or
- 100% of your 2025 total tax, rising to 110% if your 2025 adjusted gross income was over $150,000 ($75,000 if married filing separately)
The prior-year safe harbor is the planning workhorse, because last year's tax is a known number: take line 22 of your 2025 return, apply 100% or 110%, divide by four, and pay on schedule. If 2026 turns out much bigger, the extra tax is simply due with your return next April, penalty free. The reverse also matters: in a down year, 90% of the smaller current-year tax is the cheaper target, and paying 110% of a big prior year just hands the IRS an interest-free loan. The full decision tree is in our safe harbor glossary entry.
5. How to pay quarterly taxes
Every payment method needs the same three labels: the payment type is estimated tax, the form is 1040-ES, and the tax year is 2026. Misapplied payments, posted to the wrong year or the wrong spouse's account, are a recurring source of phantom IRS balances.
- IRS Direct Pay at irs.gov/payments: pulls from a bank account, no fee, no enrollment. Choose "Estimated Tax" as the reason, apply it to Form 1040-ES for tax year 2026, and save the confirmation number.
- Your IRS Online Account: same rails as Direct Pay, plus a running history of every payment you have made, which is the record your preparer will ask for in April.
- EFTPS at eftps.gov: the Treasury's payment system. It requires enrollment with a PIN that arrives by mail, so set it up before a deadline week, but it lets you schedule all four payments for the year in one sitting.
- Debit or credit card and digital wallets: through the processors linked from irs.gov/payments, for a processing fee.
- Mail: a check with the paper Form 1040-ES voucher, postmarked by the due date. Use it only when nothing electronic is available; there is no confirmation and no proof beyond your mailing receipt.
Estimated payments are never reported back to you on any January tax form, so your own log of dates, amounts, and confirmation numbers is the only complete record when your return is prepared.
6. What happens if you miss a payment
The underpayment penalty under IRC Section 6654 is not a flat fine. It works like interest, computed on Form 2210, installment by installment, at the federal short-term rate plus three percentage points, from each missed due date until the shortfall is paid. Paying your full 2026 tax with an on-time return in April 2027 still arrives with a penalty attached for the installments you skipped during 2026.
If your income is lumpy, a big launch in the fall, most of the year's revenue in one quarter, the annualized income installment method on Form 2210 Schedule AI can match your required payments to when the money actually arrived, which often shrinks or erases the penalty for early quarters when you had little income.
7. Frequently asked questions
What are the quarterly tax due dates for 2026?
April 15, 2026; June 15, 2026; September 15, 2026; and January 15, 2027. None of them fall on a weekend or holiday, so none shift.
Is the September 15, 2026 payment for the whole quarter?
It covers income earned June 1 through August 31, 2026. The payment periods are two, three, and four months long rather than even quarters, so match your payment to the period, not to a calendar quarter.
Can I just pay everything in April 2027 instead?
You can, but the penalty accrues from each missed 2026 installment date, so an on-time return does not erase it. The exception is small balances: if you owe less than $1,000 after withholding, no estimated payments were required at all.
How much should each payment be?
Either 25% of your safe harbor number (100% or 110% of your 2025 tax), or the tax on your actual year-to-date profit, including self-employment tax. The quarterly tax calculator computes it from your real income and filing status.
Do states use the same due dates?
Most income-tax states mirror the federal calendar, but the weightings can differ; California front-loads its schedule at 30%, 40%, 0%, and 30% rather than four equal payments. Check your state in the state tax deadlines index.
8. Know your number before the deadline
Nobody misses a quarterly payment because they cannot read a calendar. They miss it because the amount is a mystery, and guessing feels bad enough to postpone. The Amadae quarterly tax calculator turns your actual income into the exact federal payment for each 2026 date, safe harbor included. If you would rather never think about these dates again, book a free review and Amadae will compute, remind, and reconcile every payment for you as the year happens.