Do I have to pay quarterly estimated taxes?

Generally yes if you expect to owe $1,000 or more after withholding, which covers most self-employed people and many with large investment income. If a W-2 job withholds enough to hit a safe harbor, no separate payments are needed. Under $1,000 of expected balance due, the requirement disappears entirely.

What is the safe harbor rule for estimated taxes?

Pay the smaller of 90 percent of this year's tax or 100 percent of last year's (110 percent if last year's AGI topped $150,000), spread across the four deadlines, and the IRS charges no underpayment penalty regardless of what you still owe in April. The prior-year option is popular because it is a known number all year.

When are quarterly taxes due in 2026?

April 15, June 15, and September 15, 2026, and January 15, 2027 for the fourth quarter. The quarters are uneven on purpose: the second covers only April and May. A date that falls on a weekend or holiday rolls to the next business day; all four of these land on weekdays.

What happens if I miss a quarterly payment?

The IRS assesses an underpayment penalty that works like interest, computed per quarter from the missed due date at the federal rate (Form 2210). Catching up the next quarter stops it accruing but does not erase what accrued. One fix late in the year: extra W-2 withholding counts as paid evenly, so it can retroactively cover early quarters.

Is the safe harbor the same as what I will owe?

No. It is the penalty-free minimum. If your income jumped, 100 or 110 percent of last year's tax can be far below the real bill, and the gap is due at filing, penalty-free but still due. Set aside your true tax rate from each payment (the self-employment tax calculator computes it) and treat the safe harbor as the payment schedule.

Quarterly Estimated Tax Calculator

Turn your expected 2026 tax into four safe-harbor payments: the 90% and 100/110% rules, your withholding credit, and the exact 1040-ES deadlines.

X f in

Payment per quarter

$2,500.00

Safe-harbor annual target: $10,000.00
To pay via estimates: $10,000.00
Which rule applies: 100% of last year's tax (the smaller target)

2026 estimated tax deadlines (Form 1040-ES)

Payment period	Due date	Amount
Q1 (income Jan 1 to Mar 31)	April 15, 2026	$2,500.00
Q2 (income Apr 1 to May 31)	June 15, 2026	$2,500.00
Q3 (income Jun 1 to Aug 31)	September 15, 2026	$2,500.00
Q4 (income Sep 1 to Dec 31)	January 15, 2027	$2,500.00

Quick answer: With the example inputs this page loads by default, the headline result (Payment per quarter) comes to $2,500.00. Turn your expected 2026 tax into four safe-harbor payments: the 90% and 100/110% rules, your withholding credit, and the exact 1040-ES deadlines. Change any input above and every figure updates instantly in your browser.

Figures shown are for the 2026 tax year. The calculator always applies the current year's figures.

Your inputs never leave your browser, and nothing is stored. See our privacy policy .

Fact-check: results on this page are verified against an independently coded reference oracle that covers all 106 calculators on this site. See how we verify .

The IRS expects tax through the year, and the safe harbor tells you how much: pay the smaller of 90 percent of this year's tax or 100 percent of last year's (110 percent if last year's income topped $150,000) and no underpayment penalty applies, even if you owe more in April. This calculator computes that target, credits your withholding, and splits the rest across the four 2026 deadlines.

What this result means

Most self-employed filers aim at the prior-year harbor because it is a known number in January, while the 90 percent rule needs a forecast; this tool picks whichever is smaller for you. Meeting the safe harbor does not mean you have paid the whole bill, only that the remainder waits penalty-free until filing, so keep the true set-aside from the self-employment tax calculator even when the required payments are lower. Payments run through IRS Direct Pay or EFTPS; missing a quarter accrues interest-style penalties from that quarter's date. Not tax advice.

Assumptions

The safe harbor follows IRC 6654 and Form 1040-ES for 2026: no underpayment penalty when your withholding plus timely estimated payments reach the smaller of 90 percent of this year's total tax or 100 percent of last year's total tax, raised to 110 percent when last year's adjusted gross income exceeded $150,000. The $75,000 threshold for married filing separately is not modeled.
No estimated payments are required when your expected balance due after withholding is under $1,000 (the de minimis rule). Farmers and fishermen have their own 66 2/3 percent rule, not modeled.
The required remainder is split into four equal payments against the 2026 deadlines (April 15, June 15, and September 15, 2026, and January 15, 2027). The annualized income installment method, which front-loads less for income earned late in the year, is not modeled.
Withholding is credited in full because the IRS treats it as paid evenly through the year regardless of when it is actually withheld, a timing feature that makes late-year W-4 adjustments an effective catch-up tool.
This computes the penalty-free minimum, not your full tax. If the safe harbor is below your actual tax, the difference is simply due at filing without penalty. State estimated taxes follow each state's own rules and are not modeled.
This is an estimate for educational purposes only, not tax advice. Confirm figures and dates with IRS Form 1040-ES.

Key terms

Definitions for the terms this calculator uses, in our finance glossary .

How it works

The US tax system is pay-as-you-go, and Form 1040-ES defines how much “as you go” means through two safe harbors (IRC 6654). Pay the smaller of:

90 percent of this year’s expected tax, or
100 percent of last year’s total tax, raised to 110 percent when last year’s adjusted gross income exceeded $150,000,

spread across the four deadlines, and no underpayment penalty applies no matter what you still owe at filing. Two carve-outs matter: if your expected balance due after withholding is under $1,000, no estimated payments are required at all, and withholding from a W-2 job counts as paid evenly through the year regardless of when it happens, which makes a late-year W-4 bump an effective catch-up tool.

The calculator picks your smaller harbor, subtracts expected withholding, and divides the remainder into four equal payments against the 2026 dates: April 15, June 15, September 15, and January 15, 2027.

Worked example

Expected 2026 tax of $12,000, last year’s total tax $10,000 on a $90,000 AGI, no withholding.

Current-year rule: 90% x $12,000 = $10,800.
Prior-year rule: 100% x $10,000 = $10,000 (AGI under $150,000, so no uplift).
The smaller target is $10,000, so each quarter is $2,500.

If last year’s AGI had been $200,000, the prior-year rule becomes 110% x $10,000 = $11,000, and the 90 percent rule ($10,800) takes over as the smaller target: $2,700 a quarter.

Scope and limitations

Equal quarterly payments only: the annualized income installment method (Form 2210, Schedule AI), which suits income earned unevenly, is not modeled, nor are the farmer/fisherman rule or the married-filing-separately $75,000 threshold. This computes the penalty-free minimum, not your full tax; any gap is due at filing. State estimated taxes are separate. This is an estimate for education, not tax advice.

Sources

Frequently asked questions

Do I have to pay quarterly estimated taxes?: Generally yes if you expect to owe $1,000 or more after withholding, which covers most self-employed people and many with large investment income. If a W-2 job withholds enough to hit a safe harbor, no separate payments are needed. Under $1,000 of expected balance due, the requirement disappears entirely.
What is the safe harbor rule for estimated taxes?: Pay the smaller of 90 percent of this year's tax or 100 percent of last year's (110 percent if last year's AGI topped $150,000), spread across the four deadlines, and the IRS charges no underpayment penalty regardless of what you still owe in April. The prior-year option is popular because it is a known number all year.
When are quarterly taxes due in 2026?: April 15, June 15, and September 15, 2026, and January 15, 2027 for the fourth quarter. The quarters are uneven on purpose: the second covers only April and May. A date that falls on a weekend or holiday rolls to the next business day; all four of these land on weekdays.
What happens if I miss a quarterly payment?: The IRS assesses an underpayment penalty that works like interest, computed per quarter from the missed due date at the federal rate (Form 2210). Catching up the next quarter stops it accruing but does not erase what accrued. One fix late in the year: extra W-2 withholding counts as paid evenly, so it can retroactively cover early quarters.
Is the safe harbor the same as what I will owe?: No. It is the penalty-free minimum. If your income jumped, 100 or 110 percent of last year's tax can be far below the real bill, and the gap is due at filing, penalty-free but still due. Set aside your true tax rate from each payment (the self-employment tax calculator computes it) and treat the safe harbor as the payment schedule.

Related calculators

Learn how this works

New to this topic? Our companion guide explains it in plain language: Quarterly Taxes for 1099 Workers: What to Pay and What to Set Aside

By Sam Sage Last reviewed July 2026.