What Are Estimated Tax Payments and Who Must Pay?

Estimated tax payments are quarterly installments you send to the IRS to cover federal income tax on earnings that don’t have tax withheld at the source. If you expect to owe $1,000 or more after subtracting withholding and refundable credits, you’re generally required to make them.¹ The federal system runs on pay-as-you-go: waiting until April to settle up can trigger a penalty even if you eventually pay every dollar you owe.

Who Has to Pay

The requirement reaches anyone whose income doesn’t have enough tax withheld along the way. Self-employed workers, freelancers, and independent contractors are the core group, but the rule also covers people with significant investment income, rental income, alimony, or capital gains from selling stocks or property.¹ Retirees drawing pensions with little or no withholding and gig workers with fluctuating pay fall in the same bucket.

The $1,000 threshold is measured after you subtract withholding and refundable credits from expected total tax. Under that amount, you owe nothing quarterly.¹

If you’re self-employed, remember that your quarterly payment has to cover more than income tax. You also owe self-employment tax for Social Security and Medicare. For 2026, the combined rate is 15.3% on net earnings up to the Social Security wage base of $184,500, and 2.9% for Medicare on earnings above that.² An additional 0.9% Medicare tax applies to self-employment income over $200,000. Forgetting self-employment tax is one of the most common reasons new freelancers underpay.

How Much to Pay

Start with last year’s federal return. Prior-year income, deductions, and credits give you a reasonable baseline, especially if your situation hasn’t changed much. Form 1040-ES includes a worksheet that walks you through projecting current-year adjusted gross income, taxable income, and expected tax, then divides the result into four quarterly amounts.³

Safe Harbor Rules

You won’t owe an underpayment penalty if you meet any one of these thresholds:

Your total tax minus withholding and refundable credits comes out under $1,000.
Your withholding plus estimated payments equal at least 90% of the tax shown on your current-year return.
Your withholding plus estimated payments equal at least 100% of the tax shown on last year’s return.

The 90% and 100% tests are alternatives; you only need to satisfy whichever is smaller.¹ For higher earners the prior-year rule tightens: if your prior-year adjusted gross income exceeded $150,000 ($75,000 if married filing separately), you must pay 110% of last year’s tax rather than 100%.⁴ The 110% approach works well for people whose income swings year to year, because it gives you a fixed dollar target based on a number you already know.

Withholding Instead of Quarterly Payments

If you have a regular job alongside freelance or investment income, you can sometimes skip the quarterly process entirely by raising the withholding on your paycheck. Submit a new Form W-4 requesting additional withholding, and the extra amount taken from each check can cover the tax on your side income.⁵ The IRS Tax Withholding Estimator at irs.gov helps you figure out how much extra to request. This works best when your non-wage income is fairly predictable.

2026 Quarterly Deadlines

The IRS splits the year into four unequal periods, each with its own due date. For the 2026 tax year:

January 1 through March 31: payment due April 15, 2026
April 1 through May 31: payment due June 15, 2026
June 1 through August 31: payment due September 15, 2026
September 1 through December 31: payment due January 15, 2027

None of the 2026 dates fall on a weekend or federal holiday, so nothing shifts this year.⁶ When a due date does land on a Saturday, Sunday, or legal holiday, it moves to the next business day.⁷

You can skip the January 15 payment if you file your 2026 return and pay the full balance by February 1, 2027.⁶ That’s a tight window, but it’s useful if your fourth quarter came in lower than expected and you’d rather true everything up on the return.

How to Send Payments

The IRS accepts payments through several channels. Electronic options are fastest and give instant confirmation.

IRS Direct Pay is a free service that transfers funds straight from your checking or savings account, with an immediate confirmation number you can also receive by email.⁸
EFTPS (the Electronic Federal Tax Payment System) is also free and better suited to scheduling recurring payments. New users have to enroll and wait five to seven business days for a PIN by mail before making a first payment, so don’t sign up on deadline day.⁹
Credit or debit cards work through IRS-authorized processors. Personal credit cards run a fee of roughly 1.75% to 1.85% of the payment; personal debit cards carry a flat fee of about $2.10 to $2.15.¹⁰

If you prefer paper, mail a check or money order payable to “United States Treasury” along with the voucher from Form 1040-ES for that quarter. Write “2026 Form 1040-ES” and your Social Security number on the check.⁶ The postmark date controls whether you met the deadline, not the date the IRS processes the check.

Penalties for Underpaying

If you don’t pay enough through withholding and estimated payments combined, the IRS charges an addition to tax that works like interest on the shortfall. It’s applied to each missed or short installment for the period the money remained unpaid.¹¹¹² The rate adjusts each quarter based on the federal short-term rate plus three percentage points.

Because the penalty is figured separately for each quarter, missing one deadline costs less than missing all four. The IRS usually calculates the penalty for you and sends a notice, but you can compute it yourself on Form 2210 if you disagree with the IRS figure or want to use the annualized method to reduce it.¹³

The IRS can waive the penalty in limited situations. A casualty, disaster, or other unusual circumstance that made timely payment inequitable may qualify. So can retiring after age 62 or becoming disabled during the tax year or the year before, if the underpayment was due to reasonable cause rather than neglect.¹⁴ To request a waiver, check the applicable box in Part II of Form 2210 and attach a statement explaining your circumstances.

When Your Income Is Uneven

Dividing your annual tax into four equal chunks makes little sense if your income arrives unevenly. A landscaper who earns most of the year’s revenue between May and October shouldn’t have to pay the same amount in April as in September. The annualized income installment method recalculates your liability at the end of each quarter based on income actually received up to that point.¹⁵

The method annualizes your income through each period and sets that period’s installment accordingly. Slow quarters call for smaller payments; big quarters call for larger ones. The trade-off is more paperwork. You complete the Annualized Estimated Tax Worksheet in Publication 505, and when you file your return you attach Form 2210 with Schedule AI to show how each installment was figured.¹³ Once you use this method for any period, you must use it for all four.

If You Farm or Fish

Different rules apply if at least two-thirds of your gross income comes from farming or fishing: one payment deadline instead of four. For the 2026 tax year, that single payment is due January 15, 2027, and you can skip even that by filing your return and paying the full balance by March 2, 2027. The safe harbor is also more generous, at 66⅔% of current-year tax rather than the standard 90%.¹⁶

State Estimated Taxes Are Separate

Federal payments are only part of the picture. Most states with an income tax have their own estimated payment rules, usually on the same quarterly schedule but with different thresholds and penalty rates. Minimum liabilities that trigger state payments generally run from around $500 to $2,500, and state underpayment interest rates tend to fall between 7% and 11%. Check your state tax agency’s website for the specifics; state penalties are entirely separate from anything the IRS charges.

1
Internal Revenue Service. Estimated Taxes
2
Internal Revenue Service. Publication 926 (2026), Household Employer’s Tax Guide
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Internal Revenue Service. About Form 1040-ES, Estimated Tax for Individuals
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Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
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Internal Revenue Service. Taxpayers Should Check Their Federal Withholding to Decide if They Need to Give Their Employer a New W-4
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Internal Revenue Service. Form 1040-ES, Estimated Tax for Individuals
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Internal Revenue Service. Estimated Tax
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Internal Revenue Service. Direct Pay Help
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Electronic Federal Tax Payment System (EFTPS). Welcome to EFTPS Online
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Internal Revenue Service. Pay Your Taxes by Debit or Credit Card or Digital Wallet
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Office of the Law Revision Counsel. 26 U.S. Code 6654 – Failure by Individual to Pay Estimated Income Tax
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Internal Revenue Service. Quarterly Interest Rates
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Internal Revenue Service. Instructions for Form 2210
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Office of the Law Revision Counsel. 26 U.S. Code 6654 – Failure by Individual to Pay Estimated Income Tax
15
Internal Revenue Service. Publication 505 (2025), Tax Withholding and Estimated Tax
16
Internal Revenue Service. Farmers and Fishermen