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Do I need to pay estimated tax?

The quarterly system has a knowable bar: a $1,000 test, and two safe harbours you can aim at instead of predicting the year perfectly. Answer seven questions and get the verdict — and the target — from the IRS rules themselves.

Income tax plus self-employment tax, before withholding and credits. The Self-Employment Tax Estimator or the Quarterly Estimated Tax Calculator can produce this figure from your income.
W-2 withholding (yours, or a spouse's on a joint return) plus refundable credits you expect. Withholding counts toward the same obligation as estimates.
Quarters already paid. These reduce what remains to be covered, dollar for dollar.
The total tax line of last year's return. The prior-year safe harbour only counts if that return covered all 12 months; leave this at 0 if there was no prior-year return, and the checker will use the 90% target alone.
5. Was last year's adjusted gross income over $150,000 — or over $75,000 if you are married filing separately?
6. Do all three of these hold: you had no tax liability last year, you were a U.S. citizen or resident alien for the whole of last year, and last year covered a 12-month period?
7. Is at least two-thirds of your gross income from farming or fishing, this year or last?

Your verdict

Answer the questions above

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How the target is builtAmount
90% of this year's expected tax—
Prior-year target (100% of last year's tax)—
Required annual payment (the smaller target)—
Already covered (withholding + credits + estimates sent)—
Still to pay to reach the target—
Per quarter, if the rest is split in four—
Balance still uncovered on this year's expected tax—

Open the Quarterly Estimated Tax Calculator

Estimate only — not a determination. This verdict applies the IRS estimated-tax rules stated below to the figures you entered, which are themselves estimates. Reaching a safe-harbour target generally avoids the underpayment penalty; it does not settle the tax itself, and any remaining balance is still due when you file. This is not tax advice.

Last updated: October 27, 2026

This checker decides whether estimated tax payments appear required on your figures — and, if they are, the safe-harbour target to aim at. It does not estimate your tax from your income: that is the job of the Quarterly Estimated Tax Calculator at the end, which also splits the amount into the four dated payments. Bring this checker the tax figures; it brings back the verdict.

How this verdict works

The rules below are the whole logic of the checker — the verdict implements them exactly as stated, and each rule names its primary source.

  • The $1,000 test. Individuals, including sole proprietors, partners, and S corporation shareholders, generally have to make estimated tax payments if they expect to owe tax of $1,000 or more when their return is filed. (IRS, Estimated taxes.)
  • The penalty is generally avoided in the same zone. Most taxpayers generally avoid the underpayment penalty if they owe less than $1,000 in tax after subtracting their withholding and refundable credits. (IRS Topic No. 306.) In this checker's arithmetic, the $1,000 test is applied to this year's expected tax minus withholding and refundable credits only — estimates already sent are not subtracted for this test. (Publication 505, Figure 2-A: “Don't subtract any estimated tax payments.”) Estimates already sent count instead toward what remains to pay: they reduce the still-to-pay figure, and the balance still uncovered shown below, dollar for dollar — but they do not change the $1,000-test result.
  • The two safe harbours, smaller wins. The penalty is also generally avoided if total payments — withholding and estimates combined — reach at least 90% of the tax for the current year, or 100% of the tax shown on the prior year's return, whichever is smaller. (IRS Topic No. 306; Publication 505, Required Annual Payment.) The prior-year return must cover all 12 months for the prior-year target to count.
  • The higher-income adjustment. If prior-year adjusted gross income was more than $150,000 — more than $75,000 if married filing separately — substitute 110% for 100% in the prior-year target. (Publication 505, same section.)
  • The no-liability exception. You do not have to pay estimated tax for the current year if all three hold: you had no tax liability for the prior year, you were a U.S. citizen or resident alien for the whole year, and your prior tax year covered a 12-month period. (IRS, Estimated taxes, “Who does not have to pay estimated tax.”)
  • Withholding counts, and counts evenly. Withholding from a W-2 job counts toward the same obligation as estimated payments, dollar for dollar, and for the penalty figure it is treated as paid evenly across the year — the treatment in the Form 2210 underpayment method — so withholding increased late in the year covers earlier quarters in a way a late estimated payment does not.
  • Farming and fishing are special. If at least two-thirds of gross income for either year is from farming or fishing, the required annual payment is the smaller of 66 2/3% of the current-year tax or 100% of the prior-year tax, on a single payment date. This checker flags that case as borderline and does not compute it. (Publication 505, same section.)

Rule sources: IRS, “Estimated taxes,” https://www.irs.gov/businesses/small-businesses-self-employed/estimated-taxes ; IRS Topic No. 306, “Penalty for underpayment of estimated tax,” https://www.irs.gov/taxtopics/tc306 ; IRS Publication 505 (2026), Tax Withholding and Estimated Tax, https://www.irs.gov/publications/p505 — checked October 27, 2026.

Reading the verdict

Payments appear needed means this year's expected tax minus withholding and refundable credits is $1,000 or more and your payments have not yet reached the smaller safe-harbour target; the number shown is the per-quarter amount that closes the remaining gap if the rest is split in four equal payments. Appears covered means your withholding, credits, and payments already reach the required annual payment — the penalty target is met even though a filing balance may remain. Generally no payments needed covers the two no-payment zones: the three-condition exception, and this year's expected tax minus withholding and refundable credits under $1,000 (estimates already sent do not count toward that test). Borderline is reserved for the farming-and-fishing case, where different rules take over.

Estimates for planning only. This checker is not tax advice. Figures entered are estimates; actual tax, credits, and filing status decide the real obligation. Verify against the IRS sources above or with a qualified tax professional.

Frequently asked questions

Who generally has to make estimated tax payments?

Individuals — including sole proprietors, partners, and S corporation shareholders — generally have to make estimated tax payments if they expect to owe tax of $1,000 or more when their return is filed. Corporations use a $500 figure instead. The IRS states the $1,000 test on its Estimated taxes page and in Topic No. 306.

What is the safe harbour, in one sentence?

Most taxpayers generally avoid the underpayment penalty if they owe less than $1,000 after subtracting withholding and refundable credits, or if they paid at least 90% of the current year tax or 100% of the prior year tax — 110% of the prior year tax if prior-year AGI was over $150,000, or over $75,000 if married filing separately — whichever target is smaller.

Does W-2 withholding really count the same as quarterly payments?

It counts toward the same total obligation, dollar for dollar — Topic No. 306 states the safe-harbour test on withholding and estimated tax combined. For the penalty figure, withholding is treated as paid evenly across the year, which is why increasing W-2 withholding late in the year can cover earlier quarters in a way a late estimated payment cannot.

I had no tax at all last year. Do I still need estimates this year?

Generally not, if all three IRS conditions hold together: you had no tax liability for the prior year, you were a U.S. citizen or resident alien for the whole year, and your prior tax year covered a 12-month period. Miss any one of the three and the general $1,000 and safe-harbour rules apply instead.

What if most of my income is from farming or fishing?

Different rules apply, and this checker flags that case as borderline instead of computing it: if at least two-thirds of gross income for either year is from farming or fishing, the required annual payment is the smaller of 66 2/3% of the current year tax or 100% of the prior year tax, with a single payment date. See Publication 505 for the full special rules.