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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11For 2026, most individuals can generally avoid the federal estimated-tax underpayment penalty by paying during the year at least the smaller of 90% of their 2026 tax or 100% of their 2025 tax. If your 2025 adjusted gross income was more than $150,000—or $75,000 if you file married filing separately—the prior-year figure is generally 110% instead of 100%. These are safe-harbor rules for avoiding a penalty, not a way to determine your final tax bill. Your income, deductions, credits, filing status, withholding and payment dates all affect the calculation.
First distinguish your tax bill from the penalty test
Your final 2026 federal tax is calculated from your tax-year income and applicable tax rules. The underpayment penalty is a separate charge that can apply when enough tax was not paid as income arrived during the year. Federal taxes generally operate on a pay-as-you-go basis: payment comes through withholding, estimated payments, or both.
There are two related but different $1,000 tests. The general estimated-tax payment test asks whether you expect to owe at least $1,000 after withholding and credits and whether your withholding and credits will be below the applicable required annual payment. Separately, the IRS says most taxpayers avoid the underpayment penalty if they owe less than $1,000 after subtracting withholding and refundable credits when they file. Do not treat one test as a substitute for the other.
Calculate the amount to pay for 2026
1. Estimate your 2026 tax
Use the IRS worksheet for the relevant tax year and your own expected facts to estimate total federal tax. Account for the income and taxes that apply to you, along with deductions and credits. A paycheck alone may not show the full-year picture if you also have other income or tax circumstances. The IRS Publication 505 for 2026 is the year-matched starting point for estimated-tax worksheets and rules.
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2. Find your 2025 tax and check the return period
For the prior-year safe harbor, use your 2025 tax amount and confirm that your 2025 return covered a 12-month tax year. Check your 2025 adjusted gross income as well: the higher-income multiplier generally applies if it was more than $150,000, or more than $75,000 for married filing separately.
3. Compare the applicable safe-harbor amounts
| Test | General 2026 figure | When it matters |
|---|---|---|
| Current-year test | 90% of estimated 2026 tax | Use the current-year percentage in the general safe-harbor comparison. |
| Prior-year test | 100% of 2025 tax | Generally applies when the higher-income test does not apply and the prior return covered 12 months. |
| Higher-income prior-year test | 110% of 2025 tax | Generally applies if 2025 AGI was more than $150,000, or $75,000 for married filing separately. |
| Qualifying farmer or fisher current-year test | 66⅔% of 2026 tax | May replace the 90% current-year percentage when the applicable farmer-or-fisher income test is met. |
For the general rule, the required annual payment is based on the smaller applicable current-year and prior-year safe-harbor figures. Farmers and fishers may have a different current-year percentage; use the relevant IRS worksheet and instructions to determine which tests apply to your circumstances. These percentages do not calculate your actual 2026 tax bill.
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4. Compare the annual amount with withholding and credits
Compare the required annual payment with the withholding and credits counted by the applicable IRS worksheet. If those payments will not meet the requirement, estimate the shortfall and plan timely installments. The payment method can be a mix of withholding and direct estimated payments; the calculation is about whether enough is paid on time, not which method you choose.
Plan payments around the installment dates
The general individual estimated-tax dates are April 15, June 15 and September 15 of the tax year, followed by January 15 of the next year. For 2026, these are the usual dates for payments toward 2026 tax, with the final installment ordinarily due January 15, 2027. A date can shift when it falls on a weekend or legal holiday, and disaster relief or another special rule can change a deadline. Check the IRS dates and notices that apply to the year and your location.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesThe IRS calculates an underpayment penalty separately for each required installment date. Paying enough later to cover the year’s total does not necessarily erase a shortfall for an earlier installment. Federal withholding is generally treated as paid evenly through the year. If actual withholding occurred on different dates, Form 2210 provides a way to use the actual timing when applicable.
Choose equal installments or annualize uneven income
Use the simpler installment approach when income is steady
If income is relatively even across the year, a regular installment plan is easier to forecast and document. Use the year-specific IRS worksheet to calculate the payment requirement and installments rather than assuming that the amount due at filing is the only relevant figure.
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Consider annualizing when income arrives unevenly
If a substantial share of your income arrives later in the year, equal installments may not reflect when you earned it. The annualized income installment method can align required payments more closely with income timing. The IRS provides this method through Schedule AI of Form 2210. It requires working through the schedule using income and deductions by period; keep records supporting the figures. Compare the effort and documentation with the benefit of matching payments to uneven income.
Check whether an exception or waiver applies
- Less than $1,000 due: Most taxpayers avoid the penalty if the amount owed after withholding and refundable credits is under $1,000.
- Safe harbor met: Meeting the applicable annual payment test generally avoids the penalty, subject to the year’s rules and your facts.
- Farmer or fisher: A qualifying taxpayer may use the 66⅔% current-year figure instead of 90% when the relevant income test is met.
- Possible waiver: The IRS may waive a penalty in certain unusual circumstances, including some casualty or disaster situations, or certain retirement-after-age-62 or disability cases when reasonable cause and no willful neglect apply. Eligibility is fact-dependent; consult the current Form 2210 instructions.
Use the form for the tax year you are calculating
For a 2026 estimate, use 2026 Publication 505 and the worksheets for that year. Form 2210 is used to determine whether an underpayment penalty applies and, when required, calculate it installment by installment; Schedule AI is the annualized-income route. The IRS’s 2025 Form 2210 instructions describe the most recently published return-year procedure available in the cited materials, but they are not a replacement for the correct instructions for the year being filed. Publication 17 for 2025 also advises considering 2026 tax-law changes when adjusting withholding and estimates.
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A personal dollar figure cannot be calculated from the safe-harbor percentages alone. You need your filing status, expected 2026 income and deductions, credits, withholding, 2025 tax and AGI, and the timing of payments. Use the IRS worksheets with those records, then verify deadlines and any relief that applies to you.
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