If your federal tax withholding or estimated payments are too low, first estimate your full-year tax and compare payments already made with the IRS safe-harbor rules. Increase remaining-year withholding with a new Form W-4, or make estimated payments with Form 1040-ES if your income is not subject to withholding. If the tax year has ended, assess any estimated-tax penalty separately from the balance shown on your return, using that year’s Form 2210 instructions.
The United States income-tax system is pay-as-you-go: the IRS says, “The United States income tax system is a pay-as-you-go tax system, which means that you must pay income tax as you earn or receive income during the year.” A balance due at filing does not by itself prove that a penalty applies, and paying a balance late does not automatically remove an estimated-tax penalty.
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Start by separating two different problems
Underpayment can create (1) a tax balance due when you file and (2) a penalty for not paying enough during the year. They are related but calculated differently. The balance is the remaining tax after credits and payments. The estimated-tax penalty is based on the amount that was underpaid, how long each installment remained underpaid, and the IRS underpayment interest rates in effect for the relevant period.
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If the tax year is still in progress
Correct the remaining payments as soon as you identify the shortfall. Employees generally change federal withholding by submitting a new Form W-4 to the employer. If income such as self-employment earnings, interest, dividends, rent, gains, prizes, or awards is not covered by withholding, calculate estimated payments with Form 1040-ES.
If the tax year has ended
Do not treat a current payment as if it automatically satisfied an earlier installment. Reconstruct what was paid and when, then use the applicable year’s Form 2210 instructions to determine whether you calculate a penalty or the IRS will calculate it and send a bill. The penalty analysis is based on installment dates and amounts, not only on the final amount due with the return.
Gather the information needed for a reliable estimate
Before changing a payment, assemble records for the entire year. IRS Publication 505 recommends having your prior-year return and a current-year income estimate available. You should also collect:
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- Current pay stubs or other records showing federal withholding to date and expected remaining withholding.
- Confirmation numbers, dates, and amounts for every estimated-tax payment.
- Expected wages, self-employment income, interest, dividends, rent, capital gains, prizes, awards, and other income for the full year.
- Expected deductions, tax credits, and refundable credits.
- Your filing status and the prior-year tax shown on the return.
- Information about special circumstances, such as farming or fishing income, a disaster, casualty, retirement, or disability.
Use the IRS Tax Withholding Estimator for a withholding review and the current-year IRS instructions or Publication 505 worksheets for the detailed calculation. An estimate based only on one paycheck can miss irregular income, bonuses, investment gains, or credits that change the annual result.
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Check whether you are inside a general safe harbor
For 2026, estimated tax is generally required when you expect to owe at least $1,000 after withholding and credits and expect withholding and credits to be below the applicable safe harbor. Most taxpayers generally avoid an estimated-tax penalty when they meet one of the tests below, subject to filing-status, income, and special-category rules.
| Test | General requirement | Important qualification |
|---|---|---|
| Small balance exception | Expected amount due after withholding and refundable credits is less than $1,000. | Use the amount after the relevant credits; other exceptions and special rules can still matter. |
| Current-year safe harbor | Payments equal at least 90% of the current-year tax. | The calculation uses the current year’s final tax, not simply tax withheld from wages. |
| Prior-year safe harbor | Payments equal at least 100% of the prior-year tax. | For 2026, the percentage generally becomes 110% when 2025 adjusted gross income exceeded $150,000, or $75,000 for married filing separately. |
The operative comparison is generally the smaller of 90% of current-year tax or 100% of prior-year tax. For a higher-income taxpayer covered by the 2026 rule, substitute 110% for the 100% prior-year figure. The prior-year percentage is not a universal shortcut: check the applicable year’s instructions, filing status, adjusted gross income, credits, and any special category.
Illustrative safe-harbor comparison
Suppose a taxpayer’s projected 2026 tax is $20,000 and the prior-year tax is $18,000. Ninety percent of the current-year figure is $18,000; 100% of the prior-year figure is also $18,000. If withholding and timely estimated payments are at least that amount, the general safe harbor may be met even if the final 2026 return shows more tax. This is only an illustration; the taxpayer must use the figures and rules that apply to the actual return.
Choose the right way to increase payments
| Income situation | Payment method | What to do |
|---|---|---|
| Wages or other income eligible for withholding | Withholding | Submit a revised Form W-4 to the payer or employer and ask when the change will take effect. |
| Self-employment, interest, dividends, rent, gains, prizes, awards, or other income without sufficient withholding | Estimated tax | Use Form 1040-ES to calculate installments and pay by the applicable due dates. |
| Both wages and nonwage income | Combination | Increase wage withholding and use estimated payments for the remaining shortfall; include both when testing the safe harbor. |
Changing wage withholding
Complete a new Form W-4 using your expected annual income, deductions, credits, and any additional amount you want withheld from each paycheck. Give the form to the employer rather than sending it to the IRS. Ask payroll when the revised amount will begin and verify a later pay stub. A withholding change made late in the year may have fewer pay periods to work, so the additional amount per check can be larger than if the adjustment had been made earlier.
Making estimated-tax payments
Use Form 1040-ES to estimate annual tax and divide the required amount into installments, then follow the payment instructions for the applicable year. Keep the confirmation for every payment. A payment made after an installment date generally does not retroactively become an on-time payment for that earlier installment; timing affects the penalty computation.
Know the estimated-tax installment calendar
For a typical calendar-year individual, estimated payments are generally due April 15, June 15, September 15, and January 15 of the following year. The dates can shift because of weekends, holidays, or IRS disaster relief, so confirm the dates in the current-year Form 1040-ES instructions.
- Estimate the full-year tax and required annual payment.
- Subtract withholding and estimated payments already credited to the year.
- Allocate the remaining amount among the installments that have not yet come due.
- Record the date and confirmation of each payment.
Equal quarterly installments are not always appropriate. If income arrives unevenly—for example, a large gain late in the year—the annualized-income method in Form 2210 may match required payments to the periods when income was actually earned. That method can reduce or eliminate a penalty that an equal-installment calculation would otherwise produce, but it requires the annualized worksheet and accurate period-by-period income records.
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Review Form 2210 rules
Read the Form 2210 instructions for the tax year at issue. They distinguish taxpayers who must calculate and attach Form 2210 from those for whom the IRS calculates the penalty. The IRS may calculate the amount and send a notice for many taxpayers. If your situation requires a self-calculation—such as an annualized-income claim or a requested waiver—complete the required parts and attach the form to the return.
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Match payments to installments
List each withholding amount and estimated payment by date. Withholding is generally treated differently from separate estimated payments in the IRS computation, so use the form instructions rather than an informal spreadsheet rule. Check that payments were applied to the intended tax year and that no confirmation or transfer date is missing.
Read an IRS notice carefully
A notice will identify the tax year, the amount assessed, and payment instructions. Compare the notice with your records and the applicable Form 2210 calculation. If the notice is wrong, respond by the deadline shown and include documentation. If the amount is correct but unaffordable, address payment of the balance promptly while separately determining whether a penalty waiver or correction is available.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Ask whether a penalty waiver fits your facts
Waivers are limited and fact-specific. The Form 2210 instructions describe potential relief for certain casualty, disaster, or unusual-circumstance situations. Special relief may also apply when a taxpayer retired after reaching age 62 or became disabled, subject to the IRS conditions and required documentation. A general cash-flow problem, a missed date, or not knowing the rules does not automatically qualify.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteDocument the event, dates, and effect on your ability to make the required payments. Follow the waiver section of the applicable Form 2210 instructions rather than assuming that a request will be granted. Disaster postponements can change due dates for affected taxpayers and locations, so verify the IRS notice covering the particular event.
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If you cannot pay the balance in full
Pay what you can as soon as possible. The IRS advises prompt payment because it can stop additional penalty and interest from accumulating on the outstanding balance. If the remaining amount is unaffordable, review IRS payment-plan options and follow the application instructions for your circumstances.
A payment plan addresses collection of the balance shown on the return or notice. It does not automatically erase a separate estimated-tax penalty for inadequate or late installments. Continue to review the penalty calculation even after arranging payments.
Common mistakes that make an underpayment worse
- Confusing a filing balance with the penalty test: A large balance can still be penalty-free if a safe harbor was met, while a refund does not guarantee that no penalty applies.
- Using the wrong prior-year percentage: For 2026, a 2025 AGI above $150,000, or $75,000 for married filing separately, generally changes the prior-year comparison from 100% to 110%.
- Ignoring income without withholding: Interest, dividends, rent, gains, prizes, awards, and self-employment income can create a shortfall even when every paycheck looks correct.
- Paying late and assuming the earlier installment is fixed: The IRS considers when each amount was due and paid.
- Using equal installments despite uneven income: Check the annualized-income method when income is concentrated in particular periods.
- Relying on an old form or date: Use the Form 1040-ES, Form 2210, Publication 505, and payment calendar for the tax year involved.
- Expecting a payment plan to remove the penalty: Collection arrangements and estimated-tax penalty relief are separate issues.
A practical checklist
- Identify the tax year and filing status.
- Gather the prior return, current income estimate, withholding records, estimated-payment confirmations, and credit information.
- Use the IRS Tax Withholding Estimator or Publication 505 worksheets to estimate full-year tax.
- Compare expected payments with the $1,000 exception and the applicable 90%, 100%, or 110% safe-harbor test.
- Submit a new Form W-4 if wages can cover the shortfall.
- Use Form 1040-ES for income not covered by withholding and observe each installment date.
- If the year ended, apply Form 2210 to the actual payment dates and check whether the IRS will calculate the penalty.
- Consider the annualized-income method or a waiver only when the facts and instructions support it.
- Pay any balance you can promptly and review IRS payment-plan choices for the rest.
- Keep confirmations, worksheets, forms, and notices with the tax-year records.
When professional help is worthwhile
Consider qualified tax assistance when income is irregular or comes from several sources, when you need an annualized-income calculation, when a disaster or disability waiver may apply, or when an IRS penalty notice does not match your records. Have the professional review the actual income, filing status, withholding, credits, prior-year tax, payment dates, and applicable-year forms. State income-tax obligations are separate from the federal rules described here.
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Federal thresholds, payment dates, interest rates, disaster relief, and forms can change. Before submitting a payment or waiver request, confirm the latest IRS instructions for the exact tax year involved.
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