Estimated Tax Payments

The federal income tax is pay-as-you-go: you are expected to pay tax as you earn or receive income, not only when you file. For a paycheck, withholding does that automatically. Income that arrives without withholding, such as freelance or side hustle earnings, interest, dividends, rent, alimony under older agreements and capital gains, has to be covered by estimated payments instead.

Estimated tax covers more than income tax. It also pays self-employment tax, the alternative minimum tax and the 3.8% net investment income tax. To figure it, the Form 1040-ES worksheet has you estimate the year’s income, deductions and credits, subtract expected withholding, and spread what is left across the four payment periods.

In most cases you must pay estimated tax for 2026 if both of these apply: you expect to owe at least $1,000 after subtracting withholding and refundable credits, and you expect withholding and credits to cover less than a safe harbor amount, explained below. You are exempt for 2026 if you were a US citizen or resident all of 2025 and had no tax liability for that full 12-month year.

In practice the rule catches the self-employed, landlords, investors with large gains or dividends, and retirees whose pension, IRA and Social Security withholding is set low.

The underpayment penalty is measured against a required annual payment, the smaller of 90% of your 2026 tax or 100% of the tax shown on your 2025 return. If your 2025 adjusted gross income was over $150,000, or $75,000 if you file separately in 2026, the prior-year figure becomes 110%. If at least two-thirds of your gross income comes from farming or fishing, 66⅔% replaces 90%.

The prior-year safe harbor is the popular one because you know the number in advance, and it holds even if this year’s income jumps and you owe a large balance in April.

The test is applied to each installment, not just the year. Each due date generally needs a quarter of the required annual payment, and the penalty runs on each late quarter separately, so a large January payment cannot erase the penalty already run up on a shortfall in April, June or September. If your income is uneven, such as a big sale or Roth conversion late in the year, the annualized income installment method on Form 2210, Schedule AI, lets each payment follow the income received by then.

You can pay through your IRS Online Account, IRS Direct Pay, EFTPS, by card, or by check with a Form 1040-ES voucher. A due date that falls on a weekend or holiday moves to the next business day, and you may pay more often than four times if each period’s total arrives by its date.

Married couples can generally make joint estimated payments even if they live apart, though not once legally separated, and paying jointly does not lock in a joint return. In a community property state, a spouse paying separately figures the estimate on half of the community income plus their own separate income.

Retirees often need estimated payments for the first time, because nothing is withheld from a brokerage account and IRA or pension withholding may be set low. Many skip quarterly payments by raising withholding on a pension or IRA withdrawals, or by filing Form W-4V to have 7%, 10%, 12% or 22% withheld from Social Security.

Withholding also has a timing advantage estimated payments lack. Unless you show the actual dates, tax withheld during the year is treated as paid in equal parts on the four due dates. A December required minimum distribution with heavy withholding can therefore cover shortfalls from earlier quarters, which a January estimated payment cannot.

The IRS can also waive the penalty for someone who retired after reaching 62, or became disabled, in the tax year or the year before, if the underpayment was due to reasonable cause.

Most penalties come from timing rather than from the total owed. A quarter can be penalized even when the full year ends in a refund, so a strong fourth quarter does not rescue a thin first one. Life changes are the other trap: a new business, a first year of retirement or a large stock sale can move you from fully withheld to underpaid without any change in how you pay.