Your estimated taxes, quarter by quarter

Form 1040-ES, Estimated Tax for Individuals, is the package you use to figure and pay tax on income that has no withholding, such as self-employment, interest, dividends, rent, gains and some retirement income. It includes an estimated tax worksheet to figure the amount and four payment vouchers, one for each quarter of the year. It keeps you current with the IRS instead of facing one large bill at filing.

Generally you must pay estimated tax if both are true: you expect to owe at least $1,000 for the year after withholding and refundable credits, and your withholding and credits will be less than the smaller of 90% of this year's tax or 100% of last year's tax, which becomes 110% if your prior-year AGI was over $150,000. It is not just for the self-employed; investors, landlords and retirees with untaxed income often owe it too.

For the 2026 tax year, the four payments are due April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027. All four fall on weekdays, so there is no weekend shift. If a due date ever lands on a weekend or holiday, it moves to the next business day. You can skip the final January payment if you file your 2026 return and pay everything owed by January 31, 2027.

Figure the smaller of your two safe harbor targets, 90% of this year's expected tax or 100% of last year's tax, subtract any withholding, and divide by four. Many people simply use 100% of last year's total tax, or 110% if their prior-year AGI was over $150,000, because that number is already known and locks in penalty protection without guessing at this year's income.

The safe harbor is the amount you must pay through withholding and timely estimated payments to avoid an underpayment penalty, no matter how much you ultimately owe. You meet it by paying the smaller of 90% of your current-year tax or 100% of your prior-year tax, or 110% of prior-year tax if that year's AGI was over $150,000, or $75,000 if married filing separately. It stops the penalty, but it does not erase the tax, which is still due at filing.

The IRS charges an underpayment penalty that works like interest on the amount you should have paid, figured separately for each quarter at the federal short-term rate plus three percentage points. Because it is calculated per period, an early shortfall costs more than a late one, since interest has longer to run. Meeting a safe harbor avoids the penalty even if you still owe a balance when you file.

Only if your withholding falls short of the safe harbor. If you have a W-2 job plus side income, you can often avoid quarterly payments entirely by increasing the withholding on your Form W-4, because withholding counts as paid evenly across the year. If your combined withholding still won't reach 90% of this year's tax or 100% to 110% of last year's, you make up the difference with 1040-ES payments.

Often yes. Withholding from a paycheck or pension is treated as paid evenly throughout the year, even if you increase it late in the year, so bumping up your W-4 or W-4P can cover income that has no withholding of its own. It is a common alternative to sending four separate 1040-ES payments, and it can even fix a shortfall discovered late in the year.

The standard method assumes your income arrives evenly and asks for four equal payments. If most of your income lands in one part of the year, such as a large fourth-quarter capital gain, you can use the annualized income installment method to match your payments to when the income was actually earned. You show this on Form 2210 with Schedule AI when you file, which can reduce or remove a penalty.

You can pay free from a bank account with IRS Direct Pay or the Electronic Federal Tax Payment System, by debit card, credit card or digital wallet through an approved processor for a fee, or by mailing a printed 1040-ES voucher with a check. You can also pay from your phone with the IRS2Go app. Paying electronically gives you a confirmation and reduces the risk of a late or misapplied payment.

Making one lump payment in April does not satisfy the earlier quarters, because the IRS figures the penalty period by period, so you can owe a penalty for the quarters you were short even if the annual total is right. The exception is meeting the prior-year safe harbor, where the quarterly threshold is treated as met. If you fall behind, pay as soon as you can to stop the penalty from growing.

Yes. Estimated payments are prepayments, not a return. You still file your Form 1040 after the year ends, and your total estimated payments are credited on the estimated tax payments line of the return. You then settle any remaining balance or claim a refund, and you can apply an overpayment forward to next year's estimates.

Yes. You can skip the final January payment for the year if you file your return and pay the entire balance due by January 31 of the following year. For the 2026 tax year, that means filing your 2026 return and paying in full by January 31, 2027 lets you skip the payment that would otherwise be due January 15, 2027.

Yes. If at least two-thirds of your gross income is from farming or fishing, you generally make just one estimated payment for the year, due January 15, and you can substitute 66 and two-thirds percent for the 90% current-year test. You can also skip that payment entirely if you file your return and pay all the tax owed by March 1. These rules recognize that farm and fishing income is seasonal.

No. The generator helps you figure your estimated tax and produce completed 1040-ES vouchers you can review and print. It does not send money to the IRS, so you still make each payment yourself through Direct Pay, EFTPS, a card, or by mail. It is not tax advice and does not replace tax software or a preparer, and you are responsible for the accuracy of your figures and for paying on time.