What Are Estimated Tax Payments?

Estimated tax payments are payments a taxpayer sends during the year toward expected income tax and certain other taxes that are not fully covered by withholding. They are commonly used by self-employed people, business owners, investors, landlords, retirees, and employees with significant income outside their paychecks.

Who may need to make estimated tax payments?

Federal taxes generally must be paid as income is earned or received. Estimated payments may be needed for self-employment or pass-through income, interest, dividends, capital gains, rent, royalties, retirement income, prizes, unemployment compensation, or wages with insufficient withholding.

For 2026, an individual generally must consider federal estimated payments when both of these apply:

1. The taxpayer expects to owe at least $1,000 after subtracting withholding and refundable credits.
2. Expected withholding and refundable credits are less than the smaller of 90% of 2026 tax or 100% of 2025 tax. The prior-year percentage becomes 110% for certain higher-income taxpayers, and special rules apply in other situations.

Form 1040-ES contains the detailed worksheet. A taxpayer who had no prior-year tax liability may qualify for an exception when the citizenship or residency and full-year requirements are met.

2026 federal estimated-tax due dates

These periods are not four equal three-month quarters. If a due date falls on a weekend or legal holiday, the applicable instructions may move it to the next business day. Fiscal-year taxpayers and qualifying farmers and fishers follow different rules.

How estimated tax is calculated

The Form 1040-ES worksheet projects AGI, taxable income, deductions, credits, income tax, self-employment and other taxes, withholding, and refundable credits.

The taxpayer then determines the required annual payment and subtracts expected withholding. Under the regular federal installment method, the remaining required amount is generally divided among four due dates. If income is uneven, the annualized income installment method may better match payments to when income was earned.

Estimates should be revised when facts change. A large capital gain, business slowdown, new job, bonus, retirement distribution, or unexpected credit can materially change the projection.

Estimated-tax example

Assume a taxpayer projects $18,000 of 2026 federal tax and $2,000 of federal withholding. The 2025 return showed $14,000 of tax, covered a full 12 months, and prior-year AGI did not exceed the higher-income threshold. Ignore refundable credits and special rules.

Under the regular federal method, $12,000 would generally be paid as four $3,000 installments. If the projection is correct, the taxpayer may still owe $4,000 with the return: $18,000 of tax minus $2,000 of withholding and $12,000 of estimates.

Estimated payments vs. withholding

Both are prepayments, but timing differs:

• Estimated payments are generally credited on the date paid.
• Federal withholding is generally allocated one-fourth to each payment due date unless the taxpayer establishes actual withholding dates.
• Withholding is arranged through an employer or payer; estimates are paid directly by the taxpayer.

An employee with side-business or investment income may increase Form W-4 withholding, make estimated payments, or use a combination. The best method depends on cash flow, available wages or distributions, payer capability, and federal and state rules.

How to pay and what to keep

Federal payment options include IRS Online Account, Direct Pay, EFTPS, electronic withdrawal, card, or a Form 1040-ES voucher.

Keep payment confirmations and dates, bank records, vouchers, prior-year returns, current income and expense projections, withholding records, and notes showing how each payment was calculated. Include prior-year refunds applied forward. Couples filing separately may need to allocate payments.

Where estimated payments appear on the return

Federal estimated payments and a prior-year overpayment applied forward are generally reported in the payments section of Form 1040. For 2025, they enter line 26. Tax software or IRS account records should be reconciled with the taxpayer's confirmations.

Do not combine estimated payments with income-tax withholding merely because both reduce the final balance. Keeping them separate makes missing or misapplied payments easier to identify.

California connection

California uses Form 540-ES and has a lower expected-balance threshold. For 2026, an individual generally must consider California estimates when expecting to owe at least $500 after withholding and credits (or $250 when married/RDP filing separately), and the state's percentage tests are not met.

California lists the same four calendar-year due dates for 2026, but the required annual payment is allocated differently:

California should not be described as four equal quarterly payments. Taxpayers with 2025 California AGI over $150,000 (or $75,000 when married/RDP filing separately) generally use a 110% prior-year amount in the comparison. Taxpayers with 2026 California AGI at least $1 million (or $500,000 when married/RDP filing separately) must base estimated tax on current-year tax.

Use FTB Web Pay or another approved method for California and keep separate California confirmations.

Common estimated-tax mistakes

• Treating estimated tax as an extra tax or deduction
• Paying only when the annual return is filed
• Assuming four "quarters" are equal three-month periods
• Using four equal installments for California
• Ignoring self-employment or other taxes in the projection
• Applying the 100% prior-year test when 110% is required
• Making enough total payments but making an early installment late
• Failing to revise estimates after a major gain or income change
• Mixing federal and California payments or confirmation numbers
• Relying on a bank withdrawal without confirming the tax agency credited it

When estimated-tax planning may help

Planning is useful when income varies, a business is new, a large gain occurs, retirement begins, or withholding cannot be adjusted enough. Current books can replace guesses with actual profit and deductions.

For seasonal income or a late-year transaction, annualization may reduce an installment requirement. It adds complexity and generally requires Form 2210 or California Form 5805 support, so contemporaneous records matter.

Frequently asked questions

Related terms

• Tax Withholding
• Estimated Tax Safe Harbor
• Underpayment Penalty
• Tax Liability
• Adjusted Gross Income (AGI)

Official sources

• IRS — Estimated taxes
• IRS — 2026 Form 1040-ES
• IRS — Publication 505, Tax Withholding and Estimated Tax
• IRS — Payments
• California FTB — 2026 Form 540-ES instructions
• California FTB — Estimated tax payments
• California Tax Service Center — Estimated income tax payments

The definitions and examples on this page are for informational purposes only and do not constitute tax advice. Tax laws change frequently and individual circumstances vary. Consult a qualified tax professional before making decisions based on this content.