Federal tax planning · Reviewed October 6, 2026

January 15, 2027 Estimated Tax Payment: Your 2026 Q4 Guide

Answer first: Most calendar-year taxpayers who make estimated payments must pay the fourth 2026 installment by January 15, 2027. It covers income received from September 1 through December 31, 2026. You can generally avoid that separate installment if you file your 2026 federal return by January 31, 2027 and pay the balance in full.

This deadline is easy to miss because it falls in the next calendar year. It is still a payment for tax year 2026, not an advance payment for 2027. The IRS Publication 505 and Form 1040-ES instructions control the details, including special rules for farmers, fishers, fiscal-year taxpayers and disaster areas.

What the January payment covers

Estimated tax is the pay-as-you-go system for income that does not have enough federal withholding. The final 2026 period runs from September 1 through December 31. Common examples include freelance or business profit, a year-end bonus without enough withholding, interest, dividends, rental income, retirement distributions, cryptocurrency sales and capital gains.

The four calendar-year periods are not equal three-month quarters:

If a deadline falls on a Saturday, Sunday or legal holiday, the IRS generally treats the next business day as timely. Check the current IRS calendar before submitting a payment.

Who should make the final estimated payment?

You generally look at two tests. First, you expect to owe at least $1,000 after subtracting federal withholding and refundable credits. Second, your withholding and timely estimated payments will be less than the smaller of 90% of your 2026 tax or 100% of your 2025 tax. The prior-year percentage can become 110% when 2025 adjusted gross income was above the IRS threshold ($150,000 for most filers or $75,000 for married filing separately).

That rule is a screening framework, not a request to pay one-fourth of last year's balance due. “Balance due” is what remained after withholding; “total tax” is the figure used for the prior-year safe harbor. Pull the total-tax line from your 2025 return and compare it with your 2026 projection.

W-2 employees may be able to increase payroll withholding instead of sending a separate payment. Pension and annuity recipients can also change withholding elections. Because withholding is generally treated as paid evenly throughout the year, it can sometimes reduce timing exposure, but do not change a W-4 or pension election without recalculating the remaining pay periods.

How to calculate the January amount

1. Gather your 2025 return, 2026 year-to-date income, withholding and prior estimated-payment confirmations.
2. Project full-year 2026 wages, business profit, interest, dividends, gains, retirement income and deductions.
3. Use the IRS Form 1040-ES worksheet or Publication 505 to estimate total tax and self-employment tax.
4. Choose the applicable safe-harbor target: current-year 90%, prior-year 100% or the higher-income 110% percentage.
5. Subtract federal withholding and timely installments already paid. The remaining amount is the annual target shortfall, not automatically the January installment.
6. Divide the remaining requirement among the installments still open, while accounting for uneven or seasonal income.

A household with $30,000 of projected 2026 tax and $20,000 of 2025 total tax may have a $20,000 prior-year target, or $22,000 if the 110% rule applies. If payroll withholding already covers $18,000 and earlier estimated payments cover $2,000, the safe-harbor shortfall may be zero even though the final return could still show tax due. The example is illustrative; your return, credits and filing status control.

Uneven income and the annualized method

Equal installments can be a poor fit when a large gain or business payment arrived late. Publication 505 describes an annualized income installment method that measures income, deductions and credits through each period. It can reduce an earlier installment when little income existed then, while increasing the payment for the period in which the income occurred.

Use this method only when your records support it. Keep brokerage statements, invoices, expense records and withholding details by date. Form 2210 and Schedule AI may be required when you use annualized income or claim an exception.

How to pay the IRS and keep proof

Use an IRS-listed method such as Direct Pay from a bank account, an IRS online account, EFTPS, an approved card processor or a mailed voucher with Form 1040-ES. Select 2026 as the tax year even though the payment date is in 2027. Save the confirmation number, amount, date, bank record and payment type.

Electronic payments reduce mailing uncertainty. Card processors may charge fees, while Direct Pay from a bank account is generally free. Do not wait until January 15 to discover that an EFTPS enrollment or bank verification is incomplete.

What if the payment is late or too small?

An underpayment penalty is based on the size and duration of a shortfall for each installment period. Paying the full annual tax by filing does not automatically erase an earlier timing shortfall. Form 2210 is used to calculate the penalty and evaluate exceptions, including annualized income and certain disaster relief.

If you discover a shortfall, pay promptly and update any remaining withholding or estimated payments. Keep a written calculation showing how you reached the amount. If a federally declared disaster affects your county, rely on the specific IRS notice rather than assuming every taxpayer receives the same postponement.

The early-filing exception

The IRS allows a practical alternative to a separate January payment: file your 2026 Form 1040 or 1040-SR by January 31, 2027 and pay the remaining balance in full. The exception does not mean the income was tax-free, and it does not remove any earlier installment obligation. It simply lets the final payment accompany the return when you file early.

Tax software may display a January voucher even when you qualify for the exception. Confirm that the return is accepted and the full balance is paid. If you file after January 31, plan for the January installment instead.

December checklist

• Reconcile 2026 income through November and update your year-end forecast.
• Check capital gains, retirement distributions and business profit that may arrive in December.
• Compare withholding and timely payments with the 90%, 100% or 110% target.
• Decide whether equal installments or annualized income better matches your records.
• Schedule the payment early and save proof.
• Review the separate state deadline and payment portal.

Use the income-tax calculator for a planning estimate, then verify the result against Form 1040-ES. If you are building a household cash plan, the budget calculator can reserve money for the January payment.

Official sources

• IRS Publication 505 (2026), Tax Withholding and Estimated Tax
• IRS estimated-tax FAQs
• IRS Publication 509, Tax Calendars
• IRS payment options

Frequently asked questions