In this guide
The fourth estimated federal tax payment for tax year 2026 is ordinarily due January 15, 2027. It belongs to your 2026 taxes, even though you pay it in 2027.
Freelancers, business owners, investors and employees with insufficient withholding should review their situation before this deadline. Paying the full balance when filing your return does not necessarily eliminate penalties for previous underpayments.
Who Needs to Pay Estimated Tax?
Estimated tax covers income tax and other applicable taxes, including self-employment tax, when withholding is insufficient.
You generally need estimated payments for 2026 if both conditions apply:
- You expect to owe at least $1,000 after subtracting withholding and refundable credits.
- Your withholding and refundable credits will be less than the smaller of 90% of your 2026 tax or 100% of your 2025 tax, subject to special rules.
The prior-year comparison requires a 2025 return covering 12 months.
People commonly affected include:
- Freelancers and independent contractors;
- Sole proprietors, partners and S corporation shareholders;
- Investors receiving dividends or capital gains;
- Landlords and retirees with insufficient withholding;
- Employees with significant income outside their jobs.
Alternatively, an employee may increase payroll withholding through Form W-4.
Estimated Tax Due Dates for 2026
For most calendar-year individuals:
| Payment period | Ordinary payment deadline |
|---|---|
| January 1–March 31, 2026 | April 15, 2026 |
| April 1–May 31, 2026 | June 15, 2026 |
| June 1–August 31, 2026 | September 15, 2026 |
| September 1–December 31, 2026 | January 15, 2027 |
These periods are not four equal calendar quarters. Disaster relief and special taxpayer rules may change the applicable schedule.
January 15 is an estimated-payment deadline, not the ordinary annual income-tax return filing deadline. State estimated-tax requirements should be checked separately.
How the Safe-Harbour Rules Work
A safe harbour helps determine how much must be paid during the year to avoid an estimated-tax underpayment penalty. It does not reduce your final tax liability.
The ordinary annual target is the smaller of:
- 90% of your 2026 tax; or
- 100% of your 2025 tax.
If your 2025 adjusted gross income exceeded $150,000, replace 100% with 110%. The threshold is $75,000 if your 2026 filing status is married filing separately. Special rules apply to qualifying farmers and fishermen.
For example, assume your 2025 tax was $12,000, your income was below the higher-income threshold and your estimated 2026 tax is $20,000. The ordinary annual safe-harbour target is $12,000, rather than $18,000. Withholding reduces the estimated payments needed.
However, you must meet the applicable installment requirements. Paying the annual target in full in January may leave penalties for previous periods.
How to Calculate and Pay Using Form 1040-ES
1. Update your 2026 estimate
Complete the 2026 Form 1040-ES worksheet, considering your income, deductions, credits and applicable tax-law changes.
If you are self-employed, estimate business profit after allowable expenses rather than treating all business receipts as profit.
2. Reconcile payments already made
Check:
- Federal withholding;
- Estimated payments and their dates;
- Any 2025 overpayment applied to 2026;
- Changes in income since your last calculation.
Keep payment confirmations and compare them with IRS account records.
3. Select the correct payment details
Use IRS Direct Pay, your IRS Online Account or another currently available IRS payment method.
Even if you pay in January 2027, select estimated tax and tax year 2026. Form 1040-ES includes worksheets and payment vouchers; electronic payment generally does not require mailing a voucher.
Save the confirmation and verify that the payment was completed.
What If Your Income Is Uneven?
A large year-end capital gain or a business that started late in the year may require a different calculation from four equal installments.
The annualized income installment method can align required payments with when income arose. Form 2210 and Schedule AI may be needed to calculate and explain that treatment.
Do not simply divide the remaining bill by four without reviewing the previous payment periods.
Penalties and Important Exceptions
The underpayment penalty depends on the amount underpaid, how long it remained unpaid and the applicable quarterly rates. It is not a single flat percentage for every taxpayer.
Important exceptions include:
- No prior-year liability: You generally do not need 2026 estimated payments if you had no 2025 tax liability, were a U.S. citizen or resident alien throughout 2025 and your 2025 tax year covered 12 months.
- Early filing: You can omit the January 15 installment if you file your 2026 return by February 1, 2027 and pay the entire balance due with it. This does not erase previous installment underpayments.
- Special circumstances: Farmers, fishermen and qualifying disaster-affected taxpayers may have different rules.
A return-filing extension does not postpone estimated-payment deadlines or automatically extend the time to pay. Nonresident aliens should review Form 1040-ES (NR) rather than assume the standard schedule applies.
For calculation and filing assistance, contact TaxClear’s U.S. tax filing team.
Frequently Asked Questions
Does the January 2027 payment belong to tax year 2027?
No. The January 15, 2027 installment discussed here belongs to tax year 2026.
Can salaried employees owe estimated tax?
Yes, particularly when withholding is insufficient to cover investment, rental or side-business income.
Does paying in January fix every previous shortfall?
No. Each installment period is tested separately.
Can I owe a penalty even if I receive a refund?
Yes. Previous payments may have been insufficient or late, although a refund does not automatically mean a penalty applies.
Does first-time penalty relief cover estimated tax?
No. Estimated-tax penalties have separate waiver rules. Review Form 2210 and any applicable disaster or statutory relief.
