Insight: 2026 Quarterly Estimated Tax Dates Small Businesses Should Not Miss
The 2026 calendar-year estimated-tax dates, the general payment rule, and planning steps to verify for your situation.
Last updated: October 9, 2026
Direct answer
For calendar-year individuals, the standard 2026 estimated-tax installments are generally due April 15, June 15, and September 15, 2026, and January 15, 2027. In most cases, you must make estimated-tax payments if you expect to owe at least $1,000 after subtracting withholding and refundable credits, and you expect withholding and refundable credits to be less than the smaller of 90% of your 2026 tax or 100% of your 2025 tax (110% for certain higher-income taxpayers). Exceptions and other rules apply; see 2026 Form 1040-ES.
The problem
Business owners who are used to paycheck withholding may overlook estimated payments. A filing-time balance or underpayment penalty can be a surprise when tax was not paid during the year. Start by checking the IRS general rule, estimating from current figures, and setting payment reminders.
Why quarterly exists
The federal income-tax system is pay-as-you-go. Tax may be paid through withholding or estimated payments; the right approach depends on income and circumstances. Review IRS Form 1040-ES to understand the rules that apply to your situation.
The set-aside system
- 1
Know the standard calendar-year dates.
For calendar-year individuals, the standard 2026 installment dates are April 15, June 15, September 15, 2026, and January 15, 2027. Check Form 1040-ES for tax-year, holiday, and other exceptions.
- 2
Estimate a reserve from your own tax picture.
There is no universal percentage of each payment. Estimate tax from expected profit, other income, withholding, credits, deductions, and state rules; keep a planned reserve separate and reassess as your numbers change.
- 3
Calculate and pay the required installment.
Use Form 1040-ES or qualified tax advice to calculate the installment. Paying less than required may still result in an underpayment penalty; keep payment records and revisit the estimate when income changes.
- 4
Reconcile payments with your return.
Compare withholding and estimated payments with your final tax calculation, keep the records, and check the IRS instructions for any balance, refund, or penalty. Uneven income may qualify for the annualized installment method.
Checklist
2026 federal individual estimated-tax dates
Summary
- •Standard calendar-year dates: April 15, June 15, September 15, 2026, and January 15, 2027; special rules can change the schedule.
- •The $1,000 test is only one part of the general estimated-tax rule; withholding, credits, and safe-harbor amounts also matter.
- •A flat reserve percentage is not a tax calculation; estimate from your full income, withholding, credits, and state situation.
- •An underpayment penalty may apply; its calculation depends on the amount and timing of payments.
Frequently asked questions
Official sources
- 2026 Form 1040-ES (IRS)
Current-year estimated-tax worksheets, safe-harbor tests, installment dates, and payment instructions.
- IRS: Underpayment of estimated tax by individuals
When an underpayment penalty may apply and how payment timing and amounts matter.
- Publication 505: Tax Withholding and Estimated Tax
Detailed safe-harbor, installment, withholding, and annualized-income rules.