Quarterly Estimated Tax Calculator 2026
Last reviewed: August 17, 2026Methodology and rates verified against IRS Revenue Procedure 2025-32 and IRS Form 1040-ES.
Calculate your 2026 quarterly estimated tax payments. Combines self-employment tax and federal income tax, then applies the safe harbor rule — 90% of current year tax, or 100%/110% of prior year tax — to find the minimum you must pay each quarter to avoid the underpayment penalty.
Your information
Withholding from a salary job counts toward your quarterly obligation — enter the year-to-date amount from your most recent paystub.
How quarterly estimated taxes work
Based on IRC §6654 and IRS Form 1040-ES instructions for tax year 2026.
The pay-as-you-go system
The US tax system requires you to pay taxes throughout the year as you earn income, not in a single lump sum at filing. For employees, employers handle this automatically — they withhold federal income tax and FICA contributions from each paycheck and send those funds directly to the IRS. When you work for yourself as a freelancer, contractor, or sole proprietor, no employer withholds on your behalf. The IRS instead requires you to estimate your annual tax liability and pay it in four quarterly installments using Form 1040-ES.
Who is required to pay
You must make quarterly estimated payments if you expect to owe at least $1,000 in federal taxes for the year — after subtracting withholding and refundable credits — and your withholding alone will not cover the safe harbor threshold. Most self-employed individuals earning more than a few thousand dollars of net income will exceed the $1,000 threshold.
If you also have W-2 employment, tax withheld by your employer counts toward the requirement. In some situations — such as a spouse with substantial withholding from their own W-2 — withholding alone may be enough to satisfy the safe harbor, eliminating the need for separate quarterly payments.
The four due dates for 2026
Estimated payments are due four times per year. Note that the income periods covered are unequal:
If a due date falls on a weekend or federal holiday, the IRS extends the deadline to the next business day. Verify the specific date each year before submitting.
The safe harbor rule — two methods
The safe harbor rule defines the minimum total you must pay through the year to avoid the underpayment penalty. You only need to satisfy one of two methods:
Method 1 — 90% of current year tax. Pay at least 90% of the total federal tax (income tax + self-employment tax) you will owe for 2026. This requires estimating your current year income, which carries risk if your income fluctuates significantly.
Method 2 — Prior year tax method. Pay 100% of the total tax you owed on last year's Form 1040, line 24. If your prior year adjusted gross income exceeded $150,000 (or $75,000 if married filing separately), you must pay 110% of last year's tax instead. This method is often preferred because last year's tax is a known, fixed number — there is no estimation risk.
Example: Prior year tax $18,000; prior year AGI $120,000 (≤ $150,000). Safe harbor target = $18,000 × 100% = $18,000. Four equal payments of $4,500.
Example: Prior year tax $18,000; prior year AGI $200,000 (> $150,000). Safe harbor target = $18,000 × 110% = $19,800. Four equal payments of $4,950.
The underpayment penalty (IRC §6654)
If your cumulative payments fall short of the safe harbor target in any quarter, the IRS charges an underpayment penalty under IRC §6654. The penalty accrues at the applicable federal short-term interest rate plus 3 percentage points, calculated separately for each quarter based on the amount underpaid and how long the shortfall persisted. Critically, the penalty applies even if you pay the full balance by April 15 — the IRS measures compliance quarter by quarter, not annually.
This calculator shows what you need to pay to satisfy the safe harbor and avoid the penalty. It does not calculate the penalty itself. If you have already underpaid in a prior quarter, use IRS Form 2210 (Underpayment of Estimated Tax) to determine your exact penalty. Certain exceptions — such as first-year taxpayers or those who owe the underpayment due to a casualty or disaster — may allow the penalty to be waived.
How to make your payments
Three options are available:
- IRS Direct Pay (irs.gov/payments) — free, instant, no registration required. Pay from any US bank account. You receive a confirmation number immediately. Available up to 8pm ET on the due date.
- EFTPS (eftps.gov) — the Electronic Federal Tax Payment System requires a one-time enrollment, but lets you schedule payments in advance and view your full payment history. Preferred by taxpayers who pay regularly.
- Check or money order — made payable to "United States Treasury", mailed with the Form 1040-ES payment voucher for the relevant quarter. Allow sufficient mailing time before the due date.
Keep records of every payment, including the confirmation number and date. Your quarterly payments are credited against your total tax when you file Form 1040 — if you overpay, the excess is refunded or applied to next year.
Authoritative sources: IRS Form 1040-ES and instructions, IRS Topic 306 — Penalty for Underpayment of Estimated Tax, and IRS Revenue Procedure 2025-32 — 2026 inflation adjustments.
Need to see the full self-employment tax breakdown first? Our Self-Employment Tax Calculator shows the exact Social Security, Medicare, and Additional Medicare Tax amounts, plus the deductible half you can claim on Schedule 1.
Evaluating a W-2 vs 1099 offer? Our W-2 vs 1099 Calculator shows the 1099 gross rate you'd need to match a W-2 take-home, with a side-by-side tax comparison.
Frequently asked questions
Do I need to pay quarterly estimated taxes?
You must make quarterly estimated payments if you expect to owe at least $1,000 in federal taxes for the year after subtracting withholding and refundable credits. Most self-employed individuals with net earnings above a few thousand dollars will exceed this threshold. If you also have a W-2 job, tax withheld by your employer counts toward the requirement — high enough withholding can eliminate or reduce the need for separate quarterly payments.
What is the safe harbor rule for estimated taxes?
The safe harbor rule defines the minimum you must pay through the year to avoid the underpayment penalty. There are two methods — you only need to satisfy one. Method 1: pay at least 90% of your current year's total tax liability. Method 2: pay 100% of the total tax you owed on last year's Form 1040 (line 24). If your prior year adjusted gross income (AGI) exceeded $150,000, the second method requires 110% of last year's tax instead of 100%. The prior-year method is often preferred because you know the exact amount upfront, removing uncertainty.
What happens if I miss a quarterly payment or underpay?
If your payments fall short of the safe harbor target in any quarter, the IRS charges an underpayment penalty under IRC §6654. The penalty is based on the applicable federal short-term interest rate plus 3 percentage points, calculated per quarter on the underpaid amount. It applies even if you pay everything by April 15 — the IRS calculates the penalty separately for each quarter. If you believe your penalty should be waived or reduced, file IRS Form 2210 with your annual return. This calculator shows what you need to pay to avoid the penalty but does not calculate the penalty itself.
Can I pay a different amount each quarter instead of four equal payments?
Yes. The IRS allows you to calculate each quarter's payment based on your actual income earned so far that year — this is called the Annualized Income Installment Method, calculated on Schedule AI of Form 2210. It can reduce required payments in quarters where income is lower, which is useful for seasonal businesses. This calculator uses the simplified equal-installment method, which is sufficient for most taxpayers with relatively stable income throughout the year.
How do I actually make a quarterly estimated tax payment?
There are three main options. IRS Direct Pay (irs.gov/payments) is the simplest: free, immediate, and requires no registration — you pay directly from a bank account and receive instant confirmation. The Electronic Federal Tax Payment System (EFTPS, at eftps.gov) requires enrollment but lets you schedule payments in advance, which is useful for planning. You can also pay by check or money order made payable to "United States Treasury", mailed with the Form 1040-ES payment voucher for the relevant quarter. Keep records of all payments including confirmation numbers — these reduce your balance due at filing.
This calculator provides estimates only and does not constitute tax advice. It does not account for state or local taxes, the Annualized Income Installment Method, underpayment penalty calculations, or individual circumstances that may affect your liability. Consult a qualified tax professional for advice specific to your situation.