Quarterly Estimated Tax Calculator

About the Quarterly Estimated Tax Calculator

The Quarterly Estimated Tax Calculator determines how much you should pay each quarter in estimated taxes. If you have income not subject to withholding — self-employment, freelance, investment, or rental income — the IRS requires quarterly payments to avoid underpayment penalties.

This calculator estimates your total annual tax liability (income tax plus self-employment tax), subtracts any W-2 withholding, and divides the remainder into four equal quarterly payments. It also shows due dates and safe harbor thresholds.

Quarterly payments are generally due April 15, June 15, September 15, and January 15 of the following year. Missing these deadlines triggers an underpayment penalty that accrues interest from the due date, even if you eventually pay the full amount. The IRS allows two safe harbor methods: pay 100% of your prior year tax liability (110% for higher-income filers) or 90% of your current year liability. This calculator computes your quarterly amounts using both methods, factors in any W-2 withholding you already have, and shows the payment due on each date so you can plan ahead.

When This Page Helps

Missing or underpaying quarterly taxes results in penalties that accrue over time. This calculator helps you compare a full-year estimate against the safe harbor so you can avoid surprises. It is especially useful for freelancers, gig workers, landlords, and investors who do not have enough tax withheld automatically.

How to Use the Inputs

1. Enter your expected total annual income (all sources).
2. Enter your expected business/SE expenses (if self-employed).
3. Select your filing status.
4. Enter expected W-2 withholding (if any).
5. Enter last year's tax liability (for safe harbor calculation).
6. View your quarterly payment amount and due dates.

Example Calculation

Tips & Best Practices

• The safe harbor: pay 100% of last year's tax (110% if AGI > $150K) across 4 quarters to avoid all penalties.
• Alternatively, pay 90% of the current year's tax to satisfy the safe harbor.
• If your income is uneven, you can use the annualized installment method (Form 2210 Schedule AI) to reduce payments in low-income quarters.
• Set a calendar reminder for each due date — April 15, June 15, September 15, and January 15.
• Pay online via IRS Direct Pay or EFTPS for instant confirmation and no fees.
• Keep SE tax and income tax separate in your mind — both must be covered by quarterly payments.

Building a Quarterly Tax Budget

Many freelancers use the "30% rule" — setting aside 30% of every payment received for taxes. This covers both income tax and self-employment tax for most taxpayers in the 22–24% bracket. High earners should set aside 35–40%.

Safe Harbor Strategies

The safest approach is to base payments on 100% of last year's tax (110% if AGI > $150K), divided by four. This guarantees zero penalties regardless of current-year income changes. If you expect significantly lower income this year, use 90% of estimated current-year tax instead.

State Estimated Taxes

Most states with income tax also require quarterly estimated payments, often with the same due dates. Check your state's tax authority for specific rules. California, New York, and other high-tax states can add 5–13% to your total estimated payment obligation.

Frequently Asked Questions

• When are quarterly estimated taxes due?

  For tax year 2026, the standard federal due dates are April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027. If a due date falls on a weekend or legal holiday, the deadline moves to the next business day.

• Who needs to make quarterly payments?

  Anyone who expects to owe $1,000 or more in tax after subtracting withholding and credits. This commonly includes freelancers, self-employed individuals, landlords, and investors with significant capital gains or dividends.

• What is the safe harbor rule?

  You can avoid underpayment penalties by paying at least: (1) 90% of the current year's tax, or (2) 100% of last year's tax (110% if your prior-year AGI exceeded $150,000). Meeting either threshold satisfies the safe harbor.

• What happens if I miss a quarterly payment?

  The IRS charges an underpayment penalty on the shortfall for each quarter. The penalty is calculated at the federal short-term rate plus 3%, compounded daily from the due date until the payment date or April 15 of the following year.

• Can I pay more in one quarter and less in another?

  Yes. If your income is seasonal or irregular, you can use the annualized installment method to base each quarterly payment on actual income earned that quarter. This requires filing Form 2210 Schedule AI but can save you from overpaying early in the year.

• How do I make quarterly estimated tax payments?

  Pay online via IRS Direct Pay (irs.gov), EFTPS, or by mailing a check with a Form 1040-ES voucher. Electronic payments are fastest and provide instant confirmation. You can also pay through tax preparation software.