Free Quarterly Tax Calculator (2026)

Detailed close-up image of a U.S. 1040 Individual Income Tax Return form, ideal for finance-related content.

Use our free quarterly tax calculator to estimate your federal estimated tax payments for 2026. If you are self-employed, a freelancer, or have income outside of a regular paycheck, the IRS requires you to pay taxes four times per year. Enter your income below to see exactly how much to set aside each quarter.

free quarterly tax calculator

Free Quarterly Tax Calculator (2026)

How This Free Quarterly Tax Calculator Works

The IRS requires you to pay taxes as you earn income throughout the year. If you are self-employed or have income that is not withheld by an employer, you must make estimated tax payments four times per year. This free quarterly tax calculator estimates exactly how much you owe each quarter based on your income, filing status, and deductions.

Step 1 — Enter Your Expected Annual Income

Enter your total expected gross income for 2026. If you are self-employed, also enter your business expenses. The calculator subtracts expenses to find your net self-employment income.

Step 2 — Self-Employment Tax

If you selected self-employed or 1099 income, the calculator applies the 15.3% self-employment tax on 92.35% of your net income. Half of that SE tax is then deducted from your income before federal income tax is calculated — exactly the way the IRS requires.

Step 3 — Federal Income Tax

Your net income minus the SE tax deduction and your standard deduction gives your federal taxable income. The 2026 tax brackets are applied progressively to calculate your federal income tax.

Step 4 — Subtract Withholding Already Paid

If you are a W2 employee with extra income, enter the amount already withheld from your paychecks. The calculator subtracts that from your total tax to find the remaining amount you need to pay through quarterly payments.

Step 5 — Quarterly Payment Amount

The remaining tax owed is divided by four to give you each quarterly payment amount. The calculator also shows the exact 2026 due dates for each payment.

Frequently Asked Questions

Who needs to pay quarterly estimated taxes?

You must pay quarterly estimated taxes if you expect to owe at least $1,000 in federal taxes for the year and your withholding will not cover at least 90% of your current year tax liability or 100% of last year’s tax liability. This applies to freelancers, independent contractors, self-employed individuals, and W2 employees with significant side income.

What are the quarterly tax due dates for 2026?

The four estimated tax payment deadlines for 2026 are April 15, June 16, September 15, and January 15, 2027. Missing a deadline can result in an IRS underpayment penalty even if you pay the full amount when you file your return.

What happens if I miss a quarterly tax payment?

The IRS charges an underpayment penalty calculated at the federal short-term interest rate plus 3%. The penalty is applied per quarter on the amount that was underpaid. Paying your quarterly taxes on time — even if the estimate is slightly off — avoids this penalty.

How do I pay my quarterly estimated taxes?

The easiest way is to pay online through the IRS Direct Pay system at IRS.gov or through the Electronic Federal Tax Payment System (EFTPS). You can also mail a check with IRS Form 1040-ES. EFTPS is recommended for self-employed individuals making regular quarterly payments.

Can I pay more than the estimated amount each quarter?

Yes. You can pay more than the minimum estimated amount each quarter. Overpayments are applied as a credit toward your next quarter’s payment or refunded when you file your annual tax return.

Does this calculator include state quarterly taxes?

No. This calculator estimates federal quarterly payments only. Most states that have income tax also require estimated quarterly payments. Check your state’s department of revenue website for state-specific quarterly payment requirements and deadlines.

What is the safe harbor rule for estimated taxes?

The IRS safe harbor rule protects you from underpayment penalties if you pay at least 90% of your current year tax liability or 100% of last year’s total tax liability (110% if your adjusted gross income was over $150,000). Paying based on last year’s tax bill is the simplest safe harbor strategy.

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Understanding Quarterly Estimated Taxes

For millions of self-employed workers, freelancers, and independent contractors, quarterly estimated taxes are one of the biggest financial responsibilities of the year. Unlike W2 employees who have taxes automatically withheld from every paycheck, self-employed individuals must calculate and pay their own taxes four times per year. This free quarterly tax calculator takes the guesswork out of that process.

Why the IRS Requires Quarterly Payments

The U.S. tax system operates on a pay-as-you-go basis. The IRS expects tax revenue throughout the year, not just at filing time in April. For W2 employees, employers handle this automatically through payroll withholding. For everyone else — freelancers, sole proprietors, rental income earners, investors with capital gains, and gig workers — quarterly estimated payments are the mechanism that keeps you in compliance with this requirement.

How to Calculate Your Quarterly Payment

The IRS provides two methods for calculating estimated payments. The first is the current year method — estimate your total tax for the year and divide by four. The second is the prior year safe harbor method — pay 100% of last year’s total tax liability (110% if your AGI exceeded $150,000) divided by four. Most self-employed individuals use the current year method because it more accurately reflects their actual income, especially if income varies month to month.

Self-Employment Tax and Quarterly Payments

Self-employed individuals must include both federal income tax and self-employment tax in their quarterly payments. SE tax is 15.3% on 92.35% of net self-employment income. Because this tax can be substantial — often larger than income tax for lower earners — factoring it into your quarterly estimates is critical. Our free quarterly tax calculator automatically includes SE tax when you select the self-employed income type.

Setting Money Aside Each Month

A practical strategy is to set aside 25-30% of every payment you receive into a separate savings account designated for taxes. When a quarterly deadline arrives, the money is already waiting. This prevents the common mistake of spending money that is owed to the IRS and scrambling to make a payment at the deadline.

Quarterly Taxes for W2 Employees with Side Income

If you have a regular W2 job and also earn freelance, rental, or investment income on the side, you may still owe quarterly estimated taxes. Your employer withholds tax based only on your W2 salary. If your side income creates an additional tax liability of $1,000 or more, the IRS expects quarterly payments on that amount. Enter your expected withholding from your W2 job and this calculator will show how much additional estimated tax you owe each quarter.

IRS Resources for Quarterly Estimated Taxes

For official IRS guidance on estimated taxes, visit the IRS Estimated Taxes page. To make a payment online, use IRS Direct Pay. This calculator is for estimation purposes only and does not constitute tax advice.

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