Quarterly Tax Calculator

Calculate quarterly estimated tax payments with federal + state taxes, safe harbor rules, and payment deadlines for all 50 US states. Free, fast, and private — runs entirely in your browser.

Disclaimer

This is a simplified estimate based on 2024 US Federal tax rules for self-employed individuals (1099). Does not account for all deductions, credits, or complex situations. Consult a CPA for your actual tax obligations.

Filing Status

Annual 1099 / SE Income ($)

Business Expenses ($)

Other Income (W-2, etc.) ($)

Tax Withholdings (W-2, etc.) ($)

State

Prior Year Total Tax ($)

For safe harbor calculation (line 24 on prior Form 1040)

1099 Income: $100,000 − Expenses: $15,000 = Net SE Income: $85,000

Estimated Quarterly Payment

$4,372.50

per quarter ($17,490/year after withholdings)

Total Annual Tax

$17,490

Effective Rate

20.6%

After-Tax Income

$67,510

Monthly Take-Home

$5,626

Quarterly Due Dates & Payments

Q1Jan 1 - Mar 31

$4,372.50

Due: April 15, 2025

Q2Apr 1 - May 31

$4,372.50

Due: June 16, 2025

Q3Jun 1 - Aug 31

$4,372.50

Due: September 15, 2025

Q4Sep 1 - Dec 31

$4,372.50

Due: January 15, 2026

Pay via IRS Direct Pay (irs.gov/directpay) or EFTPS.gov. Use Form 1040-ES vouchers if paying by mail.

Annual Tax Breakdown

Federal Income Tax$5,480

Adjusted Gross Income$78,995

Standard Deduction-$14,600

QBI Deduction (20%)-$17,000

Taxable Income$47,395

Self-Employment Tax (15.3%)

Total SE Tax$12,010

Social Security (12.4% on $78,498)$9,734

Medicare (2.9%)$2,276

SE Deduction (50% of SE Tax)-$6,005

Total Annual Tax$17,490

Income Distribution

79%

Take-HomeFederalSE Tax

Safe Harbor Rule (Avoid Underpayment Penalty)

You can avoid the underpayment penalty if you pay at least the lower of these two amounts throughout the year.

Option 1: 90% of Current Year Tax

$15,741

$3,935.25/quarter

Option 2: 100% of Prior Year Tax

N/A

Enter prior year tax above

Minimum Safe Harbor Quarterly Payment

$3,935.25

Using 100% of prior year threshold

After-Tax Take-Home Pay

Annual

$67,510

Monthly

$5,626

Weekly

$1,298

Important Notes for 1099 Freelancers

Self-Employment Tax: As a 1099 worker, you pay both the employer and employee portions of Social Security (12.4%) and Medicare (2.9%) taxes, totaling 15.3% on 92.35% of net earnings.

Safe Harbor Rule: To avoid underpayment penalties, pay either 90% of your current year tax or 100%/110% of your prior year tax (110% if your AGI exceeds $150K) throughout the year via quarterly estimated payments.

Common Deductions: Home office, equipment, software, health insurance premiums (self-employed), SEP-IRA or Solo 401(k) contributions, professional development, and business travel.

QBI Deduction: The Section 199A Qualified Business Income deduction allows eligible self-employed individuals to deduct up to 20% of their qualified business income.

Disclaimer: This is an estimate only. State tax rates shown are approximate. Does not account for all deductions, credits, AMT, or complex situations. Consult a qualified tax professional.

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How to Use Quarterly Tax Calculator

1Enter your expected annual income and deductions.
2Select your state and filing status.
3View quarterly payment amounts and due dates.
4Check safe harbor thresholds to avoid penalties.

Frequently Asked Questions

Who needs to pay quarterly estimated taxes?▾

Self-employed individuals, freelancers, and anyone who expects to owe $1,000+ in taxes and doesn't have sufficient withholding from wages.

What is the safe harbor rule?▾

You can avoid underpayment penalties by paying at least 100% of last year's tax liability (110% if AGI > $150K) or 90% of current year's tax.

Is this calculator free?▾

Yes, completely free with no sign-up required. All calculations run in your browser.

Does it include state taxes?▾

Yes, all 50 US states are included with current state income tax rates and brackets.

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About Quarterly Tax Calculator

Calculate quarterly estimated tax payments with federal + state taxes, safe harbor rules, and payment deadlines for all 50 US states. Free, fast, and private — runs entirely in your browser.

NexTool's Quarterly Tax Calculator is completely free to use with no sign-up required. Your data is processed directly in your browser and never sent to our servers, ensuring complete privacy and instant results.