副業収入税計算機

開発者数学

入力

自動処理

出力

クライアント側

説明	金額
Net Self-Employment Income
Self-Employment Tax
Social Security (12.4%)
Medicare (2.9%)
Additional Medicare (0.9%)
SE Tax Deduction (50%)
Estimated Federal Income Tax
Total Estimated Tax
Effective Tax Rate
Quarterly Payment

Enter your side hustle income above to see your estimated tax breakdown.

Disclaimer: This tool provides estimates only and is not tax advice. Calculations are based on 2025 federal tax rates and do not include state taxes. Consult a qualified tax professional for your specific situation. The creators of this tool are not responsible for any errors or omissions in the calculations.

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副業収入税計算機

Estimate your federal taxes on side hustle and gig income with this free calculator. Whether you drive for a rideshare service, freelance on weekends, or sell products online, understanding your tax obligations is essential. This tool calculates self-employment tax (Social Security and Medicare), federal income tax using 2025 brackets, and tells you exactly how much to set aside each quarter.

使用方法

1. Select your filing status (single, married filing jointly, married filing separately, or head of household).

2. Enter your total gross side hustle income for the year.

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3. Enter any deductible business expenses (supplies, mileage, software, home office, etc.).

4. Optionally enter your W-2 or other income to get a more accurate tax bracket estimate.

5. Review the detailed breakdown showing self-employment tax, federal income tax, total estimated tax, and quarterly payment amounts.

機能

Self-Employment Tax Breakdown – See Social Security (12.4%), Medicare (2.9%), and Additional Medicare (0.9%) taxes separately.
2025 Federal Tax Brackets – Uses the latest progressive tax brackets for all four filing statuses.
Marginal Tax Calculation – Accurately calculates the additional income tax from your side hustle on top of your other income.
Quarterly Payment Guidance – Shows whether you need to make estimated quarterly payments and how much each one should be.
SE Tax Deduction – Automatically applies the 50% self-employment tax deduction to reduce your taxable income.
リアルタイムの結果 – Calculations update instantly as you type, no button clicks needed.

 よくある質問

What is self-employment tax and why do side hustlers pay it?

Self-employment tax covers Social Security and Medicare contributions. When you work a regular W-2 job, your employer pays half of these taxes. As a self-employed side hustler, you pay both halves — a combined 15.3% on 92.35% of your net earnings. The Social Security portion (12.4%) applies up to the wage base limit ($176,100 in 2025), while Medicare (2.9%) has no cap.
When are quarterly estimated tax payments due?

The IRS requires estimated tax payments four times a year: April 15, June 15, September 15, and January 15 of the following year. If your total tax liability from self-employment exceeds $1,000 for the year, you generally need to make these payments to avoid underpayment penalties.
Can I deduct business expenses from my side hustle income?

Yes. Ordinary and necessary business expenses directly related to your side hustle reduce your net self-employment income. Common deductions include vehicle mileage, home office costs, supplies, software subscriptions, professional development, and marketing expenses. Lower net income means lower self-employment tax and income tax.
How does the 50% self-employment tax deduction work?

The IRS allows you to deduct half of your self-employment tax from your adjusted gross income. This mimics the employer-side FICA deduction that W-2 employees receive. It does not reduce your self-employment tax itself, but it lowers your taxable income for federal income tax purposes, resulting in a smaller overall tax bill.