Calculate your exact self-employment tax, federal income tax, and quarterly estimated payments. See every deduction available to you — including the SE tax deduction, QBI deduction, and retirement contributions.
💼 Self-employment income
🧾 Business deductions
📋 Your tax situation
📊 Complete tax breakdown
| Item | Amount |
|---|
📈 Your tax rate breakdown
📅 Estimated quarterly tax payments
Self-employed individuals must pay estimated taxes 4 times per year to avoid IRS penalties.
✅ Deductions applied
| Deduction | Amount |
|---|
Uses 2025 IRS tax brackets, standard deduction, and self-employment tax rates. SE tax = 15.3% on 92.35% of net SE income (Social Security wage base $176,100 for 2025; Medicare has no cap). QBI deduction = 20% of qualified business income for most sole proprietors. Results are estimates — consult a tax professional.
How to use the Self-Employment Tax Calculator
This calculator computes your complete self-employment tax bill — including SE tax, federal income tax, and state income tax — along with your quarterly estimated payment amounts and every deduction available to you as a self-employed worker.
- Enter your gross self-employment income. This is your total 1099 or freelance income before any business expenses are deducted. Include all sources: 1099-NEC, 1099-MISC, 1099-K, and any cash payments for services.
- Add your business deductions. Enter home office, vehicle/mileage, health insurance premiums, retirement contributions, software, and other business expenses. These reduce both your income tax and SE tax base.
- Enter other income if applicable. If you also have W-2 wages or investment income, enter it here. It affects your federal income tax bracket calculation.
- Fill in your tax details. Select your filing status and enter your state income tax rate. Enter any withholding already paid (from a W-2 job) and any estimated tax payments made during the year.
- Click Calculate. You’ll see your complete tax breakdown, a visual rate comparison, quarterly payment schedule with exact due dates, and personalized tips based on your situation.
How self-employment tax works
Self-employment tax is the mechanism by which independent contractors and freelancers pay into Social Security and Medicare. When you work as a W-2 employee, these taxes are split 50/50 between you and your employer — each paying 7.65%. As a self-employed worker, you pay both halves: the full 15.3%.
The SE tax calculation
Self-employment tax isn’t calculated on your gross income. Instead, it’s applied to 92.35% of your net self-employment income (gross income minus business deductions). This 92.35% factor exists because W-2 employees’ wages are effectively reduced by the employer’s half of FICA before hitting their taxable income — this adjustment approximates that same reduction for self-employed workers.
The SE tax rate of 15.3% breaks down as 12.4% for Social Security (on earnings up to the $176,100 wage base in 2025) and 2.9% for Medicare (on all earnings with no cap).
The SE tax deduction
You can deduct half of your self-employment tax from your gross income when calculating federal income tax. This above-the-line deduction (reported on Schedule 1 of Form 1040) partially offsets the burden of paying both halves of FICA and is applied automatically in this calculator.
The QBI deduction
Most self-employed workers also qualify for the Qualified Business Income (QBI) deduction, which allows you to deduct up to 20% of qualified business income from your federal taxable income. This deduction is in addition to the SE tax deduction and standard deduction, and can significantly lower your federal income tax bill.
Deductions available to self-employed workers
| Deduction | 2025 limit / rate | Reduces SE tax? |
|---|---|---|
| Business expenses (general) | Actual cost | Yes |
| Home office (simplified) | $5/sq ft, max $1,500 | Yes |
| Vehicle / mileage | 70¢ per business mile | Yes |
| SE tax deduction (50%) | Half of SE tax paid | No (income tax only) |
| Self-employed health insurance | 100% of premiums | No (income tax only) |
| SEP-IRA contribution | Up to 25% of net SE income | No (income tax only) |
| Solo 401(k) contribution | Up to $23,500 employee + 25% employer | No (income tax only) |
| QBI deduction | 20% of qualified business income | No (income tax only) |
Quarterly estimated tax deadlines (2025)
As a self-employed worker, you’re required to pay estimated taxes four times per year. Missing these deadlines can result in underpayment penalties, even if you pay the full balance when you file your return.
| Quarter | Income period | Due date |
|---|---|---|
| Q1 2025 | January 1 – March 31 | April 15, 2025 |
| Q2 2025 | April 1 – May 31 | June 16, 2025 |
| Q3 2025 | June 1 – August 31 | September 15, 2025 |
| Q4 2025 | September 1 – December 31 | January 15, 2026 |
Frequently asked questions
What is the self-employment tax rate in 2025?
The self-employment tax rate is 15.3% — broken down as 12.4% for Social Security and 2.9% for Medicare. However, SE tax is calculated on 92.35% of your net self-employment income (gross income minus business expenses), not the full amount. You can also deduct half of your SE tax when calculating your adjusted gross income, which reduces your federal income tax liability.
Do I have to pay self-employment tax if I only made a small amount?
You must pay self-employment tax if your net self-employment income was $400 or more during the year. This threshold is low — it means even part-time freelancers and gig workers with modest earnings owe SE tax. Below $400 of net SE income, you don’t owe SE tax, though you still need to report the income on your return.
How much should I set aside for taxes as a self-employed person?
A common rule of thumb is to set aside 25–30% of every payment received. This covers SE tax (approximately 14.1% of net income after the 92.35% adjustment) plus federal income tax (which varies by bracket and deductions) and state income tax. If you’re in a higher federal bracket or a high-tax state, setting aside 35% is safer. The exact percentage depends on your deductions and total income — use this calculator to determine your specific rate.
What tax forms do self-employed workers need to file?
Self-employed workers typically need to file: Schedule C (profit or loss from a business) to report income and business expenses; Schedule SE (self-employment tax) to calculate the SE tax owed; and Form 1040-ES to make quarterly estimated tax payments. If you have employees, additional payroll tax forms are required. The completed Schedule C and SE are attached to your Form 1040 annual return.
Is the home office deduction worth taking?
Yes, if you have a dedicated space used regularly and exclusively for business. The simplified method allows $5 per square foot up to 300 square feet ($1,500 maximum), with no receipts needed. The regular method requires calculating the percentage of your home used for business and applying it to actual home expenses (mortgage interest, rent, utilities, insurance), which can yield a larger deduction but requires more documentation. The home office deduction reduces your net SE income, lowering both your income tax and SE tax.
What is a Solo 401(k) and should I open one?
A Solo 401(k) — also called an Individual 401(k) or One-Participant 401(k) — is a retirement plan designed for self-employed individuals with no employees. In 2025, you can contribute up to $23,500 as the employee plus up to 25% of net self-employment income as the employer, for a combined maximum of $69,000 (or $76,500 if age 50+). Traditional Solo 401(k) contributions reduce your taxable income, potentially saving significant taxes. If your annual net SE income is over $50,000 and you’re not already maxing out a retirement account, a Solo 401(k) is one of the most tax-efficient tools available to you.
Tax planning strategies for the self-employed
- Open a separate tax savings account. Transfer 25–30% of every payment received immediately. Treat this as non-spendable money — it’s the government’s share, not yours.
- Max out retirement contributions. A SEP-IRA allows contributions up to 25% of net SE income (maximum $69,000). A Solo 401(k) allows even more in combined employee and employer contributions. These are among the most powerful tax reduction tools available.
- Deduct your health insurance premium. Self-employed health insurance is 100% deductible above-the-line for you, your spouse, and your dependents. This reduces both your AGI and your income tax.
- Track mileage from day one. At 70 cents per business mile in 2025, 10,000 documented business miles equals a $7,000 deduction. Use a mileage tracking app so you never miss a mile.
- Consider S-corp election at higher income levels. Above roughly $50,000–$80,000 in net SE income, electing S-corp status and paying yourself a reasonable salary can reduce your total SE tax liability. Consult a CPA to evaluate whether this makes sense for your situation.