Self-Employment Tax Calculator

The IRS allows you to reduce your net self-employment earnings by 7.65% before calculating SE tax. This is done by multiplying your net SE income by 92.35% (0.9235) to arrive at your "SE tax base." The reduced amount is what you actually pay the 15.3% rate on.

Why does this adjustment exist? It's designed to put self-employed individuals on equal footing with W-2 employees. When you work for an employer, the employer pays half of FICA (7.65%) on your behalf, and that employer portion is not included in your taxable wages. The 92.35% multiplier approximates this same benefit for the self-employed by effectively excluding the "employer half" of FICA from the tax base.

Example: If your net SE income is $100,000:

• SE tax base = $100,000 × 0.9235 = $92,350
• Social Security = $92,350 × 12.4% = $11,451
• Medicare = $92,350 × 2.9% = $2,678
• Total SE tax = $14,130 (not $15,300 as you'd get on the full $100,000)

This 92.35% adjustment saves approximately $1,170 on $100,000 of SE income. It's a small but meaningful reduction, and it's applied automatically by this calculator.

Unlike W-2 employees who have taxes withheld from each paycheck, self-employed individuals must pay their own taxes throughout the year using quarterly estimated payments. The IRS expects you to pay taxes as you earn income, not in one lump sum at tax time.

The four quarterly due dates are:

• Q1: April 15 — Covers income earned January through March
• Q2: June 15 — Covers income earned April through May (note: only a 2-month window)
• Q3: September 15 — Covers income earned June through August
• Q4: January 15 (following year) — Covers income earned September through December

How much should you pay? The IRS requires you to pay whichever is smaller: 90% of your current year's tax liability, or 100% of your prior year's tax liability (110% if your AGI exceeded $150,000). The simplest approach for most freelancers is to estimate their annual income, calculate the total tax, and divide by four.

What happens if you don't pay? The IRS charges an underpayment penalty — essentially an interest charge on the amount you should have paid each quarter. The penalty rate fluctuates with federal interest rates. Even if you can pay your full tax bill on April 15, you may still owe penalties for not making quarterly payments throughout the year.

Use Form 1040-ES to calculate and submit your quarterly estimated payments. You can pay online through IRS Direct Pay, EFTPS, or by mailing a check with the 1040-ES voucher.

The total FICA tax rate is the same whether you're self-employed or a W-2 employee: 15.3% (12.4% Social Security + 2.9% Medicare). The critical difference is who pays each portion.

W-2 employees:

• Employee pays 7.65% (6.2% SS + 1.45% Medicare) — deducted from each paycheck
• Employer pays the other 7.65% — this is an additional cost to the employer on top of your salary
• You never see the employer half on your pay stub or tax return

Self-employed individuals:

• You pay the full 15.3% because you're both the employer and the employee
• The tax is calculated on 92.35% of net SE income (the employer half adjustment)
• You can deduct the "employer half" (50% of SE tax) from your gross income, reducing your income tax

The real-world impact: On $100,000 of income, a W-2 employee pays about $7,650 in FICA, while their employer pays another $7,650 that the employee never sees. A self-employed person earning $100,000 pays about $14,130 in SE tax (slightly less due to the 92.35% multiplier). That's roughly $6,480 more out of the self-employed person's pocket compared to the W-2 employee — money that a traditional employer would have absorbed.

This is why many freelancers set their rates 15-30% higher than an equivalent salary. The extra SE tax, plus costs like health insurance, retirement contributions, and no paid time off, mean you need more gross revenue to achieve the same take-home pay.

Yes. You can deduct 50% of your SE tax as an above-the-line deduction on your federal income tax return. This is sometimes called the "employer-equivalent" deduction because it mirrors the tax break W-2 employers get when they pay their half of FICA.

How it works:

• Calculate your total SE tax (e.g., $14,130 on $100,000 net SE income)
• Half of that ($7,065) is deductible from your gross income
• This reduces your adjusted gross income (AGI), which in turn reduces your federal and state income tax
• It does not reduce your SE tax itself — it only reduces your income tax

Important: This is an "above-the-line" deduction, meaning you get it whether you itemize deductions or take the standard deduction. You claim it on Schedule 1 of Form 1040, line 15 ("Deductible part of self-employment tax").

Example impact: If you're in the 24% federal bracket and deduct $7,065, that saves you roughly $1,696 in federal income tax. Add state tax savings (at, say, 5%) and the total benefit is about $2,049. It's not nothing — but it only offsets a fraction of the full SE tax bill.

The Qualified Business Income (QBI) deduction, created by the Tax Cuts and Jobs Act of 2017 under Section 199A, allows eligible self-employed individuals and small business owners to deduct up to 20% of their qualified business income from their taxable income.

Key rules:

• Who qualifies: Sole proprietors, partnerships, S-corps, and LLCs taxed as pass-through entities. C-corps do not qualify.
• Income limits (2025): The full 20% deduction is available without restrictions if taxable income is below approximately $191,950 (single) or $383,900 (MFJ). Above those thresholds, the deduction may be limited or phased out, especially for specified service businesses (law, medicine, consulting, financial services, etc.).
• What it reduces: The QBI deduction reduces your income tax only — it does NOT reduce your SE tax. Your SE tax bill stays the same regardless of QBI.
• Sunset provision: The QBI deduction is currently set to expire after 2025 unless Congress extends it.

Example: If your net SE income is $100,000 and you qualify for the full QBI deduction, you can deduct $20,000 from your taxable income. At a 24% federal rate, that saves $4,800 in income tax. This is in addition to the deductible half of SE tax.

This calculator does not include QBI because eligibility depends on your specific business type and income level, but for most freelancers under the income limits, it's a significant tax saver worth discussing with a tax professional.

Retirement contributions are one of the most powerful tax-reduction tools available to self-employed individuals. While contributions don't directly reduce your SE tax, they significantly lower your income tax and let your money grow tax-deferred.

Main options for the self-employed:

• SEP-IRA: Contribute up to 25% of net SE income (after the deductible half of SE tax), with a maximum of $70,000 in 2025. Simple to set up, no annual filing required. The downside: no employee (elective deferral) contributions, so the limit is purely based on your income percentage.
• Solo 401(k): Allows both employee deferrals (up to $23,500 in 2025, plus $7,500 catch-up if age 50+) and employer contributions (up to 25% of net SE income). The combined limit is $70,000 ($77,500 with catch-up). This typically allows higher contributions than a SEP-IRA at lower income levels.
• SIMPLE IRA: Employee contributions up to $16,500 in 2025, plus a mandatory employer match. Less common for solo freelancers but available.

Tax impact example: A freelancer earning $100,000 net who contributes $20,000 to a Solo 401(k) reduces their taxable income by $20,000. At a 24% federal rate plus 5% state rate, that saves $5,800 in income taxes while building retirement wealth.

Important nuance: Retirement contributions reduce income tax but do NOT reduce SE tax. Your SE tax is calculated on net self-employment income before retirement contributions. So while a $20,000 SEP-IRA contribution saves you ~$5,800 in income tax, your SE tax remains the same.

Self-employment income includes any income you earn from carrying on a trade or business as a sole proprietor, independent contractor, or member of a partnership. The IRS uses a broad definition, and several types of income that might surprise you are subject to SE tax.

Income subject to SE tax:

• 1099-NEC income — Freelancing, consulting, contract work, and gig economy earnings (Uber, DoorDash, Fiverr, Upwork, etc.)
• Schedule C business income — Any trade or business you operate as a sole proprietor
• General partnership income — Your distributive share of partnership income if you materially participate
• Farm income — Reported on Schedule F

Income NOT subject to SE tax:

• W-2 wages — Already subject to employee FICA
• Rental income — Generally passive, not subject to SE tax (with exceptions for real estate professionals)
• Interest and dividends — Investment income, not earned income
• Capital gains — From selling investments
• S-corp distributions — Only S-corp wages are subject to FICA, not distributions (this is a major tax planning strategy)
• Limited partnership income — If you're a limited partner who doesn't materially participate

Important threshold: You must file Schedule SE and pay SE tax if your net self-employment earnings are $400 or more in a tax year. Below that threshold, no SE tax is due, but you should still report the income.