Self-Employment Tax Calculator — Know Your SE Tax
By Sanjeet Singh, CPA
Self-employment tax is the 15.3% charge that catches most independent workers off guard. It covers Social Security (12.4%) and Medicare (2.9%) — the same taxes W-2 employees split with their employer. When you're self-employed, you pay both halves. The silver lining: you can deduct half of your SE tax from your adjusted gross income, which lowers your income tax. Enter your self-employment income below to see exactly how much SE tax you owe and what your quarterly payment should be.
SE tax calculators typically show you the tax number alone. Here, you see how SE tax stacks on top of your W-2 income and what your real quarterly payment should be — that's the number that matters for IRS Direct Pay.
Filing Info
Income
$0.70/mile (2025 IRS rate)
Estimated Total Tax
$14,681
Effective rate: 21.9%
Quarterly Payment
$3,670
Tax Breakdown
What Is Self-Employment Tax?
If you work for yourself — freelancing, contracting, driving for DoorDash, selling on Etsy, or running any kind of solo business — you pay a tax that W-2 employees never think about. It's called self-employment tax, and it's 15.3% of your net earnings.
That 15.3% breaks down into two pieces: 12.4% for Social Security and 2.9% for Medicare. If those numbers sound familiar, it's because W-2 employees pay the same taxes — but they only see half. Their employer quietly pays the other half. When you're self-employed, you're both the employee and the employer, so you pay the full 15.3%.
Here's the key threshold: you owe self-employment tax once you earn $400 or more in net self-employment income in a year. That's net — meaning after you subtract business expenses like software subscriptions, home office costs, and mileage. Below $400, no SE tax. Above it, the full 15.3% kicks in.
Who pays it? Freelancers, independent contractors, gig workers, sole proprietors, and single-member LLC owners. If you receive a 1099-NEC (or should receive one), you almost certainly owe SE tax.
You report self-employment tax on Schedule SE, which gets filed with your Form 1040.
How Self-Employment Tax Is Calculated (Worked Example)
Let's walk through a real example. Say you're a single filer with $75,000 in net freelance income after business deductions.
Step 1: Apply the 92.35% adjustment. The IRS doesn't tax 100% of your self-employment income. You multiply by 92.35% first — this mirrors the fact that employers get to deduct their half of FICA taxes.
$75,000 × 92.35% = $69,263 (this is your adjusted SE earnings)
Step 2: Calculate the 15.3% SE tax. $69,263 × 15.3% = $10,597 in self-employment tax
Breaking that down: $69,263 × 12.4% = $8,589 for Social Security, and $69,263 × 2.9% = $2,009 for Medicare.
Step 3: Take the 50% deduction. Here's a bright spot: you get to deduct half of your SE tax from your adjusted gross income (AGI). This doesn't reduce the SE tax itself — it reduces the income you pay income tax on.
$10,597 ÷ 2 = $5,299 deducted from AGI
Step 4: See the downstream effect. Your AGI drops from $75,000 to $69,701 ($75,000 minus $5,299). After the $15,000 standard deduction (single filer, 2025), your taxable income for federal income tax purposes is $54,701. That 50% deduction just saved you roughly $1,200 in income taxes — on top of your standard deduction.
Two important caps to know:
The Social Security wage base for 2025 is $176,100. Once your combined W-2 wages plus SE earnings hit that cap, the 12.4% Social Security portion stops. The 2.9% Medicare portion has no cap — it applies to every dollar.
The Additional Medicare Tax adds an extra 0.9% on self-employment earnings above $200,000 (single) or $250,000 (married filing jointly). So high earners pay 3.8% Medicare instead of 2.9% on income above those thresholds.
SE Tax vs. Income Tax — They're Different
This trips up a lot of first-time freelancers: self-employment tax and income tax are two separate taxes, and you pay both on the same freelance earnings.
Self-employment tax is flat. It's 15.3% regardless of whether you earn $5,000 or $500,000 (up to the Social Security wage base). There are no brackets, no progressive rates.
Income tax is progressive. The first $11,925 of taxable income (single, 2025) is taxed at 10%. The next chunk at 12%, then 22%, and so on up through 37%.
On that $75,000 freelance example, here's the combined picture:
- SE tax: $10,597 (flat 15.3% on adjusted earnings) - Federal income tax: approximately $7,760 (progressive brackets on $54,701 taxable income) - Combined federal tax: approximately $18,357
That's an effective federal rate of about 24.5% — and we haven't added state taxes yet. This is why quarterly estimated payments matter so much for self-employed people.
One more nuance: the 50% SE tax deduction reduces your income tax but does not reduce your self-employment tax. The $10,597 SE tax is locked in regardless. The deduction only softens the income tax bill.
How to Reduce Your Self-Employment Tax
You can't eliminate SE tax entirely (short of not earning self-employment income), but there are legitimate strategies to reduce it.
Maximize business deductions. Every dollar you deduct from gross revenue reduces your net SE income — and that reduces both your SE tax and income tax. Common deductions: home office (simplified method: $5/sq ft, up to 300 sq ft), business mileage ($0.70/mile for 2025), software and subscriptions, equipment, professional development, and health insurance premiums (self-employed health insurance deduction).
Consider an S-Corp election. This is the most powerful SE tax reduction strategy for freelancers earning above approximately $80,000-$100,000. With an S-Corp, you pay yourself a "reasonable salary" (which is subject to payroll taxes), and take the rest as distributions (which are not subject to SE tax). On $120,000 of net income with a $70,000 salary, you'd save roughly $7,650 in SE tax compared to a sole proprietorship. Important caveat: the IRS requires a "reasonable salary," and determining what's reasonable requires professional review. Use Qalm's S-Corp comparison calculator to see if the numbers make sense for your situation.
Contribute to a SEP-IRA or Solo 401(k). These retirement plans let you shelter a significant portion of income from income tax (up to $69,000 for 2025 with a Solo 401(k)). They don't directly reduce SE tax — SE tax is calculated before retirement contributions — but they substantially reduce your income tax bill.
Claim the QBI deduction. The Qualified Business Income deduction (Section 199A) lets you deduct up to 20% of your qualified business income from your taxable income. This reduces income tax, not SE tax, but it's a significant savings. Phase-outs begin at $191,950 (single) and $383,900 (married filing jointly) for specified service trades or businesses.
Quarterly Payments for Self-Employed
If you expect to owe $1,000 or more in taxes for the year (including SE tax and income tax combined), the IRS expects you to make quarterly estimated payments. Miss them and you'll face an underpayment penalty — roughly 8% annual interest on the shortfall.
2025/2026 quarterly deadlines:
- Q1 (January–March income): April 15, 2026 - Q2 (April–May income): June 15, 2026 - Q3 (June–August income): September 15, 2026 - Q4 (September–December income): January 15, 2027
Pay via IRS Direct Pay at irs.gov/directpay using Form 1040-ES. It's free, instant, and you get a confirmation number.
Safe harbor rule: If you pay at least 100% of last year's total tax liability across your four quarterly payments, you won't owe an underpayment penalty — even if you end up owing more this year. If your AGI was above $150,000 last year, the safe harbor threshold is 110% of last year's tax.
Use Qalm's combined calculator to estimate your quarterly payment amount across all your income streams — W-2, freelance, and rental combined.
Frequently Asked Questions
How much is self-employment tax on $50,000?
On $50,000 of net self-employment income: $50,000 × 92.35% = $46,175 adjusted earnings. $46,175 × 15.3% = $7,065 in SE tax. You'd also get a $3,533 deduction against your AGI (50% of $7,065). Use the calculator above to see your exact estimate including state taxes and income tax.
Is self-employment tax the same as income tax?
No. Self-employment tax (15.3%) covers Social Security and Medicare. Income tax is the separate federal tax based on progressive brackets (10% to 37%). You pay both on freelance earnings. The 50% SE tax deduction reduces your income tax but not your SE tax. They're calculated independently and added together on your Form 1040.
Do I pay SE tax on rental income?
Generally, no. Rental income from real estate is not subject to self-employment tax in most cases. It's considered passive income and is taxed as regular income only. The exception: if you're a real estate professional who materially participates in rental activities, or if you provide substantial services to tenants (like a bed-and-breakfast), the income may be subject to SE tax. Short-term rentals under the 14-day rule (Section 280A) are tax-free entirely.
Can I reduce SE tax by forming an LLC?
A single-member LLC is a "disregarded entity" for federal tax purposes — meaning the IRS treats it exactly like a sole proprietorship. Forming an LLC alone does not change your SE tax. However, an LLC can elect to be taxed as an S-Corp (by filing Form 2553), which does reduce SE tax by splitting income into salary and distributions. The LLC provides liability protection regardless of tax election.
At what income level should I consider an S-Corp?
The general rule of thumb is $80,000-$100,000 in net self-employment income. Below that, the administrative costs of S-Corp compliance (separate payroll, additional tax returns, state filings) often outweigh the SE tax savings. Above $100,000, the savings typically justify the overhead. At $120,000 net income with a $70,000 reasonable salary, you could save approximately $7,650 in SE tax annually. Check Qalm's S-Corp calculator to model your specific scenario. Always consult a CPA or tax professional before making the S-Corp election — reasonable salary determination requires professional review.
Can I reduce my self-employment tax?
Business expenses reduce your net SE income, which reduces SE tax. An S-Corp election can also help — by paying yourself a reasonable salary, the remaining profit is distributed without SE tax. Use our S-Corp calculator to see if this saves you money.
Do I owe SE tax on rental income?
Generally no. Rental income is passive income and not subject to SE tax. However, if you provide substantial services (like running a bed-and-breakfast), the IRS may classify it as active income subject to SE tax.
Related Calculators
Need the full picture?
Combine W-2, freelance, and rental income into one complete tax estimate with our full calculator.