⚠️ Educational only. TaxPlain does not provide tax, legal, or financial advice. Always consult a qualified tax professional about your specific situation.
What it is
Self-employment tax is how freelancers, gig workers, and sole proprietors pay into Social Security and Medicare. When you work for an employer, they withhold 7.65% from your paycheck and pay another 7.65% themselves — that's FICA. When you work for yourself, you pay both halves: 15.3% total on your net business earnings.
This is separate from income tax. Many new freelancers budget for income tax but forget self-employment tax entirely — then get hit with a surprise bill in April. Self-employment tax is calculated on Schedule SE and reported on your Form 1040 under "Other Taxes."
Who must pay
✓ You owe SE tax if...
Your net self-employment earnings are $400 or more in a year. That includes freelance income, gig economy work (Uber, DoorDash, Etsy), sole proprietorship profits, and single-member LLC income reported on Schedule C.
↑ You may not owe if...
Net self-employment earnings are under $400, or your only income is from W-2 employment (your employer already withheld FICA). Church employee income over $108.28 also triggers SE tax under special rules.
📅 When it's due
Self-employment tax is due with your annual return by April 15 — but you should pay it throughout the year via quarterly estimated tax payments (Form 1040-ES). Waiting until April to pay the full year's SE tax plus income tax often triggers underpayment penalties.
How it's calculated
The 15.3% breakdown
Schedule SE walks through the math. Here's what each piece means in plain English:
Net earnings from self-employment — Your Schedule C net profit (or 92.35% of it, to be precise — the IRS gives you a small adjustment so you're not taxed on the employer-equivalent portion twice).
Social Security tax — 12.4% — Applies only up to the wage base ($168,600 in 2024). Earnings above that cap are not subject to the 12.4% Social Security portion.
Medicare tax — 2.9% — Applies to all net self-employment earnings with no cap.
Additional Medicare — 0.9% — Extra surtax on earnings over $200,000 (single) or $250,000 (married filing jointly). This stacks on top of the base 2.9%.
Total: 15.3% — On net earnings up to the Social Security wage base. Above the cap, only the 2.9% (or 3.8%) Medicare portion applies.
Deductible half — You can deduct 50% of your self-employment tax as an above-the-line adjustment on your 1040 (Schedule 1, Line 15). This partially offsets the employer-equivalent portion you paid.
💡 Quick example
If your Schedule C net profit is $60,000, your self-employment tax is roughly $8,478 (15.3% × $60,000 × 92.35%). You'd also owe federal income tax on the $60,000 at your regular bracket. Set aside roughly 25–30% of net self-employment income to cover both taxes combined.
Employees vs. self-employed
Understanding the difference explains why self-employment tax catches people off guard:
W-2 employee — Pays 7.65% via paycheck withholding (Social Security + Medicare). Employer pays the other 7.65% behind the scenes. You never see the employer's half on your pay stub.
Self-employed — Pays the full 15.3% yourself via Schedule SE. No employer to split the cost. This is on top of federal and state income tax.
W-2 + side gig — If you have a day job and freelance on the side, your employer withholds FICA on wages up to the wage base. Your side income still triggers SE tax, but the Social Security portion may be reduced if you already hit the cap through W-2 wages.
S-corp strategy — Some self-employed people form an S-corp and pay themselves a reasonable W-2 salary (subject to FICA) plus distributions (not subject to SE tax). This can reduce SE tax but adds payroll complexity and IRS scrutiny on "reasonable salary."
Common mistakes to avoid
⚠️ No quarterly payments
Self-employment tax isn't withheld automatically. If you wait until April 15 to pay the full year, you'll owe interest and possibly an underpayment penalty. Pay estimated taxes quarterly via Form 1040-ES.
⚠️ Underpricing your work
Many freelancers quote rates based on take-home pay without accounting for the extra 15.3%. A $50/hour rate as an employee is not equivalent to $50/hour as a freelancer — you need roughly 15% more to break even on FICA alone.
⚠️ Ignoring business deductions
SE tax is calculated on net profit, not gross income. Every legitimate Schedule C deduction reduces both your income tax and your self-employment tax. Skipping deductions costs you twice.
⚠️ Forgetting the deductible half
The deduction for 50% of your SE tax is easy to miss if you file manually. Tax software handles it automatically — make sure Line 15 of Schedule 1 is populated.
What to do right now
Open a separate savings account and transfer 25–30% of every self-employment payment you receive — that's your tax fund. Pay quarterly estimated taxes (April 15, June 15, September 15, January 15) using IRS Direct Pay or EFTPS. Track all business expenses on Schedule C to lower your net profit and therefore your SE tax. If your net self-employment income exceeds $60,000–$80,000, ask a tax professional whether an S-corp election makes sense — the SE tax savings can be substantial.
Questions to ask your tax professional
01How much should I set aside per payment for income tax plus self-employment tax combined?
02Am I paying enough in quarterly estimated taxes to avoid underpayment penalties?
03Did my W-2 job already max out the Social Security wage base, reducing SE tax on my side income?
04Would forming an S-corp save me enough in self-employment tax to justify the added cost and complexity?
05Am I missing Schedule C deductions that would lower my net earnings and SE tax?
06Do I need to pay SE tax on church or clergy income, and are there special rules that apply?
Frequently asked questions
Is self-employment tax the same as income tax?
No. They're completely separate. Income tax is based on your total taxable income across all sources and runs through the normal tax brackets (10%–37%). Self-employment tax is specifically for Social Security and Medicare funding, fixed at 15.3% on net self-employment earnings (up to the wage base). You pay both.
What's the difference between FICA and self-employment tax?
They're the same taxes — Social Security and Medicare — just collected differently. FICA is withheld from employee paychecks (7.65% employee + 7.65% employer). Self-employment tax is the self-employed person's version of both halves combined (15.3%). The rates and wage bases are identical.
Do I pay self-employment tax on every dollar I earn?
You pay it on net self-employment earnings — profit after business expenses — not gross revenue. If you earned $80,000 in freelance income but had $20,000 in business expenses, your net is $60,000 and SE tax is calculated on that $60,000 (specifically, 92.35% of it per Schedule SE).
What form do I use to calculate self-employment tax?
Schedule SE (Self-Employment Tax). It takes your net profit from Schedule C (or other self-employment income) and calculates the 15.3% tax. The result flows to Schedule 2 of your 1040 under "Other Taxes." Most tax software generates Schedule SE automatically when you enter Schedule C data.
Can I reduce or avoid self-employment tax?
You can reduce it by maximizing legitimate business deductions (lowering net profit), forming an S-corp and taking a reasonable salary plus distributions, or contributing to a SEP-IRA or Solo 401(k) which reduces net earnings. You cannot avoid it entirely on true self-employment income — it's the cost of funding your own Social Security and Medicare benefits in retirement.