US Self-Employment Tax Calculator

About US Self-Employment Tax Calculator

How Self-Employment Tax Is Calculated

SE tax is computed in four steps using the formulas on IRS Schedule SE. The starting point is your net profit from Schedule C (gross receipts minus ordinary and necessary business expenses), not your gross revenue.

Step 1: SE Tax Base = Net Self-Employment Income x 92.35%

Step 2: Social Security tax: 12.4% on the first $184,500 of SE tax base (2026 wage base per SSA)

Step 3: Medicare tax: 2.9% on the entire SE tax base (no cap)

Step 4: Additional Medicare tax: 0.9% on SE income above $200,000 (single/HoH) or $250,000 (MFJ)

Worked example: $100,000 net self-employment income (single filer) for tax year 2026:

• SE tax base: $100,000 x 0.9235 = $92,350
• Social Security: $92,350 x 12.4% = $11,451.40
• Medicare: $92,350 x 2.9% = $2,678.15
• Additional Medicare: $0 (under $200,000 threshold)
• Total SE tax: $14,129.55
• Deductible portion (50%): $7,064.78 - this reduces AGI for income tax, not SE tax itself

At a 22% marginal income tax bracket, the deduction saves roughly $1,554, so the net federal tax cost of the SE income beyond ordinary income tax is about $12,576.

SE Tax at Different 2026 Income Levels

Social Security caps at $184,500 of SE tax base ($22,878 maximum SS component). Medicare never caps, which is why the effective SE rate drops at higher incomes but never hits zero.

Net SE Income	SE Tax Base (92.35%)	SS Tax (12.4%)	Medicare (2.9%)	Total SE Tax	Effective Rate
$50,000	$46,175	$5,726	$1,339	$7,065	14.13%
$75,000	$69,263	$8,589	$2,009	$10,598	14.13%
$100,000	$92,350	$11,451	$2,678	$14,130	14.13%
$150,000	$138,525	$17,177	$4,017	$21,194	14.13%
$200,000	$184,700	$22,878*	$5,356	$28,234	14.12%
$250,000	$230,875	$22,878*	$6,695 + $278**	$29,851	11.94%
$350,000	$323,225	$22,878*	$9,374 + $1,110**	$33,362	9.53%

* Social Security tax caps at the first $184,500 of SE tax base ($22,878 maximum for 2026)

** Additional 0.9% Medicare tax on SE income above $200,000 for single filers (no employer-match equivalent)

Self-Employed vs W-2 Employee: Who Really Pays More?

A W-2 employee pays FICA at 7.65% while the employer pays the matching 7.65%. A self-employed person pays both halves - 15.3% - but the 92.35% adjustment and 50% deduction partially equalise the burden. The practical difference on $100,000 of earned income is around $4,900 of extra net federal tax.

Tax Component	W-2 Employee	Self-Employed
Social Security (employee share)	6.2%	12.4% (both halves)
Medicare (employee share)	1.45%	2.9% (both halves)
Total FICA rate	7.65%	15.3%
On $100,000 income	$7,650	$14,130 (after 92.35% adjustment)
50% above-the-line deduction	N/A	Approx. $1,554 income tax savings at 22%
Net extra cost of self-employment	-	Approx. $4,900

Self-employed workers also lose access to employer-paid benefits (health insurance, 401(k) match, disability), so the real gap is usually larger than the federal tax difference alone. Many freelancers price their rates 25-35% above the equivalent W-2 hourly wage to cover SE tax, benefits, and unpaid admin time.

Why Does the 92.35% Factor Exist?

The 92.35% multiplier (100% minus 7.65%) exists to mirror how W-2 employees are treated. A W-2 employee does not pay FICA on the employer's share of FICA because that employer share never lands in the worker's gross wages. Since a self-employed individual is effectively both employer and employee, the IRS removes the implicit "employer's share" (7.65%) from the tax base before applying the combined 15.3% rate. Without this adjustment, self-employed people would pay SE tax on a larger base than comparable employees, which would breach the parity principle Congress wrote into the Self-Employment Contributions Act of 1954.

What About S-Corp Salary-and-Distributions?

Operating through an S-Corp can lower SE tax because only the W-2 salary portion is subject to FICA - distributions are not. The IRS still requires a "reasonable compensation" salary based on comparable industry wages; a $200,000 profit split 50/50 between $100,000 salary and $100,000 distribution avoids roughly $14,130 of SE tax on the distribution half. S-Corps carry added cost (payroll filings, corporate return, state fees), so the breakeven typically starts around $50,000-$80,000 of net profit. Consult a CPA before electing S-Corp status; the IRS actively audits for unreasonably low salaries used to dodge SE tax.

Quarterly Estimated Tax Payments for 2026

Self-employed individuals must make quarterly estimated payments via Form 1040-ES to avoid underpayment penalties. The IRS expects tax to be paid as income is earned, not just at year-end. Due dates for tax year 2026 (from the 2026 Form 1040-ES instructions):

Quarter	Income Period	Due Date
Q1	Jan 1 - Mar 31, 2026	April 15, 2026
Q2	Apr 1 - May 31, 2026	June 15, 2026
Q3	Jun 1 - Aug 31, 2026	September 15, 2026
Q4	Sep 1 - Dec 31, 2026	January 15, 2027

To avoid penalty, pay the lesser of 90% of current-year tax or 100% of last year's tax (110% if prior-year AGI exceeded $150,000). Many freelancers set aside 25-30% of each invoice in a dedicated account to cover SE tax and federal income tax together, then top up quarterly.

Common SE Tax Deductions That Reduce Your Base

Only Schedule C business expenses reduce your SE tax base. Personal deductions like retirement contributions and health insurance reduce income tax but leave SE tax untouched. Typical deductions that do flow through to the SE tax base:

• Home office: Simplified method at $5 per square foot up to 300 sq ft ($1,500 cap) or the actual-expense method covering utilities, mortgage interest, and depreciation
• Business vehicle: Standard mileage at 72.5 cents per business mile for 2026 (IRS Notice 2026-10, up 2.5 cents from 2025) or actual fuel, maintenance, insurance, and depreciation
• Equipment and software: Laptop, camera gear, design tools, SaaS subscriptions - expensed in year of purchase under Section 179 up to $1.29 million (2026 limit)
• Supplies and professional services: Accounting fees, legal fees, contract labor paid via 1099-NEC
• Travel and meals: 100% of business travel, 50% of qualifying business meals per IRS Publication 463
• Advertising and marketing: Website hosting, ads, business cards, conference fees

Deductions that reduce income tax ONLY (not SE tax): self-employed health insurance deduction, Solo 401(k) and SEP-IRA contributions, half of SE tax itself, and the QBI deduction. Getting this distinction wrong inflates perceived tax savings.

Common Mistakes Freelancers Make

• Forgetting SE tax exists. First-year freelancers often plan only for income tax and get blindsided in April by an extra 14% bill.
• Missing the 92.35% adjustment. Calculating 15.3% on the full net income overstates the bill by about 7.65% and inflates quarterly payments.
• Skipping quarterly payments. The IRS safe-harbour rule doesn't forgive year-end catch-ups; underpayment penalties compound at the federal short-term rate plus 3%, currently around 8%.
• Confusing gross receipts with net profit. SE tax runs on Schedule C line 31 (net profit), not gross revenue. Track every deductible expense.
• Electing S-Corp too early. The payroll-filing overhead typically exceeds SE tax savings below $50,000 net profit.

How SE Tax Funds Social Security Benefits

The 12.4% Social Security portion of SE tax buys retirement, disability, and survivor benefits. To qualify for retirement benefits you need 40 quarters of coverage (10 years). In 2026, one quarter of coverage is credited for every $1,810 of self-employment earnings reported, up to four quarters per year per the SSA. Your eventual retirement benefit is based on the 35 highest-earning years of covered wages indexed for inflation, so consistent reporting - even at lower levels - matters more than most freelancers realise.

The Medicare portion (2.9% + 0.9% surtax at high incomes) funds Part A hospital coverage. Unlike Social Security, Medicare eligibility at 65 requires 40 quarters of work credits but does not depend on earnings level. Underreporting net earnings to dodge SE tax directly cuts your future Social Security benefit and can leave you short of the 40-quarter threshold.

SE Tax Planning Strategies That Actually Work

Strategy	Savings Mechanism	Best For
Track every Schedule C expense	Each $1,000 in deductions saves $141 of SE tax plus income tax	All freelancers
Home office deduction	Up to $1,500 simplified or actual expenses pro-rated by square footage	Remote workers with a dedicated space
S-Corp election	Distributions above reasonable W-2 salary avoid SE tax	Net profit above $50,000-$80,000
Solo 401(k)	Up to $70,000 in 2026 ($77,500 age 50+) - reduces income tax only	Consistent six-figure freelancers
SEP-IRA	Up to 25% of net SE earnings, $70,000 cap - reduces income tax only	Variable income, simple admin
Hire family members	Shifts income to lower bracket; children under 18 exempt from FICA in sole prop	Spouses and older children with real roles

For the full federal income tax picture including brackets and the QBI deduction, use the US income tax calculator. To model Solo 401(k) and SEP-IRA contributions alongside SE tax, the 401(k) calculator handles both employee and employer contribution limits. For quick gross-to-net freelance rate conversions, try the hourly to salary converter.

All calculations run entirely in your browser. No personal or financial data is stored or transmitted.

Sources

• SSA - Contribution and Benefit Base ($184,500 for 2026)
• IRS - Self-Employment Tax (Social Security and Medicare)
• IRS - About Schedule SE (Form 1040)
• IRS - 2026 Form 1040-ES Estimated Tax for Individuals (PDF)
• IRS - 2026 Standard Mileage Rate (72.5 cents/mile)
• IRS - Topic No. 554, Self-Employment Tax
• IRS - Topic No. 751, Social Security and Medicare Withholding Rates