Self-Employment Tax Calculator

How self-employment tax works

When you’re employed, your employer splits social security and Medicare-style payroll taxes with you — they pay half, you pay half. When you’re self-employed, you pay both halves yourself. That’s what most countries call self-employment tax (or its national equivalent). It’s separate from income tax, and most jurisdictions calculate it as a flat percentage on your net business income up to some wage base cap, then a smaller percentage above the cap.

The two-tier structure exists because the social-security portion of these taxes typically funds a benefit (retirement, disability) that has a cap on the income it counts toward. Once your income exceeds that cap, you stop paying into that part. The medicare-style portion usually has no cap and continues at a lower rate on every additional dollar. This calculator models that exact two-tier structure with editable rates and thresholds, so it works for the US, UK, and most countries that use a similar system.

Default values are US 2026: 15.3% on the first $176,100 of net self-employment income (12.4% Social Security + 2.9% Medicare), then 2.9% above the cap (Medicare only — Social Security stops). Net SE income means your gross business revenue minus deductible business expenses. The calculator math has been verified against the IRS Schedule SE worksheet and matches to within rounding for both standard and high-income scenarios.

Self-employment rates by country

Use these as starting points. Always verify against your country’s official tax authority for the current year — rates and thresholds change annually.

United States — 2026 Self-Employment Tax

• Exempt threshold: $0 (technically there’s a $400 minimum-filing trigger, but no exempt amount once you owe)
• Main rate: 15.3% (12.4% Social Security + 2.9% Medicare)
• Wage base cap: $176,100 (2026 Social Security wage base)
• Above-cap rate: 2.9% (Medicare only — SS portion stops)

Note: the IRS allows you to multiply net SE earnings by 0.9235 before calculating SE tax (the “92.35% multiplier”). For simplicity this calculator doesn’t apply that automatically — multiply your income by 0.9235 before entering it for the most accurate US calculation. There’s also an Additional Medicare Tax of 0.9% on earnings above $200,000 (single) or $250,000 (married filing jointly) — not modeled here.

United Kingdom — 2026/27 Class 4 National Insurance

• Exempt threshold: £12,570 (lower profits limit)
• Main rate: 6% (rate between £12,570 and £50,270)
• Wage base cap: £50,270 (upper profits limit)
• Above-cap rate: 2% (rate above £50,270)

Class 2 NIC is separate and is a flat weekly amount (~£3.45/week in 2026) — add that to your calculator result manually if you owe it. Self-employed earners below £6,725 are usually exempt from Class 2 as well.

Germany — Self-employed contributions (approximate)

Germany doesn’t have a “self-employment tax” in the US sense. Self-employed people pay full health insurance (~14.6%) + pension contributions (~18.6% optional, mandatory for some professions) + accident insurance separately, on top of income tax. To approximate this calculator’s role: enter your combined social contribution rate as the main rate, and use the German Beitragsbemessungsgrenze (~€90,600 in 2026) as the cap. For an accurate calculation, use a dedicated German tool or speak to a Steuerberater.

India — Presumptive professional taxation (Section 44ADA)

India doesn’t have self-employment tax. The closest equivalent for freelancers and professionals is presumptive taxation under Section 44ADA: 50% of gross professional receipts is deemed as taxable profit, then taxed at the applicable income-tax slab rate. This isn’t a tier-based payroll tax, so this calculator doesn’t apply cleanly. Use it indirectly: multiply your gross receipts by 0.5 to get presumed profit, then estimate income tax separately.

Canada — CPP contributions for self-employed

• Exempt threshold: C$3,500 (basic exemption)
• Main rate: 11.9% (5.95% × 2, self-employed pay both halves) for 2026
• Wage base cap: C$71,300 (2026 Year’s Maximum Pensionable Earnings)
• Above-cap rate: 0% (CPP stops at YMPE; CPP2 enhanced contribution applies between YMPE and additional cap — use a separate calculation)

Australia — Self-employed don’t pay payroll-equivalent tax

Australia doesn’t impose a separate self-employment tax. Sole traders pay regular income tax plus Medicare Levy (2%) and may have super contribution obligations on their own. The closest use case for this calculator in Australia is modeling the Medicare Levy — set exempt to A$24,276 (low-income threshold), main rate to 2%, no cap.

How to interpret the results

Self-employment tax owed

The total payroll-equivalent tax you’ll owe on your net self-employment income. This is in addition to income tax — both have to be paid. For US sole proprietors, this often comes as a quarterly estimated tax bill alongside federal income tax.

Effective rate

Total SE tax divided by net income. For US filers below the wage base, this equals the main rate (15.3%). For high earners above the wage base, the effective rate drops because the above-cap rate is much lower. A US sole proprietor earning $300,000 has an effective SE tax rate of about 10.8% — well below the 15.3% headline.

Income after SE tax

Net income minus SE tax owed. This is what you have left to pay income tax on (which is a separate calculation) and then fund your life. Don’t mistake this for “take-home pay” — income tax is still ahead of you.

Deductible portion (half)

For US self-employed filers, half of the SE tax can be deducted from gross income on your federal income tax return (the “above-the-line deduction” for half of SE tax). This effectively offsets some of the SE tax burden by reducing your taxable income for federal income tax purposes. Other countries have different rules — UK Class 4 NICs aren’t deductible against income tax, for example. The deductible-half figure is informational; whether you can actually claim it depends on your jurisdiction.

Assumptions and limitations

• Two-tier model only. Real systems sometimes have three or more tiers, additional thresholds (Additional Medicare Tax, UK Class 2, German contribution ceiling differences for east/west), or non-tier calculations entirely (German formula-based contributions, Indian presumptive). The calculator handles the most common structure but won’t capture every nuance.
• No 0.9235 US adjustment. US filers should multiply net SE earnings by 0.9235 before entering for an accurate calculation. The calculator doesn’t apply this automatically because it’s US-specific.
• No Additional Medicare Tax (0.9%). US high earners above $200K/$250K thresholds pay an additional 0.9% — not modeled.
• No income tax integration. SE tax is just one slice of your total tax. Use the Income Tax Estimator separately and add the results for your full tax burden.
• No state, provincial, or local tax. Some US states and Canadian provinces have additional self-employment-style taxes. Calculate separately.
• No quarterly estimated tax breakdown. Most countries require self-employed individuals to pay tax quarterly throughout the year. The calculator gives an annual figure — divide by 4 for a rough quarterly estimate.

Self-employment tax FAQ

Who owes US self-employment tax?

Any US sole proprietor, freelancer, independent contractor, partner in a partnership, or single-member LLC owner with net self-employment earnings of $400 or more in a year. If you’re a W-2 employee with a side gig, you owe SE tax on the side income separately. Earnings below $400 generally don’t trigger SE tax even though you may still owe income tax.

Is self-employment tax the same as income tax?

No — they’re separate. SE tax funds Social Security and Medicare benefits (in the US). Income tax funds general government operations. You pay both. SE tax has a flat-ish rate structure with a cap; income tax has progressive brackets. The Income Tax Estimator on Ladabo handles the other side.

Can I reduce self-employment tax?

A few ways: (1) maximize legitimate business expense deductions to reduce net SE income, (2) consider an S-corp election in the US (lets you split income between salary and distributions, only salary is subject to SE tax — but adds payroll and admin complexity), (3) contribute to retirement accounts that reduce taxable income, (4) for very high earners, structure income to stop at the SS wage base cap. None of these are simple decisions — they all interact with income tax and have non-tax tradeoffs.

Why does the calculator show a “deductible portion”?

US self-employed filers can deduct half of their SE tax from gross income on the federal income tax return. This isn’t a refund — it just reduces what you pay income tax on. For a US sole proprietor in the 22% marginal bracket owing $12,000 in SE tax, the $6,000 deductible portion saves roughly $1,320 in federal income tax. Other countries treat their equivalent taxes differently — UK Class 4 NICs aren’t deductible against income tax, for example.

What if I have both W-2 and self-employment income?

The Social Security portion of SE tax has a combined wage base. If your W-2 employer already withheld SS tax on, say, $100,000 of W-2 wages, you only owe SS-portion SE tax on (cap − $100K) of your SE earnings. Medicare-portion SE tax has no cap so it applies to all SE earnings. This calculator’s wage base cap is a simplification — for mixed-income scenarios, work with an accountant.

How do quarterly estimated taxes relate to this?

Most countries require self-employed earners to pay tax in 4 quarterly installments throughout the year, not as one lump at filing time. The calculator’s annual figure should be divided by 4 (rough estimate) and paid via your country’s quarterly system: US Form 1040-ES, UK Payments on Account, Canada CRA installments, etc. Missing or underpaying quarterly estimates can trigger underpayment penalties.