When you work for yourself you usually pay both halves of social contributions, then income tax on what is left. This is federal/national only — not a 50-state engine and not a Self Assessment filing.
In short
US: SE tax = net × 0.9235 × 15.3% (SS capped). On $75,000 single this engine shows about $17,101 combined (22.8%). UK Class 4 is 6% then 2%, not the old 9%. Compulsory Class 2 is gone.
At a glance
US $75k combined
$17,101
22.8% · SE + federal, single
UK £75k Class 4
£2,757
6% / 2% · 2026/27
CA $75k CPP
CA$8,461
Both portions · no provincial
AU $75k Medicare
A$1,500
No separate SE tax
Self-employment estimator
2026
Gross revenue minus allowable business expenses. Same numeral in each local currency — not FX.
Nine states levy no wage income tax. Everywhere else adds a state layer we do not compute. Picking a state only tells you what this federal + SE tax estimate is missing.
$10,597
SE tax
$6,504
Income tax
$17,101
Total
$57,899
22.8% effective
Where the money goes
Social Security (12.4% of SE base)$8,589
Medicare (2.9% of SE base)$2,009
Federal income tax$6,504
Left after these taxes$57,899
• SE base = net profit × 0.9235 = $69,263 (Schedule SE).
• Employer-equivalent half of SS + Medicare ($5,299) is deducted before income tax.
• Social Security wage base $184,500. Assumes no W-2 wages.
• State income tax is not modelled.
1
SE earnings base
$75,000 × 0.9235
$69,263
2
SE tax (SS + Medicare)
12.4% + 2.9% on SE base (SS capped)
$10,597
3
Deductible employer half
$5,299
4
Federal income tax
2026 brackets after standard deduction
$6,504
5
Left after federal + SE tax
$75,000 − $17,101
$57,899
What does $75,000 of net profit look like?
Same numeral, local currency — not FX. US is single filing. Canada is federal + CPP only.
Country
Social / SE
Income tax
Left
Effective
🇺🇸 US
$10,597
$6,504
$57,899
22.8%
🇬🇧 UK
£2,757
£17,432
£54,811
26.9%
🇨🇦 Canada
CA$8,461
CA$9,268
CA$57,271
23.6%
🇦🇺 Australia
A$1,500
A$13,020
A$60,480
19.4%
How do the social layers differ?
Country
Social rate
Cap / threshold
Deductible?
🇺🇸 US
15.3% of 92.35% of profit
SS base $184,500
Employer half of SS + Medicare
🇬🇧 UK
Class 4 6% / 2%
£12,570–£50,270
No
🇨🇦 CA
11.90% CPP
YMPE CA$74,600
CPP deduction rules apply; provincial extra
🇦🇺 AU
No SE tax; 2% Medicare
Medicare low-income threshold
N/A
Key takeaways
US SE tax is 15.3% of 92.35% of net profit. SS is capped at $184,500 of SE base in 2026.
UK Class 4 is 6% then 2% in 2026/27. The old 9% main rate is gone. Compulsory Class 2 is not charged.
Canada self-employed CPP is both portions. Provincial tax and CPP2 are not in this estimate.
Australia has no separate SE tax. GST registration depends on turnover, which this net-profit box cannot see.
Pick a US state to see whether it taxes wages. The dollars stay federal.
FAQ
Frequently asked questions
What is the US self-employment tax rate? ▾
SE tax is 15.3% of 92.35% of net profit — 12.4% Social Security (capped at $184,500 of SE base in 2026) plus 2.9% Medicare, plus 0.9% Additional Medicare above $200,000 (single). You deduct the employer-equivalent half of SS + Medicare before income tax. On $75,000 net profit, single, this engine shows about $10,597 SE tax and $6,504 federal income tax.
What is the UK equivalent of self-employment tax? ▾
Sole traders pay Class 4 NI at 6% on profits between £12,570 and £50,270, then 2% above (2026/27). Compulsory Class 2 is not charged. Income tax uses the same personal allowance and bands as employees. On £75,000 this engine shows £2,757 Class 4 and £17,432 income tax.
Do I need an ABN in Australia? ▾
If you are carrying on an enterprise you generally need an ABN. GST registration is required if turnover exceeds A$75,000. There is no US-style SE tax: you pay resident income tax plus the 2% Medicare levy. Super is not auto-deducted for sole traders the way SG is for employees.
How much CPP do self-employed Canadians pay? ▾
Both portions: 11.90% on pensionable earnings between CA$3,500 and CA$74,600. EI is optional and excluded here. Provincial tax is extra. CPP2 is not modelled.
Does this include US state tax? ▾
No. Pick a state in the tool to see whether that state taxes wages — the dollar amounts stay federal + SE tax. We do not ship 50 state engines.
Sources & Methodology
US figures follow Schedule SE (92.35% of net profit, employer-equivalent SS + Medicare, then federal income tax after the deductible half). UK uses Class 4 NI, not employee NI. Canada doubles the employee CPP rate. Australia reuses the resident income-tax + Medicare engine. No state, provincial, or local engines.