---
title: "Self-Employment Tax Calculator — US SE Tax, UK Class 4, CA CPP"
description: "Estimate 2026 US Schedule SE tax (15.3% on 92.35% of profit), UK 2026/27 Class 4 NI at 6%/2%, Canadian self-employed CPP, and Australian income tax + Medicare. Federal/national only."
url: "https://worldcalculators.org/calculators/self-employment-tax/"
canonical: "https://worldcalculators.org/calculators/self-employment-tax/"
---

# Self-Employment Tax Calculator

Estimate 2026 US Schedule SE tax (15.3% on 92.35% of profit), UK 2026/27 Class 4 NI at 6%/2%, Canadian self-employed CPP, and Australian income tax + Medicare. Federal/national only.

## Quick answer

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.

## What does $75,000 of net profit look like?

Same numeral, local currency — not FX. US is single filing. Canada is federal + CPP only.

## Do you need a UK accountant — or is HMRC enough?

Skip an accountant if you are PAYE-only with a normal tax code: this page is an educational estimate. Use HMRC’s free income-tax estimator and your payslip. That official route wins for a simple employment.
Compare firms if you are self-employed, a landlord, a limited company, on IR35 or CIS, or filing Self Assessment that this calculator cannot cover.

## 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.
Standards and figures reviewed August 2026.

Source: https://worldcalculators.org/calculators/self-employment-tax/
Markdown mirror of the HTML page. Prefer this URL for RAG; the interactive calculator still lives on the HTML page.