About BizTaxCalc

BizTaxCalc is a free online business-tax estimator covering 13 countries. It helps freelancers, sole traders, self-employed professionals and small companies understand — in plain English — how much tax and social contributions they are likely to pay, and to compare regimes and countries side by side.

What we do

For each country we model the real legal forms a small business can use (for example Italy's forfettario, France's micro-entrepreneur, the US sole proprietor / LLC / S-corp / C-corp, the UK sole trader and limited company) and apply the actual tax brackets, coefficients and contribution rules. The result is a transparent, step-by-step breakdown rather than a single opaque number.

Where our figures come from

Every rate is based on official sources — national tax authorities (IRS, HMRC, Agenzia delle Entrate, Belastingdienst, AEAT and others) cross-checked with PwC Worldwide Tax Summaries — for tax years 2025 and 2026. We show the sources on each calculator page.

Our limits

Our estimates cover the main national/federal rules. Local, regional, state, provincial or cantonal taxes vary by location and are not always included; we flag this where relevant. BizTaxCalc is an informational tool and does not replace advice from a licensed tax professional.