About Contractor Calculator
What is Contractor Calculator?
Contractor Calculator (contractorcalc.co.uk) is a free suite of UK tax calculators designed for contractors, freelancers, and sole traders. All calculations use officially published HMRC tax rates and are updated annually. The site is independent and does not provide financial advice.
Our Calculators
- Compare Structures — Compare take-home pay across PAYE, Limited Company, and Sole Trader structures
- Monthly Income Planner — See your expected income month by month with real working days and pension contributions
- Day Rate Calculator — Find the daily rate you need to charge for your target income
- Dividend vs Salary Calculator — Optimise your limited company income extraction
- Late Payment Interest Calculator — Calculate statutory interest on unpaid invoices
- IR35 Status Estimator — Quick assessment of your likely IR35 status
Tax Year and Accuracy
All calculators use HMRC published rates for the 2025/26 tax year (6 April 2025 to 5 April 2026). Rates are sourced directly from GOV.UK and stored in a single configuration file that is updated each April when new rates are announced.
While we strive for accuracy, these calculators provide estimates for general guidance. They do not account for all individual circumstances. Always consult a qualified accountant or tax advisor for your specific situation.
These calculations are estimates based on current published tax rates. They do not constitute financial, tax, or legal advice. Always consult a qualified accountant for your specific situation.
Tax rates sourced from HMRC published rates for the 2025/26 tax year. Last verified: March 2026.