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Tax & business calculators for UK sole traders

Free tools for self-employed tradespeople in the UK. No signup. No fluff. Just the numbers.

Most popular

Sole Trader Tax Calculator

See your income tax and Class 4 National Insurance breakdown. Enter your turnover and allowable expenses — tradesperson categories included.

UK · Updated for 2025/26 tax year

Urgent

MTD Income Threshold Checker

Find out if Making Tax Digital for Income Tax applies to you now. Covers the £50k (2026), £30k (2027), and £20k (2028) thresholds with clear next steps.

UK · April 2026 mandate is live

Late Payment Interest Calculator

Calculate statutory interest on an overdue invoice under the Late Payment of Commercial Debts Act 1998. Bank of England base rate + 8%, applied daily.

UK · Late Payment Act 1998

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AutoInvoice tracks your income so these numbers stay accurate year-round

MTD-compliant digital records from day one. No spreadsheets. No manual totals. Accountant export ready at year-end.

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All calculators are for general guidance only and do not constitute tax, financial, or legal advice. Always consult a qualified accountant or tax adviser for advice specific to your circumstances.