Free UK tax & accountant calculators

Sole trader tax & NI

Estimate Income Tax and Class 4 National Insurance on your self-employment profit for 2026/27 — see what to set aside for self assessment.

Salary vs dividends

Compare take-home pay for a limited company director across salary and dividend splits.

Corporation tax

Estimate your limited company's Corporation Tax bill at 2026/27 rates, including marginal relief, and see how profit bands change what you pay.

Contractor take-home

Compare take-home pay outside IR35 (your own limited company) against inside IR35 (umbrella).

Take-home pay

Work out your net salary after Income Tax, National Insurance, and pension contributions.

VAT calculator

Add or remove VAT from a price at the standard, reduced, or zero rate — instant UK VAT maths for invoices, quotes, and receipts.

Accountant fees

Estimate what an accountant should cost your business — monthly and annual ranges from UK fee benchmarks.

Late filing penalty

Estimate Companies House and HMRC self assessment penalties for a late filing — see how fines escalate the longer accounts or returns are overdue.

Do I need MTD?

Check whether Making Tax Digital applies to you in 2026, 2027 or 2028 — VAT, Income Tax, and why Corporation Tax is not in MTD.

Late payment interest

Work out statutory interest and compensation you can charge on overdue business invoices (Bank of England base rate + 8%).