Browse 15 UK calculators in this category. Existing calculators keep their original URLs.
Self-Employed Tax Calculator
Estimate Income Tax, Class 4 NI and take-home pay for sole traders.
Side Hustle Tax Calculator
Calculate tax on additional income alongside employment.
CIS Tax Calculator
Estimate Construction Industry Scheme deductions and refunds.
IR35 Calculator
Compare inside and outside IR35 contractor take-home pay.
Business Expense Calculator
Total allowable business expenses and estimate their effect on taxable profit.
Mileage Claim Calculator
Estimate a 2026/27 simplified mileage claim for business journeys.
Working From Home Calculator
Calculate the self-employed simplified home-working expense.
Payments on Account Calculator
Estimate January and July Self Assessment payments on account.
VAT Registration Calculator
Check taxable turnover against the UK VAT registration threshold.
Self Assessment Penalty Calculator
Estimate combined late-filing and late-payment charges.
Late Filing Penalty Calculator
Estimate penalties for filing a Self Assessment return late.
Late Payment Interest Calculator
Estimate HMRC simple interest on overdue Self Assessment tax.
Construction Industry Expense Calculator
Summarise construction income, CIS deductions and allowable expenses.
Freelancer Day Rate Calculator
Work out a sustainable freelance day rate from an income target and costs.
Freelancer Hourly Rate Calculator
Calculate a sustainable freelance hourly rate.