Free tools
Free UK tax & invoicing tools for sole traders.
Calculators we use ourselves. No signup. No email wall. Just answers — built to HMRC's published rules.
UK VAT calculator
Add or remove VAT at 20%, 5% or 0% — for sole traders, freelancers and tradespeople.
Use calculatorHMRC mileage calculator
Work out your business mileage claim at HMRC's approved 45p / 25p rates.
Use calculatorSelf-employed tax calculator 2026/27
Estimate Income Tax and Class 4 NI on your self-employment profit.
Use calculatorLate payment interest calculator
Calculate UK statutory late payment interest (Bank of England base + 8%) on overdue invoices.
Use calculator
Browse Ovaro
For your trade
Free tools
Resources
- Making Tax Digital guide
- HMRC-recognised software
- Pricing
- FAQ
- Blog
- Making Tax Digital for Income Tax: what April 2026 actually means for UK sole traders
- Voice invoicing: how UK tradespeople send a legal invoice from the van in under 30 seconds
- Allowable expenses for UK sole traders: the HMRC categories explained