Free Tax Tools for UK Self-Employed People
No sign-up required. Use these free calculators and checkers to understand your tax obligations, maximise your deductions, and keep more of what you earn.
Tax Calculator
Calculate your Income Tax and National Insurance as a self-employed person. Interactive sliders with a real-time HMRC-rate breakdown.
Mileage Calculator
Enter your business miles and instantly see your HMRC mileage allowance deduction. See how much tax you could save with proper mileage tracking.
Expense Checker
Find out which expenses you can claim as a self-employed person. Detailed HMRC guidance for all 14 allowable expense categories.
Built for real tax decisions
Each tool answers a specific question self-employed drivers ask before they file: how much tax is due, whether mileage or actual costs gives the better deduction, and which receipts are worth keeping.
Use the calculators before year end
The numbers are most useful while there is still time to act. Checking mileage, expenses, and profit during the tax year helps you avoid a January scramble and gives a clearer view of what to set aside.
Turn estimates into records
These free tools are entry points. Fyled stores the records, keeps receipts attached to the right category, and prepares the figures you need for Self Assessment and Making Tax Digital.
Want all these calculations done automatically?
Sign up for Fyled and get real-time tax tracking, automatic mileage deductions, and HMRC-ready filing packs -- all from one dashboard.
Get started for free