Free calculators for UK trades and the self-employed
Every calculator uses the 2026/27 rates (and 2025/26 where you might still be filing), shows its working and runs entirely in your browser.
CIS & your tax bill
Check CIS deductions, estimate a refund and plan for January and July.
CIS Tax & Refund Calculator
Check the CIS that should have been taken, spot deductions on materials, and estimate your refund or bill.
Open calculator →Tax Set-Aside Calculator
How much to put aside from each invoice, week or month for Income Tax and Class 4 NI, after any CIS.
Open calculator →Payments on Account Calculator
Your 31 January and 31 July payments, the balancing payment, and whether CIS means you owe none.
Open calculator →Pricing & pay
Know what to charge and what you actually keep.
Day Rate Calculator
The day rate you need for the take-home you want, or what your current rate really leaves you.
Open calculator →Holiday and sick-day cost
What a week off really costs you, and how much to save for it.
Job quote builder
Price a job from labour days, materials and your margin.
Rules & thresholds
MTD and VAT: whether the rules apply to you, and from when.
Making Tax Digital Checker
Do you need MTD for Income Tax, and from when? Uses the £50k, £30k and £20k thresholds.
Open calculator →VAT Threshold Tracker
Track your rolling 12-month turnover against £90,000 and see when you would have to register.
Open calculator →Mileage claim calculator
Your mileage claim at the right rate for each tax year.
Cards marked “Planned” are ideas we’re working on. Tell us what you’d find useful at [email protected].