Sole traders · Ltd companies · 2025/26
UK freelance & business calculators, in plain English
Calculators built for sole traders, contractors and small-business owners — every UK rule decoded.
Available now
15 calculators- business
Sole Trader Tax Calculator
Self-employed Income Tax + Class 2 / 4 NI.
Open calculator - business
Corporation Tax Calculator
Small and main rate, with marginal relief.
Open calculator - business
Dividend vs Salary Optimiser
Find the tax-efficient split for company directors.
Open calculator - business
VAT Calculator
Add or remove VAT at 20%, 5% or 0% — instantly.
Open calculator - business
Flat Rate VAT Calculator
Compare standard vs flat-rate VAT for your trade.
Open calculator - business
CIS Deduction Calculator
Construction Industry Scheme net pay after deductions.
Open calculator - business
IR35 Take-Home Calculator
Inside vs outside IR35 contractor income.
Open calculator - business
Business Mileage Calculator
HMRC-approved mileage rates for cars and bikes.
Open calculator - business
Allowable Expenses Checker
Quick check on what's actually deductible.
Open calculator - business
Employer NI Calculator
True cost of hiring including secondary Class 1.
Open calculator - business
Gross Profit Margin
Margins, markups and break-even from your numbers.
Open calculator - business
Retail Markup Calculator
Hit a target price or margin from a cost.
Open calculator - business
Break-Even Calculator
Find your business break-even volume.
Open calculator - business
Small Business Rates Relief
Check business-rates eligibility by rateable value.
Open calculator - business
Payment on Account Estimator
Predict your Self-Assessment January and July bills.
Open calculator
Tools for the self-employed
Working for yourself means doing your own maths — Self-Assessment, VAT returns, IR35 status, payments on account. These calculators give you straight answers without an accountant’s clock running.