Business Calculators
Calculators built for sole traders, contractors and small-business owners — every UK rule decoded.
Business Calculators (15)
Sole Trader Tax Calculator
Self-employed Income Tax + Class 2 / 4 NI.
Most usedCorporation Tax Calculator
Small and main rate, with marginal relief.
Dividend vs Salary Optimiser
Find the tax-efficient split for company directors.
Most usedVAT Calculator
Add or remove VAT at 20%, 5% or 0% — instantly.
Most usedFlat Rate VAT Calculator
Compare standard vs flat-rate VAT for your trade.
CIS Deduction Calculator
Construction Industry Scheme net pay after deductions.
IR35 Take-Home Calculator
Inside vs outside IR35 contractor income.
Business Mileage Calculator
HMRC-approved mileage rates for cars and bikes.
Allowable Expenses Checker
Quick check on what's actually deductible.
Employer NI Calculator
True cost of hiring including secondary Class 1.
Gross Profit Margin
Margins, markups and break-even from your numbers.
Retail Markup Calculator
Hit a target price or margin from a cost.
Accurate & Reliable
All calculations use official UK data and trusted sources.
Fast & Easy
Get answers in seconds with simple and intuitive tools.
Private & Secure
We don't store your personal information — ever.
Built for Real Life
Designed for students, workers, families and homeowners.
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.