Free UK tax calculators & business tools
Quick, no-sign-up calculators and checkers for the things that matter most. For a precise figure — and a plan to pay less — talk to a real accountant.
Company name checker
Check a UK company name against Companies House naming rules, sensitive words and the “same as” test — then search the live register.
Open toolSalary & dividend calculator
See your take-home pay from a director’s salary plus dividends, after income tax, NI and dividend tax.
Open toolSelf Assessment tax estimator
Estimate the income tax and Class 4 NI due on your self-employed profits, plus payments on account.
Open toolVAT calculator
Add or remove VAT at 20%, 5% or 0% and see the net, VAT and gross amounts instantly.
Open toolCorporation Tax calculator
Estimate your company’s Corporation Tax for 2025/26, including marginal relief between £50k and £250k.
Open toolDividend tax calculator
Work out the tax on your dividends in 2025/26, on top of your salary or other income.
Open toolCapital Gains Tax calculator
Estimate the CGT due when you sell property, shares or other assets in 2025/26.
Open toolCompany car tax calculator
Estimate the benefit-in-kind tax on a company car from its list price, BIK rate and your tax band.
Open toolSole trader tax calculator
See the income tax and National Insurance due on your sole-trader profits, and what you keep.
Open toolRental income tax calculator
Estimate the tax on your rental profit, including the Section 24 mortgage-interest restriction.
Open toolNational Insurance calculator
Estimate the National Insurance you’ll pay as an employee or as a self-employed person in 2025/26.
Open toolInheritance Tax calculator
Estimate the Inheritance Tax on an estate, including the residence nil-rate band and transferable allowances.
Open toolAmazon FBA fee & profit calculator
Work out your Amazon.co.uk referral and FBA fees, then see your net profit and margin per unit.
Open toolMargin & markup calculator
Turn cost and price into gross profit, profit margin and markup — or work out the price to hit a target margin.
Open toolDiscount calculator
Take a percentage off a price to see the sale price and how much you save — or work out the discount %.
Open toolROI calculator
Work out the return on an investment as a percentage and a cash gain, with an optional annualised figure.
Open toolBreak-even calculator
Find how many units you need to sell to cover your costs, from your fixed costs, price and variable cost.
Open toolEBITDA calculator
Add interest, tax, depreciation and amortisation back to profit to find EBITDA and your EBITDA margin.
Open tooleBay fee & profit calculator
Work out your eBay.co.uk final value, fixed and regulatory fees, then see your net profit and margin.
Open toolStamp Duty (SDLT) calculator
Estimate the Stamp Duty Land Tax on a property in England, including the additional-property surcharge.
Open toolEstimates use 2025/26 rates for England and are for general guidance only — not tax advice.
Want the exact figure — and a way to pay less?
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