All calculators

107 free UK tax calculators across 7 categories. Every one shows the tax year it used and the rules it applied.

Showing 97–107 of 107

Tax Rebate CheckerMost UK taxpayers overpay. Answer a few quick questions and check what tax you could be owed - the rebates, reliefs and allowances you're missing, how much each is worth to you, and exactly how to claim it back.
Tax-Free Childcare CalculatorOur tax-free childcare calculator shows exactly how much the government will add to your childcare costs in just a few seconds. For every £8 you pay into your childcare account, the government adds £2 - that is a 25% boost on top of what you contribute, up to £2,000 per child a year (£4,000 if your child is disabled). Enter your expected childcare spending below to see your potential top-up instantly, helping you plan nursery, childminder and after-school fees with confidence.
VAT CalculatorThis VAT calculator adds or removes UK VAT from any price in seconds, at the standard 20% rate or the reduced 5% rate. Type in a figure, choose whether it already includes VAT, and you get the net price, the VAT amount and the gross price side by side. It is built for sole traders, freelancers, small business owners and anyone checking a quote, an invoice or a receipt. No sign-up, no spreadsheet, and the same maths HMRC expects you to use. Below the tool you will find the formulas spelled out, worked examples with real numbers, and the mistakes that catch people out most often.
VAT Invoice CheckerThis VAT invoice checker tells you whether the document in front of you is a valid full VAT invoice you can actually reclaim VAT on. If a single required detail is missing, HMRC can refuse your input tax claim and you will have paid the VAT without getting it back. The tool runs through HMRC's checklist for you so you do not have to memorise it. It is for VAT-registered sole traders, limited companies and bookkeepers in the UK who want to clear the doubt before adding an invoice to a VAT return. Paste or enter the invoice details, and it flags what is present, what is missing and whether the document counts as full, simplified or neither.
VAT Number ValidatorOur UK VAT number checker lets you confirm whether a VAT number is correctly formatted and passes the HMRC checksum before you trust it on an invoice. Enter a GB number and we instantly validate its length and run the official mod-97 calculation, so you can catch typos and obvious mistakes in seconds. This is a format and checksum test, not a live registration lookup, so it helps you spot numbers that cannot be genuine before you reclaim input VAT or raise paperwork. Use it as a quick first line of defence whenever you receive a supplier invoice.
Lifetime ISA CalculatorA Lifetime ISA (LISA) gives you a 25% government bonus on up to £4,000 a year - up to £1,000 of free money - to put towards your first home or retirement. This calculator projects your pot, including the bonus and any investment growth, year by year.
Director's Loan CalculatorIf you take money out of your company beyond your salary, dividends or expenses, it goes on your director's loan account . This calculator works out the S455 tax on an overdrawn loan and the benefit-in-kind cost when the loan is over £10,000.
Couples Tax OptimiserThe UK taxes individuals, not households. The same savings account can be tax-free in one partner's name and taxed at 40% in the other's. Enter your figures above and see what holding the money in the right name would save, every year.
Pay Rise Tax Trap CalculatorBetween £60,000 and £125,140 the UK tax system hides three cliff edges where a rise can be taxed at 60%, 70% or effectively more than 100% for a family using childcare. Enter your rise above: we show what you really keep and the exact pension contribution that dodges the cliff.
Buy-to-Let Profit CalculatorThis buy-to-let profit calculator shows what you actually keep after costs and tax - including the Section 24 rules that stop individual landlords deducting mortgage interest, and corporation tax if you hold the property in a limited company.
PAYE vs Self-Employed CalculatorEarning the same money as a salary or as self-employed profit leaves you with different take-home pay - mostly because of National Insurance. This calculator compares both side by side for 2026/27, so you can see the real difference.

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