LedgerKitView all tools

Practical financial tools for UK businesses

Calculate VAT, CIS deductions, profit margins, business mileage and late-payment interest quickly and clearly.

Browse all calculators Open VAT calculator

VAT, made clear.

Worked example

Amount excluding VAT

£1,000.00
Standard VAT rate20%
Net amount
£1,000.00
VAT at 20%
£200.00
Total including VAT
£1,200.00
Clear figures. No spreadsheet needed.
UK-focused
Free to use
No sign-up
Calculations stay in your browser

A clearer answer. A simpler working day.

Five practical tools for the numbers you work with every day.

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Tax & VAT

VAT Calculator

Add VAT, remove VAT or find the VAT portion of an amount.
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Tax & VAT

CIS Calculator

Calculate CIS deductions, VAT and the net payment due to a subcontractor.
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Pricing & profit

Profit Margin Calculator

Compare margin and markup or calculate the selling price required to reach a target.
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Business expenses

Business Mileage Calculator

Estimate the approved mileage amount for business journeys in your own vehicle.
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Getting paid

Late Payment Interest Calculator

Estimate statutory or contractual interest on an overdue business invoice.
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Built for the everyday numbers.

Transparent calculations. Clear result breakdowns. UK-specific rates.
Quick access without registration, so you can get on with the job.

Your figures stay yours.

All calculations happen in your browser. No accounts, no saved figures and no calculation data sent to us.

How we respect your privacy

The rate is never a mystery

Rates are organised by tax year. Each tax-based calculator shows the rate and last-checked date.

See the working, not just the answer

Useful breakdowns and plain-English formulas make every result easier to check.

Estimates, not professional advice

Use results to inform your work. Check official guidance or speak to a qualified professional.

A few useful things to know.

Is LedgerKit free to use?

Yes. All five calculators are free and require no account or subscription.

Are my calculations saved?

No. Inputs and results are held only in the current browser page. Refreshing or leaving clears them. You can copy or print a result yourself.

How often are rates reviewed?

Each tax-based tool shows its configured rates and last-checked date. We review rates when updating the site; there is no live connection to HMRC or the Bank of England. Check the linked official guidance before relying on a result.

Do these results replace an accountant?

No. These are practical estimates, not personalised accounting, tax or legal advice. A qualified professional can consider your circumstances.

Is LedgerKit connected to HMRC?

No. LedgerKit is independent and is not affiliated with or endorsed by HMRC or GOV.UK.