Transparency & Accuracy

How Our VAT Calculator Works

Full transparency on the formulas, data sources, and methodology used by VATCalculatorUK.com — so you can trust every calculation for your UK business.

The HMRC Formulas We Use

All calculations on this site use the exact formulas specified by HMRC for UK VAT. There is no rounding at intermediate steps — we calculate to full precision and display to 2 decimal places.

Adding VAT (standard 20%)

Gross = Net × 1.20

e.g. £1,000 × 1.20 = £1,200

Removing VAT (reverse calculation)

Net = Gross ÷ 1.20

e.g. £1,200 ÷ 1.20 = £1,000

General formula (any rate)

Gross = Net × (1 + rate/100)

Works for 20%, 5%, and 0%

Our VAT Rate Sources

All VAT rates used on this site are sourced directly from HMRC GOV.UK and updated whenever HMRC announces changes.

✓ HMRC Current UK VAT Rates (2026)

20% Standard rate — most goods and services. Source: HMRC GOV.UK
5% Reduced rate — domestic energy, children's car seats, mobility aids
0% Zero rate — most food, children's clothing, books, newspapers

Rates last verified: January 2026. Verify current rates at HMRC →

What Our Calculator Does NOT Do

It does not provide legal or tax advice — always consult HMRC or a qualified accountant for your specific situation
It does not submit VAT returns — for Making Tax Digital (MTD) submissions you need HMRC-approved software
It does not determine which VAT rate applies to your specific goods or services — check with HMRC if you are unsure
It does not account for VAT exemptions, partial exemption, or special accounting schemes beyond the Flat Rate Scheme

Accuracy Commitment

We are committed to maintaining accurate, up-to-date VAT calculations. If you believe you have found an error, please contact us immediately.

Calculations use full floating-point precision before rounding to 2 decimal places for display
VAT rates are checked against HMRC GOV.UK on a regular basis
All pages display the year of the rate source (2026) so you can verify currency
We link directly to HMRC GOV.UK on every page for independent verification

Ready to use our free UK VAT calculator?

Calculate VAT Now →