How to Calculate UK VAT (Add and Remove 20%)
Short answer
Standard UK VAT is often 20%. Gross = net × 1.20. Net = gross ÷ 1.20. Example: net 50 → VAT 10 → gross 60.
UK invoices and receipts mix VAT-inclusive and exclusive prices. Adding is easy; removing is where people subtract 20% by mistake.
Add 20% VAT
VAT = net × 0.20gross = net × 1.20
Remove 20% VAT
net = gross ÷ 1.20VAT = gross − net
Wrong method: taking 20% off the gross. Right method: divide by 1.20. On a 60 gross price, net = 50, not 48.
Tool
Use the sales tax, GST & VAT calculator in add or remove mode. Cross-check percentages with the percentage calculator.
Rates change by product
Some goods are reduced-rated or zero-rated. Confirm the current rate for your category on GOV.UK before filing returns.
Open the free discount calculator to check your result.
See also: how to calculate sales tax.
See also: how to calculate percentage of a number.
See also: how to calculate discount percentage.
More worked numbers
Change one input at a time so you build intuition. Write the formula, substitute values, then confirm with the free sales tax calculator. If the tool disagrees with your hand math, check units first (months vs years, percent vs decimal, inclusive ranges).
Common mistakes to avoid
- Mixing up percent and decimal forms (15% is 0.15, not 15).
- Using the wrong base when calculating a change or a reverse percentage.
- Ignoring fees, tax or daylight saving when the real-world total depends on them.
- Rounding too early in multi-step arithmetic.
How to practise
Invent three mini-problems from your own life — a bill, a grade, a trip, a loan quote — and solve them on paper before you open the calculator. Teaching the steps to someone else is one of the fastest ways to lock in the method.
Related tools on ViralScopeHub
After you finish this guide, explore the linked tools above and the related articles for neighbouring skills. Our calculators run privately in your browser with no sign-up, so you can check homework, budgets or work estimates without uploading data.
Quick reference card
Keep the short answer box at the top of this page as your cheat sheet. When a search result brought you here for a specific phrase, that box is designed to match the query with the formula first, then the examples below fill in the judgement calls.
Frequently asked questions
How do I add 20% VAT?
Multiply the net amount by 1.20. Double-check units and confirm with the linked tool on this page before you rely on the figure for money or school decisions.
How do I remove VAT from a total?
Divide the gross by 1.20 — do not subtract 20% of the gross. Double-check units and confirm with the linked tool on this page before you rely on the figure for money or school decisions.
Is VAT always 20% in the UK?
No. 20% is the standard rate; reduced and zero rates exist. Double-check units and confirm with the linked tool on this page before you rely on the figure for money or school decisions.
Is VAT the same as US sales tax?
Similar idea, different rules. See our sales tax guide for US-style add/remove. Double-check units and confirm with the linked tool on this page before you rely on the figure for money or school decisions.