How to Calculate VAT in the UK (Add or Remove VAT)
Learn how VAT calculations work in the UK (add/remove VAT), when to use net vs gross prices, and how to avoid common invoice mistakes.
Rates and rules can change. This guide is for general understanding—always check official GOV.UK guidance for the latest.
Net vs Gross: what your numbers really mean
In everyday UK pricing, you’ll see both net (before VAT) and gross (after VAT) amounts.
Knowing which one you’re looking at prevents invoice errors and customer disputes.
- Net price = amount before VAT
- VAT amount = tax added on top
- Gross price = net + VAT
Add VAT to a net price (the quick method)
If you have a net price and want the total payable, you add VAT.
For the standard rate, multiply the net price by 1 + VAT rate.
- Example: standard rate uses 1.20 multiplier (for general understanding)
- For reduced/zero-rated items, use the rate that applies to that product/service
Remove VAT from a gross price (reverse VAT)
If you only have the gross price and want the net figure, you reverse the calculation.
Divide the gross amount by 1 + VAT rate to estimate the net.
- Reverse VAT is common when checking receipts or reconciling supplier invoices
FAQ
What’s the difference between net and gross?
Net is before VAT. Gross is after VAT. Always confirm which figure you’re using before invoicing or reporting.
Can VAT rates change?
Yes. VAT rates and rules can change over time. For anything compliance-related, verify the latest rules on GOV.UK/HMRC.
When should I use a VAT calculator?
Use it when preparing invoices, checking receipts, estimating totals, or splitting a gross price into net + VAT for bookkeeping.