How to add or remove VAT from a price in the UK
Understand VAT-inclusive and VAT-exclusive prices, calculate net and gross amounts, and avoid common mistakes when checking UK invoices and quotes.
VAT questions often come down to one small but important detail: are you starting with a net price before VAT, or a gross price that already includes VAT? Adding 20% to a net price is not the same operation as removing VAT from a VAT-inclusive price. Mixing those up creates invoice errors, margin mistakes, and confusing quotes.
This guide focuses on everyday UK VAT checks. It is not tax advice, and VAT rules can be more detailed than a quick calculator can cover. For common price checks, though, the basic arithmetic is straightforward once net, VAT, and gross are separated.
Net, VAT, and gross prices
The net price is the amount before VAT. The VAT amount is the tax added to that net price. The gross price is the total including VAT. If an item is GBP100 net and the VAT rate is 20%, the VAT amount is GBP20 and the gross price is GBP120.
Invoices and quotes should make this clear, but product pages and receipts do not always do so. Business-to-business prices may be shown excluding VAT, while consumer-facing prices are often shown including VAT. When comparing suppliers, check that you are comparing the same basis.
How to add VAT to a net price
To add VAT, multiply the net amount by one plus the VAT rate. At 20%, multiply by 1.20. At 5%, multiply by 1.05. The difference between the gross and net amount is the VAT. This is the simple part because you are adding a percentage of the original net value.
If you are preparing a quick quote or checking a supplier estimate, the UK VAT Calculator on Daily Utility Dock can show the net, VAT, and gross figures side by side so you do not have to keep the formulas in your head.
How to remove VAT from a gross price
Removing VAT is where many mistakes happen. You do not subtract 20% from a VAT-inclusive price to remove 20% VAT. A GBP120 gross price includes GBP20 VAT and GBP100 net. Subtracting 20% from GBP120 would give GBP96, which is wrong.
To remove 20% VAT, divide the gross amount by 1.20 to find the net amount. Then subtract the net from the gross to find the VAT amount. For a 5% rate, divide by 1.05.
Know which VAT rate applies
The UK standard VAT rate is 20%, but some goods and services may use a reduced rate, zero rate, or exemptions. A calculator can handle the arithmetic for rates you enter or select, but it cannot decide the correct tax treatment for a particular business scenario.
For official decisions, check HMRC guidance or speak to an accountant. For everyday checking, make sure the rate on your invoice or quote matches what you expected before comparing totals.
Common VAT comparison mistakes
The most common mistake is comparing one supplier's VAT-exclusive price with another supplier's VAT-inclusive price. Another is treating the VAT amount as profit, which it is not. VAT collected from customers may need to be paid to HMRC depending on registration and scheme details.
When checking prices, write down three columns: net, VAT, and gross. If one figure is missing, calculate it before making the decision. Clear columns prevent small percentage errors from becoming expensive misunderstandings.
Use VAT checks before accepting a quote
Before approving a supplier quote, ask whether the figure is inclusive or exclusive of VAT, then calculate the missing values yourself. This is especially useful when several quotes use different wording. A cheaper-looking price can become more expensive once VAT and delivery are included.
For small business estimates, keep the VAT calculation beside the customer-facing total. It helps you explain the price, check that invoice software is configured correctly, and spot cases where a reduced or zero rate needs proper confirmation rather than a quick assumption.
Frequently Asked Questions
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