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Business calculator · 2025/26
VAT Calculator UK
Quick UK VAT calculator. Add or remove VAT at any rate. Net to gross or gross to net in one click.
How this is calculated
The maths, in plain English.
VAT in the UK is generally either standard rate (20%), reduced rate (5%), or zero rate (0%).
- To add VAT (net to gross): multiply the net amount by 1.20 (or 1.05, or 1.00).
- To remove VAT (gross to net): divide the gross amount by 1.20 (or 1.05, or 1.00).
This calculator does both, plus shows the VAT amount separately. Useful for invoicing, expense tracking, or quickly working out the VAT element on a receipt.
Remember: if you're VAT-registered you charge VAT on sales (output VAT) and can reclaim VAT on business purchases (input VAT). The difference is what you pay HMRC quarterly.
3 questions we get asked.
If yours is not here, ring us. We answer in four rings on weekdays and write back the same day on emails.
01 When do I have to register for VAT?
If your VAT-able turnover exceeds £90,000 in any rolling 12-month period (2025/26 threshold) you must register. You can also register voluntarily below the threshold — useful if you sell mostly to other VAT-registered businesses or if you have a lot of input VAT to claim.
02 What's the difference between standard, reduced, and zero rates?
Standard 20% applies to most goods and services. Reduced 5% covers things like domestic energy, children's car seats, and some other categories. Zero 0% applies to most food, books, children's clothes, and various others. Zero-rated is still VAT-able (you charge 0%) — different from exempt (where you don't charge VAT but also can't reclaim input VAT).
03 What is the Flat Rate Scheme?
A simplified VAT scheme for businesses with turnover under £150,000. You pay HMRC a flat percentage of gross turnover instead of calculating per-transaction. Used to be a great deal for service businesses; since the 'limited cost trader' changes it's much less so. We model both schemes when you near the threshold.
One call. Twenty minutes.
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