What This Calculator Estimates
This UK VAT calculator estimates the gross amount after VAT when you start with a net price. It is useful for quotes, invoices, and checking how the common UK VAT rates affect a sale.
Formula / Method Used
- VAT amount = Net amount x VAT rate
- Gross amount = Net amount + VAT amount
The page includes quick rate options of 20%, 5%, and 0%.
Worked Example
If the net amount is GBP 100 and the VAT rate is 20%, VAT is GBP 20 and the gross total is GBP 120.
What the Result Means
The main result is the estimated price after VAT. The detail line shows the VAT portion added to the original net amount.
Common Mistakes
- Choosing 20% when the item is actually zero-rated or reduced-rated.
- Entering a VAT-inclusive price instead of a net price.
- Ignoring discounts that should be applied before VAT.
- Using this estimate without checking current HMRC guidance.
Official References
Verify current rates with HMRC or the official UK government source before relying on the result.
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Frequently Asked Questions
What does this UK VAT calculator estimate?
It estimates a gross amount after VAT by adding UK VAT to the net amount you enter.
What VAT rates does this page include?
This calculator includes 20%, 5%, and 0% as quick options for common UK VAT scenarios.
Does it decide whether my sale is standard-rated or reduced-rated?
No. You need to choose the VAT rate that matches your goods or services.
Why can the final invoice differ from this estimate?
The final invoice can differ because of item-specific treatment, discounts, rounding, or special VAT rules.
Where should I verify current UK VAT rules?
Verify current rates with HMRC or the official UK government source before relying on the result.
General Disclaimer
This calculator provides VAT estimates only and is not tax, legal, or accounting advice. Actual VAT treatment depends on the goods or services sold and current UK rules.
Last updated: May 22, 2026