Fast calculator view for mobile and desktop
UK business tax
VAT Calculator
Add VAT to a net price or remove VAT from a gross amount for invoices, quotes, and UK business pricing checks.
When to use this VAT calculator
Use this when you need a quick VAT-inclusive total for a quote, invoice, purchase check, or selling price.
What to check next
Confirm whether your starting amount is before VAT or already includes VAT before using the result on a quote or invoice.
Where people usually get VAT math wrong
A common mistake is adding VAT twice because the starting number was already tax-inclusive. Another is removing VAT by subtracting a flat percentage from the total instead of properly reversing the tax.
This page is designed for those quick checks: if you only have the net amount, add VAT; if you only have the gross total, back out the VAT and net amount cleanly before you use it elsewhere.
Who should use this VAT calculator
This calculator is useful for UK freelancers, agencies, consultants, e-commerce sellers, and small business users checking quotes, invoices, or tax-inclusive selling prices.
Frequently asked questions
Can I use this to add VAT to a price?
Yes. Enter the pre-tax amount and the VAT rate to estimate the total with VAT included.
Is this suitable for final tax filing?
It is best used as a fast estimate. For formal filing or compliance, users should confirm final amounts independently.
Example calculation
Example: if your net price is 100 and the VAT rate is 20%, the VAT amount is 20 and the total with VAT is 120.
Related tools
Related tax tools include the GST/HST Calculator, the GST Calculator Australia, and the GST Calculator NZ.