Tax
VAT Calculator UK
Add VAT to a net price, remove VAT from a gross price, or calculate the net amount, VAT amount, and gross amount using configured UK rates or a custom rate.
Gross amount
£120.00
Applied VAT rate: 20.00%
- Net amount
- £100.00
- VAT amount
- £20.00
- Gross amount
- £120.00
How to use this VAT calculator
Choose add VAT when you know the net amount, remove VAT when you know the VAT-inclusive gross amount, or calculate VAT portion when you only need the VAT included in a total. Common UK rates come from centralized configuration, and the custom field lets you model another rate.
Net, VAT, and gross amounts
The net amount is the price before VAT. The VAT amount is the tax added at the selected rate. The gross amount is the final VAT-inclusive price. The calculator treats the VAT rate as a decimal multiplier and rounds final displayed values to your selected precision.
Formula
rate_decimal = vat_rate / 100
gross = net * (1 + rate_decimal)
net = gross / (1 + rate_decimal)
vat = gross - netExample
At 20% VAT, a £100 net amount becomes £120 gross. A £120 gross amount contains £20 VAT and £100 net value.
Adding VAT vs removing VAT
Adding VAT starts with the net amount and multiplies it by one plus the VAT rate. Removing VAT starts with the gross amount and divides it by one plus the VAT rate, so the VAT amount is the difference between gross and net.
Important considerations
VAT liability depends on what is supplied, where it is supplied, customer status, registration, exemptions, reverse-charge rules, and invoice requirements.
FAQs
Are VAT rates hardcoded here?
No. Common UK rates come from centralized configuration and the custom input lets you model decimal rates.
Can I remove VAT from a gross price?
Yes. Choose remove VAT, enter the gross price, and the calculator will show the net amount and VAT amount.
Does zero VAT work?
Yes. A 0% rate returns the same net and gross amount with a zero VAT amount.
Which amount should I enter when adding or removing VAT?
Enter the net price when adding VAT and the VAT-inclusive gross price when removing VAT.
Can I use a custom VAT rate?
Yes. Enter the percentage you need in the VAT rate field; the common-rate buttons are optional shortcuts.
Disclaimer
This tool is for arithmetic only and is not tax, VAT, accounting, or legal advice.