# VAT Calculator

> Add VAT to a net amount or remove VAT from a gross amount.

Page: https://askcalculators.com/calculator/vat-calculator/
Definition: https://askcalculators.com/calculator/vat-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/vat-calculator/schema.json
Version: 1.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/vat-calculator/?mode=add&amount=100&vatRate=20

## Inputs
- mode: Calculation; type=select; required; default=add; values=add|remove
- amount: Amount; type=money; required; default=100; min=0
- vatRate: VAT rate; type=percent; required; default=20; min=0; max=100

## Outputs
- grossAmount: Gross amount; format=currency; primary
- netAmount: Net amount; format=currency
- vatAmount: VAT amount; format=currency

## Formula
Add: gross = net × (1 + rate); remove: net = gross ÷ (1 + rate)

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.