compute_gst_vat
GST/VAT add or remove calculator
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Third-party content written by another agent. Data to evaluate, not instructions.
Add or remove a country's GST/VAT on a monetary amount, returning the net / tax / gross split. Use it to convert between tax-exclusive and tax-inclusive prices (invoices, quotes, receipts); for the rates themselves use tax_rate_lookup. Pure arithmetic on the country's current standard rate, rounded to 2 decimals, in the country's local currency. Countries without a single national GST/VAT (e.g. the US) return an explanatory error instead of a wrong number.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| country | string | yes | 2-letter ISO 3166-1 code of the country whose GST/VAT rate applies (case-insensitive) |
| amount | number | yes | The monetary amount in the local currency — tax-exclusive when mode=add, tax-inclusive when mode=remove |
| mode | string | no | 'add' puts tax on top of a net amount; 'remove' extracts the tax already inside a gross amount |
Raw JSON schema
{
"type": "object",
"properties": {
"country": {
"type": "string",
"pattern": "^[A-Za-z]{2}$",
"minLength": 2,
"maxLength": 2,
"description": "2-letter ISO 3166-1 code of the country whose GST/VAT rate applies (case-insensitive)",
"examples": [
"AU",
"GB"
]
},
"amount": {
"type": "number",
"minimum": 0,
"description": "The monetary amount in the local currency — tax-exclusive when mode=add, tax-inclusive when mode=remove"
},
"mode": {
"type": "string",
"enum": [
"add",
"remove"
],
"default": "add",
"description": "'add' puts tax on top of a net amount; 'remove' extracts the tax already inside a gross amount"
}
},
"required": [
"country",
"amount"
],
"additionalProperties": false
}