VAT

What this does

Calculates VAT on a pound amount. Choose add to go from net to gross (typical shelf price), or remove to extract VAT from a VAT-inclusive total. You set the VAT rate (20% is standard in the UK).

Who it is for

Invoices and quotes
Spreadsheet pricing columns
Small shops checking till totals
Apps displaying both ex-VAT and inc-VAT prices

Try it

Add 20% VAT to £100 net:

https://fetch.li/v1/vat?amount=100&rate=20&mode=add

Remove VAT from £120 gross:

https://fetch.li/v1/vat?amount=120&rate=20&mode=remove

Reduced rate example:

https://fetch.li/v1/vat?amount=50&rate=5&mode=add

HTTP example

GET /v1/vat?amount=100&rate=20&mode=add HTTP/1.1
Host: fetch.li
Accept: application/json

curl

curl -sS "https://fetch.li/v1/vat?amount=100&rate=20&mode=add"

JavaScript fetch

const params = new URLSearchParams({
  amount: "100",
  rate: "20",
  mode: "add",
});
const response = await fetch(`https://fetch.li/v1/vat?${params}`);
const vat = await response.json();
console.log(vat.gross, vat.vat, vat.net);

Python requests

import requests

response = requests.get(
    "https://fetch.li/v1/vat",
    params={"amount": 100, "rate": 20, "mode": "add"},
)
response.raise_for_status()
vat = response.json()
print(vat["net"], vat["vat"], vat["gross"])

Example JSON response

Mode add:

{
  "mode": "add",
  "rate_percent": 20,
  "net": 100,
  "vat": 20,
  "gross": 120,
  "currency": "GBP"
}

Mode remove (same numbers, different interpretation of amount input as gross):

{
  "mode": "remove",
  "rate_percent": 20,
  "net": 100,
  "vat": 20,
  "gross": 120,
  "currency": "GBP"
}

Parameters

Parameter	Required	Type	Description
`amount`	Yes	number	Pound amount to transform (net if `add`, gross if `remove`)
`rate`	Yes	number	VAT rate as a percentage (e.g. `20`, `5`, `0`)
`mode`	Yes	string	`add` (net → gross) or `remove` (gross → net)

Errors that can happen

HTTP	`error.code`	When
400	`invalid_body`	Missing parameter, negative amount, invalid `mode`, or rate out of range
429	`rate_limited`	Demo limit exceeded
500	`internal`	Unexpected server error

Demo

GET endpoints work without an API key on the public demo tier (60 calls per hour per IP). POST /v1/vibe/classify needs a key.

Try it

GET https://fetch.li/v1/vat

Answer

Response

response