---
title: "VAT / GST for 16 major economies (UK, EU, Australia, Canada, Japan, Singapore, UAE, India, and more) at the verified 2026 standard rate — add or remove."
method: POST
path: "/v1/commerce/vat-gst"
tags: ["Commerce"]
---

# VAT / GST for 16 major economies (UK, EU, Australia, Canada, Japan, Singapore, UAE, India, and more) at the verified 2026 standard rate — add or remove.

`POST /v1/commerce/vat-gst`

## Request

- Base URL: `` (relative, and it does not resolve against the document’s source URL)
- URL: `/v1/commerce/vat-gst`
- Auth: none declared

VAT / GST for 16 major economies (UK, EU, Australia, Canada, Japan, Singapore, UAE, India, and more) at the verified 2026 standard rate — add or remove.

Payment: x402 ($0.05 USDC on eip155:8453). Call unpaid to receive an HTTP 402 with requirements, then retry with the PAYMENT-SIGNATURE header. Method: add: vat = amount*rate/100, gross = amount+vat; remove: net = amount/(1+rate/100), vat = amount-net

## Request body

- object
  - `country` string, required: ISO country code, e.g. GB, DE, AU, SG, IN
  - `amount` number, required
  - `mode` 'add' | 'remove'

## Response `200`

Verified result + provenance (formula, sources, reproducible SHA-256 hash).

## Other responses

- `400`: Invalid input (no charge) — body echoes the JSON Schema.
- `402`: Payment required — PAYMENT-REQUIRED header carries the x402 accepts[] quote.

---

[API](https://skmtc.dev/x402toll/apis/tollbooth-verified-calculators-for-ai-agents.md) · [All operations](https://skmtc.dev/x402toll/apis/tollbooth-verified-calculators-for-ai-agents/llms.txt) · [OpenAPI document](https://skmtc.dev/x402toll/apis/tollbooth-verified-calculators-for-ai-agents/revisions/60cb70a3e1a5?raw)