temsor API
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Turkish VAT & Withholding

Splits a Turkish amount into net, VAT and (optionally) withholding: who pays the seller, who remits the withheld VAT.

POST /v1/tr/vat · 1 credit · deterministic

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POST/v1/tr/vat
{
  "amount": 1000,
  "rate": 20
}
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Why this exists

Built for hostile input

A Turkish address arrives as "Cd." or "Cad." or "Caddesi", with the flat number glued to the building number. Generic parsers drop half of it silently. This one tells you what it could not place.

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Turkey1

/v1/tr/vat Turkish VAT & Withholding deterministic 1 credit

Splits a Turkish amount into net, VAT and (optionally) withholding: who pays the seller, who remits the withheld VAT.

For invoice lines and checkout totals that have to show KDV dahil / hariç and, when the parties are in a withholding (tevkifat) situation, the split between what the buyer pays the seller and what the buyer remits to the tax office. Rates are 0, 1, 10 and 20 percent. Withholding is a fraction of the VAT (2/10 through 10/10), or a named code from the GİB partial-withholding list. The 2026 threshold (TRY 12,000 gross) is reported and compared with the amount, but `applies` is always null: whether withholding actually applies depends on the taxpayer status of both parties, which this endpoint does not know. Feeding it a fraction is not a legal opinion.

Parameters

amount* number The amount to tax. See amountIncludesVat.
amountIncludesVat boolean If true, `amount` is the gross (KDV dahil); if false, it is the net/matrah. default false
rate number | number | number | number VAT rate in percent. 0, 1, 10 or 20. default 20
withholding string Withholding fraction such as "5/10", or a code from the list (reklam, tasima, hurda, isgucu…).
POST/v1/tr/vat
{
  "amount": 1000,
  "rate": 20
}
no request sent yet
Press Run to call the live API from your browser.

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Use it from an AI assistantthe same catalogue, exposed as MCP tools

Every endpoint is also published over the Model Context Protocol, so Claude, ChatGPT or your own agent can call it directly — no glue code, no wrapper functions. The assistant sees the same input schemas and the same metering.

Currently 25 tools. New endpoints appear automatically; nothing to update on your side.

claude_desktop_config.json

{
  "mcpServers": {
    "temsor": {
      "url": "https://api.temsor.com/mcp",
      "headers": { "x-api-key": "fk_live_…" }
    }
  }
}

Quickstart

Official client: npm install temsor-api · npmjs.com/package/temsor-api

Node.js

import Client from "temsor-api";

const api = new Client({ apiKey: KEY });
const r = await api.${(() => {
  const first = apis[0];
  return first.slug.split(/[/-]/).map((p, i) => (i === 0 ? p : p[0].toUpperCase() + p.slice(1))).join('');
})()}(${esc(JSON.stringify(apis[0].examples[0]?.input ?? {}))});
console.log(r, r.$meta);

cURL

curl -s https://api.temsor.com/v1/tr/vat \
  -H "content-type: application/json" \
  -H "x-api-key: fk_live_…" \
  -d '{"amount":1000,"rate":20}'

JavaScript

const res = await fetch("https://api.temsor.com/v1/tr/vat", {
  method: "POST",
  headers: { "content-type": "application/json", "x-api-key": KEY },
  body: JSON.stringify({"amount":1000,"rate":20})
});
const { data } = await res.json();

Python

import httpx
r = httpx.post("https://api.temsor.com/v1/tr/vat",
    headers={"x-api-key": KEY},
    json={"amount":1000,"rate":20})
data = r.json()["data"]