Tax year 2026 only. Income tax brackets and VAT withholding rates were verified against GİB on 6 Sep 2026, ITO fees against the 2026 İTO tariff on 16 Sep 2026. Other years are rejected with an error; rates are updated each January.
Turkish tax calculators in TypeScript, extracted from Muhasebeci.ai.
- Income tax (gelir vergisi): 2026 brackets for wage and non-wage income, with a per-bracket breakdown.
- VAT withholding (KDV tevkifat): inclusive/exclusive amounts, withholding shares, invoice threshold.
- ITO fees: Istanbul Chamber of Commerce registry fees from a validated tariff.
Cent-precise integer and BigInt math (no floating-point rounding). Every rate links to its official GİB / İTO source.
import { parseTaxAmount, calculateIncomeTax } from "tr-vergi";
const result = calculateIncomeTax(parseTaxAmount("850.000"), "wage");npm install
npm testResults are estimates, not tax advice.
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