Tax Number (VKN)
Check the checksum of a ten-digit Turkish tax number.
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Ten digits. Individuals use their identity number as a tax number instead; this checks the ten-digit form.
Result
Good to know
- Each of the first nine digits is shifted by its distance from the end, weighted by a power of two and reduced mod nine; the tenth completes the total to a multiple of ten.
- Every single mistyped digit is caught, and 96% of swapped neighbouring digits.
- A correct checksum does not make the number a registered taxpayer's. Only the Revenue Administration can say that, and this page makes no request to anyone.
- Nothing you type is sent anywhere or kept.
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