Is this validation performed on government servers?

No. For your security and confidentiality, the verification is structural and runs entirely inside your local browser.

India TAN Validator

Validate India Tax Deduction and Collection Account Numbers (TAN). Checks Modulo 26 checksums.

Enter TAN to validate

Need a mock TAN number for testing?

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The validator checks if the input is exactly 10 characters and matches the standard regex layout `AAAA11111A` (4 letters, 5 digits, 1 letter).

It evaluates the weighted Modulo 26 sum of the first 9 positions and confirms if the output maps to the 10th checksum letter.