What is a Philippine TIN?

The TIN (Tax Identification Number) is issued by the Bureau of Internal Revenue (BIR). The core is 9 digits, usually written NNN-NNN-NNN, with an optional branch code appended (000 for the head office).

Why is there no pass or fail check digit?

The BIR check-digit algorithm is not publicly documented, so a tool can only verify the length and branch structure. This validator does exactly that and never claims a number is genuine.

Is my TIN uploaded anywhere?

No. Everything runs in your browser using client-side JavaScript — nothing is uploaded or stored.

Philippines TIN Validator

Philippine TIN validator

Check the structure of a Philippine TIN (Tax Identification Number) issued by the BIR. The tool reads the 9-digit core, separates any branch code (000 for the head office) and formats the number as NNN-NNN-NNN.

Because the BIR check-digit algorithm is not publicly documented, this is a length and structure validator only — it never claims the number is genuine and never checks it against any tax register. Everything runs in your browser, so the number you type is never uploaded.