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.

What lengths are accepted?

A valid TIN is 9 digits on its own, or 12 digits (9 + 3-digit branch), or 14 digits (9 + 5-digit branch). Any other length is flagged as invalid structure.

What does the branch code 000 mean?

A branch code of 000 (or all zeros) indicates the head office or main place of business. A non-zero branch code identifies a specific branch registered under the same taxpayer.

How should a TIN be formatted?

The core nine digits are conventionally written as NNN-NNN-NNN, and the branch code follows after another dash, e.g. 123-456-789-000. The tool reformats the digits you enter into this style.

Does this confirm my TIN is registered with the BIR?

No. It only checks the format and branch structure. Confirming that a TIN exists and belongs to a taxpayer requires a BIR record, which this offline tool never accesses.

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 Bureau of Internal Revenue. The tool reads the 9-digit core, separates any branch code (000 for the head office), and formats the number as NNN-NNN-NNN. It is handy for confirming a TIN was typed correctly before submitting BIR forms or invoices.

How it works

The validator strips non-digits and checks the total length, then splits the core from the branch:

9 digits   → core TIN only (no branch)
12 digits  → 9-digit core + 3-digit branch code
14 digits  → 9-digit core + 5-digit branch code
core formatted as NNN-NNN-NNN; branch 000 (or all zeros) = head office

Because the BIR’s check-digit algorithm is not public, this is a length and structure validator only — it never claims a number is genuine and never queries any tax register.

Example

Enter 123456789000:

Length 12 → core 123-456-789, branch 000
Branch 000 → head office
Structure: valid

Input	Core	Branch	Meaning
123456789	123-456-789	—	core only
123456789000	123-456-789	000	head office
123456789005	123-456-789	005	branch 005

Everything runs in your browser, so the number you type is never uploaded.