United States · Validation
ITIN format validator.
Check whether a US Individual Taxpayer Identification Number has the right shape: 9 digits, starting with 9, with the 4th and 5th digits in an IRS-listed range.
What a pass means: an ITIN is written 9NN-NN-NNNN. It must start with 9, and digits 4-5 must fall in 50-65, 70-88, 90-92 or 94-99. A pass means the format is plausible — it does not prove the ITIN was issued, is active, or belongs to anyone. There is no public check digit for ITINs.
Inputs
Result
Enter an ITIN and press Check.
ITIN number format
An Individual Taxpayer Identification Number (ITIN) is a tax processing number the IRS issues to people who must file or be named on a US tax return but are not eligible for a Social Security Number. Per IRS Publication 1915, it is a nine-digit number beginning with 9, formatted like an SSN (9NN-NN-NNNN), whose fourth and fifth digits fall in 50–65, 70–88, 90–92 or 94–99.
This tool checks exactly those three things: 9 digits, first digit 9, and the fourth-and-fifth digits in one of the four ranges. It ignores dashes and spaces.
Worked example: 900-70-1234 starts with 9 and has middle digits 70, so it matches. 900-93-1234 has middle digits 93, which is in no listed range, so it fails. 123-45-6789 fails because it does not start with 9.
Sources: IRS, Publication 1915, Understanding Your IRS Individual Taxpayer Identification Number (states the ranges; read 30 September 2026). Background: IRS Individual Taxpayer Identification Number page and the Form W-7 instructions (Rev. December 2024); neither of those two restates the digit ranges, so Publication 1915 is the cited source. Some open-source libraries omit the 50–65 range; the IRS publication includes it.
Format match — not proof the ITIN was issued
A pass only means the number has the ITIN pattern. It does not query any IRS database and cannot tell you whether the ITIN was issued, is active or has expired, or belongs to a particular person. Confirm an ITIN with the IRS letter (CP565) or the person's Form W-7 / tax documents. Nothing you type is transmitted, stored, or logged.