US ITIN Validator
Validate US Individual Taxpayer Identification Numbers (ITIN) in real time under IRS guidelines.
IRS ITIN Validation
Checks the 9-digit format, ensuring the number starts with '9' and contains an authorized middle 2-digit range.
Essential for US banking onboarding, W-8BEN form handling, and non-resident tax compliance software.
Anatomy & Structure of ITIN (9 Digits: 9XX-XX-XXXX)
The IRS Individual Taxpayer Identification Number is divided into 3 regulatory parts:
| Position | Field | Length | Meaning & Rule | Example |
|---|---|---|---|---|
| 1 to 3 | Area (Starts with 9) | 3 digits | Must start with digit 9 (900-999 series reserved exclusively for IRS processing) | 912 |
| 4 & 5 | Group Digits | 2 digits | Official IRS ranges: 50-65, 70-88, 90-92, 94-99 | 75 |
| 6 to 9 | Serial Number | 4 digits | Sequential identifier from 0001 to 9999 (0000 forbidden) | 1234 |
ITIN Validation Algorithm (IRS Rules)
ITIN verification checks the mandatory leading 9, authorized group ranges, and non-zero serials:
Starts with 9 && MiddleDigits in [50-65, 70-88, 90-92, 94-99] && Serial != 0000
- 1. Confirm the document comprises exactly 9 numeric digits.
- 2. Verify that the first digit is strictly 9.
- 3. Extract the 4th and 5th digits (Group Number).
- 4. Check that the group falls within allowed IRS ranges: 50-65, 70-88, 90-92, or 94-99.
- 5. Verify the final 4 digits are not 0000.