ITIN Validator - Validate US Individual Taxpayer Identification Numbers

Validate ITIN numbers instantly and check format compliance with IRS rules

Enter ITIN Number

Enter with or without formatting (dashes). ITIN always starts with 9.

Enter an ITIN number above to validate

ITIN Format Reference

Individual Taxpayer Identification Numbers follow a specific 9-digit format defined by the IRS.

Format Structure

ITINs follow the pattern 9XX-XX-XXXX, where the first digit is always 9

9XX-XX-XXXX

Valid Prefix Ranges

The second digit must be 7, 8, or 9 (post-2013 assignment)

970-XX-XXXX980-XX-XXXX990-XX-XXXX

ITIN Validation Rules

Must be exactly 9 digits long
First digit must always be 9
Second digit must be 7, 8, or 9
Middle group (4th and 5th digits) cannot be 00
Last four digits (serial number) cannot be 0000

About ITIN Validator

ITIN Validator verifies US Individual Taxpayer Identification Numbers (ITINs) by checking format compliance with IRS structural rules. ITINs are 9-digit numbers issued by the IRS to individuals who are required to have a US taxpayer identification number but are not eligible for a Social Security Number.

Validate ITIN numbers instantly with verification of the 9XX prefix, second-digit range (7, 8, or 9), middle group, and serial number. The tool provides detailed structural breakdown showing each component of the ITIN and gives specific error messages for each validation rule that fails.

Essential for tax preparation software, immigration law firms, financial institutions, payroll systems, and any application that processes ITIN numbers. Useful for developers building forms that collect ITIN data and need client-side validation before submission.

Instant format validation catches common data entry errors before processing. Detailed error messages help users understand exactly what's wrong with an invalid ITIN. Structural breakdown provides transparency into the ITIN format. All validation runs entirely in the browser for complete privacy.

Key Features

IRS structural format validation
Prefix, middle group, and serial number verification
Specific error messages for each validation rule
Formatted and unformatted output display
Structural breakdown of ITIN components
Complete client-side privacy protection

ITIN Validator Frequently Asked Questions

How accurate is the ITIN validation?

Our validator checks ITIN format and structural compliance with IRS rules including the 9XX prefix requirement, valid second-digit ranges (7, 8, or 9 for modern ITINs), middle group constraints, and serial number rules. It does not verify if an ITIN is actually issued or active with the IRS.

What is the difference between an ITIN and an SSN?

An ITIN (Individual Taxpayer Identification Number) is a 9-digit tax processing number issued by the IRS to individuals who need a US taxpayer ID but are not eligible for a Social Security Number (SSN). ITINs always begin with 9 and have 7, 8, or 9 as the second digit, while SSNs have different prefix ranges.

Why does the second digit have to be 7, 8, or 9?

Since 2013, the IRS assigns ITINs with second digits of 7, 8, or 9 to clearly distinguish them from Social Security Numbers. This range was established as part of revised ITIN assignment procedures to avoid overlap with SSN ranges.

Can I use this to verify if an ITIN is real?

No. Our tool validates format and structure only. It cannot confirm whether an ITIN has been issued by the IRS or is currently active. For official verification, contact the IRS directly. This tool is intended for format validation in forms and applications.

Is my ITIN data secure when using this validator?

Absolutely. All validation happens entirely in your browser using JavaScript. No ITIN data is ever sent to our servers or any external service. Your data never leaves your computer, ensuring complete privacy and security.