EIN Validator - Validate US Employer Identification Numbers

Validate EIN numbers instantly and check format compliance with IRS rules

Enter EIN Number

Enter with or without formatting (dash). EIN is always 9 digits.

Enter an EIN number above to validate

EIN Format Reference

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

Format Structure

EINs follow the pattern XX-XXXXXXX, where the first two digits are the IRS campus prefix

XX-XXXXXXX

IRS Campus Prefix

The first two digits indicate which IRS campus issued the EIN. Not all values from 00-99 are valid.

EIN Validation Rules

Must be exactly 9 digits long
First two digits must match a valid IRS campus prefix
Cannot consist of all identical digits

About EIN Validator

EIN Validator verifies US Employer Identification Numbers (EINs) by checking format compliance with IRS structural rules. EINs are 9-digit numbers issued by the IRS to businesses, trusts, estates, and other entities for tax filing and reporting purposes.

Validate EIN numbers instantly with verification of the two-digit prefix against all IRS-assigned valid prefixes, plus structural checks for total length and digit rules. The tool provides detailed breakdown showing the prefix and suffix components and gives specific error messages for each validation rule that fails.

Essential for payroll processing systems, business registration forms, banking KYC applications, accounting software, and any platform that collects EIN data from US businesses. Useful for developers building forms that need client-side EIN validation before server submission.

Instant prefix and format validation catches common data entry errors before processing. Detailed error messages pinpoint exactly what is wrong with an invalid EIN. Structural breakdown provides clarity on the EIN format. All validation runs entirely in the browser for complete privacy.

Key Features

IRS prefix validation against all valid codes
Prefix and suffix structural breakdown
Specific error messages for each validation rule
Formatted and unformatted output display
Complete client-side privacy protection
Instant validation with no server requests

EIN Validator Frequently Asked Questions

How accurate is the EIN validation?

Our validator checks EIN format compliance and prefix validity against all known IRS-assigned two-digit prefixes. It verifies total length (9 digits), correct formatting (XX-XXXXXXX), and that the prefix is one the IRS has assigned. It does not verify if the EIN is actually registered with the IRS or currently active.

What is an EIN?

An EIN (Employer Identification Number), also called a Federal Tax Identification Number or FEIN, is a unique 9-digit number assigned by the IRS to businesses, trusts, estates, nonprofits, and other entities. It is used to identify the tax accounts of the business and is required for filing taxes and opening business bank accounts.

What does the two-digit prefix represent?

The first two digits of an EIN are the IRS Campus Code, indicating which IRS campus or service center issued the EIN. Not all two-digit combinations (00-99) are valid — only specific codes are assigned. An EIN with an unrecognized prefix has likely been entered incorrectly.

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

No. Our tool validates format and prefix structure only. It cannot confirm whether an EIN has been issued by the IRS or is currently assigned to a real business. For official verification, use the IRS Business Tax Account portal or consult an accountant.

Is my EIN data secure when using this validator?

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