ein

Validates a US EIN (Employer Identification Number), also known as a Federal Tax ID.

Options

Option	Type	Default	Description
message	string	locale default	Custom error message

Playground

Valid values

Value	Notes
"12-3456789"	Standard EIN format with hyphen
"123456789"	EIN without hyphen

Invalid values

Value	Reason
"07-1234567"	Prefix 07 is not assigned
"00-0000000"	All-zero EIN is invalid

Notes

• Empty string ("") always returns valid: true. Combine with notEmpty to require a value.
• Format: two-digit prefix + hyphen + seven digits (XX-XXXXXXX).
• Certain prefix codes (00, 07, 08, 09, 17, 18, 19, 28, 29, 49, 69, 70, 78, 79, 89, 96, 97) are not assigned. Note: prefix 99 is valid and assigned.