A US Tax Identification Number (TIN) can be a Social Security Number (SSN), Employer Identification Number (EIN), or Individual Taxpayer Identification Number (ITIN). SSNs are for individuals, EINs for businesses.

How do I validate a US SSN format?

A valid SSN follows the format XXX-XX-XXXX where X is a digit. The first three digits cannot be 000, 666, or 900-999. Our validator checks both format and these rules.

What's the difference between SSN and EIN?

SSN (Social Security Number) is issued to individuals for tax and social security purposes. EIN (Employer Identification Number) is issued to businesses, trusts, and other entities.

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United States TIN validator

Check whether a United States SSN / EIN / ITIN follows the expected structure before you save it, send it to an API, or include it in a tax workflow.

Private by design

Your data stays in your browser

None of the TIN data you enter is ever saved to our servers — validation runs entirely on your device.

Validation Workspace

Validate SSN / EIN / ITIN

Enterprise checks for United States tax identification numbers.

Instant one-by-one format validation

SSN — 9 digits (XXX-XX-XXXX)

United States

Country

United States

Type

Private · SSN / EIN / ITIN

Tax identification numberAwaiting input

SSN — 9 digits (XXX-XX-XXXX)

Try a sample private SSN / EIN / ITIN to verify format compliance.

How United States tax IDs are formatted

In United States, the tax identifier is commonly known as Social Security Number / Employer Identification Number (SSN / EIN / ITIN). The expected format is SSN: 9 digits (XXX-XX-XXXX), EIN: 9 digits (XX-XXXXXXX). Teams usually need a United States SSN / EIN / ITIN check around tax filing, employment verification, banking, or before a record moves into billing, onboarding, or compliance review.

Valid examples

123-45-6789
12-3456789

Invalid examples

000-00-0000 (Invalid SSN)
12-345678 (Too short)

What this validator checks

Format and length

Confirms the number follows the expected United States pattern: SSN: 9 digits (XXX-XX-XXXX), EIN: 9 digits (XX-XXXXXXX).

Useful examples

Shows valid and invalid-looking samples so you can compare spacing, separators, letters, and digit counts before submitting real data.

When people usually check this number

Tax filing
Employment verification
Banking
Credit applications

A format match does not prove that a United States tax ID belongs to a specific person or business. Use the result as a first-pass data quality check, then confirm sensitive cases with official records.

Official source: IRS

Last reviewed: May 23, 2026. We update country guidance when public format rules change.

How to check a United States SSN / EIN / ITIN

Use this check before a record reaches billing, tax reporting, or manual review.

Enter the SSN / EIN / ITIN

Paste or type the United States tax identifier exactly as it appears in your source record. Spaces and separators are fine when they are part of the expected format.

Review the format result

Check whether the number matches the known United States structure, including length, separators, letters, and checksum rules where public guidance includes them.

Confirm important records

For onboarding, tax reporting, or compliance work, treat the result as a data-quality signal and confirm high-risk records with IRS or your internal process.

Frequently asked questions

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