Social Security Number

What is Social Security Number?

A Social Security Number (SSN) is a nine-digit number assigned to U.S. citizens, permanent residents, and eligible temporary residents by the Social Security Administration. It was originally created to track individual earnings and determine Social Security benefit entitlements.

Why Social Security Number Matters

In the employment context, an SSN is essential for payroll processing, tax withholding, W-2 reporting, and verifying work eligibility through Form I-9. Employers collect SSNs during the hiring process and are legally required to report employee wages to the IRS using this identifier.

Because of the sensitive nature of SSNs, HR and payroll departments must implement strict data security measures to protect this information from unauthorised access or identity theft. Federal and state laws impose penalties on organisations that fail to safeguard personally identifiable information.