What Is a Social Security Number (SSN)?

A Social Security Number is a unique, 9-digit number issued by the Social Security Administration (SSA) to U.S. citizens, permanent residents, and certain temporary residents. It’s used primarily for:

Tracking earnings and benefits
Tax reporting
Identity verification
Accessing government services

Format of a SSN

A typical SSN looks like this: 123-45-6789

It is structured as:

Area Number (first 3 digits)
Group Number (middle 2 digits)
Serial Number (last 4 digits)

Note: Since 2011, the SSA uses a process called “randomization,” which makes SSNs less predictable and more secure.

How to Get a SSN

For U.S. Citizens:

Typically assigned at birth
Parents can request one when applying for a birth certificate

For Non-Citizens:

Must have legal immigration status and authorization to work in the U.S.
Apply via Form SS-5 with supporting documents (e.g., passport, visa, work authorization)

Application Process:

Fill out Form SS-5
Provide original documents proving age, identity, and lawful status
Apply in person at a local Social Security office

Where Is Your SSN Used?

Employment paperwork (W-2s, I-9 verification)
Tax filing (with IRS)
Opening bank accounts or applying for credit
Receiving social benefits (e.g., Medicare, Social Security retirement)
Applying for a driver’s license or passport (in some states)

Protecting Your SSN

Due to identity theft risks:

Don’t carry your SSN card unless needed
Shred documents with your SSN before discarding
Never share it by email or phone unless you know the recipient is legitimate
Use strong passwords on financial and government websites