What is ssn

Last updated: April 1, 2026

Quick Answer: A Social Security Number (SSN) is a nine-digit identifier issued by the U.S. Social Security Administration to track individuals for employment, taxes, and benefits.

Key Facts

History of the Social Security Number

The Social Security Number was created in 1936 as part of the New Deal legislation establishing the Social Security program. Originally intended to track workers' earnings for Social Security benefits, the SSN has become the primary identifier for numerous government and financial services in the United States. What started as a temporary program identifier has evolved into a fundamental piece of personal identification.

How SSNs Are Structured

An SSN consists of nine digits divided into three parts:

In recent years, the Social Security Administration stopped assigning numbers geographically, now using randomization to prevent identity theft based on SSN patterns.

Uses of Social Security Numbers

SSNs are required for many purposes in American life, including:

Privacy and Security Concerns

Because SSNs serve as a universal identifier, they are valuable targets for identity theft. Protecting your SSN is critical to preventing fraud and unauthorized access to financial accounts. Many data breaches have exposed millions of SSNs, leading to increased awareness about SSN security. The government recommends limiting who you share your SSN with and monitoring your credit report regularly.

Legal Requirements

Organizations can legally request SSNs only for specific purposes like employment, credit reporting, and tax filing. You have the right to ask why an organization needs your SSN and how it will be protected. However, some organizations may deny services if you refuse to provide an SSN for legitimate business purposes.

Related Questions

Why do companies ask for your Social Security Number?

Companies request SSNs for employment verification, credit checks, tax reporting (W-2 forms), and background checks. Employers are required to verify your SSN for payroll and tax purposes. Financial institutions need it for credit reporting and fraud prevention.

What should I do if my Social Security Number is compromised?

If your SSN is compromised, contact the Social Security Administration's fraud hotline, place a fraud alert with credit bureaus, consider a credit freeze, and monitor your credit reports regularly for unauthorized activity. File an identity theft report with the FTC if fraudulent accounts appear.

Is it safe to share your Social Security Number?

You should only share your SSN with trusted organizations that have a legitimate need for it, such as employers, banks, and government agencies. Avoid providing it to unknown callers or over unsecured communications. Monitor your credit report regularly to detect unauthorized use.

Do I need an SSN to work in the United States?

Almost all employers require an SSN for employment, as it's necessary for tax withholding and wage reporting. Non-citizens may obtain an ITIN for tax purposes if they're not eligible for an SSN but have work authorization.

How is SSN used for identity verification?

SSNs are used to verify identity because they're linked to extensive records—employment, taxes, credit history, and benefits. Financial institutions and government agencies use SSNs to confirm you are who you claim to be before granting access to accounts or services.

Can you change your Social Security Number?

The Social Security Administration allows SSN changes only in specific circumstances, such as documented evidence of identity theft, harassment, or religious or cultural objections. Changed numbers don't erase previous records, and the change itself may affect credit history.

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Sources

  1. Social Security Administration Official Website Public Domain
  2. Wikipedia - Social Security Number CC-BY-SA-4.0