A Social Security number (SSN) is a unique nine-digit number issued by the U.S. Social Security Administration (SSA). It is used to track individuals’ earnings and contributions to the Social Security system, and it is also used for tax purposes. Every working citizen and permanent resident in the United States needs to apply for an SSN to start working legally.
Applying for an SSN is a relatively simple process that can be completed online, by mail, or in person at a local Social Security office. To apply, you will need to provide proof of your identity and citizenship or legal residency status. You will also need to provide your birth certificate, W-2 forms, and proof of your income.