what is the meaning of ssn and tin
Taxpayer Identification Number. A Taxpayer Identification Number (TIN) is an identifying number used for tax purposes in the United States. It is also known as a Tax Identification Number or Federal Taxpayer Identification Number. A TIN may be assigned by the Social Security Administration or by the Internal Revenue Service (IRS).
Social Security Numbers. The SSN is the most common form of tax identification numbers. A child must have a SSN before a parent can claim that child as a dependent for income tax purposes, so most parents voluntarily apply for the number on behalf of their children.