Taxation of Social Security benefits

An SSA-1099 is mailed to you in January showing the total amount of benefits you received in the previous year. If you are a nonresident alien who received or repaid Social Security benefits last year, you will receive an SSA-1042S instead.

You can receive a replacement SSA-1099 here : https://secure.ssa.gov/apps6z/i1099/main.html

Taxation depends on the types of benefits you receive. Here is information on taxation :
http://www.ssa.gov/planners/taxes.htm

People who receive Supplemental Security Income (SSI) do not receive Benefit Statements (SSA-1099), since SSI is based on need and is not considered taxable income.