Social Security is funded by a wage tax. The employee pays 6.2% of all wages up to $102,000 (this is the 2008 maximim, it increases every year). The employer pays an equal amount for a total contribution of 12.4%
Social Security and Medicare are funded by FICA
Medicare is not paid out of Social Security. The two are funded by different payroll taxes.
SSI is administered by Social Security and is funded by general revenues - taxes, etc.
For most as they pay into it over the life of their career with few exceptions.
Though social security is federal, Medicaid is state funded. You may want to call Medicaid and ask if you will be covered while traveling out of state.
Social Security
Social security
Payroll taxes on people who are still working
Social Security
Social Security provides cash payments, and Medicare provides health care, to citizens age 65 and older or permanently and totally disabled. Both programs are funded by payroll taxes.
The problem that many people see is that as the Baby Boom generation retires, social security costs are going to become so high that the system may not be adequately funded by the payments made by the existing work force.
The Social Security Act of 1935 established the Social Security programs including old age insurance, unemployment insurance (which is paid for by employers and is not, strictly speaking, a government fund) and federally-funded public assistance programs including Aid to Dependent Children.