What percent is used to determine my social security wages from my annual income

The social security wage base limit for 2012 is $110,100.

See Social Security Wage Base - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Social_Security_Wage_Base)

The Social Security Wage Base was $106,800 for 2011. Basically, if you earn more than this, you will still only pay Social Security tax on the first $106,800 of your income, so the "Social Security wages" (the part of your income you have to pay Social Security tax on) is capped at this number. If you earn less than this limit, than your Social Security wages should be the same as your wages.

If you earn less than this limit, than your Social Security wages should be the same as your wages.

One minor correction - if you earn less than the SS limit then your SS wages should be the same as your federal wages. Your federal wages are often less than your actual wages, due to deductions for pre-tax items like 401(k) plan and contributions to your employer's medical plan. On the other hand, if your employer provides more than $50K in life insurance the assumed cost of the excess is added to your federal (and SS) wages. So it's quite common for federal, SS, and actual wages to all be different numbers.