I am 64 years of age and am a federal csrsoffset employee with 23 years of service . I contacted social security and have gotten three different estimates regarding my benefits when I apply for them at the end of 2017. I am trying to get my monthly earnings from both sources as to know what my budget would be. Social security estimates received are $811.00 and $ 1109.00 And one for $1229.00 and a printout saying 87% of earnings , I font know which estimate to believe . thanks for any or a correct input.