Before you start your application, we recommend you get an estimate of your retirement benefit. This too, you can do on the Social Security website at www.socialsecurity.gov/estimator. The Retirement Estimator uses your personal employment history to estimate your retirement benefit. It also will help you to answer some of the questions on the retirement application.
Social Security offers an online retirement application that you can complete in as little as 15 minutes. It’s so easy. Better yet, you can apply from the comfort of your home or office at a time most convenient for you. There’s no need to drive to a local Social Security office or wait for an appointment with a Social Security representative.
In most cases, once your application is submitted electronically, you’re done. There are no forms to sign and usually no documentation is required. Social Security will process your application and contact you if any further information is needed.
Not ready to retire yet? It's never too early to start planning. Use the Retirement Estimator to obtain immediate and personalized estimates of your future retirement benefit.
http://www.socialsecurity.gov/estimator/