"The transition from disability to retirement is a scary one for Social Security recipients. ...The biggest concern that those receiving Social Security disability have about reaching full retirement age is that their benefit amounts might go down. The reason has to do with the way that disability and retirement benefits are calculated. Specifically, in determining how much you receive in disability benefits, Social Security takes a look at your average lifetime earnings during the period before your disability began. ...A special rule for early retirees Interestingly, there's a special rule that applies for those who become disabled and then apply for early retirement benefits under Social Security. If you became disabled, started collecting early retirement, and then had your disability application approved by the SSA, then you'll continue receiving your Social Security retirement payments, but you'll also get disability benefits that are enough to bring you to the full amount of the monthly payment you're entitled to receive. Moreover, when you reach full retirement age, you'll receive full retirement benefits as if you had never filed for early retirement benefits."
Reference: www.fool.com
