When you file for Social Security disability, you will be asked to identify the date you contend that you became disabled. This date is known as your Alleged Onset Date (abbreviated by Social Security as your AOD).
Social Security does not offer much guidance as to what this date should be. I have had clients tell me that in telephone applications, the SSA phone operator will suggest a date. Other clients pick a date that corresponds to the date their illness was diagnosed or the date that they stopped working.
In general, your Alleged Onset Date should be the date when your medical or mental health condition created so many impediments to your ability to function at a job that you had to stop working.
I generally advise my clients to choose a date after they stop working. Remember that Social Security defines disability as the inability to engage in substantial gainful activity – if you are working and earning money, the presumption will be that you are engaged in substantial activity. In other words, you cannot be working and disabled at the same time.



