The Onset Date is the date your are alleging that you became disabled. It is not necessarily the last day you worked, although often it is, but it is the date you became disabled, and the date you can prove you became disabled. Everything gets measured from that date, including retroactive benefits. For example, benefits become payable 5 months after your Onset Date.
How Do You Determine Your “Onset Date”? 2016-11-02T12:08:36+00:00