Form SSA-821-BK, Work Activity Report - also known as SSA Form 821-BK- is a form used for reporting an individual's working activity to the Social Security Administration (SSA). This form is necessary to determine the individual's eligibility for disability benefits.
This form requires information only about working activity after the alleged onset date (AOD). AOD is the day the individual claims to be unable to work because of a disability. The latest version of the form was issued by the SSA in January 2019. An SSA-821-BK fillable form is available for download and digital filing below.
The SSA mailed you the SSA Work Activity Report because you receive disability insurance benefits. The administration received information about your working activity after the AOD and it requires information about your work to make sure that you are still eligible for the benefits. The cover page of Form SSA-821-BK contains a reason for mailing the form to you.
If you have been doing any kind of work and earn any amount of money, you should file the report.