If you are under full retirement age and are receiving a disability annuity, refer to Booklet RB-1D, Employee Disability Benefits, for an explanation of the effect of earnings on a disability benefit.
When disabled children work in any kind of employment, their earnings may affect payment of your Special Guaranty increase. The RRB will determine whether or not the work is Substantial Gainful Employment. This is explained in booklet RB-19A, Child's Disability Benefits. These earnings are to be included on the application AA-19A, Application for Determination of Child Disability.