20 C.F.R. § 220.29 Work that is considered substantial gainful activity.
Title 20 - Employees' Benefits
Work is considered to be substantial gainful activity if it— (a) Involves doing significant and productive physical or mental duties; and (b) Is done or is intended to be done for pay or profit. (See §220.141 for a detailed explanation of what is substantial gainful activity.)
Title 20: Employees' Benefits
PART 220—DETERMINING DISABILITY
Subpart D—Disability Under the Railroad Retirement Act for Any Regular Employment
§ 220.29 Work that is considered substantial gainful activity.
