Generally, if a plan disaggregates otherwise excludable employees to satisfy the coverage requirements of IRC §410(b) its my understating it must do the same for nondiscrimination testing. My question, if the plan does NOT disaggregate for coverage CAN it be disaggregated for nondiscrimination testing i.e., ADP/ACP.
In other words 410(b) would not be disag'd but ADP would be...?