A DC/401(k) plan is sponsored by Company X. Three years after plan effective date, Company Y becomes a bro-sis controlled group with X. All of Y's ee's are collectively bargained union hence statutorily excludable from the plan.
Plan document is standardized prototype and the adoption agreement box that could be checked to exclude collectively bargained ee's from plan participation is not checked.
TPA does not ask the questions "do you have union ee's" and "are you a controlled group." TPA is responsible for plan document maintenance. As a result of TPA not asking the questions, the prototype is not amended to exclude union folks. Union employees are not offered the plan.
Four more years pass and the plan sponsor discovers this error. If the only contributions to the plan were deferral and match, does the employer deposit a QNEC (based on ADP of NHCE's for the years in question) and corresponding match for the union folks? Is that the proper remedy? Thanks for any help.