Under the terms of the 401(k) plan document, a related employer must complete a participating employer adoption page for employees of that related employer to participate in the 401(k) plan.
The 401(k) plan sponsor is an S Corp, and employees of a QSub of the plan sponsor also participated in the 401(k) plan but a participating employer adoption page was not completed for the QSub.
We know that a QSub is disregarded for federal tax purposes because its assets, liabilities, and items of income, deduction, and credit are treated as owned by the parent S corporation, so this may make sense.
Has anyone else seen a QSub participate without completing a participating employer adoption page?