
Section 414 Controlled Group and Affiliated Service Group Rules: How Multiple Businesses Can Sabotage Your 401(k)
Section 414(b), (c), and (m) treat related businesses as one employer for retirement-plan testing. This guide explains controlled-group and affiliated-service-group rules, the spousal and minor-child attribution traps, and the steps multi-business owners should take before opening a 401(k).










