If you're referring to the requirement that most new 401(k) plans be EACAs starting in 2025, as added by SECURE 2.0 sec. 101, there is no exception for large plans. As I read it, for any plan year in 2025 or later, if any 401(k) or 403(b) plan does not contain EACA provisions, it fails to be a qualified CODA, unless it meets one of the exceptions in 414A(c). The only exceptions are for SIMPLEs, plans established before 12/29/2022, governmental and church plans, plans sponsored by businesses less than 3 years old, and plans sponsored by businesses which normally employ no more than 10 employees.