New 401k Rules 2025. Another change coming is that starting in 2025, all new 401 (k) plans — those established after dec. Here are ten of the most important changes in the secure act 2.0 and what you need to know.

For younger employees, secure 2.0 generally requires new 401(k) plans established after dec. Thanks to the secure act 2.0, starting in 2026, employees ages 50 or older.