
SECURE 2.0 Long-Term Part-Time 401(k) Rules: What to Fix Before December 31, 2026
Employees with 500+ hours in both 2024 and 2025 must be allowed to defer into a calendar-year 401(k) in 2026, and the written plan amendment is due December 31, 2026. Who qualifies, why vesting years are earned at 500 hours rather than 1,000, and a seven-step checklist for small employers.










