401(k) Plans Intended to Comply with the Traditional or Automatic Enrollment Safe Harbor Requirements: If you sponsor a 401(k) plan intended to meet safe harbor requirements in 2023, you have from October 3 until December 2 to notify your eligible employees of the safe harbor contributions for 2023. If this applies to your plan, the Program will provide you with a sample participant safe harbor notice. Please review the sample notices and instructions for additional information.