As the year comes to a close, business owners face critical deadlines for their 401(k) plans. Proper year-end planning ensures compliance, maximizes contributions, and keeps your employees’ retirement goals on track. From contribution limits to plan design adjustments, these are the items you cannot afford to overlook before December 31st.
1. Review 401(k) Contribution Limits
Each year, the IRS updates contribution limits for 401(k) plans. For 2025:
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Employee deferral limit: $23,000 (under 50), $30,500 (50+)
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Total contribution limit (employer + employee): $66,000 (under 50), $73,500 (50+)
Ensure that all employee deferrals and employer contributions are aligned with these limits. Making adjustments now can help participants maximize their retirement savings.
2. Verify Employer Contributions
If your plan includes matching or profit-sharing contributions, now is the time to confirm that all employer contributions are calculated and scheduled.
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Check contribution formulas and eligibility requirements
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Ensure that highly compensated employees (HCEs) are contributing enough to pass nondiscrimination testing
3. Perform Nondiscrimination Testing
401(k) plans must pass ADP, ACP, and top-heavy testing annually. These tests ensure that highly compensated employees don’t benefit disproportionately.
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Conduct preliminary testing now to identify shortfalls early
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Make corrective contributions if necessary to avoid penalties
4. Send Required Notices to Participants
Year-end is also a key time to confirm that your plan meets notice requirements:
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Safe Harbor notices
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Automatic enrollment notices
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Qualified Default Investment Alternative (QDIA) notices
Failing to send these notices on time can trigger compliance issues and potential penalties.
5. Review Plan Design Changes
Year-end is a great time to evaluate your 401(k) plan’s structure. Consider:
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Increasing matching contributions to incentivize employees
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Adding or modifying automatic enrollment or auto-escalation features
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Reviewing investment options and fees to ensure the plan is competitive and cost-efficient
Even small changes now can have a significant impact on participation and retirement outcomes.
6. Confirm Administrative Deadlines
Ensure that all administrative tasks are on track, including:
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Contribution deposits for the year
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Form 5500 preparation (if applicable)
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Participant statements and disclosures
Meeting these deadlines keeps your plan in good standing and avoids IRS or DOL issues.
7. Meet with Your 401(k) Advisor
Finally, scheduling a year-end review with your 401(k) advisor is essential. They can:
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Evaluate your plan’s compliance and performance
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Identify opportunities to increase contributions or improve plan design
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Ensure your company is prepared for 2025 changes
Working with a trusted advisor helps business owners avoid costly mistakes and optimize retirement benefits for their employees.
Conclusion
The end of the year is a critical time for 401(k) plan compliance, contributions, and design adjustments. By following this year-end checklist, business owners can ensure they are on track, protect their company from compliance issues, and help employees maximize their retirement savings.
Don’t wait until the last minute—start your year-end 401(k) review today to make the most of 2025 and set your plan up for success in 2026.