Top 401(k) Compliance Mistakes Employers Should Avoid

Understanding and staying on top of 401(k) compliance is crucial for employers sponsoring retirement plans. With evolving regulations and rising penalties, missteps can lead to serious legal, financial, and reputational consequences. At Lifeguard Retirement, we specialize in ensuring employers remain fully compliant while reducing liability. In this article, we highlight the most common compliance mistakes plan sponsors make—and how to avoid them.

1. Missing or Late Form 5500 Filings

One of the most frequent compliance failures is missing the annual Form 5500 deadline. For 2025, the Department of Labor caps penalties at up to $2,670 per day for late filings Full Focus Financial+5blog.premployerinc.com+5ADP+5ERISA Advisory Group. Even a one-week delay could result in a six‑figure fine.
How to avoid it: Maintain a robust compliance calendar, use reliable reminders, and consider outsourcing the filing process. As a 3(16) fiduciary, Lifeguard Retirement manages all plan documentation, ensuring timely and accurate submissions.

2. Failing Nondiscrimination and ADP/ACP Testing

Employees benefiting disproportionately—especially highly compensated employees (HCEs)—can trigger failed nondiscrimination tests (ADP/ACP), leading to costly corrective distributions.
Best practice: Monitor participation and contribution levels throughout the year. Safe Harbor 401(k) designs, for instance, automatically meet testing requirements. Lifeguard Retirement supports proactive testing and strategic plan design to avoid shortfalls before they occur.

3. Delayed Employee Contribution Deposits

Employee deferrals must be deposited “as soon as reasonably possible”—within 7 business days for small employers, and sooner as plan size increases. Late deposits can be considered prohibited transactions and attract DOL excise taxes.
What to do: Automate payroll contributions, schedule internal audits, and regularly verify deposit timing. Our administration team at Lifeguard Retirement reviews deposit records regularly to keep client plans safe.

4. Outdated or Incomplete Plan Documents

Plan documents must accurately reflect the latest legal requirements. Updates to SECURE 2.0 and other 2025 changes include new auto‑enrollment provisions, part‑time eligibility rules, emergency withdrawal options, and Roth‑only catch‑ups for high earners Jackson Walker+2Spotsaas+2cradvisors.com+2.
How we help: Every year, Lifeguard Retirement reviews plan documents, amends provisions according to changes, and provides revised participant disclosures as required under ERISA.

5. Failure to Communicate Required Notices to Participants

ERISA mandates that employers provide timely and accurate notices (such as SPDs, SARs, blackout notices, and required coverage disclosures). Errors or omissions can trigger DOL enforcement.
Preventive action: Integrate a communication schedule with reminders, and use digital platforms for accessibility. Lifeguard Retirement ensures all required materials are delivered and logged according to timing rules.

6. Ignoring the VFCP (Voluntary Fiduciary Correction Program)

When minor plan errors (e.g., late deposits or eligible loan missteps) occur, the VFCP program allows employers to self-correct under DOL guidance. Recent 2025 updates simplify the process and reduce associated administrative burdens Employee Fiduciary.
Using VFCP: Document, correct, and submit according to DOL guidelines. Lifeguard Retirement provides full support for VFCP submissions when small mistakes inevitably occur.

7. Neglecting Regular Plan Audits and Reviews

Many employers overlook the importance of periodic internal audits of their 401(k) processes: loan administration, participant eligibility, plan vendor communication, and fiduciary decisions.
Mitigation strategy: Schedule annual reviews to catch inconsistencies or evolving regulatory issues. As part of our services, Lifeguard Retirement conducts regular audits and recommends improvements to maintain full compliance.

Conclusion

Avoiding these common mistakes safeguards your organization against penalties, plan disqualification, and legal exposure. By partnering with Lifeguard Retirement, you offload administrative burdens and fiduciary responsibilities to a trusted professional. We manage filings, nondiscrimination testing, employee deposits, document updates, notices, and correction procedures—giving you confidence that your plan remains compliant, optimized, and aligned with shifting laws into 2025.