Plan Audit

A Plan Audit, in the context of employer-sponsored 401(k) retirement plans, refers to the thorough examination and evaluation of the plan's financial records, operations, and compliance with applicable regulations. This essential process is conducted by an independent and qualified auditing firm to ensure the plan's integrity, accuracy, and adherence to the guidelines set forth by the Employee Retirement Income Security Act (ERISA) and the Internal Revenue Service (IRS).

During a Plan Audit, auditors review various aspects of the 401(k) plan, including contributions, investments, participant data, plan expenses, and administrative procedures. The primary objectives are to identify any potential errors or discrepancies, verify that plan assets are being managed prudently, and ascertain if the plan meets the necessary compliance standards.

Example 1: ABC Corporation's HR department decides to conduct a routine Plan Audit for their 401(k) plan. The auditing firm scrutinizes the plan's financial statements, participant records, and investment choices to ensure accurate accounting and adherence to ERISA regulations.

Example 2: XYZ Corp, a medium-sized business, faces a surprise Plan Audit initiated by the Department of Labor. The auditors investigate the plan's administration and discover some documentation irregularities, prompting the company to rectify the issues promptly to avoid potential penalties.

Example 3: A nonprofit organization sponsors a 401(k) plan for its employees. As part of their fiduciary duty, the organization arranges a comprehensive Plan Audit to guarantee the plan's proper management and compliance, ensuring the employees' retirement savings are protected.

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According to Mployer Insights’ 2026 analysis of 76,000+ employer benefit plans, disability insurance remains a major market differentiator, with only 41% of U.S. employers offering short-term disability (STD) and 38% offering long-term disability (LTD). While 60% salary replacement serves as the national standard across both benefit types, standard plan designs disproportionately expose higher earners due to median benefit caps of $1,602/week for STD and $8,273/month for LTD. Furthermore, alignment between STD benefit durations (median 26 weeks) and LTD elimination periods (68% at 90 days) remains a critical area for plan structure optimization.
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According to Mployer Insights’ 2026 analysis of 50,000+ employer health plans, prescription drugs account for over 25% of total benefit expenses, with Tier 4 specialty drugs driving the majority of high-cost claims. While Tier 4 copays average $123 with coinsurance requirements in 31% of plans, individual oncology therapies like Darzalex Faspro ($170,800/yr) and Keytruda ($158,200/yr) frequently exceed average individual stop-loss deductibles ($141,938). To mitigate exposure, self-funded employers are increasingly turning to independent, transparent PBM models and biosimilar substitution—which yields up to a 73% net cost reduction per patient.