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Employee benefit plan audits play a critical role in protecting plan assets, supporting accurate reporting, and helping fiduciaries meet obligations under federal benefits law. A well-managed audit can reveal operational weaknesses before they become costly compliance failures.
For employers sponsoring retirement or welfare benefit plans, audit requirements often depend on plan size, participant counts, and Form 5500 filing obligations. Careful preparation, qualified auditors, and timely corrective action help safeguard both participants and fiduciaries.
Why Employee Benefit Plan Audits Matter for Fiduciaries
Fiduciaries are responsible for administering employee benefit plans prudently, solely in participants’ interests, and in accordance with governing plan documents and applicable law. An audit provides an independent review of whether plan operations and financial reporting support those duties.
Employee benefit plan audits can identify weaknesses in internal controls, recordkeeping, and administrative practices before they develop into significant compliance failures. They also help confirm whether participant contributions, employer contributions, benefit payments, and plan assets are properly accounted for.
For plans subject to annual reporting requirements, a completed audit may be required as part of the Form 5500 filing. Inaccurate or incomplete reporting can expose the plan and responsible parties to regulatory scrutiny, penalties, and corrective obligations.
Audit findings give fiduciaries actionable information for improving oversight of payroll processes, service providers, investments, and participant transactions. This information supports informed decision-making and helps demonstrate a documented commitment to responsible plan governance.
Which Benefit Plans May Require an Audit
Many employee benefit plans that file Form 5500 may be subject to an independent audit requirement under ERISA and Department of Labor rules. The requirement generally depends on the plan’s participant count and whether an exception applies.
For plan years beginning on or after January 1, 2023, a large plan generally has 100 or more participants at the beginning of the plan year. Plans below that threshold may generally file as small plans, subject to applicable filing rules.
Retirement plans commonly requiring Employee benefit plan audits include 401(k), profit-sharing, defined benefit pension, and employee stock ownership plans. Welfare benefit plans, such as certain health and welfare trusts, may also require audits when they meet the relevant participant threshold.
Participant counts can include eligible employees, not only individuals with account balances or current contributions. Employers should review Form 5500 instructions and plan-specific facts carefully, particularly when participation fluctuates near the 100-participant threshold.
Participant-Count Thresholds for Form 5500 Filers
For plan years beginning on or after January 1, 2023, a retirement plan generally must obtain an independent audit when it has 100 or more participants at the beginning of the plan year. This threshold applies to Form 5500 filing requirements.
For this purpose, participants include eligible employees, whether or not they contribute or maintain an account balance, as well as retirees, beneficiaries receiving benefits, and certain former employees with vested benefits.
Plans with 80 to 120 participants at the beginning of a plan year may generally rely on the 80–120 participant rule. A plan that filed as a small plan in the prior year may continue doing so until it reaches 120 participants.
Accurate participant counts are therefore central to Employee benefit plan audits and Form 5500 compliance. Employers should verify counts using plan eligibility records and census data before determining whether an audit report must accompany the annual filing.
Plans Commonly Subject to Audit Requirements
Defined benefit pension plans and defined contribution retirement plans, including 401(k), profit-sharing, money purchase, and employee stock ownership plans, are commonly subject to audit requirements when they meet the applicable participant-count threshold for Form 5500 filing purposes.
Welfare benefit plans may also require an audit. Common examples include employer-sponsored health, dental, vision, life insurance, disability, and certain health reimbursement arrangements, particularly when benefits are funded through a trust or otherwise reported as a large plan.
Multiemployer plans and multiple-employer retirement or welfare arrangements can also fall within the audit rules. Their administration often involves contributions from several employers, making independent review especially relevant to plan assets, participant records, and financial reporting.
Employee benefit plan audits generally apply to plans covered by ERISA, though exceptions and special filing rules may apply to governmental plans, church plans, and certain unfunded or insured welfare arrangements.
Understanding the Legal Framework for Plan Audits
The legal framework for plan audits arises primarily under the Employee Retirement Income Security Act of 1974 (ERISA). ERISA establishes reporting, disclosure, fiduciary, and recordkeeping duties for many private-sector retirement and welfare benefit plans.
Department of Labor regulations generally require certain plans filing Form 5500 to attach an audit report prepared by an independent qualified public accountant. The requirement depends on applicable participant-count rules and plan characteristics.
The auditor’s work must follow generally accepted auditing standards and Department of Labor requirements for ERISA-covered plans. Audit reports support the accuracy of financial statements and information reported to plan participants and federal agencies.
Plan fiduciaries remain responsible for compliant administration, even when they engage outside professionals. Employee benefit plan audits do not transfer fiduciary duties; they can identify operational weaknesses, reporting errors, and documentation gaps requiring correction.
Selecting a Qualified Independent Public Accountant
Plan administrators should engage an independent qualified public accountant (IQPA) when an audit is required for the plan’s Form 5500 filing. The accountant must be licensed or certified under applicable state law and independent of the plan and its sponsor.
Experience with ERISA-covered retirement or welfare plans is a meaningful selection factor. An accountant familiar with Department of Labor reporting, plan assets, participant contributions, and benefit payments can better identify issues specific to employee benefit plan audits.
Independence should be evaluated before engagement. The auditor should not have financial interests, management responsibilities, or relationships that could impair objective judgment. Administrators should also confirm the firm’s professional licensing and peer-review status where applicable.
Before retaining the accountant, request a clear engagement letter describing the audit scope, responsibilities, fees, timetable, and information needed from the plan administrator. Asking about comparable plan audits and the proposed audit team helps assess whether the firm has appropriate experience and resources.
Preparing Records for Employee Benefit Plan Audits
Organized, complete records allow the independent auditor to evaluate whether a plan was administered according to its governing documents and applicable reporting requirements. Sponsors should identify a responsible contact, establish secure document access, and reconcile key records before fieldwork begins.
Provide the current plan document, adoption agreement, summary plan description, and all amendments effective during the audit period. Include board or committee minutes, service-provider agreements, fidelity bond information, and records supporting any plan mergers, terminations, or corrections.
Participant records should include eligibility dates, enrollment elections, beneficiary designations, compensation data, payroll registers, deferral elections, and loan or distribution documentation. Auditors commonly compare these records to test whether contributions, matching amounts, and benefits were calculated accurately.
For Employee benefit plan audits, sponsors should also assemble trust statements, investment reports, contribution remittances, Form 5500 filings, and reconciliations between payroll, plan records, and financial statements. Missing or inconsistent information should be identified early and explained with supporting documentation.
Plan Documents and Amendments
Auditors typically begin by reviewing the governing plan document, adoption agreement, summary plan description, and any related policies. These materials establish the plan’s eligibility rules, contribution formulas, vesting provisions, distribution terms, and fiduciary responsibilities.
Employers should provide every executed amendment, restatement, merger agreement, or termination document adopted during the audit period. Amendments must be dated, properly authorized, and retained with the original plan records to demonstrate that plan operations matched written terms.
Employee benefit plan audits often compare payroll, enrollment, and distribution activity against document provisions. Missing or outdated documents can prevent auditors from determining whether contributions, participant eligibility, and benefit payments were administered correctly.
Plan sponsors should also retain evidence that participants received required summaries or notices when applicable. Where a document has not been located or its effective date is uncertain, the sponsor should disclose the issue promptly and work with legal counsel to reconstruct the record.
Participant Data and Payroll Records
Auditors use participant and payroll records to test whether plan contributions, eligibility determinations, compensation calculations, and benefit elections were administered according to plan terms. Records should be complete, consistent, and readily traceable to supporting documents.
Employers should organize data for the audit period, including:
- Employee census files showing hire dates, termination dates, status, and hours worked
- Payroll registers identifying eligible compensation, deferrals, and employer contributions
- Enrollment elections, beneficiary designations, and changes in employment status
- Reconciliation reports linking payroll deductions to plan deposits and participant accounts
For retirement plans, auditors commonly compare employee deferrals and employer matching contributions with payroll records and trust activity. For welfare plans, they may test enrollment information, participant eligibility, and payroll deductions for required premiums.
Accurate records also help identify discrepancies, such as missed deferrals, incorrect contribution amounts, or employees included before satisfying eligibility requirements. Maintaining clear payroll-to-plan reconciliations supports timely Employee benefit plan audits and assists fiduciaries in demonstrating prudent plan administration.
Trust, Investment, and Contribution Records
Maintain complete records of all plan assets held in trust, including bank statements, custodial reports, investment account statements, transaction confirmations, and reconciliations. These documents allow the auditor to verify asset existence, valuation, and reported investment activity.
For participant-directed retirement plans, retain records showing participant balances, fund elections, transfers, loans, and distributions. Investment records should also identify fees, income, realized gains or losses, and any assets valued through methods other than quoted market prices.
Contribution records should reconcile payroll deductions and employer contributions to amounts deposited into the plan trust. Supporting materials may include payroll registers, contribution remittance reports, bank transfer confirmations, and records of matching or profit-sharing calculations.
During employee benefit plan audits, auditors commonly test whether employee deferrals were remitted promptly and whether employer contributions followed the plan document. Unexplained differences, missing deposits, or delayed remittances should be investigated and documented before audit fieldwork begins.
Key Audit Procedures for Retirement and Welfare Plans
Auditors examine whether retirement plans operate according to their written terms and applicable reporting requirements. Procedures commonly test participant eligibility, enrollment, employer matching contributions, vesting calculations, loan administration, hardship withdrawals, and benefit distributions.
For defined contribution plans, testing often compares payroll records with participant deferrals and verifies that employee contributions were remitted to the plan trust as soon as reasonably possible. Auditors also reconcile investment balances, participant accounts, and financial statements.
Welfare-plan procedures may review eligibility for health, life, disability, or other insured benefits; employer and employee premium payments; claims-related records where relevant; and the accuracy of benefit obligations reported on Form 5500. The scope depends on plan design and funding arrangements.
Employee benefit plan audits also evaluate internal controls over payroll, recordkeeping, and plan administration. Auditors may request supporting documentation, trace selected transactions, and identify whether corrections or additional disclosures are needed.
Common Compliance Issues Identified During Audits
Employee benefit plan audits frequently identify failures in the timely deposit of employee 401(k) deferrals and loan repayments. These amounts generally must be forwarded to the plan as soon as they can reasonably be segregated from the employer’s general assets.
Eligibility and enrollment errors are also common. Employees may be excluded after satisfying plan-entry requirements, enrolled too late, or assigned incorrect contribution rates. Auditors compare payroll, personnel, and plan records to determine whether plan terms were administered consistently.
Audits may reveal operational errors involving employer matching contributions, vesting, hardship withdrawals, participant loans, or required minimum distributions. Even minor deviations from written plan provisions can create compliance concerns and require correction.
Recordkeeping weaknesses often accompany these issues, including incomplete documentation of elections, missing payroll reconciliations, or unsupported benefit payments. Employee benefit plan audits help fiduciaries identify discrepancies before they lead to inaccurate Form 5500 reporting or broader regulatory exposure.
Late Employee Contribution Deposits
Employee elective deferrals and participant loan repayments must be deposited into the plan as soon as they can reasonably be segregated from the employer’s general assets. Delays can create prohibited transaction concerns under ERISA and the Internal Revenue Code.
Employee benefit plan audits commonly test payroll dates against deposit dates to identify late remittances. For plans with fewer than 100 participants, deposits made within seven business days of withholding generally qualify for a regulatory safe harbor.
Auditors may examine:
- Payroll registers, withholding reports, and bank transfer confirmations
- The timeliness and amount of employee deferral deposits
- Participant loan repayment remittances
- Lost earnings attributable to delayed deposits
When late deposits occur, the employer may need to restore lost earnings to affected participants and report the matter on Form 5500. In some cases, correction through the Department of Labor’s Voluntary Fiduciary Correction Program may be appropriate.
Eligibility and Enrollment Errors
Eligibility and enrollment errors arise when employees are admitted to a plan too early or too late, excluded despite meeting plan conditions, or enrolled under incorrect contribution or coverage elections. These mistakes can affect retirement and welfare benefit plans.
During employee benefit plan audits, reviewers often compare plan eligibility provisions with payroll, hire-date, hours-of-service, and enrollment records. Common discrepancies include:
- Missed entry dates for eligible employees
- Improper exclusion of part-time or rehired employees
- Enrollment elections not processed accurately
- Coverage beginning or ending on incorrect dates
Errors may result from outdated administrative procedures, incomplete data transfers, or inconsistent coordination among human resources, payroll, and benefit vendors. Auditors may also identify instances where employer matching contributions or benefit coverage were calculated incorrectly because enrollment data was inaccurate.
When an error is discovered, plan fiduciaries should determine the affected participants, quantify any missed contributions or coverage, and document corrective action. Depending on the plan and circumstances, correction may involve restoring missed benefits, making corrective contributions, or revising administrative controls to prevent recurrence.
Incorrect Plan Operations or Distributions
Incorrect plan operations occur when a benefit plan is administered inconsistently with its written terms or applicable legal requirements. Examples include using the wrong compensation definition for contributions, failing to apply vesting schedules, or disregarding plan loan provisions.
Distribution errors may involve payments made before a participant satisfies the plan’s distribution conditions, incorrect required minimum distributions, or hardship withdrawals lacking required documentation. Retirement plans may also improperly process beneficiary payments or rollover distributions.
During employee benefit plan audits, auditors compare administrative practices, payroll data, participant files, and distribution records against the governing plan documents. Discrepancies can expose fiduciaries to correction obligations, participant claims, and potential regulatory consequences.
Plan sponsors should investigate identified errors promptly, determine affected participants and amounts, and document corrective actions. Depending on the issue, correction may require restoring missed contributions or earnings, recovering overpayments where appropriate, or using available IRS or Department of Labor correction programs.
Responding to Audit Findings and Correcting Deficiencies
Audit findings should be reviewed promptly by plan fiduciaries, counsel, and the plan’s service providers. Determine the nature of each issue, the affected participants and periods, and whether the finding requires a correction, disclosure, or amended filing.
A practical response should include:
- Documenting the audit finding and its underlying cause
- Calculating any missed contributions, earnings, taxes, or participant adjustments
- Assigning responsibility and a deadline for each corrective action
- Retaining evidence that the correction was completed
For operational failures, correction may involve restoring participant accounts, revising payroll procedures, correcting eligibility records, or addressing improper distributions. Late employee contributions may require restoration of lost earnings and reporting through the appropriate Form 5500 schedules where applicable.
Employee benefit plan audits also help fiduciaries identify whether voluntary correction programs may be available. Legal counsel or qualified benefits professionals can help evaluate applicable Department of Labor or IRS correction procedures, particularly when a failure may affect plan qualification or fiduciary obligations.
Building an Ongoing Compliance Process After the Audit
Use audit findings to create a documented corrective-action plan with assigned owners, deadlines, and evidence of completion. Track each issue through resolution, including any required corrections to participant accounts, filings, or plan operations.
Establish written procedures for recurring tasks, such as timely remittance of employee contributions, eligibility reviews, loan administration, distributions, and Form 5500 preparation. Procedures should reflect current plan documents, service-provider responsibilities, and applicable legal requirements.
Schedule periodic internal reviews during the year rather than waiting for the next audit cycle. Reconcile payroll, participant census data, trust activity, and employer contributions, and investigate discrepancies promptly. Retain records supporting reviews and corrective actions.
Employee benefit plan audits can also inform fiduciary training and vendor oversight. Plan sponsors should review service-provider reports, confirm that controls remain effective, and update procedures when plan terms, payroll systems, or governing rules change.