Many plan sponsors don’t think about a benefit plan audit until they realize one is required. By then, the timeline feels tighter, document requests feel heavier, and the first-year learning curve can be steeper than expected.
Bringing in an employee benefit plan (EBP) auditor early is a strategic decision that helps plan sponsors stay ahead of Form 5500 deadlines and prevent last-minute surprises.
Key takeaways:
- A plan generally reaches large-plan filing status when it has 100 or more participants with account balances at the beginning of the plan year, subject to transition-rule considerations.
- A strong planning window is 90 to 120 days before plan year-end, especially for first-time audits or plans with operational complexity.
- Bringing in a qualified EBP auditor early gives sponsors more time to gather documents, coordinate with service providers, and surface issues like late deposits or eligibility errors before they become audit findings.
When an Audit Becomes a Real Possibility
EBP audit requirements are generally triggered when a plan has more than 100 participants with account balances on the first day of the plan year. Plans meeting this threshold are treated as large plans and typically require an audit attached to Form 5500.
Plans hovering near the threshold should also be aware of the small-plan transition rule. In practical terms, a plan that filed as a small plan last year may not automatically need an audit the first year it crosses 100 participants with balances. The 120-participant threshold may determine when the audit requirement becomes unavoidable.
For first plan years, audit determinations may be based on end-of-year balances. Because participant counts include former employees and retirees with balances, plans often cross the threshold sooner than expected.
When to Bring in an EBP Auditor
Timing the conversation with a qualified employee benefit plan auditor is just as important as confirming whether an audit is required. Plan sponsors should consider reaching out when:
- The plan is approaching the 100-participant threshold.
- The plan has crossed the threshold and will need an audit for the next filing.
- It is the plan’s first audit, and internal teams need additional lead time.
- Plan operations are complex, or prior issues may increase audit effort.
As Bennie J. Lewis, CPA, President and Partner at Assurance Dimensions, says, “Most plan sponsors don’t struggle with understanding what an employee benefit plan audit is. They struggle with knowing when it applies to their plan. That uncertainty is what usually creates last-minute pressure.”
A strong planning window is 90 to 120 days before plan year-end, giving sponsors and auditors time to align on scope, timing, and deliverables.
Why Early Timing Matters
Early engagement gives plan sponsors more control over the audit process, such as:
- More time to gather plan documents and participant data.
- Better coordination with HR, payroll, third-party administrators, and recordkeepers.
- Earlier identification of late deposits, eligibility errors, or data mismatches.
- Reduced stress around Form 5500 timing and audit completion.
First-time audits especially benefit from early engagement because internal teams often underestimate the documentation and coordination required. Waiting until summer typically limits options and compresses timelines, even when extensions are available.
How Assurance Dimensions Helps Plan Sponsors Prepare
Plan sponsors who engage an EBP auditor early are better positioned to manage compliance, support service providers, and complete Form 5500 filings without unnecessary pressure.
At Assurance Dimensions, we bring specialized experience in employee benefit plan audits and ERISA-related requirements. Our process is built around clear communication and structured planning before fieldwork begins.
For growing plans and first-time audits, our team helps clients understand timing, organize audit requests, coordinate with service providers, and reduce preventable delays before fieldwork begins.
If your plan is approaching key thresholds or preparing for a first audit, contact Assurance Dimensions to discuss your plan’s timing, threshold status, and audit readiness.