If you sponsor a 401(k) plan for your employees, there’s a chance you might one day hear the words “Your plan is due for an audit.” For some employers, this comes as a surprise—and not the pleasant kind. The truth is, 401(k) audits are a normal part of compliance for many businesses, and with the right preparation, they don’t have to be stressful.
At Full Focus Financial, we’ve guided countless businesses through the process, helping them understand exactly when an audit is required and how to get ahead of it. Let’s walk through the essentials, so you know what to expect and how to prepare.
When is a 401(k) Plan Audit Required?
The general rule is this: If your plan has 100 or more eligible participants at the start of the plan year, a 401(k) audit is required.
But here’s where it gets tricky—“eligible participants” doesn’t just mean people actively contributing. It also includes:
Employees eligible to participate, even if they haven’t enrolled.
Former employees with money still in the plan.
Beneficiaries of deceased participants.
So, it’s possible to hit that 100-participant threshold even if your payroll system doesn’t show 100 active contributors.
There are exceptions—like the 80-120 participant rule—which can sometimes delay the need for an audit. But in most cases, once you cross that 100-participant mark, it’s audit time. Knowing this ahead of time can help you plan and budget accordingly.
Why Audits Matter
A 401(k) plan audit isn’t just a box to check. It’s a way for the Department of Labor (DOL) to ensure that your plan is operating in compliance with ERISA regulations and protecting participants’ retirement savings. An audit reviews things like:
How employee contributions are handled.
Whether plan operations match the plan document.
Accuracy of participant statements.
Compliance with fiduciary responsibilities.
Failing an audit—or avoiding one when required—can lead to penalties, back payments, and unnecessary headaches.
Preparing for a 401(k) Audit: A Practical Pre-Checklist
The good news? With a little preparation, you can make the audit process much smoother. At Full Focus Financial, we recommend starting with this pre-audit checklist:
Review Your Participant Count
Determine whether you’ve crossed the 100-eligible-participant threshold early in the year, so you’re not blindsided.Keep Plan Documents Organized
Have your signed plan document, amendments, and summary plan descriptions ready and up to date.Reconcile Payroll and Plan Records
Make sure all contributions match between payroll records and plan statements.Test Compliance Before the Auditor Does
Conduct internal reviews for nondiscrimination testing, loan limits, and contribution timing.Gather Service Provider Reports
Have year-end statements, trust reports, and third-party administrator records in one place.Document Your Fiduciary Process
Keep minutes from plan committee meetings and decisions related to investment changes.
Staying Ahead with Automated Compliance
One of the biggest challenges for employers is keeping track of all the moving parts in a 401(k) plan. That’s why Full Focus Financial helps clients integrate automation tools to monitor contribution deposits, track participant eligibility, and flag compliance issues before they become audit findings.
Automation can:
Reduce manual errors.
Provide real-time reporting.
Keep you on track with filing deadlines.
Lower the risk of penalties.
By building compliance into your workflow, you can reduce stress when audit time rolls around.
The Bottom Line
A 401(k) audit doesn’t have to be a nightmare—it’s simply part of being a responsible plan sponsor. Understanding 401(k) audit requirements, staying organized, and preparing in advance can turn what feels like a burden into a manageable task.
If you’re unsure whether your plan is due for an audit, or you want to make the process easier, the team at Full Focus Financial is here to help. We’ll walk you through eligibility thresholds, ensure your records are ready, and even help automate compliance so you can focus on running your business.
Ready to prepare for your next 401(k) audit with confidence?
Contact Full Focus Financial today, and let’s make sure your plan passes with flying colors.