401(k) Audit Costs: Averages and What Impacts Price

A 401(k) plan audit is a required annual independent review for many plans once they reach certain participant counts. For plan sponsors, the question quickly becomes practical: what will the 401(k) audit cost, and what’s a reasonable “average” today? Below is a clear, sponsor-friendly breakdown of typical pricing, what drives fees up or down, and how to shop for the right auditor without creating extra risk.

What is the average cost of a 401(k) audit?

In today’s market, many plan sponsors report typical 401(k) audit fees clustering around the mid five-figures for straightforward plans, with more complex plans often higher. As a general budgeting rule of thumb, $15,000 is a common “average” estimate used by many sponsors and practitioners for a standard, first-time or early-year audit—though actual fees can land meaningfully below or above that depending on complexity.

Government agencies don’t publish an “average audit fee,” because audit pricing is set by the independent CPA firm and depends on plan facts. The best way to validate your budget is to request quotes from qualified firms and compare scope and assumptions.

If you’re still confirming whether you need an audit, start here: What Is a 401(k) Audit and When Do I Need One?. And because the audit ties directly to annual reporting, it’s also worth reviewing What is a Form 5500?.

Typical 401(k) audit cost ranges (what sponsors actually see)

While every plan is different, these ranges are commonly used for budgeting:

• Smaller / simpler plans: often ~$8,000–$12,000

• Mid-size “standard” plans: often ~$12,000–$20,000

• Complex plans: often ~$20,000–$35,000+

Complexity typically comes from plan design, payroll and eligibility issues, number of locations/pay groups, M&A activity, and whether the plan is a first-year audit (which can involve additional setup and learning curve).

What drives 401(k) audit pricing up (and how to control it)

Audit fees usually track the auditor’s time and risk. The more time it takes to request, validate, and reconcile data—or the higher the perceived compliance risk—the higher the price tends to be.

Common cost drivers include:

• Participant count and transaction volume: more participants typically means more testing.

• Data quality and responsiveness: disorganized files and slow turnaround can increase hours.

• Plan complexity: multiple payroll feeds, many locations, acquisitions, or unusual plan features.

• First-year audits: auditors often need more time to understand plan operations and controls.

• Problems discovered during the audit: late deposits, eligibility errors, or missing documentation can add work.

Ways to help keep your audit cost under control:

1. Use an audit-ready request list early and assign a single internal owner to coordinate responses.

2. Clean up payroll and eligibility data before the auditor starts fieldwork.

3. Confirm your service provider reports (trust/custody statements, participant census, loan reports) are complete.

4. Ask for a fixed-fee proposal that clearly states assumptions and what triggers change orders.

For a practical checklist of what you’ll be asked for, see What Is Needed for a 401(k) Audit and Where Do I Find It?.

How your audit connects to Form 5500 deadlines (and penalties)

Most plans that require an audit will need the audit report attached to the plan’s Form 5500 filing. This is one reason audit timing matters: delays can create filing issues and potential penalties.

To understand the stakes, read The High Cost of Non-Compliance: Penalties for Late or Rejected Form 5500 Audits. For regulatory background, the Department of Labor (DOL) explains the annual reporting requirements and enforcement framework on its site, including Form 5500 resources: EBSA FAQs on filing Form 5500. You can also reference the IRS overview of retirement plan reporting and compliance at IRS Retirement Plans resources.

Examples from our site: auditors with listed prices

Important note: I can’t access your live directory data or “see” which auditor listings (and their pricing) are currently on your site from this chat. If you share the list (or export) of auditors and their prices—or provide the URLs—I can format this section precisely and link each firm to its listing detail page.

That said, here’s the structure we recommend for this section, and an example using the auditor you mentioned:

• Browse all 401(k) auditors (directory category)

• PriceKubeka: listed price around $11,000

If you want to expand beyond 401(k) plans, we also maintain directories for related audit needs: 403(b) auditors, defined benefit plan auditors, ESOP auditors, and health & welfare auditors, plus all auditors.

How to choose an auditor without overpaying (or increasing risk)

Cost matters, but the cheapest audit can become expensive if it leads to delays, rework, or a filing problem. When comparing proposals, ask these sponsor-friendly questions:

• Is the fee fixed? If not, what assumptions could increase it?

• Who will actually do the work? Partner/manager involvement and staff experience matter.

• What is the timeline? Confirm fieldwork dates and draft report delivery.

• What do you need from us and by when? A clear request list reduces surprises.

• Do you specialize in employee benefit plan audits? Benefit plan audits are a niche.

Many sponsors also involve a retirement plan advisor to help coordinate vendors and reduce operational errors that create audit headaches. If that’s on your roadmap, see How To Hire A Retirement Plan Advisor and our directory of 401(k) financial advisors.

Related compliance costs sponsors should budget for

While you’re budgeting for the audit, don’t forget other compliance items that often show up around the same time:

• ERISA bond: Many plans must carry a fidelity bond to protect the plan. Learn more in What Is An ERISA Bond And How To Buy One? and compare options via ERISA bond providers.

• Legal support (as needed): If the audit uncovers operational issues, counsel can help evaluate corrections. See our directory of ERISA attorneys.

• Recordkeeper/TPA coordination: Your retirement plan providers may charge fees for special reports or compliance support depending on your agreement.

Conclusion: budget smart, then manage the process

A realistic budgeting target for many sponsors is that 401(k) audit costs often land around $15,000, with lower fees for simpler plans and higher fees when complexity or cleanup work is involved. The best way to protect both your budget and your filing timeline is to (1) get multiple quotes, (2) confirm scope and assumptions, and (3) prepare your documentation early.

If you’d like, share your auditor list (names, prices, and listing URLs), and I’ll update the “Examples from our site” section into a clean, fully linked table that highlights each firm’s listed price and detail page.