401(k) Contributions and Workers’ Comp: What Gets Included in the Audit

If you’ve ever sat across from an auditor and felt like you were on trial, you know the weight of a workers’ compensation audit. It’s a moment of truth—a chance for your business to prove it’s in compliance and not leaving money on the table, or worse, overpaying. But what many business owners don’t realize is how deeply intertwined something like 401(k) contributions can be with their workers’ comp costs. It’s a complex puzzle, and getting it right can make all the difference.

Why 401(k) Contributions Matter in Workers’ Comp Audits

Workers’ compensation premiums are calculated based on your payroll. But not just any payroll—specifically, the payroll that’s “exposed” to risk. This includes wages paid to employees who are covered under the policy and who could, in theory, file a claim if injured on the job. That’s where 401(k) contributions come into play.

Here’s a common scenario: a business offers a 401(k) plan and contributes to it on behalf of its employees. Some might assume that these contributions are separate from payroll for workers’ comp purposes. But in reality, the IRS and the workers’ comp insurers look at it differently. In most cases, employer 401(k) contributions are considered part of the employee’s compensation and, therefore, must be included in the total payroll used to calculate the workers’ comp premium.

A client I once worked with—a midsize manufacturing company—had been excluding 401(k) contributions from their audit for years. They believed those were just “benefits,” not part of the actual salary. When the auditor came in, they caught the omission. The correction wasn’t just a slap on the wrist—it added thousands to their premium in a single year. And that’s just one example.

What Else Gets Counted? A Quick Checklist

Workers’ comp audits can be confusing because there are so many moving parts. Here’s a quick refresher of the types of compensation that are typically included:

But what about things like health insurance premiums or life insurance? Those are generally not included unless the employee is directly paying them from their gross pay, and even then, there are exceptions. The key is to stay consistent with how you report compensation to your state’s workers’ comp office and to your IRS filings.

The Audit is About More Than Numbers

Workers’ comp audits are not just about math—they’re about risk management, compliance, and financial strategy. A well-prepared audit can help you understand where you’re spending money, where you’re overpaying, and where you can make adjustments to reduce your exposure.

One of the most powerful benefits of an audit is the clarity it brings. For example, if a business is consistently underreporting certain types of compensation, the auditor will catch it and adjust the premium accordingly. But it also means the business can use that data to refine its payroll practices and avoid surprises in the future.

“We didn’t realize how much of our 401(k) contributions were being counted. Once we adjusted our reporting, we were able to reduce our premium by nearly 10% the next year.”

—A business owner in the logistics industry

How to Prepare for the Audit: A Few Tips

If you’re preparing for a workers’ comp audit, here’s what you can do to make the process smoother:

  1. Review your payroll structure: Know exactly what you’re paying employees, including all types of compensation and benefits.
  2. Document everything: Keep records of how and when employees are paid, especially if you offer variable or performance-based compensation.
  3. Consult your broker: Ask questions about what is and isn’t included in the audit. Your insurance broker is your best ally in navigating the process.
  4. Be consistent: Whatever method you use to report compensation, stick with it from year to year. Inconsistencies can lead to disputes and higher premiums.

Remember, the goal of the audit isn’t to penalize you—it’s to ensure that your premiums are fair and reflective of your business’s true risk. Being proactive and informed can save you money and reduce stress when the auditor arrives.

Final Thoughts

Workers’ compensation is one of the most complex—and often misunderstood—areas of small business ownership. But understanding how 401(k) contributions and other forms of compensation factor into your audit can give you a strategic edge. It’s not just about compliance; it’s about managing your business more effectively, reducing risk, and protecting your bottom line.

So the next time your insurance auditor knocks on the door, you’ll be ready. And maybe even a little grateful—for the clarity, the correction, and the opportunity