Most plan sponsors worry about investment performance, participant complaints, cybersecurity, and government audits. What many don’t realize is that one of the most expensive mistakes a retirement plan sponsor can make often starts with a simple question that nobody bothers to ask:
“Who actually belongs in the plan?”
The answer is not always as obvious as it seems.
Under the Internal Revenue Code, businesses that are part of a controlled group or affiliated service group are generally treated as a single employer for qualified retirement plan purposes. While that sounds simple enough, the reality is anything but. The rules are complex, confusing, and often misunderstood by business owners, accountants, and even retirement plan providers.
When these rules are ignored, the consequences can be staggering.
The Employer You Forgot About
A common scenario involves a business owner who sponsors a 401(k) plan for one company while owning interests in other entities. Sometimes those entities are operating companies. Sometimes they are management companies. Sometimes they are medical practices, professional corporations, or consulting businesses.
The owner assumes that because one company sponsors the plan, the other companies don’t matter.
That assumption can be dangerous.
If those businesses are part of a controlled group under Code Section 414(b) or (c), or an affiliated service group under Code Section 414(m), the employees of those businesses generally must be considered when applying coverage and nondiscrimination rules.
The problem is that many sponsors don’t discover the issue until years later.
When Coverage Testing Becomes a Nightmare
Let’s assume a plan covers only the employees of Company A.
Unfortunately, Company B should have been included because it was part of the same controlled group.
Now all of Company B’s employees must be included when performing coverage testing.
What happens next is often ugly.
A plan that easily passed coverage testing suddenly fails. Employees who were never offered participation become excludable only if they satisfy the plan’s eligibility conditions. Highly compensated employee percentages change. Benefiting percentages change. Entire years of testing may need to be reconstructed.
The result is often corrective contributions for employees who never entered the plan but should have been considered during testing.
That bill can be enormous.
The Correction Nobody Budgeted For
I’ve seen sponsors spend years carefully managing plan expenses only to receive a correction proposal that dwarfs everything they ever saved.
The irony is that the sponsor wasn’t trying to do anything wrong.
They simply didn’t understand that another entity had to be included.
The IRS generally doesn’t care whether the mistake was intentional. If the plan failed coverage requirements, the failure has to be corrected.
Corrective contributions, lost earnings calculations, professional fees, legal fees, and compliance costs can quickly add up.
What looked like a minor ownership issue becomes a six-figure problem.
Affiliated Service Groups Are Even Worse
Controlled group rules are difficult enough. Affiliated service group rules can be even more confusing.
Many professional practices operate through multiple entities. Medical groups, law firms, accounting firms, engineering firms, and consulting organizations frequently create structures that were designed for operational or business reasons, not retirement plan compliance.
The affiliated service group rules were specifically created to prevent employers from splitting employees among multiple entities to avoid retirement plan coverage requirements.
The challenge is that many arrangements can trigger affiliated service group status without the owners realizing it.
A practice management company, administrative services company, or related professional entity can create issues that are not immediately obvious.
I’ve spent more than twenty-five years in this business and I still encounter situations where experienced professionals disagree about whether an affiliated service group exists.
That’s how complicated these rules can be.
Don’t Assume Your Payroll Company Is Checking
One of the most dangerous assumptions a sponsor can make is believing that somebody else has already reviewed the ownership structure.
Many payroll companies don’t do controlled group analyses.
Many recordkeepers don’t do controlled group analyses.
Many TPAs rely on information provided by the client.
If the sponsor never discloses related entities, nobody may ever ask the right questions.
Then years later, during an acquisition, audit, merger, plan termination, or due diligence review, the issue finally surfaces.
By then, the correction costs can be substantial.
The Best Time To Review Is Before There Is A Problem
The cheapest controlled group review is the one performed before the IRS, an auditor, or a buyer discovers an issue.
Every plan sponsor with multiple entities should periodically review ownership structures and business relationships.
The review becomes even more important when:
· New entities are formed.
· Ownership percentages change.
· Family members acquire interests in businesses.
· Professional practices create management companies.
· Businesses merge or acquire other companies.
· New retirement plans are established.
The cost of a review is usually insignificant compared to the cost of correcting years of failed coverage testing.
Final Thoughts
One of the most expensive words in the retirement plan business is “Oops.”
A controlled group or affiliated service group mistake often begins with an innocent misunderstanding and ends with corrective contributions that nobody expected to make.
Plan sponsors spend tremendous amounts of time worrying about market performance. In my experience, they should spend at least as much time worrying about qualification failures.
Markets go up and down.
A failed coverage test caused by a missed controlled group or affiliated service group member can produce a bill that is very real, very immediate, and very expensive.
That’s why every plan sponsor should periodically ask a simple question:
“Are we absolutely sure we’ve identified every employer that must be counted?”
If the answer isn’t a confident yes, it’s time to find out before the IRS, your auditor, or a buyer does it for you.