401(k)ology: Stumbling into the Top-Heavy Zone
Published April 8, 2026
If the company’s retirement plan is stockpiling money for a select group of owners and officers, the plan may be stumbling into the top-heavy zone, and that comes with extra compliance chores (and sometimes extra required contributions). Top-heavy rules under IRC §416 are essentially a fairness “backstop” that can require minimum employer contributions and faster vesting when key employees hold too much of the plan’s total account balances.
This post breaks down what top-heavy means, who counts as a key employee, what plan sponsors must do if the plan is top-heavy, and the common mistakes that catch plan sponsors off guard.
Top-heavy tests are performed each plan year along with other nondiscrimination testing. Top-heavy testing, unlike other compliance tests, is not a pass or fail. Rather, a plan is either top-heavy, or it is not. This post explains what it means for a qualified plan to be “top-heavy,” how the 60% test works, and when the test is measured. It also walks through who counts as a “key employee” and highlights practical nuances like family ownership attribution that can unexpectedly pull individuals into key status.
From there, the post covers what plan sponsors must do if the plan is top-heavy, including the minimum contribution requirements (with a brief section on defined benefit plans) and the accelerated vesting schedules that may apply in a top-heavy year. The post concludes with a section on the safe harbor top-heavy exemption, when it applies, and the most common ways sponsors accidentally lose the exemption.
What does “Top-Heavy” mean?
A plan is considered top-heavy when key employees hold more than 60% of the plan’s total assets (defined contribution plans) or accrued benefits (defined benefit plans). Top-heavy status typically impacts smaller retirement plans (less than 100 participants). The smaller the plan, the smaller the subset of non-key employees to offset the balances of the key employees in the test. But slightly larger plans are not immune, especially when there are profit sharing allocations and/or after-tax contributions included.
For a typical 401(k) plan (defined contribution plan), top heavy is a comparison of account balances:
Top-Heavy Ratio =
Total key employee account balances
Total all employee account balances
If the ratio is greater than 60%, the plan is top-heavy. There is no option to round down, and there are no de minimis amounts above that threshold. A plan at 60.01% is top-heavy.
What participants are included in the test?
Generally, any participant who performs at least one hour of service in the 12 months ending on the determination date is included in the test. Also, certain former employees and former key employees may be treated differently (for example, some former employees’ balances may be disregarded if they did not work during the testing period).
Distributions due to termination of employment, death and disability are added back to the account balances if they occur within the one-year period ending on the determination date. In-service distributions are added back if they occur within the five-year period ending on the determination date. In-service distributions include corrective distributions due to failed ADP/ACP testing, hardship distributions and loans.
When is top-heavy determined?
Top-heavy status is tested annually based on account balances as of the last day of the prior plan year. For calendar year plans, the “determination date” is December 31stof the prior plan year.
An exception applies when a plan is initially effective, setting the determination date as the last day of that plan year for both the initial year of the plan and the subsequent year. Let’s look at an example for a new plan:
Plan is effective April 1, 2026
Plan runs on a calendar year basis
The first plan year ends on December 31, 2026
The determination date for top-heavy status is December 31, 2026. If the plan is top-heavy as of that date, the top-heavy status applies to both the 2026 initial year and the 2027 subsequent plan year.
Who is a “Key Employee”?
Key employee status is defined under IRC §416(i) and is based on officer status and ownership.
An employee is a key employee if, at any time during the plan year, they are:
An officer with compensation above the annual threshold (indexed annually), with limits on how many employees may be treated as officers for this purpose.
A more than 5% owner (no pay threshold required).
A more than 1% owner with compensation greater than $150,000 (not indexed for inflation).
Officers: More than a title
When determining officer status for key employee determination, employers must consider the authority or decision making ability of that position rather than just the title. For example, banks are well known to have many employees with a Vice President title, but it is unlikely that any would meet the officer threshold for key employee status. The determinative factor is whether they exercise business discretion or authority over the bank.
The same is true in the other direction for employees that may not have a title that typically conveys a high level of authority, but they nonetheless have all of the duties and responsibilities of an officer. Employees in this situation are considered an officer for the key employee determination despite the unassuming title.
Ownership attribution: The “family factor”
When measuring ownership, ownership attributed from certain relatives is generally included (e.g., spouse, children, grandchildren, parents), which can “pull” family members into key status even if they personally own no stock of the employer.
Sponsor reality check: Many “surprise” top-heavy outcomes start with incomplete ownership data and missed family attribution. Be especially aware of children of owners who start working for the family business.
What happens if a plan is top-heavy?
If a plan is top-heavy for a year, IRC §416 requires minimum contributions and faster vesting.
Defined contribution plans (401(k)/profit sharing): The minimum contribution
Generally, non-key employees must receive a minimum employer contribution of 3% of IRC §415(c)(3) compensation for the year if the plan is top-heavy. If the highest contribution percentage for any key employee is less than 3%, the non-key minimum is reduced to that highest key percentage instead of 3%.
Two big “gotchas” the IRS calls out:
Non-key employee elective deferrals do not count toward the top-heavy minimum contributions in a 401(k) plan (employer match and non-elective contributions count).
There is no 1,000-hour requirement for a top-heavy allocation in a defined contribution plan (any non-key employee employed on the last day of the plan year is due the top-heavy minimum contribution).
Vesting: Top-heavy requires faster schedules
Top-heavy plans must satisfy at least one of these vesting schedules for employer-derived benefits:
3-year cliff (100% at 3 years), or
6-year graded (20% at 2 years, then 40/60/80/100 with full vesting after year 6).
Many plans use a vesting schedule that automatically satisfies the top-heavy vesting requirements so that any change in top-heavy status does not impact the vesting schedule.
Defined benefit plans: The short version
The top-heavy determination for defined benefit plans (e.g., pension plans and cash balance plans) is based on accrued benefits (often expressed as present value), not account balances.
If top-heavy, the plan must ensure each non-key employee receives a minimum accrued benefit based on the statutory “applicable percentage” formula (generally up to 2% × years of service, capped at 20%, per the statute’s rules).
Translation: Defined benefit plan top-heavy corrections are usually more actuarial, but the compliance trigger and “minimum benefit” concepts are the same.
Safe Harbor “Top-Heavy” Exemption
The safe harbor top-heavy exemption provides that certain safe harbor 401(k) plans meeting specific requirements for the plan year are not subject to top-heavy testing (and therefore do not have top-heavy minimum contribution/vesting obligations).
The IRS explains this concept in plain terms as follows: “There’s no need to do top-heavy testing for a safe harbor 401(k) that receives only elective deferrals and safe harbor minimum contributions.” The safe harbor minimum contributions include the basic safe harbor match, enhanced safe harbor match, safe harbor nonelective, or QACA safe harbor contributions. Note that plans may be exempt one year and not exempt the next if the benefits change.
Benefit that removes top-heavy exemption #1: Making a discretionary nonelective/profit-sharing contribution
Rev. Rul. 2004-13 includes a scenario where the plan is safe harbor, but the employer makes a discretionary nonelective contribution in that year. The IRS concludes the plan fails the top-heavy exemption for that year.
Summary: Plan terms that allow profit sharing contributions are permitted, but actually funding the contribution may cause the plan to lose its “safe harbor-only” exemption from the top-heavy test.Benefit that removes top-heavy exemption #2: Allocating forfeitures like a profit-sharing/nonelective contribution
Rev. Rul. 2004-13 also includes a scenario where forfeitures occur and are allocated in the same manner as nonelective contributions. The IRS concludes the exemption does not apply for that year.
Summary: Even if the employer does not make a new discretionary contribution, the forfeiture allocation method can “add” a non-safe-harbor type allocation and spoil the exemption for the year.Benefit that removes top-heavy exemption #3: Suspending safe harbor match for the year
The IRS resource guide notes that if a plan suspends safe harbor matching contributions for a plan year (using the applicable safe harbor suspension rules), the match may no longer be treated as safe harbor for that year, and the plan will become subject to top-heavy rules.
Summary: Even if an employer suspends the safe harbor match because it is operating at an economic loss for the year, any suspension may remove the top-heavy exemption.Benefit that removes top-heavy exemption #4: Immediate eligibility for deferrals, but match eligibility delayed (e.g., 1-year wait)
Rev. Rul. 2004-13 includes a scenario where employees can defer immediately but aren’t eligible for safe harbor matching contributions until after completing a year of service; the IRS concludes the plan does not satisfy the exemption requirements.
Summary: A “split eligibility” design (e.g., deferrals now, match later) can break the safe harbor top-heavy exemption for that year.
Note: SECURE Act 2.0 provides a welcome change for certain 401(k) plans allowing them to treat the otherwise excludable employees separately for top-heavy testing purposes. However, this change does not extend to safe harbor match 401(k) plans. Absent further guidance or a technical correction made to the Code, safe harbor 401(k) plans must follow the split eligibility rules when it comes to top-heavy plan requirements.
Conclusion
When a plan’s balances tilt too heavily toward owners and officers, the law steps in to protect rank-and-file employees through mandatory contributions and faster vesting designed to avoid the plan being “top-heavy.” Because top-heavy status is determined annually and applies prospectively, plan sponsors have the ability to budget for required minimum contributions or limit contributions on behalf of key employees. Regular monitoring of top-heavy compliance ensures the process is not something for plan sponsors to fear, but instead it is a routine matter they can confidently assess and confirm prior to each plan year.
Thanks for reading and keep following 401(k)ology as we continue untangling the complexities of modern plan administration, one topic at a time. Newfront Retirement Services team is ready to help your organization make sense of all the regulations. Feel free to contact me or just connect to keep up to date on all things ERISA 401(k): Joni_LinkedIn and 401(k)ology
Helpful Links:
IRS - Fixing common plan mistakes — Top-heavy errors in defined contribution plans
401(k)ology – Safe Harbor 401(k) Plans
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