What Is a Top-Heavy 401(k) Plan?

A 401(k) can become top-heavy without receiving a single contribution during the year.

That fact exposes the biggest misunderstanding about the rule.

Top-heavy testing does not ask whether owners and executives received more than 60% of this year's contributions.

It asks whether more than 60% of the applicable accumulated plan value belongs to key employees.^[1][3][4]

For an existing calendar-year plan, the determination is generally based on account values as of the last day of the preceding plan year.^[1][2]

So a plan evaluating top-heavy status for 2026 usually starts with:

December 31, 2025

account balances—not December 31, 2026 balances.

That timing can turn a plan's history of owner contributions and investment growth into a current-year employer contribution obligation for non-key employees.

Key Takeaways

• A defined contribution plan is generally top-heavy when the applicable value of key-employee accounts exceeds 60% of the applicable total plan value.^[1][3][4]
• The test is based on accumulated account balances and required adjustments, not only current-year contributions.^[3]
• An existing calendar-year plan generally tests 2026 status using a December 31, 2025 determination date.^[1]
• Key employees must be identified under Section 416 before the ratio can be trusted. INV-085 explains that classification.
• Some former employees' balances are excluded; former key employees can receive special treatment.^[1]
• Certain distributions, rollovers and other amounts require adjustments before calculating the ratio.^[1]
• Related plans can have to be aggregated, so testing one 401(k) in isolation can be wrong.^[1][6]
• A top-heavy defined contribution plan generally owes eligible non-key employees an employer allocation of up to 3% of compensation.^[1][2][3]
• If the highest applicable key-employee contribution percentage is below 3%, the non-key minimum can generally be that lower percentage.^[1]
• Non-key employee elective deferrals do not satisfy the employer's top-heavy minimum.^[3]
• A non-key employee generally does not need 1,000 hours of service to receive the top-heavy minimum if the employee otherwise meets the applicable last-day employment condition.^[3]
• SIMPLE 401(k) plans are exempt from the ordinary top-heavy rules.^[4][5]
• Certain safe-harbor 401(k) and QACA structures are exempt when the plan contains only the permitted elective deferrals and qualifying safe-harbor contributions.^[1][4][5]
• A safe-harbor label by itself does not answer the top-heavy question.

The 60% Test

The simplified ratio is:

Adjusted key-employee plan value ÷ Adjusted total plan value

If the result is:

more than 60%

the plan is generally top-heavy.^[1][3]

That sounds simple.

Most errors happen before the division.

The difficult work is determining:

• who is key
• which participants belong in the test
• which balances are included
• which distributions are added back
• which rollovers are removed
• whether another employer plan must be aggregated
• which determination date applies

A calculator cannot repair a bad population.

Example: Straight 62% Ratio

Adjusted key-employee balances:

$3,100,000

Adjusted total plan balances:

$5,000,000

Ratio:

$3,100,000 ÷ $5,000,000 = 62%

Because 62% is more than 60%, the plan is generally top-heavy.

There is no 5-point tolerance band.

IRS guidance is blunt: once the applicable ratio exceeds 60%, the plan is top-heavy.^[3]

Exactly 60% Is Different From More Than 60%

The threshold is:

more than 60%.^[1][3]

A ratio of exactly:

60.00%

does not exceed the threshold.

A ratio of:

60.01%

does.

This boundary matters in a small plan where one distribution, rollover or misclassified owner can move the result.

Top-Heavy Is Not a Contribution Test

Suppose the plan makes no contributions in 2026.

Owners already accumulated most of the money during prior years.

Investment returns increase their balances further.

The plan can still be top-heavy for 2026 because Section 416 focuses on the applicable accumulated account values measured under the determination-date rules.^[3]

IRS specifically notes that a plan can become top-heavy after a year in which no contributions are made.^[3]

That point is more important than it looks.

A sponsor cannot skip the test because:

"We didn't fund profit sharing this year."

The prior balance concentration still exists.

Determination Date: Test the Right Year

For an existing plan, the top-heavy determination date is generally the:

last day of the preceding plan year.^[1][3]

For a calendar-year plan:

Top-heavy status for 2026

Determination date:

December 31, 2025

Top-heavy status for 2027

Determination date:

December 31, 2026

This is why a top-heavy test performed during 2026 can use prior-year balances and prior-year key-employee classification.

INV-085 explains the related officer-threshold timing issue.

The Determination Date Is Not Just an Accounting Cutoff

It decides which plan values and employee classifications feed the test.

Suppose an owner sells the company on:

January 15, 2026

The sponsor asks whether the person is still relevant to the 2026 top-heavy test.

You cannot answer by looking only at ownership on January 15.

The 2026 test generally starts from the 2025 determination-date framework.

Plan-year timing comes before current-year intuition.

First Identify Key Employees

The numerator contains key-employee plan value.

If the key list is wrong, the ratio is wrong.

INV-085 covers the three principal key-employee routes:

• qualifying officer above the applicable indexed threshold
• more-than-5% owner
• more-than-1% owner with compensation over $150,000

Family attribution can change ownership.

So can:

• related companies
• ownership changes
• spouses
• children
• parents
• grandparents

A payroll-only census is not enough.

Key Employee Is Not HCE

Top-heavy testing uses:

key employees

ADP and ACP testing generally use:

highly compensated employees.

Those are different legal classifications.

INV-084 explains HCE status.

A high-paid non-owner can be an HCE and still be non-key.

A modestly paid 6% owner can be key.

Copying the HCE list into the top-heavy test is a basic classification error.

Which Participants Count?

The top-heavy calculation is not simply:

every account currently visible on the recordkeeper website.

IRS guidance excludes certain balances and applies special rules to others.^[1]

One important distinction is whether the person performed services during the relevant testing period.

Former Employee With an Old Balance

Assume a former employee:

• left the company several years ago
• performed no services during the relevant testing period
• left $90,000 in the 401(k)

IRS guidance says a former employee who did not work even one hour during the testing period can be excluded from the top-heavy calculation.^[1]

The recordkeeper can still show the $90,000 account.

That does not mean the balance belongs in the top-heavy denominator.

Former Key Employee Can Be Excluded Differently

Suppose a person was once a key employee but no longer meets the key definition during the relevant period.

IRS instructs sponsors to exclude a former key employee's balance from the test rather than simply move it into the non-key denominator.^[1]

That distinction can materially change the ratio.

Moving a former key balance into the denominator would dilute the percentage.

Excluding it altogether does something different.

Account Balances Need Adjustments

The year-end recordkeeping balance is a starting point.

It is not always the final testing number.

IRS's current top-heavy guidance identifies adjustments involving:^[1]

Amounts that may need to be added back

• distributions during the relevant testing period
• cash-out distributions to terminated employees
• specified loan amounts during the testing period

Amounts that may need to be subtracted

• qualifying rollover contributions from another employer plan or IRA
• certain profit-sharing amounts declared but not actually contributed by the determination date

The detailed Section 416 rules control.

A TPA should not run the test from raw year-end balances without applying the required adjustments.

Why Add Back a Distribution?

Suppose a key employee has:

$600,000

in the account during the year and takes a:

$200,000 distribution

before the determination date.

A raw year-end balance might show only:

$400,000

If the testing rules require the distribution to be added back, using only $400,000 would understate the key employee's economic concentration.

The rule prevents a distribution from automatically making a concentrated plan look less top-heavy.

Example: Distribution Flips the Result

Raw key balances:

$1,160,000

Raw total balances:

$2,000,000

Raw ratio:

58%

Assume a required $120,000 key-employee distribution add-back changes the applicable values to:

Key:

$1,280,000

Total:

$2,120,000

Adjusted ratio:

60.38%

The plan can move from apparently not top-heavy to top-heavy because the raw ledger omitted a required adjustment.

The exact treatment depends on the applicable Section 416 rule and facts.

The lesson is not the specific example percentage.

It is that raw account balances are not automatically testing balances.

Rollover Contributions Can Distort the Denominator

Suppose a non-key employee rolls:

$500,000

from a former employer's 401(k) into the current plan.

If that rollover were blindly included, the denominator would rise sharply even though the money did not come from benefits earned under this employer's plan.

IRS guidance identifies rollover contributions from another employer's plan or IRA as amounts that may be removed for the top-heavy calculation.^[1]

This prevents outside retirement money from artificially changing the plan's concentration measure.

Related Plans Can Have to Be Combined

Testing one plan by itself can be wrong.

Section 416 has aggregation rules.

IRS training guidance describes a required aggregation group that generally includes:^[6]

• each employer plan in which a key employee participates during the determination-date year or specified prior period
• other employer plans that must be aggregated with those plans to satisfy applicable nondiscrimination or coverage requirements

If the required aggregation group is top-heavy, the plans in that required group are treated as top-heavy under the rules.^[6]

That can surprise an employer whose individual 401(k) ratio is below 60%.

Example: One Plan Looks Fine Alone

Employer sponsors:

Plan A

Key balances:

$500,000

Total balances:

$1,000,000

Ratio:

50%

Plan B

Key balances:

$900,000

Total balances:

$1,000,000

Ratio:

90%

If Section 416 requires the plans to be aggregated, the relevant group ratio becomes:

$1.4 million ÷ $2.0 million = 70%

Plan A's standalone 50% result does not necessarily protect it.

The employer has to test the required aggregation group.

Permissive Aggregation Is Different

IRS guidance also recognizes a permissive aggregation group.^[6]

An employer can sometimes add plans that are not required to be aggregated if the resulting group satisfies the applicable Section 401(a)(4) and 410 requirements.^[6]

This is not a casual planning trick.

It has its own qualification conditions.

The distinction matters because required aggregation is mandatory while permissive aggregation is optional when the rules permit it.

Related Businesses Matter Too

IRS warns that related businesses can change the top-heavy analysis.^[1]

That includes situations involving:

• controlled groups
• common ownership
• spouses owning separate businesses
• multiple plans maintained across related entities

A sponsor should tell the TPA about business ownership changes before testing.

The TPA cannot aggregate a plan it does not know exists.

What Happens When the Plan Is Top-Heavy?

For a defined contribution plan, top-heavy status generally creates an employer minimum contribution obligation for eligible non-key employees.^[1][2][3]

The headline number is:

3% of compensation

But 3% is not always the required amount.

The General 3% Minimum

IRS states that the top-heavy minimum for a non-key employee is generally:

3% of total compensation for the plan year.^[1][3]

That compensation measure is broader than:

compensation earned only after the employee entered the plan.

Using participation-date compensation instead of full-year compensation can understate the required contribution.

Example: Participant Enters Midyear

Employee earns:

• January through June: $30,000
• July through December: $35,000

Total annual compensation:

$65,000

Employee enters the plan July 1.

If the full 3% top-heavy minimum applies, the calculation generally begins with total annual compensation:

$65,000 × 3% = $1,950

not merely:

$35,000 × 3% = $1,050.

The applicable compensation definition and plan terms still matter.

The Minimum Can Be Less Than 3%

IRS guidance provides a lower ceiling when the highest applicable contribution percentage for a key employee is below 3%.^[1]

Suppose the highest key-employee percentage is:

2%

The required top-heavy minimum for non-key employees can generally be:

2%

rather than 3%.^[1]

This is why saying:

"Top-heavy always means a 3% contribution"

is too broad.

Example: 2% Key Allocation

Highest key-employee contribution percentage:

2%

Non-key employee compensation:

$80,000

General minimum:

$80,000 × 2% = $1,600

subject to the detailed Section 416 rules and plan document.

If the highest key percentage were at least 3%, the general 3% minimum would ordinarily apply.

Employee Deferrals Do Not Satisfy the Non-Key Minimum

A non-key employee contributes:

6% of pay

through salary deferrals.

That does not mean the employer owes nothing.

IRS states that a non-key employee's elective deferrals cannot be counted toward satisfying the top-heavy minimum employer contribution.^[3]

The employee's own 401(k) savings are not a substitute for the employer's Section 416 obligation.

Key-Employee Deferrals Can Affect the Benchmark

IRS's practical guidance says elective deferrals are considered for key employees when determining the highest key contribution percentage relevant to the top-heavy minimum.^[1]

That creates an asymmetry:

Key employee

Deferrals can matter to the percentage used in the minimum calculation.

Non-key employee

Personal deferrals do not satisfy the employer minimum.

This is one reason the contribution source needs to be coded correctly.

Last-Day Employment Can Matter

IRS says the plan may require a non-key employee to be employed on the:

last day of the plan year

to receive the top-heavy minimum.^[1][3]

The plan document controls whether that last-day condition applies.

This is different from imposing a 1,000-hour condition.

No 1,000-Hour Requirement for the Defined Contribution Minimum

IRS specifically identifies this as a commonly overlooked rule:

There is no 1,000-hour requirement for the top-heavy allocation in a defined contribution plan.^[3]

Suppose a non-key employee:

• works 400 hours
• remains employed on December 31
• otherwise satisfies the plan's top-heavy eligibility terms

The employer generally cannot deny the top-heavy minimum solely because the employee failed to reach 1,000 hours.^[3]

This catches employers that copy their ordinary profit-sharing allocation condition into the top-heavy calculation.

Example: Part-Time Non-Key Employee

Annual compensation:

$20,000

Hours worked:

400

Still employed December 31:

Yes

Full top-heavy minimum percentage:

3%

Potential minimum:

$600

The 400-hour total does not by itself eliminate the requirement.^[3]

Vesting Rules Still Matter

Top-heavy plans must satisfy minimum vesting standards for applicable employer contributions.^[2][4][5]

IRS lists minimum schedules such as:^[1][2]

Three-year cliff

• before 3 years: 0%
• at 3 years: 100%

Six-year graded

• less than 2 years: 0%
• 2 years: 20%
• 3 years: 40%
• 4 years: 60%
• 5 years: 80%
• 6 years: 100%

A plan can vest faster.

Safe-harbor contributions can have their own stricter vesting requirements depending on the design.

Top-Heavy Is Not ADP Failure

A plan can:

• pass ADP/ACP testing
• still be top-heavy

or:

• fail ADP/ACP testing
• not be top-heavy.

Why?

They measure different things.

INV-084 and INV-085 explain why the employee classifications differ too.

Example: Pass ADP, Fail Top-Heavy

Owners have large old balances from years of contributions and investment growth.

Current NHCE participation is strong enough for the ADP test to pass.

The accumulated key balances still represent:

72%

of applicable plan value.

The plan can be top-heavy despite a clean ADP result.

Current-year contribution equality does not erase historical balance concentration.

Safe Harbor Is Not a Universal Exemption

Some safe-harbor 401(k)s are exempt from top-heavy rules.

The exemption depends on the plan's contribution structure.^[1][4][5]

IRS says the top-heavy rules do not apply when the safe-harbor 401(k) consists solely of the applicable:

• elective deferrals
• qualifying safe-harbor contributions.^[1][4][5]

That can include qualifying safe-harbor match or nonelective structures.

Qualified Automatic Contribution Arrangements

IRS also states that qualifying automatic contribution arrangements, or QACAs, can fall within the top-heavy exception when the applicable conditions are satisfied.^[1][5]

A QACA combines automatic enrollment with a statutory safe-harbor contribution structure.

INV-055 covers automatic enrollment.

Extra Contributions Can Reopen the Question

Suppose a safe-harbor 401(k) also makes:

• discretionary profit sharing
• non-safe-harbor matching contributions
• another contribution outside the exempt safe-harbor-only structure

The employer should not assume the top-heavy exception still applies.

The plan's actual contributions and document design need to be tested against the Section 416 exception.^[1][4][5]

This is why:

"We have a safe harbor plan"

is not enough information.

SIMPLE 401(k) Plans Are Exempt

IRS states that SIMPLE 401(k) plans are not subject to the ordinary top-heavy requirements.^[4][5]

That exemption is specific to the SIMPLE 401(k) structure.

It should not be generalized to every small-employer plan.

INV-022 explains the broader 401(k) framework.

Owner-Only Plan Adds Employees: Classic Top-Heavy Risk

Consider a business owned by spouses.

For years, the plan covered only the two owners.

They accumulated:

$900,000

The business then hires two non-owner employees who become eligible.

New employees have only:

$20,000

combined in the plan.

Even with equal current contribution rates, the plan's accumulated value is overwhelmingly concentrated among key employees.

IRS specifically flags expanding owner-dominated plans as a common top-heavy fact pattern.^[2]

The employer may now owe top-heavy minimum contributions to the non-key employees.

High Turnover Can Increase the Risk

IRS notes that smaller plans and plans with high turnover are more likely to become top-heavy.^[2][3]

Why?

Non-key employees can:

• leave
• take distributions
• roll out balances

while owners and key employees remain for years and continue accumulating assets.

The denominator can shrink even when key balances do not rise dramatically.

The concentration ratio can therefore increase without any change in current contribution policy.

Market Performance Can Change the Ratio

Suppose key employees hold a different investment mix from non-key employees.

Key accounts rise sharply.

Non-key accounts lag.

No contribution formula changed.

The top-heavy ratio can still move because the test uses account value.

Investment returns do not know which dollars were employer contributions.

The ratio measures the resulting plan concentration.

Related Employer Acquisition Can Change the Test

A company acquires another business with its own retirement plan.

The transaction can affect:

• employer aggregation
• plan aggregation
• key-employee population
• balances included in the group

The sponsor should not wait for year-end testing to tell the TPA about the acquisition.

Corporate transactions are retirement-plan testing events.

INV-083 makes the same point for annual compliance data more broadly.

Plan Document Provisions Matter

Most qualified plans must contain top-heavy provisions that become operative when the plan is top-heavy.^[4][5]

The document can specify matters such as:

• how minimum contributions are allocated
• last-day employment condition
• vesting
• interaction with other employer contributions
• plan aggregation mechanics where applicable

A sponsor should not invent the top-heavy correction from a spreadsheet.

Read the plan document.

Ordinary Employer Contributions Can Sometimes Satisfy the Minimum

A plan does not always need a separate line item labeled:

Top-Heavy Contribution

Employer contributions already allocated to a non-key employee can count toward the applicable minimum when the Section 416 and plan rules permit.

The key question is whether the employee's employer allocation reaches the required percentage under the correct compensation definition.

Employee elective deferrals are different: they do not satisfy the non-key minimum.^[3]

Example: Match Already Reaches 3%

Non-key employee compensation:

$70,000

Employer contributions already allocated under the plan:

$2,100

Allocation percentage:

3%

If those employer contributions count under the applicable top-heavy rules, no extra contribution may be needed solely to reach the 3% minimum.

Do not assume this outcome for every match design.

The plan and Section 416 rules need to be applied to the actual contribution sources.

Compensation Definition Can Create a Second Error

The employer correctly determines the plan is top-heavy.

It contributes 3%.

But it calculates 3% from the wrong compensation number.

IRS identifies compensation-definition errors as a separate recurring 401(k) failure and specifically points sponsors to the compensation definition used for top-heavy minimum contributions.^[7]

A correct percentage applied to the wrong compensation is still wrong.

Correction: Missing Minimum Is Not Self-Healing

If a sponsor discovers that a required top-heavy minimum was not made, IRS directs the employer to contribute and allocate the missing amount, adjusted for earnings, to affected non-key employees under the applicable correction framework.^[2][7]

The current correction method should be checked against the version of EPCRS in effect when the failure is corrected.

Do not rely on an old correction article for:

• self-correction availability
• timing
• filing method
• user fees

Those rules can change.

The economic correction principle is stable:

Affected participants should not be left short because the annual test was missed.

The Best Annual Review Starts Before the Ratio

Use this order:

1. Identify all related employers and plans

Do not assume one legal entity means one testing universe.

2. Establish the determination date

For an existing calendar-year plan testing 2026:

December 31, 2025

3. Build the correct key-employee list

Use INV-085.

4. Determine which participants and balances belong in the test

Review active service and former-key rules.

5. Apply required balance adjustments

Distributions, rollovers and other items matter.

6. Test required aggregation groups

Do not stop at a standalone plan ratio when aggregation is required.

7. Calculate the percentage

Key value ÷ total applicable value.

8. If over 60%, calculate the non-key minimum

Use the plan document and correct compensation.

That sequence is harder to misuse than starting with a spreadsheet formula.

A Top-Heavy Review Table

If the sponsor cannot answer these questions, a reported 59% or 61% ratio deserves scrutiny.

Frequently Asked Questions

What is a top-heavy 401(k)?

A 401(k) is generally top-heavy when more than 60% of the applicable plan value is attributable to key employees under Section 416.^[1][3][4]

Is the test based on this year's contributions?

No. It generally uses accumulated account balances measured under the determination-date rules, with required adjustments.^[1][3]

Can a plan become top-heavy when no contributions were made?

Yes. IRS specifically notes that accumulated balances can cause top-heavy status even after a year in which no contributions were made.^[3]

What date is used for a 2026 calendar-year plan?

For an existing calendar-year plan, the determination date for 2026 is generally December 31, 2025.^[1]

What percentage makes a plan top-heavy?

More than 60% of the applicable plan value attributable to key employees.^[1][3]

Is exactly 60% top-heavy?

The statutory threshold is generally more than 60%. Exactly 60% does not exceed the threshold.^[1][3]

Is every HCE a key employee?

No. HCE and key employee are different classifications. HCEs matter to tests such as ADP/ACP; key employees drive top-heavy testing.

What is the top-heavy minimum contribution?

The general defined contribution minimum is up to 3% of a non-key employee's compensation, subject to the applicable key-employee contribution percentage and Section 416 rules.^[1][2][3]

Is the minimum always 3%?

No. If the highest applicable contribution percentage for a key employee is less than 3%, the non-key minimum can generally be that lower percentage.^[1]

Do my own 401(k) deferrals count toward the top-heavy minimum?

Not if you are a non-key employee. IRS states that non-key elective deferrals do not count toward satisfying the employer's top-heavy minimum.^[3]

Does a non-key employee need 1,000 hours to get the minimum?

IRS states that a defined contribution top-heavy allocation generally cannot be conditioned on a 1,000-hour requirement. A plan can use an applicable last-day employment condition.^[3]

Are safe-harbor 401(k)s exempt?

Certain safe-harbor 401(k)s are exempt when the plan consists solely of the applicable elective deferrals and qualifying safe-harbor contributions. Other contribution structures can require top-heavy analysis.^[1][4][5]

Are QACA plans exempt?

Qualifying automatic contribution arrangements can be exempt when the applicable statutory conditions are met.^[1][5]

Are SIMPLE 401(k) plans subject to top-heavy rules?

No. IRS states that SIMPLE 401(k) plans are exempt from the ordinary top-heavy requirements.^[4][5]

Can another employer plan affect my 401(k)'s top-heavy result?

Yes. Required aggregation rules can force multiple plans to be tested together.^[1][6]

What if the employer missed a required top-heavy contribution?

IRS directs employers to correct the missed allocation for affected non-key employees, including applicable earnings, under the current correction framework.^[2][7]

The Number to Distrust First

A top-heavy report that says:

59.4% — PASS

looks precise.

Before trusting it, verify:

• the determination date
• key-employee classification
• related plans
• former employees
• former key employees
• distributions
• rollovers
• compensation data

Precision at the end of the calculation does not fix bad inputs at the beginning.

The top-heavy formula is easy.

Building the correct numerator and denominator is the real work.

Sources & References

1. IRS: Is My 401(k) Top-Heavy?
2. IRS: 401(k) Plan Fix-It Guide — Top-Heavy Minimum Contributions
3. IRS: Fixing Common Plan Mistakes — Top-Heavy Errors in Defined Contribution Plans
4. IRS: 401(k) Plan Qualification Requirements
5. IRS Publication 560: Retirement Plans for Small Business
6. 26 CFR §1.416-1 — Questions and Answers on Top-Heavy Plans
7. IRS: 401(k) Plan Fix-It Guide

Educational Disclaimer

ROIStreet publishes educational content about retirement-plan testing and administration. This article is not legal, tax, fiduciary or plan-administration advice. Top-heavy status depends on the plan year, determination date, key-employee classification, account-balance adjustments, related plans, compensation, plan terms and current law.

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