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15.4 Otherwise Excludable Employees: When Disaggregation Rescues a Failing Test
ASPPA Qualified 401 k
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1 Chapter 1: Plan Qualification Requirements
1.1 IRC §401(a) Core Qualification Requirements & Exclusive Benefit Rule 1.2 Written Plan Documents, Pre-Approved vs. Individually Designed Plans & Restatements 1.3 Anti-Alienation, Qualified Domestic Relations Orders (QDROs) & Claims Procedures
2 Chapter 2: Retirement Plan Types & Structures
2.1 Defined Contribution vs. Defined Benefit Fundamentals & Hybrid Cash Balance Plans 2.2 Profit Sharing, Money Purchase & 401(k) Cash or Deferred Arrangements (CODAs) 2.3 Other DC Designs: ESOPs, SEPs, SIMPLE IRAs, SIMPLE 401(k)s, 403(b)s & 457(b)s
3 Chapter 3: Eligibility & Participation Rules
3.1 Statutory Age and Service Conditions Under IRC §410(a) 3.2 Hours-of-Service Crediting vs. Elapsed-Time Method 3.3 Plan Entry Dates, Dual Eligibility & Computation Periods 3.4 Amending Plan Eligibility Requirements & Explaining Eligibility to Plan Sponsors
4 Chapter 4: Special Eligibility Provisions & Long-Term Part-Time Employees
4.1 Excludable Employee Classifications & Job Categories 4.2 SECURE 2.0 Long-Term Part-Time (LTPT) Rules (500 Hours / 2-Year Standard) 4.3 Breaks in Service, Re-Employment Rules & Service Re-Crediting 4.4 Service Across Employers: Predecessor Employers, M&A Transitions, Leased Employees & Independent Contractors
5 Chapter 5: Vesting Schedules & Forfeiture Handling
5.1 Statutory Vesting Schedules: 3-Year Cliff, 2-to-6-Year Graded & 100% Immediate 5.2 Calculating Years of Vesting Service, Computation Periods & Service Exclusions 5.3 Forfeiture Determination, Timing, Allocation Methods & Re-Crediting 5.4 Mandatory Full-Vesting Events, Vesting Schedule Amendments & the 3-Year Election
6 Chapter 6: Employee Contributions & Deferral Limits
6.1 Pre-Tax Elective Deferrals & Designated Roth 401(k) Contributions 6.2 IRC §402(g) Annual Limits, Age-50 Catch-Up & SECURE 2.0 Super Catch-Up 6.3 Voluntary After-Tax Contributions & Automatic Contribution Arrangements (ACA, EACA) 6.4 Rollover Contributions Into the Plan: Eligible Sources, Direct vs. 60-Day Rollovers & Invalid Rollovers
7 Chapter 7: Employer Contributions & Allocations
7.1 Employer Matching Contributions: Fixed, Discretionary & Tiered Formulas 7.2 Discretionary Profit-Sharing: Pro-Rata Comp-to-Comp & Permitted Disparity (Social Security Integration) 7.3 Age-Weighted Allocations, Cross-Testing / New Comparability & Allocation Conditions 7.4 IRC §415(c) Annual Additions Limits, Excess Corrections & §404 Deduction Caps
8 Chapter 8: Safe Harbor 401(k) Plan Design
8.1 Traditional Safe Harbor Formulas: 3% Nonelective vs. Basic and Enhanced Matching 8.2 Qualified Automatic Contribution Arrangement (QACA) Safe Harbor 8.3 Safe Harbor Notice Rules, Mid-Year Elections, Suspension & SECURE 2.0 Flexibility 8.4 Safe Harbor Advantages, Disadvantages & the Top-Heavy Exemption 8.5 Verifying Safe Harbor Contribution Compliance & Comparing Safe Harbor to Non-Safe Harbor Plans
9 Chapter 9: Participant Loans & Compliance
9.1 IRC §72(p) Statutory Loan Limits ($50,000 / 50% Vested Balance Calculation) 9.2 Loan Terms: 5-Year Amortization, Principal Residence Exception & Interest Rates 9.3 Loan Defaults, Cure Periods, Deemed Distributions vs. Plan Loan Offsets
10 Chapter 10: Plan Distributions & Distributable Events
10.1 Distributable Events: Severance, Death, Disability & Normal Retirement 10.2 In-Service Withdrawals, Hardship Distributions & SECURE 2.0 Emergency Access 10.3 IRC §72(t) 10% Early Distribution Penalty & Statutory Exceptions 10.4 QJSA and QPSA Survivor Annuity Rules, the DC Plan Exemption & Spousal Consent Administration 10.5 Distribution Restrictions by Contribution Source & Plan Termination Distributions
11 Chapter 11: Mandatory Cash-Outs, Taxation & RMDs
11.1 Mandatory Cash-Out Limits ($7,000 Threshold) & Automatic Rollover IRAs 11.2 Taxation of Distributions, 20% Mandatory Federal Withholding & Direct Rollovers 11.3 Required Minimum Distributions (RMDs) Under IRC §401(a)(9) & SECURE 2.0 (Age 73) 11.4 Distribution Tax Reporting: Form 1099-R Codes, Form 945, In-Kind Distributions & Net Unrealized Appreciation
12 Chapter 12: Compensation Definitions for Testing & Allocations
12.1 IRC §415 Statutory Compensation Definitions: W-2, Box 1 & Section 3401(a) 12.2 IRC §414(s) Safe-Harbor vs. Custom Compensation & Nondiscrimination Testing 12.3 IRC §401(a)(17) Annual Compensation Limit & Deemed / Partial Year Rules 12.4 Applying the Plan's Compensation Definition: Components, Payroll Mapping & Common Administrative Errors
13 Chapter 13: Highly Compensated Employee (HCE) Determination
13.1 IRC §414(q) Statutory Tests: 5% Owners & Compensation Lookback ($160,000 Threshold) 13.2 Top-Paid 20% Group Election & Determination Year Mechanics 13.3 Family Attribution Rules Under IRC §318 / §1563 in HCE Determination 13.4 Former HCEs, Short Plan Years & Non-Calendar-Year HCE Determination
14 Chapter 14: Minimum Coverage Testing: Ratio Percentage Test
14.1 IRC §410(b) Coverage Framework, Testing Group & Statutory Excludable Employees 14.2 Calculating Benefiting Participants & The Ratio Percentage Test (70% Standard) 14.3 Testing Frequencies (Daily, Quarterly, Annual) & Controlled Group Impacts 14.4 Deemed-Pass Situations & Correcting a Failed Coverage Test
15 Chapter 15: Minimum Coverage: Average Benefits Test & Aggregation
15.1 The Average Benefits Test: Nondiscriminatory Classification (Safe/Unsafe Harbor) 15.2 Average Benefit Percentage Test (ABPT) Mechanics & Calculation 15.3 Mandatory Disaggregation, Permissive Aggregation & Line of Business (SLOB) Rules 15.4 Otherwise Excludable Employees: When Disaggregation Rescues a Failing Test
16 Chapter 16: ADP and ACP Testing Fundamentals
16.1 Actual Deferral Percentage (ADP) Test: Eligible Participants & Included Deferrals 16.2 Actual Contribution Percentage (ACP) Test: Matching & After-Tax Contributions 16.3 Testing Standards: The 1.25 Test vs. 2.0 / 2% Spread Test & Prior Year vs. Current Year Elections 16.4 Why ADP and ACP Testing Exists & Which Plans Are Statutorily Exempt 16.5 Shifting Techniques: Moving Contributions Between the ADP and ACP Tests 16.6 Permissive Disaggregation & Restructuring to Pass the ADP and ACP Tests
17 Chapter 17: Correcting Failed ADP/ACP Tests
17.1 Calculating the Total Excess: Ratio Leveling vs. Dollar Leveling to Participants 17.2 Corrective Distributions to HCEs: Refund Calculations, Income Allocations & Withholding 17.3 Alternative Corrections: QNECs, QMACs (Bottom-Up vs. Pro-Rata) & Recharacterization to Catch-Up 17.4 Statutory Deadlines: 2.5-Month Rule, EACA 6-Month Window, §4979 10% Excise Tax & EPCRS Self-Correction 17.5 Switching Between Prior-Year and Current-Year Testing: Advantages, Limits & Anti-Abuse Rules
18 Chapter 18: Top-Heavy Testing & Compliance
18.1 Identifying Key Employees: Officers, 5% Owners & 1% Owners (> $150,000) 18.2 The 60% Top-Heavy Ratio: Determination Date, Valuation Date & Account Adjustments 18.3 Top-Heavy Minimum Contributions (3% Rule), Accelerated Vesting & Safe Harbor Exemption 18.4 Required and Permissive Aggregation Groups & Former Key Employees
19 Chapter 19: Government Reporting & Form 5500 Filings
19.1 Form 5500 Series: Form 5500, Form 5500-SF & Form 5500-EZ Eligibility 19.2 IQPA Independent Audit Threshold: SECURE 2.0 100-Participant Account Balance Rule 19.3 Filing Deadlines, Form 5558 Extensions, EFAST2 Mechanics, DFVC Program & Penalties 19.4 Form 8955-SSA: Reporting Deferred Vested Participants & Related Registration Filings
20 Chapter 20: Participant Disclosures & Statutory Notices
20.1 ERISA Title I Disclosures: SPD, SMM & SAR Timing and Content Requirements 20.2 Fee Disclosures Under ERISA §404(a)(5) & §408(b)(2), Plus Blackout Notices 20.3 Electronic Delivery Safe Harbors (2002 & 2020) & SECURE 2.0 Paper Statement Requirements 20.4 Which Service Providers Must Deliver Fee Disclosures & the Sponsor-Level §408(b)(2) Requirement
21 Chapter 21: ASPPA Professional Conduct & Ethics
21.1 ASPPA Code Overview: Precepts 1 through 6 (Integrity, Competence & Courtesy) 21.2 Conflicts of Interest (Precept 7), Confidentiality (Precept 9) & Work Product Control (Precept 10) 21.3 Professional Discipline, ASPPA Disciplinary Board & Fiduciary Boundary Issues
15.4 Otherwise Excludable Employees: When Disaggregation Rescues a Failing Test
Key Takeaways Explain This Topic AI
IRC §410(b)(4)(B) lets a plan with eligibility more liberal than the statutory maximum split its population into a statutory group and an otherwise excludable group, testing each separately for coverage.
The otherwise excludable group consists of employees who have not attained age 21 or completed one year of service measured under the statutory standard, not under the plan's more generous terms.
Disaggregation almost always helps when HCEs are concentrated in the long-service group and the short-service group is nearly all NHCEs, because the otherwise excludable group then benefits no HCEs and is deemed to pass.
The same disaggregation election is available for ADP and ACP testing, where excluding low-deferring new entrants from the statutory group typically raises the NHCE average deferral percentage.
Last updated: September 2026
A Reward for Generosity
IRC §410(a) lets a plan impose a maximum eligibility condition of age 21 and one year of service . Many sponsors are more generous — immediate entry, or three months, or six months — for recruiting reasons. Without relief, that generosity would be punished: all those short-service, low-deferring NHCEs would flood the testing group and drag down both coverage and the ADP test.
IRC §410(b)(4)(B) supplies the relief. A plan whose eligibility is more liberal than the statutory maximum may be treated as two separate plans :
The statutory group — employees who have met age 21 and one year of service .
The otherwise excludable group — employees who have not met that statutory standard but are eligible under the plan's more generous terms.
Each group is then tested for §410(b) coverage separately , and each must pass on its own.
Critical framing: the split is measured against the statutory standard (age 21, one year), never against the plan's actual terms. A plan with three-month eligibility has an otherwise excludable group consisting of everyone with under one year of service or under age 21.
When Disaggregation Helps
The election is beneficial when the otherwise excludable group contains few or no HCEs . Because a plan benefiting no HCEs is deemed to satisfy coverage , the otherwise excludable "plan" passes automatically, and the statutory group — now free of dozens of non-benefiting or low-deferring short-service NHCEs — is tested on its own, usually with far better numbers.
Worked example — coverage rescued. Harbor Point Design has immediate eligibility and a last-day allocation condition on its profit-sharing contribution.
Combined testing (no disaggregation):
- Group Total Benefiting Benefiting %
- HCEs 6 6 100.0%
- NHCEs 74 46 62.2%
Ratio percentage = 62.2 ÷ 100.0 = 62.2% — fails the 70% ratio percentage test.
After disaggregation. Of the 74 NHCEs, 26 have under one year of service; 8 of those benefit. All 6 HCEs have long service.
Statutory group:
- Group Total Benefiting Benefiting %
- HCEs 6 6 100.0%
- NHCEs 48 38 79.2%
Ratio percentage = 79.2 ÷ 100.0 = 79.2% — passes .
Otherwise excludable group: 0 HCEs, 26 NHCEs, 8 benefiting. The group benefits no HCEs , so it is deemed to pass .
Both disaggregated plans pass. The election converted a failure into a pass without the employer contributing an additional dollar.
When Disaggregation Hurts
The election is not automatically beneficial, and the exam tests the reverse case. Disaggregation backfires when HCEs sit in the otherwise excludable group — most commonly a newly hired owner's child, a recently hired executive, or a new partner.
Counter-example. Suppose Harbor Point hires the owner's daughter, an HCE by attribution, in September. She is in the otherwise excludable group and benefits. That group now has 1 of 1 HCEs benefiting (100%) and 8 of 26 NHCEs benefiting (30.8%) . Ratio percentage = 30.8 ÷ 100.0 = 30.8% — the otherwise excludable group now fails badly , and because each disaggregated plan must pass on its own, the election has manufactured a failure. Testing on a combined basis would have been the better choice.
The administrator's rule: run the test both ways before electing. Disaggregation is an option, not a requirement, and it may be elected or not elected on a year-by-year basis.
The Parallel Benefit in ADP and ACP Testing
The same disaggregation is available for ADP and ACP testing under Treas. Reg. §1.401(k)-1(b)(4)(iv), and this is frequently where it is worth the most. Newly eligible short-service employees defer at very low rates, and every eligible non-deferrer enters the ADP calculation at 0.00% .
Worked example — ADP rescued. Harbor Point's 2026 ADP results:
- Population Count ADP
- HCEs 6 7.10%
- All NHCEs (combined) 74 3.05%
- NHCEs with 1+ year of service 48 4.42%
- NHCEs with under 1 year 26 0.52%
Combined test: NHCE ADP 3.05% → maximum HCE ADP under the 2%-spread rule = 5.05% . The HCE ADP of 7.10% fails , generating refunds.
Disaggregated test: the statutory group's NHCE ADP is 4.42% → maximum HCE ADP = 6.42% . Still short of 7.10%, but the excess is far smaller, so refunds shrink substantially. If the HCE ADP had been 6.20%, disaggregation alone would have converted a failure into a pass.
The otherwise excludable group is tested separately: 0 HCEs eligible in that group means it is deemed to pass .
Rules and Limits on the Election
Rule Detail
Consistency The election must be applied consistently to all employees for the plan year and, where the plan is aggregated with another, across the aggregated plans
Annual choice May be elected or not elected each year; it is not a permanent document commitment in most pre-approved documents
- Each group stands alone Both the statutory and otherwise excludable groups must independently satisfy §410(b)
- Union employees Remain separately disaggregated under the mandatory rules; this election does not change that
- Coverage and ADP are separate elections A plan may disaggregate for ADP/ACP but not coverage, or vice versa
- Age 21 / one year only The split uses the statutory maximum; a plan cannot invent its own dividing line
- Common ASPPA QKA Exam Traps
Trap 1 — Splitting on the plan's own eligibility terms. The otherwise excludable group is defined by the statutory age 21 / one-year standard.
Trap 2 — Assuming the election always helps. If an HCE lands in the otherwise excludable group, it can create a failure.
Trap 3 — Testing only the statutory group. Both disaggregated groups must pass independently.
Trap 4 — Believing it is a permanent election. It is generally an annual testing choice.
Trap 5 — Forgetting the deemed-pass interaction. An otherwise excludable group with no benefiting HCEs passes automatically, which is the whole point of the strategy.
Trap 6 — Overlooking LTPT employees. Long-term part-time employees eligible solely under the 500-hour rule are excluded from coverage, ADP/ACP, and top-heavy testing by statute, which is a separate and additional relief.