17.4 Statutory Deadlines: 2.5-Month Rule, EACA 6-Month Window, §4979 10% Excise Tax & EPCRS Self-Correction

17.4 Statutory Deadlines: 2.5-Month Rule, EACA 6-Month Window, §4979 10% Excise Tax & EPCRS Self-Correction

[!NOTE] The Calendar of Compliance Consequences Performing the mathematical calculations for failed ADP and ACP tests is only half the administrative battle. Qualified retirement plan compliance is strictly anchored to statutory calendars. The Internal Revenue Code establishes a tiered series of deadlines following the close of the plan year, each carrying progressively severe financial and legal consequences.

If an employer acts promptly, testing failures can be corrected with zero corporate tax penalties. If an employer delays, IRC §4979 imposes a mandatory, non-deductible 10% employer excise tax. If the employer ignores the failure beyond the statutory 12-month window, the plan faces catastrophic statutory disqualification under IRC §401(k)(8)(A). Correcting the failure at that late stage under the IRS Employee Plans Compliance Resolution System (EPCRS) completely eliminates the employer's ability to refund money to executives, forcing the company to fund substantial out-of-pocket corrective contributions to rank-and-file workers.

For ASPPA QKA candidates, mastering this statutory timeline—including the 2½-month rule, the 6-month EACA window, Form 5330 reporting, and EPCRS remediation—is an absolute prerequisite for professional credentialing.

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The Tiered Statutory Correction Timetable

The following master architectural timeline outlines the statutory sequence of deadlines for a calendar-year plan ending December 31 (Year 1):

+---------------------------------------------------------------------------------------------------+
|                         STATUTORY ADP/ACP CORRECTION CALENDAR                                     |
+---------------------------------------------------------------------------------------------------+
|                                                                                                   |
|   DECEMBER 31 (YEAR 1): Close of Testing Plan Year                                                |
|         │                                                                                         |
|         ▼                                                                                         |
|   MARCH 15 (YEAR 2): The 2½-Month Statutory Deadline (IRC §4979(f)(1))                            |
|   • Standard deadline to complete corrective distributions to HCEs.                               |
|   • NO EXCISE TAX owed by employer if distributions are completed by this date.                   |
|         │                                                                                         |
|         ├─► [ IF PLAN IS AN EACA UNDER IRC §414(w) ]                                              |
|         │   Deadline extended to JUNE 30 (YEAR 2) (6-Month Window; No Excise Tax).                |
|         │                                                                                         |
|         ▼ (Distributions made after March 15 / June 30, but on or before Dec 31)                  |
|   EMPLOYER 10% EXCISE TAX UNDER IRC §4979 APPLIES!                                                |
|   • Employer must pay 10% excise tax on excess contribution principal.                            |
|   • Reported and paid on IRS FORM 5330.                                                           |
|         │                                                                                         |
|         ▼                                                                                         |
|   DECEMBER 31 (YEAR 2): The Absolute 12-Month Statutory Deadline (IRC §401(k)(8)(A))              |
|   • Last day to correct failed ADP/ACP test via distributions or QNECs under the Code.            |
|   • MISSING THIS DEADLINE = STATUTORY PLAN DISQUALIFICATION!                                      |
|         │                                                                                         |
|         ▼ (Post-12-Month Remediation)                                                             |
|   CORRECTION UNDER EPCRS (Rev. Proc. 2021-30 / SECURE 2.0 §305)                                   |
|   • CORRECTIVE DISTRIBUTIONS TO HCEs ARE STRICTLY PROHIBITED!                                     |
|   • Employer MUST fund 100% QNECs to NHCEs plus investment earnings to pass the test!             |
|                                                                                                   |
+---------------------------------------------------------------------------------------------------+

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Milestone 1: The 2½-Month Rule (IRC §4979)

Under IRC §4979(f)(1) and Treasury Regulation §54.4979-1, an employer can make corrective distributions of excess contributions and excess aggregate contributions without incurring an employer excise tax if the distributions are completed within 2½ months following the close of the plan year.

Operational Rules for the 2½-Month Deadline

• Calendar-Year Plans: For a plan year ending December 31, the 2½-month deadline is exactly March 15 of the following year (or the next business day if March 15 falls on a weekend or legal federal holiday).
• Fiscal-Year Plans: For a non-calendar plan year, the deadline is the 15th day of the third month following the end of the plan year (e.g., September 15 for a plan year ending June 30).
• What Constitutes "Completed": The Treasury regulations dictate that distributions are completed when the refund checks are placed in the United States mail addressed to the participants, or when electronic direct deposits are irrevocably transmitted to the participants' financial institutions. Merely calculating the numbers or generating an internal report by March 15 does not satisfy the deadline.

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Milestone 2: The EACA 6-Month Window: IRC §4979(f)(1)

Under the Pension Protection Act of 2006 (PPA 2006), Congress enacted IRC §4979(f)(1) to provide relief to employers that promote retirement savings through automatic enrollment. If a plan contains an Eligible Automatic Contribution Arrangement (EACA) under IRC §414(w), the 2½-month correction window is extended to 6 months!

Statutory EACA Requirements

For a calendar-year plan, this extension moves the deadline from March 15 to June 30. An employer maintaining an EACA can make corrective distributions of excess contributions all the way through June 30 without owing a single penny of the 10% excise tax.

However, to qualify for the 6-month extension, the plan must satisfy the strict operational standards of IRC §414(w):

1. Uniformity and Coverage: The automatic enrollment feature must cover all eligible employees who have not affirmatively elected otherwise (or all newly eligible employees);
2. Permissible Withdrawal Feature: Participants must be permitted to elect out and withdraw their automatic deferrals within 30 to 90 days after their first payroll deduction; and
3. Mandatory Annual Notice: All eligible participants must receive a comprehensive annual EACA notice explaining their rights and default contribution rates within a reasonable period (30 to 90 days) before the beginning of each plan year.

[!WARNING] The QACA vs. EACA Confusion: A classic ASPPA QKA exam trap involves a plan with a Qualified Automatic Contribution Arrangement (QACA) safe harbor that failed coverage or had discretionary matching that failed ACP testing. If a plan has an automatic contribution arrangement (ACA) or QACA that does NOT meet all specific statutory EACA notice and withdrawal requirements under IRC §414(w), it does not qualify for the 6-month window! In the absence of full EACA compliance, the deadline remains March 15.

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Milestone 3: The 10% Employer Excise Tax & Form 5330

If corrective distributions of excess contributions or excess aggregate contributions are completed after the 2½-month deadline (or after June 30 for an EACA) but on or before the 12-month deadline, the plan remains qualified, but the employer is penalized under IRC §4979.

Calculating the Excise Tax Base

Under IRC §4979(a), the tax is equal to 10% of the sum of Excess Contributions and Excess Aggregate Contributions.

[!IMPORTANT] Exclusion of Net Income Attributable (NIA): One of the most frequently tested mathematical nuances on the ASPPA QKA examination is that the 10% excise tax is assessed strictly on the principal amount of excess contributions and excess aggregate contributions! Net Income Attributable (earnings) is EXCLUDED from the excise tax calculation.

$\text{IRC Section 4979 Excise Tax} = 10\% \times \text{Total Excess Contribution Principal (Excluding Earnings)}$

• Example: An employer corrects a failed 2025 ADP test on May 10, 2026 (after March 15, non-EACA). The corrective distribution consists of $30,000 of excess contribution principal and $3,000 of allocable investment earnings (NIA), for a total distribution of $33,000.
• The 10% excise tax owed by the employer is: $\text{Excise Tax} = 10\% \times \$30,000 = \mathbf{\$3,000.00}$ (The $3,000 of earnings is completely excluded from the tax base!).

Liability and Form 5330 Reporting

• Liability: The tax is imposed on the EMPLOYER, not the plan, and not the participants. The employer cannot deduct this tax from participant accounts or pay it out of plan trust assets. Doing so constitutes a prohibited transaction and a breach of ERISA fiduciary duties under ERISA §404(a) and IRC §4975.
• Non-Deductibility: The 10% excise tax is a corporate tax penalty and is not tax-deductible as an ordinary business expense under IRC §275(a)(6).
• Filing Form 5330: The tax must be formally reported and remitted to the IRS on IRS Form 5330 (Return of Excise Taxes Related to Employee Benefit Plans), Part VI.
• Form 5330 Filing Deadline: Under Treas. Reg. §54.6072-1, Form 5330 for §4979 excise tax must be filed and taxes paid by the last day of the 15th month following the close of the plan year to which the excess contributions relate (e.g., March 31, 2027, for a calendar-year plan ending December 31, 2025).

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Milestone 4: The 12-Month Statutory Deadline (Plan Disqualification)

Under IRC §401(k)(8)(A) and IRC §401(m)(6)(A), the absolute statutory deadline for correcting a failed ADP or ACP test is the last day of the 12-month period following the close of the plan year being tested:

• For a calendar-year plan ending December 31 (Year 1), the 12-month deadline is December 31 of Year 2.

The Catastrophic Legal Effect of Missing 12 Months

If an employer fails to complete corrective distributions, allocate QNECs/QMACs, or recharacterize catch-up contributions by the close of the 12-month period:

1. The 401(k) Cash or Deferred Arrangement Loses Its Qualification: Under IRC §401(k)(1) and (k)(8), the CODA fails to be a qualified arrangement for the plan year in which the excess occurred and all subsequent years that the failure remains uncorrected.
2. Total Plan Disqualification Under IRC §401(a): Because the CODA is non-qualified, the entire plan fails qualification under IRC §401(a)(4) for discriminating in favor of HCEs.
3. Loss of Tax-Exempt Status Under IRC §501(a): The plan's underlying trust becomes a taxable entity. The trust must file Form 1041 and pay federal income taxes on all trust investment earnings from the beginning of the disqualified year forward.
4. Disallowance of Employer Deductions Under IRC §404: Employer matching and nonelective contributions made for that year are no longer deductible under qualified plan rules, resulting in corporate income tax deficiencies, back taxes, and penalties.
5. Immediate Taxation of Participants Under IRC §402(b):
   • HCEs: Under IRC §402(b)(4), all Highly Compensated Employees are taxed immediately on the entire fair market value of their vested accrued account balances as ordinary income, regardless of whether any funds were distributed!
   • NHCEs: Rank-and-file employees are generally shielded from immediate taxation unless the plan was disqualified for violating minimum coverage rules.

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Correction Under EPCRS: Rev. Proc. 2021-30 & SECURE 2.0 §305

When a plan administrator discovers after the 12-month statutory deadline has passed that an ADP or ACP test failed and was never corrected, the plan cannot simply issue late refund checks to HCEs. The statutory window under IRC §401(k)(8) has slammed shut.

To restore qualified status, the employer must utilize the IRS Employee Plans Compliance Resolution System (EPCRS), codified in Revenue Procedure 2021-30 and expanded by SECURE 2.0 Section 305 (expanding the Self-Correction Program for eligible inadvertent failures).

The Golden Rule of EPCRS ADP/ACP Correction

+---------------------------------------------------------------------------------------------------+
|              CRITICAL EPCRS REVISION: POST-12-MONTH REMEDIATION PROTOCOL                          |
+---------------------------------------------------------------------------------------------------+
|                                                                                                   |
|   ONCE THE 12-MONTH STATUTORY CORRECTION WINDOW EXPIRES:                                          |
|                                                                                                   |
|   CORRECTIVE DISTRIBUTIONS TO HCEs ARE STRICTLY PROHIBITED!                                       |
|                                                                                                   |
|   • The IRS does not allow an employer to fix a multi-year qualification defect by returning      |
|     money to executives.                                                                          |
|                                                                                                   |
|   • THE SOLE PERMISSIBLE METHOD UNDER EPCRS:                                                      |
|     The employer MUST fund ONE HUNDRED PERCENT (100%) EMPLOYER QNECs to eligible Non-Highly        |
|     Compensated Employees (NHCEs) to raise the NHCE ADP/ACP to the exact level needed to PASS!     |
|                                                                                                   |
|   • MANDATORY EARNINGS ADJUSTMENT:                                                                |
|     The corrective QNECs must be adjusted for investment earnings (or losses) from the last day   |
|     of the testing plan year through the actual date the QNEC is deposited into the trust!       |
|                                                                                                   |
+---------------------------------------------------------------------------------------------------+

The Financial Catastrophe for Plan Sponsors

Consider the operational impact of missing the 12-month deadline:

• Within 12 Months: An employer that failed the ADP test by $20,000 could simply refund $20,000 of deferrals to its executives (or pay a $2,000 excise tax if after March 15). The employer pays virtually $0 out of pocket for the correction itself.
• After 12 Months Under EPCRS: Corrective refunds are illegal. The employer must write a corporate check out of company funds to make a $20,000+ QNEC contribution to rank-and-file workers, plus accumulated investment earnings!

This dramatic contrast is tested relentlessly on the ASPPA QKA examination to ensure administrators never allow the 12-month statutory deadline to lapse.

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Master Statutory Timeline Summary Table

The following table synthesizes the full chronological continuum of statutory deadlines and consequences for a calendar-year plan:

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Common ASPPA QKA Exam Traps

• Exam Trap 1: Attempting Corrective Distributions After 12 Months: An exam question describes a failed ADP test discovered 14 months after the close of the plan year and asks what action the administrator should take under EPCRS. Options will include "Issue corrective distributions to HCEs with Form 1099-R Code E." This is completely wrong! Distributions to HCEs are strictly barred after 12 months under EPCRS; the employer must fund 100% QNECs to NHCEs.
• Exam Trap 2: Calculating Excise Tax on Investment Earnings (NIA): A question asks for the IRC §4979 excise tax due on a late corrective distribution of $20,000 excess contributions and $4,000 NIA. Candidates calculate 10% of $24,000 ($2,400). The excise tax is assessed solely on the $20,000 principal ($2,000). NIA is excluded from the excise tax base.
• Exam Trap 3: Assuming All Automatic Enrollment Plans Get 6 Months: A question states that a plan has a Qualified Automatic Contribution Arrangement (QACA) safe harbor that failed ACP testing on discretionary match, but did not provide the EACA 90-day withdrawal window. Candidates choose June 30 as the penalty-free deadline. Only EACAs that comply fully with IRC §414(w) receive the 6-month extension. Without full EACA compliance, the deadline is March 15.
• Exam Trap 4: Deducting the 10% Excise Tax from HCE Accounts: A question asks who pays the 10% excise tax under IRC §4979. Candidates sometimes state that the excise tax is deducted from the HCE's refund check. The excise tax is an employer tax penalty, paid entirely out of corporate funds via Form 5330, and is non-deductible.
• Exam Trap 5: Assuming QNECs Made Within 12 Months Trigger the 10% Excise Tax: An employer funds a QNEC on November 15 (11 months after plan year end) to pass the ADP test. Does the employer owe the 10% excise tax under IRC §4979? NO! Section 4979 imposes an excise tax on excess contributions that are distributed late. Because the QNEC eliminated the failure before the 12-month mark, there are no uncorrected excess contributions, and no §4979 excise tax is owed!