4.3 Breaks in Service, Re-Employment Rules & Service Re-Crediting

4.3 Breaks in Service, Re-Employment Rules & Service Re-Crediting

[!NOTE] Core Regulatory Standard: Employee careers rarely follow an uninterrupted path. Employees take maternity and paternity leaves, suffer layoffs, resign for personal reasons, and are subsequently rehired years later. Under Internal Revenue Code (IRC) §410(a)(5) and §411(a)(6), qualified retirement plans must establish rigorous statutory mechanisms to measure interruptions in employment—known as Breaks in Service—and determine when an employee's pre-break service must be restored upon rehire. While the baseline rule under IRC §410(a)(5)(A) mandates that all years of service with the employer must be aggregated, the statute provides narrow, heavily tested exceptions where prior service may be temporarily suspended or permanently forfeited.

Navigating break-in-service and rehire compliance requires absolute mathematical precision. A Qualified 401(k) Administrator must correctly differentiate between a Year of Service, a Break in Service, and a 'neutral year,' while seamlessly executing statutory rehire entry rules to avoid improper exclusion claims under ERISA.

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Defining a 1-Year Break in Service: The Three Zones of Service

Under IRC §411(a)(6)(A) and Department of Labor Regulation §2530.200b-4, a 1-Year Break in Service is defined as a 12-consecutive-month computation period during which the employee is credited with 500 or fewer hours of service.

To visualize how service hours impact an employee's status in any given computation period, retirement plan administrators utilize the Three Zones of Service framework:

                          The Three Zones of Annual Service Crediting

  0 Hours                         500 Hours                     1,000 Hours
    ├─────────────────────────────────┼──────────────────────────────┼─────────────────────────►
    │                                 │                              │
    │            ZONE 3               │            ZONE 2            │         ZONE 1
    │     1-YEAR BREAK IN SERVICE     │         NEUTRAL YEAR         │     YEAR OF SERVICE
    │        (<= 500 Hours)           │       (501 - 999 Hours)      │     (>= 1,000 Hours)
    │                                 │                              │
    │ • Triggers break counters       │ • NO Year of Service earned  │ • Earns 1 Year of Service
    │ • May activate Rule of Parity   │ • NO Break in Service occurs │ • Counts for eligibility
    │ • May trigger One-Year Holdout  │ • Employee status frozen     │ • Counts for vesting

1. Zone 1: Year of Service (1,000+ Hours)

If an employee completes at least 1,000 hours of service in the computation period, they earn a full Year of Service for eligibility and vesting purposes.

2. Zone 2: The Neutral Year (501 to 999 Hours)

If an employee completes between 501 and 999 hours of service, they occupy the 'neutral zone':

• The employee does NOT earn a Year of Service (because they failed to reach 1,000 hours);
• But the employee does NOT incur a Break in Service (because they worked more than 500 hours)!
• Administrative Impact: The employee's record is completely protected. Any running counter of consecutive breaks in service is halted, and prior service cannot be forfeited.

3. Zone 3: 1-Year Break in Service (500 or Fewer Hours)

If an employee completes 500 or fewer hours of service (including 0 hours) during the applicable 12-month computation period, they incur a statutory 1-Year Break in Service.

Equivalency Method Break Thresholds

When a plan document defines service using regulatory equivalencies under DOL Reg. §2530.200b-3, the 500-hour break-in-service threshold adjusts accordingly:

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Maternity and Paternity Leave Crediting (IRC §410(a)(5)(E) & §411(a)(6)(E))

Congress recognized that parental leaves could cause employees (disproportionately women) to suffer breaks in service that wipe out prior pension vesting or eligibility. To prevent this inequity, the Retirement Equity Act of 1984 (REA) added IRC §410(a)(5)(E) and §411(a)(6)(E).

Qualifying Parental Leave Reasons

Special service crediting applies to an employee absent from work by reason of:

1. The pregnancy of the employee;
2. The birth of a child of the employee;
3. The placement of a child with the employee in connection with adoption; or
4. Caring for such child for a period beginning immediately following such birth or placement.

+-------------------------------------------------------------------------------+
|           Maternity and Paternity Leave Service Crediting Rules               |
+-------------------------------------------------------------------------------+
|  Statutory Cap:        Up to 501 Hours of Service                             |
|  Sole Legal Purpose:   SOLELY to Prevent a 1-Year Break in Service            |
|  Strict Limitation:    CANNOT be used to earn a Year of Service!              |
|  Compensation Status:  Applies to both PAID and UNPAID parental leaves        |
+-------------------------------------------------------------------------------+

Mechanics of Crediting the 501 Hours

• Hours Credited: The plan must credit the hours that would normally have been credited but for the absence (or, if unknown, 8 hours per day of absence), up to a maximum of 501 hours.
• Break Prevention Only: The 501 hours are credited for the sole purpose of avoiding a 1-Year Break in Service. Because 501 hours exceeds the 500-hour break threshold by exactly one hour, the employee is pushed into the 'neutral zone' (Zone 2).
• No Year of Service Accrual: These hours cannot be added to actual hours to push an employee over 1,000 hours to earn a Year of Service for eligibility or vesting.
• Which Computation Period Receives the Hours?:
  1. The hours are credited in the computation period in which the absence begins if crediting is necessary to prevent a break in service in that period;
  2. If the employee already had more than 500 hours in that first computation period (and therefore did not need them to prevent a break), the hours are credited in the immediately following computation period.

Example: Jessica works 750 hours in 2024 before taking an unpaid 6-month maternity leave extending into 2025. In 2024, Jessica does not need maternity hours because 750 hours already prevents a break. In 2025, Jessica works only 200 hours after returning. The plan must credit 301 maternity hours to 2025 (200 + 301 = 501 hours), moving Jessica into the neutral zone and preventing a 2025 break in service!

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The General Rule of Service Aggregation (IRC §410(a)(5)(A))

Under IRC §410(a)(5)(A), the overarching baseline rule is that all years of service with the employer maintaining the plan must be taken into account in computing the period of service for eligibility and vesting.

When an employee terminates and is subsequently rehired, their prior service is presumed preserved. Prior service may be disregarded only if the employer's plan document explicitly incorporates one of three statutory break-in-service exceptions:

1. The One-Year Holdout Rule (IRC §410(a)(5)(C));
2. The Rule of Parity for non-vested participants (IRC §410(a)(5)(D)); or
3. The Two-Year 100% Vesting Break Rule (IRC §410(a)(5)(B)).

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The One-Year Holdout Rule (IRC §410(a)(5)(C) & §411(a)(6)(B))

Under the One-Year Holdout Rule, a plan document may specify that if an employee incurs a 1-Year Break in Service, the employee's pre-break service is temporarily suspended upon rehire until the employee completes one Year of Service (1,000 hours in 12 months) after their re-employment date.

                             The One-Year Holdout Architecture

  Rehire Date                 Holdout Period (12 Months)             1,000th Hour Earned
       │                                   │                                  │
       ├───────────────────────────────────┴──────────────────────────────────┤
       │                                                                      │
       ▼                                                                      ▼
  Employee is "held out"                                       Pre-break service is RESTORED
  Treated as ineligible.                                       RETROACTIVELY to Rehire Date!
  No deferrals withheld.                                       Retroactive plan entry triggered.

The Operational Trap: The Retroactive Snap-Back

While the One-Year Holdout Rule sounds appealing to employers who want to avoid enrolling short-term rehires, it creates a massive administrative nightmare for 401(k) plans:

[!CAUTION] The Administrative Hazard of the One-Year Holdout Rule: Under Treasury Regulation §1.410(a)-5(c)(3), once the rehired employee completes that 1,000th hour during the 12 months following rehire, their pre-break service is restored retroactively to their exact rehire date.

In a 401(k) plan, this means the employee was technically eligible to make elective deferrals during that entire holdout year! Because the employer failed to withhold deferrals, an operational failure occurs under EPCRS. The employer must fund a corrective Qualified Nonelective Contribution (QNEC) for the missed deferral opportunity, plus 100% of missed matching contributions, adjusted for lost earnings! Consequently, modern 401(k) plans almost NEVER adopt the One-Year Holdout Rule; they utilize immediate re-entry instead.

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The Rule of Parity (IRC §410(a)(5)(D) & §411(a)(6)(D))

The Rule of Parity allows an employer to permanently wipe out an employee's prior pre-break service, but the rule is severely restricted by statutory consumer protections.

The Two Mandatory Pre-Conditions

For the Rule of Parity to extinguish prior service, two statutory conditions must be satisfied:

+-------------------------------------------------------------------------------+
|                   The Two Pre-Conditions for the Rule of Parity               |
+-------------------------------------------------------------------------------+
|  Condition 1:  The participant must be NON-VESTED (0% vested in employer      |
|                contributions) at the time of severance.                       |
|                                                                               |
|  Condition 2:  Consecutive 1-Year Breaks in Service must EQUAL OR EXCEED:     |
|                THE GREATER OF:                                                |
|                (a) 5 Consecutive 1-Year Breaks in Service; OR                 |
|                (b) The Aggregate Number of Pre-Break Years of Service.        |
+-------------------------------------------------------------------------------+

1. Condition 1: 0% Vested Interest Required

The Rule of Parity can never be applied against an employee who has any vested interest in employer contributions:

• If an employee is even 1% vested (or 20%, 40%, 60%) in an employer match or profit-sharing account at the time of termination, their prior service is permanently protected! Their pre-break service can never be wiped out under the Rule of Parity, regardless of how many consecutive breaks they incur.
• Furthermore, participant elective deferrals are always 100% immediately vested. However, under Treasury regulations, having a 100% vested salary deferral account does not prevent the forfeiture of prior service for employer non-elective vesting purposes if the employee was 0% vested in employer contributions.

2. Condition 2: The 'Greater of 5 or Pre-Break Service' Standard

Prior to the Retirement Equity Act of 1984, the Rule of Parity allowed forfeiture if consecutive breaks simply equaled pre-break service (e.g., 1 year of service wiped out by 1 break). REA established a mandatory 5-year statutory floor:

• An employee must incur at least 5 consecutive 1-Year Breaks in Service before parity forfeiture can occur.

Detailed Rule of Parity Worked Examples

Scenario A: 2 Years of Service, 4 Breaks

• Employee: Kevin (0% vested at termination).
• Pre-Break Years of Service: 2 Years.
• Consecutive 1-Year Breaks: 4 Breaks.
• Parity Benchmark: Greater of 5 or 2 = 5 Breaks.
• Evaluation: Kevin incurred 4 breaks, which is less than the benchmark of 5.
• Outcome: NO FORFEITURE. Kevin's 2 years of prior service are fully preserved and re-credited upon rehire!

Scenario B: 3 Years of Service, 5 Breaks

• Employee: Laura (0% vested at termination).
• Pre-Break Years of Service: 3 Years.
• Consecutive 1-Year Breaks: 5 Breaks.
• Parity Benchmark: Greater of 5 or 3 = 5 Breaks.
• Evaluation: Laura incurred 5 breaks, which equals the benchmark of 5.
• Outcome: PERMANENT FORFEITURE. Laura's 3 years of prior service are completely extinguished. Upon rehire, she is treated as a brand-new employee.

Scenario C: 7 Years of Service, 6 Breaks

• Employee: Michael (0% vested in a defined benefit formula).
• Pre-Break Years of Service: 7 Years.
• Consecutive 1-Year Breaks: 6 Breaks.
• Parity Benchmark: Greater of 5 or 7 = 7 Breaks.
• Evaluation: Michael incurred 6 breaks, which is less than the benchmark of 7.
• Outcome: NO FORFEITURE. Michael's 7 years of prior service are preserved!

Scenario D: 2 Years of Service, 8 Breaks, 20% Vested

• Employee: Samantha (20% vested under a 6-year graded schedule).
• Pre-Break Years of Service: 2 Years.
• Consecutive 1-Year Breaks: 8 Breaks.
• Parity Benchmark: Inapplicable!
• Evaluation: Samantha had a vested interest (20%) at separation.
• Outcome: NO FORFEITURE. Because Samantha was partially vested, the Rule of Parity cannot apply. All prior service is preserved!

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The Two-Year 100% Vesting Break Rule (IRC §410(a)(5)(B))

Under IRC §410(a)(1)(B)(i), an employer may require an employee to complete up to two years of service for participation in an employer profit-sharing or defined benefit plan, provided the plan grants 100% immediate vesting upon entry.

To accommodate this design, IRC §410(a)(5)(B) provides a specialized break rule:

The Two-Year Vesting Break Rule: In a plan that requires 2 years of service with 100% immediate vesting, if an employee completes 1 year of service and then incurs a 1-Year Break in Service before completing the second year of service, the plan may permanently disregard the first year of service!

The employee loses that initial year and must restart the 2-year eligibility requirement from scratch upon rehire.

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Plan Entry Timing Upon Rehire: Comprehensive Matrix

When a rehired employee returns to work, determining the exact date they can resume plan participation depends on their status at the time of termination:

                               Rehire Participation Decision Tree
                                                │
                 ┌──────────────────────────────┴──────────────────────────────┐
                 ▼                                                             ▼
     [Prior Active Participant]                                  [Terminated Prior to Plan Entry]
                 │                                                             │
                 ▼                                                             ▼
       Did employee incur a                                         Did employee satisfy Age & Service
       disqualifying break?                                         before terminating?
        /              \                                             /              \
       NO              YES                                          YES              NO
       │                │                                           │                │
       ▼                ▼                                           ▼                ▼
   IMMEDIATE       Apply Rule of Parity                         Rehire Date vs.   Must complete
    ENTRY          or One-Year Holdout                          Entry Date        remaining service
   on Rehire Date  (If forfeited, new hire)                     Comparison        under ECP rules

The Operational Rehire Matrix

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Comprehensive Worked Rehire Scenario

Plan Design: Calendar-year 401(k) plan. Eligibility: Age 21 and 1 Year of Service (1,000 hours). Semi-annual entry dates (January 1 and July 1). Plan does not use One-Year Holdout; uses standard Rule of Parity.

Employee Profile: Brandon (Age 26 at hire):

• January 1, 2021: Hired by company.
• 2021 Plan Year: Brandon works 1,200 hours. Satisfies Age 21 and 1 YOS on December 31, 2021.
• January 1, 2022: Brandon enters the plan as an active participant.
• June 30, 2022: Brandon resigns to pursue another opportunity. In 2022, he worked 600 hours (Zone 2 — neutral year; no break).
• 2023 Plan Year: Brandon performs 0 hours of service. (Break in Service 1).
• 2024 Plan Year: Brandon performs 0 hours of service. (Break in Service 2).
• April 15, 2025: Brandon is rehired by the company.

Step-by-Step Administrative Evaluation:

1. Evaluate Breaks in Service: Brandon incurred 2 consecutive 1-Year Breaks in Service (2023 and 2024).
2. Evaluate Rule of Parity: Brandon had 1 Year of Service prior to severance. The parity benchmark is the greater of 5 or 1 = 5 breaks. Brandon incurred only 2 breaks (2 < 5). Therefore, Brandon's prior service and participant status are not forfeited!
3. Determine Re-Entry Date: Because Brandon was an active participant prior to severance and his prior service is intact, Brandon enters the plan immediately on his rehire date: April 15, 2025.
4. Operational Execution: Payroll must provide Brandon with a salary reduction agreement and summary plan description immediately, allowing him to defer from his first paycheck following April 15, 2025.

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Critical Exam Traps & Administrative Gotchas

[!CAUTION] Key Exam Traps on Breaks in Service and Rehire:

1. 501 Hours Is Not a Break: A candidate who sees 501 hours on an exam question must immediately identify it as a 'neutral year.' It does not count for a Year of Service, but it completely blocks a 1-Year Break in Service.
2. Maternity Hours Do Not Earn a Year of Service: The up-to-501 hours credited for maternity/paternity leave can never be combined with worked hours to grant a Year of Service for eligibility or vesting. Its statutory power is limited strictly to break prevention.
3. Rule of Parity Floor of 5: Never forfeit prior service under the Rule of Parity unless the employee has at least 5 consecutive 1-Year Breaks in Service, regardless of how short their pre-break tenure was.
4. Partial Vesting Blocks Parity Forever: If an employee has even a 1% vested interest in employer contributions, the Rule of Parity can never be used to forfeit their service.