
Break in service rules 401k can be a bit confusing, but essentially, they dictate how long you can be away from your job before losing your employer matching contributions.
The general rule is that you can be away from your job for 12 months or more without losing your employer matching contributions.
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Break in Service Rules
A break in service can have significant implications for your 401k benefits. If you leave your job and return within 13 weeks, you'll be considered a rehired employee, not a new hire.
This distinction is important because rehires must be provided healthcare coverage immediately, as they've already qualified for certain benefits during their prior employment.
Employers can designate someone rehired beyond 13 weeks as a new hire, who must start from scratch and work a designated period before benefits kick in.
Leaving your job for too long can result in cancellation of your previously earned Pension Credit and Years of Vesting Service.
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Service Interruptions
A break in service can have significant implications for your 401k benefits. If you've had a break in service of less than 13 weeks, you'll be considered a rehired employee, whereas a break in service longer than 13 weeks will be considered a new hire.
This distinction is important because rehires are entitled to certain benefits immediately, whereas new hires must start from scratch and work a designated period before benefits kick in.
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Rehired Employees
Rehired employees who previously had a break in service may be eligible to have their 401(k) plan reinstated, but only if they meet the plan's requirements.
If an employee is rehired within 12 months of their previous termination, their break in service is not considered a break in service for 401(k) purposes.
Rehired employees who were previously vested in the plan are generally entitled to have their previous contributions reinstated, but only if they meet the plan's requirements.
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Rehired employees who were not previously vested in the plan may not be entitled to have their previous contributions reinstated, even if they meet the plan's requirements.
In some cases, rehire employees may be able to purchase service credit for their previous break in service, but this is not always possible.
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Facts and Application
A break in service is generally a 12-month plan year during which the employee works fewer than 501 hours. This is about 3 months for a full-time employee, depending on when in the year they initially terminated.
To be considered a participant in a plan, an employee only needs to have satisfied the eligibility requirements, even if they're not actively contributing or receiving benefits. This means they can be a participant even if they're not actively working or contributing to the plan.
The IRS defines a full-time employee as someone who works at least 130 hours per month, or 30 hours per week. If an employer uses the Monthly Measurement Method, a past employee who worked full-time and satisfied a past waiting period will have benefits reinstated from day one.
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Here's a quick rundown of the break in service requirements:
- 12-month plan year
- Employee works fewer than 501 hours
If an employer applies the "rule of parity", they can treat a rehired employee as a new hire if the break in service is longer than the period worked prior to leaving.
Special Considerations
To be considered a full-time employee, a person must work at least 130 hours per month or 30 hours per week. This is a key factor in applying the rehire rule.
If an employer defines a past employee as full-time using the Monthly Measurement Method, and they satisfied a past waiting period, benefits must be reinstated from day one.
A returning employee who is deemed a new hire, however, can be treated like any other new hire and must work for a determined period before being eligible for benefits.
The ACA allows an employer to apply a "rule of parity", which means they can treat a rehired employee as a new hire if the break in service is longer than the period worked prior to leaving.
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[Facts]

A rehired employee's service prior to her previous date of termination can be disregarded if all three requirements are met. This rule is a straightforward guideline for employers to follow.
The first requirement is that the employee was a participant in the plan during her previous employment. Being an employee is considered a participant if she has satisfied the eligibility requirements, even if she's not actively contributing or receiving benefits.
If an employee deferred at all during her first tenure, she's automatically 100% vested, which blows this requirement. The same is true if she received any safe harbor contributions.
A break in service is generally a 12-month plan year during which the employee works fewer than 501 hours. This is about 3 months for a full-time employee, depending on when in the year she initially terminated.
Here's a quick rundown of the requirements:
- The employee was a participant in the plan during her previous employment.
- She was 0% vested in all contribution sources at the time of termination.
- The employee had a break in service of at least 12 months.
The IRS defines a full-time employee as someone who works at least 130 hours per month, or 30 hours per week.
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Frequently Asked Questions
What is the 5 year break-in service rule for eligibility?
To be eligible, you must return to work within 5 consecutive years after a break in service, or your prior service will not count towards vesting. If you exceed the 5-year limit, you'll need to meet other requirements to qualify.
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