Designing Eligibility Criteria for Benefit Classes (2026)

Designing eligibility criteria for benefit classes requires a structured approach. To do it correctly, you must first segment your workforce into legally permitted groups (like full-time vs. part-time), then define specific rules for each group (such as waiting periods and contribution amounts), and finally, ensure the entire framework complies with federal regulations. This process is how you define who gets what benefits, allowing you to control costs, ensure fairness, and stay compliant, especially when implementing flexible options like an Individual Coverage HRA (ICHRA).

Getting this right from the start prevents major headaches down the road. This guide breaks down these essential components, from defining employee classes to navigating complex compliance rules, helping you build a smarter, more effective benefits strategy.

The Building Blocks: Understanding Employee Classes

Before you can set rules, you need to know your groups. An employee class is simply a specific group of employees defined by legitimate job based criteria. When designing eligibility criteria for benefit classes, particularly for ICHRAs, you must use one of the officially permitted classifications.

Full Time vs. Part Time Employees

This is the most common way to segment a workforce. A class can be based on the average hours an employee works. Under federal rules, you have some flexibility in your definitions, but consistency is key.

• For Affordable Care Act (ACA) purposes, “full time” is generally defined as working an average of 30 or more hours per week, or 130 hours in a month.
• ICHRA regulations allow employers to use the definition from either the ACA (§4980H) or a different section of the tax code (§105(h)), as long as it’s applied consistently for full time, part time, and seasonal classes within the same plan year.
• If you offer a traditional group plan to one class (like full time) and an ICHRA to another (like part time), a minimum class size rule may apply to the ICHRA group.

Salaried vs. Hourly Employees

Another straightforward and permitted method for creating benefit classes is based on how employees are paid. You can create one class for salaried employees and another for non salaried (or hourly) workers. This is a popular strategy for companies with distinct operational and administrative staff. The same terms must apply to everyone within a given class, though ICHRA allowances can still vary based on age and family size.

Seasonal Employees

A seasonal employee is someone hired for a position that customarily lasts six months or less each year. This is a distinct, permitted ICHRA class that provides flexibility for businesses with fluctuating labor needs, like retail or agriculture. The minimum class size rules that can apply to full time or salaried classes typically do not apply to a seasonal employee class when offered an ICHRA.

Union Employees

Employees covered by a collective bargaining agreement (CBA) can be placed in their own separate benefit class. This is a standard practice, as health benefits are often a subject of good faith bargaining during union negotiations. You can offer this class a different set of benefits, including an ICHRA, separate from your non union workforce.

Geographic Location

For companies with a distributed workforce, designing eligibility criteria for benefit classes based on location is a powerful tool. You can create classes for employees whose primary worksite is in the same insurance rating area. This is incredibly useful because health insurance premiums can vary dramatically from one county or state to another. This approach allows you to set different ICHRA allowance amounts that reflect local healthcare costs.

Key Eligibility Criteria to Define for Your Benefit Classes

Once you’ve established your classes, the next step is designing eligibility criteria for benefit classes that are clear, compliant, and easy to administer.

Minimum Age and Length of Service

While you might be used to setting age or service requirements for benefits, the rules are very specific.

• Minimum Age: For ICHRAs, you generally cannot exclude employees based on age. The law does not list age as a permitted class.
• Length of Service: For group health plans, including ICHRAs, you cannot impose a waiting period longer than 90 days before an employee becomes eligible for coverage. A one month orientation period (also called an administrative period) is also permitted before the 90 day clock starts.

Standard Hour Thresholds and Waiting Periods

These two criteria work together to define when coverage officially begins.

• Standard Hour Threshold: This is the hours benchmark you use to define eligibility, often aligning with the ACA’s 30 hour per week rule for full time status.
• Waiting Periods: Employees who have not yet satisfied a compliant waiting period (not to exceed 90 days) can be treated as their own distinct ICHRA class. This helps simplify administration while new hires are in their initial eligibility window.

Defining Dependent Eligibility

You have the flexibility to decide whether your benefits will extend to an employee’s family. Within a class, you can design an ICHRA that covers only the employee or one that also provides allowances for a spouse and children.

• ICHRA rules specifically permit varying the reimbursement amount based on the number of dependents covered.
• For ACA purposes, a dependent is a child up to age 26. Group plans offering dependent coverage must make it available to children until they reach this age.

Setting Your Contribution Strategy

Your contribution strategy is the heart of your benefit design. For each class, you’ll determine how much the company will contribute toward health coverage. With an ICHRA, this takes the form of a monthly reimbursement allowance.

A core principle is the “same terms” rule, which requires you to offer the same allowance to all employees within the same class. However, there are two crucial exceptions:

1. Age: You can vary allowances by employee age, as long as the amount for the oldest employee is no more than three times the amount for the youngest.
2. Family Size: You can offer different allowance amounts for employee only, employee plus one, or family coverage. To help ensure offers remain affordable under the ACA, review the affordability safe harbors.

See how SimplyHRA helps you model and manage contribution strategies for every employee class.

A Note on Carrier and Stop Loss Approval

This consideration primarily applies if you also maintain a self funded traditional health plan for certain employee classes. Stop loss insurance, which protects your company from catastrophic claims, is underwritten based on your plan’s specific terms. Any claims paid for ineligible employees could be denied by your stop loss carrier, making it critical that your plan documents and eligibility rules are perfectly aligned.

Compliance Guardrails for Your Class Based Benefits

Successfully designing eligibility criteria for benefit classes hinges on navigating a web of federal regulations. Getting this wrong can lead to costly penalties and taxable benefits for your key employees.

Nondiscrimination Testing (Section 125 and 105(h))

Two major compliance frameworks exist to ensure your benefits do not unfairly favor highly compensated individuals (HCIs) or key employees.

• Section 125 (Cafeteria Plans): If you allow employees to pay for their portion of premiums with pre tax money, your plan must pass nondiscrimination tests for eligibility, benefits, and contributions.
• Section 105(h) (Self Insured Plans): Since HRAs are self insured plans, they are subject to these rules. The plan cannot discriminate in favor of HCIs regarding eligibility or the benefits provided. Fortunately, the government has clarified that an ICHRA that follows the “same terms” rule (with permitted age and family size variations) will not, by itself, be considered discriminatory.

What About Fully Insured Plans? (PHSA §2716)

The ACA technically extended nondiscrimination rules similar to Section 105(h) to fully insured group health plans. However, the IRS has indefinitely delayed the enforcement of these rules until final regulations are issued. While you should still prioritize equity, the strict federal testing requirements are not currently in effect for insured plans.

Nailing Down Effective Dates and Reference Dates

Timing is everything. You must have a clear policy for when eligibility is determined and when coverage starts.

• Eligibility Effective Date: This rule defines when an employee can start using their benefits. For ICHRAs, this must align with the start date of their individual health plan, which they can enroll in during a Special Enrollment Period triggered by the new ICHRA offer.
• Eligibility Reference Date: This is the date you use to start the clock on waiting periods. It could be the employee’s date of hire, the date they achieve full time status, or a specific date you set for a class.

Special ICHRA Rules: The New Hire Provision & Minimum Class Size

ICHRAs have two unique rules that add powerful flexibility but require careful attention when designing eligibility criteria for benefit classes.

• The New Hire Provision: This allows you to grandfather existing employees in a traditional group plan while offering an ICHRA to all new hires in that same class after a specific date. This is a great way to gradually transition your benefits strategy without disrupting current employees. The new hire subclass is exempt from minimum class size rules.
• Minimum Class Size: This rule applies only when you offer a traditional plan to one class and an ICHRA to another (for example, full time vs. part time). The ICHRA class must meet a minimum size:
  • 10 employees (for employers with fewer than 100 total employees)
  • 10% of total employees (for employers with 100 to 200 employees)
  • 20 employees (for employers with more than 200 employees)

This test is based on the number of employees offered the ICHRA on the first day of the plan year, not the number who actually enroll.

How SimplyHRA Simplifies Class Based Design

Navigating these rules while designing eligibility criteria for benefit classes can be overwhelming. SimplyHRA is a software platform built to make it easy.

• Smart Class Design: Build your classes (full time, part time, salaried, hourly, location based) with compliance guardrails built in. The platform automatically enforces the “same terms” rule and the 3 to 1 age variation cap.
• Automated Compliance: From generating legally required ICHRA notices to providing reports that support nondiscrimination testing, SimplyHRA keeps you audit ready.
• Seamless Administration: Integrations with your payroll or HRIS make managing eligibility, enrollment, and contributions effortless as your team changes and grows.

Ready to build a smarter, more flexible benefits plan? Get a quick demo and pricing from SimplyHRA today.

Frequently Asked Questions About Designing Eligibility Criteria for Benefit Classes

1. Can I combine different employee classes?
Yes, you can combine permitted classes. For example, you could create a class for “hourly employees in Rating Area 3.” However, any combined class must still satisfy applicable rules, including minimum class size requirements if another class is offered a traditional plan.

2. How often can I change my benefit classes and eligibility rules?
You must choose and document your classes and their definitions before the start of the plan year. You are not allowed to redefine these classes mid year. Major changes should be planned for your annual renewal.

3. What happens if my ICHRA class falls below the minimum size during the year?
The minimum class size test is performed only on the first day of the plan year. If employee turnover causes the class size to dip below the threshold later in the year, you will not fail the test for that plan year.

4. Why is documenting my class definitions so important?
Formal documentation in your official plan documents is a legal requirement. It serves as the official record for regulators, auditors, and employees, ensuring that eligibility rules are applied consistently and fairly to everyone in a given class.

5. Is designing eligibility criteria for benefit classes difficult for small businesses?
It can be, but it doesn’t have to be. Using straightforward classes like full time vs. part time or salaried vs. hourly is a simple starting point. Partnering with an expert or using a dedicated platform like SimplyHRA removes the guesswork and ensures you stay compliant from day one. Talk to an ICHRA specialist to see how easy it can be.