Waiting periods for group health coverage: the 90-day limit, the common designs and what each does to new hires.
What the law allows, how orientation periods fit, why “first of the month after 90 days” is a trap, and how to choose a design that fits your hiring and your carrier. Written for the owner or HR lead.
A Waiting Period Is the Gap Between Hire and Coverage
It exists to filter out very short-term hires and to give payroll time. The law caps how long it can be.
The Ninety-Day Limit
A group health plan cannot make a new employee wait more than ninety calendar days for coverage once they are otherwise eligible. Days are counted on the calendar, including weekends and holidays, so a long weekend does not extend the period. Build your plan’s waiting period with a margin, and check the effective date for the latest hire dates in a month, not just the typical case. Try our free premium proration calculator to run the numbers for your own group.
What Starts the Clock
The period runs from the date the employee meets the plan’s eligibility conditions, such as being in an eligible class and working the required hours. Hire date alone does not always start the clock. If the plan requires a minimum number of hours or a move into an eligible class, the period generally runs from when those conditions are met, so document the conditions clearly in the plan.
Why It Matters Beyond Compliance
Long waits cost recruits and leave new hires uncovered. Short waits cost more in premium and in short-tenure claims. The right choice depends on turnover, the hiring market and how the group is rated. Ask your broker to compare the premium effect of each option against how long your new hires typically stay before you decide.
Five Ways Employers Set It
Most plans use one of these.
Date of Hire
Coverage starts on the first day of employment. The most attractive to recruits and the costliest. Employees on this schedule are covered from the first day, so enrollment must be completed during onboarding. Payroll deductions and carrier notices need to be ready ahead of time, and the premium effect is greater when turnover is high.
First of the Month After Hire
Coverage starts on the first day of the next month. Simple for payroll and compatible with most carriers. A hire on the second of the month waits almost a full month, while a hire on the first starts at once. Employees often ask why hire dates seem to matter, so explain the schedule in the offer letter and onboarding materials.
First of the Month After Thirty or Sixty Days
A short wait that filters brief hires. Common and compliant. The wait gives the employer time to see who stays and spreads enrollment work to one date each month. Confirm the plan document, offer letter and carrier setup all use the same rule and the same counting method.
Ninety Days
The legal maximum. Coverage must start no later than day ninety-one. Using the full period leaves no room for error, because a processing delay or a late carrier effective date can push coverage past the limit. Most employers choose a shorter design instead of relying on the legal maximum.
“First of the Month After Ninety Days” Is Not Allowed
This one catches employers every year.
Why It Fails
If an employee is hired on the second of the month, ninety days ends mid-month. Starting coverage on the first of the next month pushes the wait beyond ninety days. Many employers get caught by this when they carry over older wording that was written before the rule applied. Test your own plan by checking the latest possible effective date for a hire made on any day of the month.
What Works
Coverage must start on or before the ninety-first day. The common compliant version is first of the month after sixty days. Counting from the date the employee becomes eligible, check the actual calendar for each hire date, not only the usual case. If your plan uses a different design, have your benefits adviser confirm that it stays within the limit.
Check Your Handbook
Many plan documents and offer letters carry the old wording. Read them. Offer letters, handbooks, summary plan descriptions and enrollment guides are often updated at different times. Compare each document to the carrier’s current setup and correct any that describe a different waiting period.
The Orientation Period
The rules allow a short period before the waiting period begins.
Up to One Month
A reasonable orientation period of up to one month can precede the waiting period to let the employer and employee assess fit. Employers sometimes use it to set expectations for a new job, such as training or a trial period, before benefits begin. The orientation period should be a real period of evaluation, not a way to delay coverage, so ask counsel before adding one.
It Is Not a Loophole
It cannot be used to push coverage beyond what the law intends. The combined time should remain reasonable. If the orientation and waiting periods are stacked in a way that looks designed to delay coverage, the plan may face compliance questions. Review the full timeline from the first day of work to the effective date with your adviser.
Write It Down
If you use one, put it in the plan document and in the offer materials. Employees generally rely on offer letters when they decide whether to accept a job, so mistakes there can cause disputes. Review them whenever you change the waiting period, and make sure managers quote the same rule.
How the Employer Mandate Treats New Full-Time Hires
A separate rule applies to employers subject to the mandate.
The Fourth-Month Rule
A large employer generally avoids one of the penalty tests if it offers coverage to a new full-time employee no later than the first day of the fourth full calendar month of employment. This rule is tied to the employer mandate and has its own conditions, so it does not replace the waiting period limit. Confirm with your benefits adviser how the two work together for your workforce and your plan’s eligible classes.
Variable-Hour Employees
They are measured before eligibility, using the look-back method, instead of waiting a fixed period. Employers using this method pick a measurement period, track hours for each variable-hour worker and then decide who must be offered coverage. Payroll data needs to be accurate, and a written policy helps keep the process consistent.
Align the Two
A waiting period shorter than the mandate deadline is fine. Longer is not. Check both rules together, because meeting the plan’s rule does not guarantee the employer mandate is met, and the reverse is also true. A single timeline for each class of employee makes mismatches easy to spot.
What the Carrier Will Accept
The contract can be narrower than the law.
Allowed Options
Carriers list the effective-date rules they support. Ask for the list before you decide. Some carriers support only certain effective-date rules, and a rule your plan document allows may not be one the carrier can administer. Get the carrier’s list in writing and match your plan design to it before you announce changes.
Mid-Year Changes
Changing the waiting period at renewal is easy. Changing it mid-year may need approval. Carriers often ask for notice, and a mid-year change can affect employees currently waiting for coverage. Plan changes for renewal when you can, and tell affected employees in advance so nobody is surprised by a new effective date.
Different Rules for Different Classes
Classes can have different waits if reasonable, and the carrier approves. Be ready to explain why the classes differ, such as full-time staff versus a distinct group, and apply the rule consistently. Because classifications can raise nondiscrimination and fairness concerns, ask counsel before setting different waits.
The questions that come before the offer letter.
Six questions employers bring us about waiting periods.
Can we make new hires wait longer than ninety days?
No. The ninety-calendar-day limit applies, with limited exceptions for hours-based eligibility conditions.
Is “first of the month after sixty days” allowed?
Yes. It always falls within ninety days.
Can we require a certain number of hours first?
Yes, eligibility can be tied to a minimum number of hours, if it is not designed to avoid coverage.
Do rehires wait again?
It depends on the break and the plan terms. Short breaks usually carry the earlier status forward.
Does the waiting period apply to dependents?
Dependents become eligible when the employee does, and enrolled dependents start the same day.
Can we waive the waiting period for a key hire?
Only if the plan allows it, applied by consistent rules, and the carrier agrees.
Ready? Send us your renewal, or talk it through with someone first. No cost, no obligation.
General information about waiting periods, not legal advice. Plan-specific questions belong with benefits counsel and your carrier, and we will bring them in.
Related guides.
Changing Your Plan Year
What a short plan year does to deductibles and accounts.
Restaurant and Hospitality Employers
Benefits for tipped, seasonal and hourly staff.
Rehired Employees and Breaks in Service
When coverage restarts for a returning employee and when a waiting period applies again.
Waiting Period Calculator
Work out your own effective dates.
Variable-Hour Employee Guide
How the ACA measures hours.
Employer Benefits Guides
All of our plain-language guides in one place.
Offer Letters and Benefit Promises
Describing coverage accurately at hire.
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