The Case for Longer Windows
Longer measurement windows give one cycle a year, one round of notices and fewer status changes. Averages over twelve months absorb a busy season or a slow one without flipping anyone.
The three things to know.
Smoothing
A 12-month window dilutes a few unusual months, so one summer peak or winter dip does not decide an employee’s status.
Less Administration
One measurement cycle, one administrative period and one stability period per year cuts the number of notices and enrollment events.
What You Give Up
Every decision is locked in for a year. An employee found full-time stays covered through a long stability period even if their hours fall, which adds cost.
Sources: 26 CFR § 54.4980H-3. General information, not legal advice.
A worked example.
A Volatile Retail Workforce
A retailer’s hours run high from November to January and low the rest of the year. An associate works 40 hours a week in the holiday months and 22 the rest of the year.
What the Rule Produces
Her 12-month average is about 27 hours a week, below the line, so she is not full-time for the stability period. A three-month window ending in January would have counted her as full-time.
Four steps to apply it.
1. Test the data
Run last year’s hours through each window length.
2. Compare results
See how many employees change status.
3. Weigh the cost
Estimate the cost of holding full-time results for a year.
4. Decide
Choose the window that fits your hours pattern.
Where it goes wrong. Choosing a long window without considering how many employees stay covered after their hours fall.
The questions that come up next.
Is 12 months always best?
No. It suits steady workforces and an annual enrollment calendar. If hours shift quickly, a shorter window responds faster.
Does a longer window raise our penalty risk?
Not by itself. The risk comes from misclassification and missed offers, which a clean calendar reduces.
Can we move from 12 to six months later?
Yes, with a documented change and transition planning.
Does a longer window reduce paperwork?
Yes, there is one cycle a year, but each decision lasts longer.
Can we lengthen it later?
Yes, with documented transition planning.
Plan-specific questions belong with ERISA counsel, and we will bring them in.
Related pages on the look-back method.
The Case for Shorter Windows
Shorter measurement windows react faster.
Employees Found Not Full-Time
For employees found not full-time, the stability period cannot be longer than the measurement period.
The Full Look-Back Guide
Every rule, example and source behind this page, in one place.
Talk it through with someone who runs this every year.
We help you choose the design, document it and reconcile the hours before the numbers reach your reporting.
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