How to Write an Open Enrollment Announcement Email That Employees Actually Read
Open Enrollment | Mini Guide | By OneBenefits
An open enrollment announcement email is the formal message, sent about 6 weeks before the enrollment window opens, that tells employees when enrollment starts and ends, what is changing this year, and where to go for more information. It sets the tone for the entire cycle: get it right and every later message lands on prepared ears.
Most announcement emails fail the same way. They try to explain everything at once, run 800 words long, and bury the enrollment dates under plan details nobody asked for yet. The announcement has one job: make employees aware and point them to a single destination. Education comes later.
Alt text: Annotated open enrollment announcement email showing the subject line, window dates, headline changes, and a single call to action.
The five elements every announcement email needs
A subject line with the date in it. "Open Enrollment starts Nov 1. Here's what's new" beats "Important benefits information." Employees triage their inbox by relevance, and a date is instant relevance.
The enrollment window, stated twice. Put the start and end dates near the top and repeat them near the call to action. The deadline is the single most searched-for fact in the entire cycle.
Only the headline changes. Two or three bullets: what is new, what costs changed, what stayed the same. The last one matters more than most teams think; employees who need no action deserve to know it in ten seconds.
One call to action. A single button or link to the benefits portal or enrollment hub. Two links split clicks; five links kill them.
A sender employees recognize. The announcement should come from HR leadership or company leadership, not a no-reply address. Sender trust is the difference between an open and an archive.
When to send it
Send the formal announcement about 6 weeks before the window opens, with a short save-the-date teaser a week or two earlier so it does not land cold. From there, the cycle follows the phases in our Open Enrollment Communication Guide: education at 4 weeks, reminders at 2 weeks, and a daily cadence during enrollment week.
Writing the announcement is a one-hour task. Writing the announcement plus the education series, the reminder sequence, the SMS nudges, and the manager briefings is the part that swallows HR's calendar. That production work is what an AI-powered benefits communication platform like OneBenefits automates: it drafts the full sequence from your own plan documents, personalizes it by employee segment, and schedules it across email, SMS, and chat. It works the same whether you are an employer running one company's enrollment, a broker running fifty, or a communication agency delivering it under your own brand.
Frequently asked questions
When should the open enrollment announcement email be sent?
About 6 weeks before the enrollment window opens, ideally preceded by a brief save-the-date teaser. This leaves room for the education and reminder phases before the deadline.
How long should an open enrollment announcement email be?
Under 200 words. The announcement's job is awareness and a single click to the enrollment hub, not education. Plan details, comparisons, and FAQs belong in the education phase that follows.
Who should send the open enrollment announcement?
HR leadership or company leadership, from a real named sender. A recognizable sender signals importance and materially improves open rates compared to a generic or no-reply address.
The takeaway
One dated subject line, the window stated twice, the headline changes, one call to action, and a sender people trust. That is the whole formula. Schedule a demo to see OneBenefits draft your announcement and the entire sequence behind it from your own benefits documents.
