Open Enrollment Communication Plan: Targeted Emails, a Deadline Cadence, and Proof It Landed

The open enrollment email nobody opened is the deadline nobody meets. An open enrollment communication plan stops that with four moves. Send each employee group the version that applies to them, schedule reminders by counting back from the deadline, retarget only the people who haven't engaged, and finish with a timestamped record of who confirmed they read it. Most teams do the first send well and then hope. The plan is everything after the first send.

This season carries a bigger bill than usual. In its preliminary survey of more than 1,800 U.S. employers, Mercer found employers expect total health benefit cost per employee to rise 8.2% on average in 2027, the highest increase since 2003. When costs move that much, a missed enrollment window turns into an expensive mistake for the employee and a long line of support tickets for HR. Season communication is a different job from the year-round work of benefits communication to employees, which runs on its own playbook.

Fast Facts on Open Enrollment Communication

• What open enrollment is: the window each year when employees can choose or change employer-sponsored benefits, add or remove dependents, and confirm what carries over into the next plan year.
• When it runs: employer open enrollment typically runs in the fall, and the employer sets the dates. There is no single national window for employer plans.
• What HR has to communicate: what changed, who it affects, when the window opens and closes, where to enroll, and who to ask for help.
• The four moves: a version per segment, a cadence built back from the deadline, retargeting for the employees who haven't engaged, and acknowledgments that confirm who read it before the window closes.

What Changed for the 2027 Plan Year: Employees Want Stability

Total rewards messaging has a new center of gravity this year. In a May 2026 survey of 10,055 employees, Gartner found that employee total rewards preferences have shifted toward stability. The 15 most valued offerings are dominated by those that provide financial stability and protection against unexpected future costs. Paid time off and work-life balance matter less to employees than they did in the past. According to Augustus Vickery, Director Analyst in the Gartner HR practice, "As workforce needs shift, and become more fragmented, medical benefits, long-term incentives, and flexible financial benefits have become more important."

The cost numbers for the same season explain why. In the same Mercer survey, 59% of employers plan cost-cutting changes to health benefits in 2027, including plan design changes like higher deductibles. About two-thirds of large employers, those with 500 or more employees, expect to increase employees' share of premium costs. Employees care most about protection from surprise costs in the same year many of them will watch their costs go up.

That combination changes what an open enrollment email to employees should lead with. The perks section that used to open the announcement belongs lower down. Lead with cost and coverage, and tell each group what changed for them, whether that's a higher deductible on their plan or a new premium share for their tier. Employees who can see their own situation in the first two lines keep reading. Employees who get a generic "exciting updates to your benefits package" learn to wait for the reminder, and some of them wait past the deadline.

How Open Enrollment Works

Most employees get health, dental, vision, and life insurance through their employer, and open enrollment is the one window each year when they can change those elections without a qualifying life event such as a marriage or a new baby. Outside that window, the choices they made (or didn't make) stay locked for the plan year. Government programs such as the ACA Marketplace and Medicare run their own enrollment periods on their own schedules, which earns one line in your FAQ for employees who ask, but it isn't what your plan is built around.

Your HR team explains what changed and makes sure employees understand their options before the window closes. In practice, that job includes:

• Sending the open enrollment announcement and the reminders that follow it
• Running informational sessions, virtual or in person
• Providing detailed materials such as benefit guides and FAQs
• Coordinating with carriers and brokers to answer employee questions

All of it rides on an email that gets read, which is where most plans break down.

4 Typical Pains During Open Enrollment

Every open enrollment season hits the same four problems, and each one maps to a step in the plan.

Employees are too busy to enroll. People are working, and enrollment feels like homework. It's harder still for remote and frontline employees who don't sit in front of an inbox all day. One all-staff blast that reads as generic is easy to put off, which is why the plan starts with segments that make the message about the reader.

Employees don't understand what's offered. Benefits language is dense, and plan documents get written for compliance review. When the deadline arrives, people who never understood their options either default into last year's elections or scramble. A cadence that spaces out "what's changing for you" from the enrollment mechanics gives people time to take it in.

Small teams have no dedicated benefits staff. Plenty of organizations run open enrollment with an office manager or a one-person HR function, which makes chasing non-responders by hand impossible. The hidden cost of benefits communication shows up here, in hours spent answering the same question and in elections that go wrong. Retargeting does the chasing for you.

There's no system, so nobody knows who saw what. Information lives in a shared drive and three inboxes, and when someone says they never got the notice, there's no way to check. Acknowledgments close that gap with a record per employee.

Build the Plan: Segment Employees First

The first step of an open enrollment communication plan happens before anyone writes a subject line. Decide who needs which version of the message, because "all employees" is rarely the right audience for anything past the save-the-date.

Four cuts cover most organizations. Eligibility comes first, because full-time and part-time employees need different messages, and enrollment instructions sent to someone who isn't eligible generate confused replies. Location and state matter when carriers or state-mandated coverage differ by site.

Life stage matters because new parents and new hires going through their first open enrollment care about different parts of the package. Work setting matters for delivery, since frontline employees and employees on leave each need a route to the message that works for them. Employees on leave are the group that falls off the list most often, because the list gets built from whoever happens to be in the office, and they have the same right to the information as everyone else.

Each segment gets a version that leads with what changed for them. The body can share most of its content, but the first paragraph should be specific. "Your medical carrier in Ohio is changing on January 1" lands in a way that "We have updates to our benefits package" never will.

Where those segments come from matters as much as how you define them. A spreadsheet someone exported in August is out of date by October, and hand-kept employee distribution lists miss the new hire who started last week and still include the person who left. In Cerkl Broadcast, Audience Manager builds dynamic segments from live HR data (department, location, hire date, time zone, or any mapped attribute) and keeps them current as employee records change. Build the open enrollment segments once, and they're still accurate on the day of the final reminder.

The Send Cadence: Count Back From the Deadline

One announcement leaves the rest of the season to chance. Start with the enrollment deadline and work backward, so every open enrollment email to employees has a job and a date. A cadence that works for most employers looks like this:

Sending the first notice about a month out is the category best practice, because it gives employees time to think about life changes before they're asked to act on them. The "what's changing for you" send is the one most plans skip, and it's the one that does the most to cut confused questions once the window opens.

Distributed teams need one more setting. An 8 a.m. reminder sent from headquarters lands at 5 a.m. on the West Coast and midday overseas. Broadcast scheduling supports custom time zones, and for same-local-hour sends you duplicate the Blast for each time-zone segment and schedule each copy in its own zone. Tag every send in the sequence to one Campaign, the tagging layer that groups related Blasts for reporting in Insights, so the season reports as a whole instead of as six unrelated emails. The same backward-from-the-deadline logic runs HR tax season communications, so once you've built it for open enrollment, you can reuse the structure in January.

Open Enrollment Announcement Templates

Use these as starting points and edit for your plan year and your voice. Each one is short on purpose, because the people you most need to reach are the ones with the least time to read.

Pre-Enrollment Notice

Subject: Open enrollment for 2027 benefits starts [START DATE]

It's that time of year. Open enrollment for your 2027 benefits runs from [START DATE] to [END DATE]. We'll share what's changing next week, so mark your calendar now and think about any life changes (a new dependent or a move) that might affect your choices.

Questions before then? Contact [HR/BENEFITS CONTACT].

Open Enrollment Start Announcement

Subject: Open enrollment is open. Make your 2027 choices by [END DATE]

Open enrollment runs from [START DATE] to [END DATE]. During this window, you can:

• Compare plans and choose the coverage that fits your needs
• Add or drop dependents
• Confirm whether your current benefits continue, since some may not carry over

Enroll at [PORTAL LINK]. If you do nothing, [DEFAULT ELECTION RULE].

Confirm you've reviewed your options. [ACKNOWLEDGMENT BUTTON]

Questions? Contact [HR/BENEFITS CONTACT].

Day-Before Deadline Reminder

Subject: Tomorrow is the last day to enroll in 2027 benefits

A reminder that open enrollment closes tomorrow, [END DATE], at [TIME AND TIME ZONE]. To finish:

• Log in to [PORTAL LINK]
• Compare your options
• Make your selections and submit before the deadline

Need help? Reach out to [CONTACT NAME/DETAILS] today.

Segment Variant: "Your Plan Changed"

Subject: Your medical plan in [LOCATION] is changing for 2027

Hi [FIRST NAME], for the 2027 plan year, employees in [LOCATION] will move from [CURRENT CARRIER] to [NEW CARRIER]. For you, that means [ONE-LINE SUMMARY OF COST AND COVERAGE CHANGE]. Your doctors may or may not be in the new network, so check the directory at [LINK] before you choose a plan.

Open enrollment runs [START DATE] to [END DATE]. Join a 20-minute session on the change at [SESSION DETAILS].

Open Enrollment Reminder Email for Non-Engagers

Subject: You haven't made your 2027 benefits choices yet

Hi [FIRST NAME], our records show you haven't reviewed your open enrollment options yet. The window closes [END DATE]. It takes about [TIME ESTIMATE] at [PORTAL LINK], and if you do nothing, [DEFAULT ELECTION RULE].

Confirm you've reviewed your options. [ACKNOWLEDGMENT BUTTON]

That last template only works if it goes to the right people.

Retarget the Employees Who Haven't Engaged

After each send in the cadence, some employees open and click through to the portal, and some don't. Resending to everyone treats both groups the same, which annoys the people who already acted and teaches them that opening early earns more email. Resend only to the ones who haven't engaged.

In Broadcast, employee email retargeting runs from a sent Blast. You pick the trigger, and Broadcast builds the follow-up audience from it. Send only to employees who never opened the original, or only to the ones who never confirmed the acknowledgment. You can schedule a retarget up to 180 days after the original send, which covers any enrollment window, and Broadcast drops anyone who engages before it fires. Schedule the three-days-out reminder as a retarget of the opening-day announcement, and the only people who get it are the ones who still need it.

The effect across a season is fewer emails to people who already acted and more reminders for the people who haven't. That's the right trade in both directions, and it's the part a generic checklist can't do for you.

Confirm Who Read It Before the Window Closes

An open rate is not proof that anyone read the email. Apple's Mail Privacy Protection downloads remote content in the background by default, whether or not the recipient engages with the email, so a pixel "open" tells you nothing about a person. On the security side, Microsoft's documentation for Safe Links in Microsoft Defender for Office 365 says URLs are scanned before the message is delivered, which means link activity can show up before any employee has seen the email. Opens tell you the message arrived somewhere. They don't tell you who read it.

The reliable confirmation is an acknowledgment. The employee clicks the acknowledgment element in the email and confirms on a landing page. Broadcast records the timestamp against their name and gives HR a per-employee list of who confirmed and when, exportable for the file. The mechanics behind acknowledgments in internal comms are the same ones compliance teams use for policy updates and safety notices.

The timing matters more than the tool. Use the per-employee view to chase stragglers while the window is still open. Pulling it after the deadline only explains why forty people missed it. Pull the list a week out and retarget the employees who haven't confirmed. Whoever is still missing goes to their manager for a direct conversation. When you report on the season, say "confirmed they read it" only for employees who acknowledged, and "opened" for opens.

Distribute Across Channels

Email is the backbone of the plan because it's the channel you can segment, schedule, retarget, and measure. Everything else supports it. Live or virtual benefits sessions answer the questions email can't, and managers are the most effective reminder you have for frontline teams who rarely check a work inbox. Post the key dates and links wherever your employees already look, and make sure every channel points back to the same portal and the same deadline.

On paid Broadcast plans, you can also send real calendar invites for benefits sessions, so the session lands on the employee's calendar instead of in a link they have to save. When the season ends, a recurring employee benefits newsletter keeps benefits in view for the rest of the year, so next fall's announcement isn't the first time employees have thought about their coverage in twelve months.

Run Your Open Enrollment Plan Free

Everything in this plan runs on Cerkl Broadcast's free Foundations plan. Audience Manager segments, scheduling with custom time zones, retargeting, acknowledgments, Campaigns, and Insights are all included, along with the template library for the announcements above. Foundations is free forever with 3 communicator seats and 5,000 sends per month, which covers a full open enrollment season for most small and midsize teams. The internal email platform is built for employee communication, so the segments come from HR data and the reporting tells you about people.

Start with the deadline and schedule the save-the-date this week. If the first send goes out a month ahead and every send after it goes only to the people who still need it, the deadline stops being a surprise to anyone.