Why Pre-Tax Benefits Enrollment Rates Matter More Than You Think

Here’s a frustrating reality we at Benefits Genius see regularly: Employers spend thousands of dollars implementing Section 125 cafeteria plans, but then watch helplessly as employee enrollment rates stay flat.

An employer might have saved $11,475 in FICA taxes if 100% of their team enrolled in pre-tax benefits. But if only 50% enroll? The savings drop to $5,738—a 50% reduction in ROI. And worse, they never explain why to their employees, so nobody realizes what they’re leaving on the table.

The result: Fewer employees with more money in their pockets. Lower employer savings. And the entire value proposition of the plan evaporates.

Let’s look at why enrollment rates matter so much—and what actually works to improve them.

The Enrollment Reality: What Percentage Actually Participate?

Before we dive into solutions, let’s establish where most companies actually stand.

National enrollment rates for pre-tax benefits typically fall in these ranges:

• Health insurance premiums: 85–95% (high, because most employees take employer health coverage)
• Health FSA (medical): 25–45% (medium—many employees underestimate medical expenses)
• Dependent Care FSA: 10–25% (lower—only relevant to families with childcare)
• HSA contributions: 15–35% (lower—many employees don’t understand HSAs or think they’re complicated)
• Commuter benefits: 5–15% (very low—many employees either drive alone or don’t realize it’s available)

“At least one pre-tax benefit” enrollment: 40–70% on average

This means in a typical 25-person company, only 10–17.5 people are taking advantage of pre-tax benefits. The other 7.5–15 people are paying taxes on money they’re already planning to spend.

The Cost of Low Enrollment: Real Numbers

Let’s use our earlier example: Company X, 25 employees, $6,000 average pre-tax deductions if everyone enrolled.

Scenario 1: 50% Enrollment Rate (12 employees)

• Total pre-tax deductions: $75,000
• Employer FICA savings: 75,000 × 7.65% = $5,738
• Employee tax savings (combined): ~$22,500
• Total annual savings across company: $28,238
• Left on the table: $28,238 (the other 50%)

Scenario 2: 70% Enrollment Rate (17.5 employees)

• Total pre-tax deductions: $105,000
• Employer FICA savings: 105,000 × 7.65% = $8,033
• Employee tax savings (combined): ~$31,500
• Total annual savings across company: $39,533
• Left on the table: $14,119 (30% of potential)

Scenario 3: 85% Enrollment Rate (21 employees)

• Total pre-tax deductions: $127,500
• Employer FICA savings: 127,500 × 7.65% = $9,754
• Employee tax savings (combined): ~$38,250
• Total annual savings across company: $48,004
• Left on the table: $9,335 (15% of potential)

Scenario 4: 100% Enrollment Rate (25 employees)

• Total pre-tax deductions: $150,000
• Employer FICA savings: 150,000 × 7.65% = $11,475
• Employee tax savings (combined): ~$45,000
• Total annual savings across company: $56,475
• Left on the table: $0

The takeaway: The difference between 50% and 85% enrollment is $4,016 in annual employer FICA savings. Over 5 years, that’s $20,000. Over 10 years, it’s $40,000. All of that is recoverable through better communication and enrollment.

Why Enrollment Rates Are Typically Low

Before jumping to solutions, we need to understand why employees don’t enroll, even when the math clearly shows they should.

Reason 1: “I Didn’t Know This Was Available”

This is the #1 cause of low enrollment we see. Many employers send out a “benefits summary” or an email during open enrollment. Employees skim it, don’t understand it, and assume it’s “not for them.”

Pre-tax benefits sound complicated. FSA sounds like another acronym. Section 125 means nothing to most people. So employees skip it. Many employees don’t realize they can engage with content like benefits enrollment communication guidance to help them understand their options.

The fix: Education during open enrollment, not just a mass email.

Reason 2: “I Don’t Want to Risk My FSA Money”

Health FSAs operate under a “use it or lose it” rule (though most plans now offer a $640 rollover or 2.5-month grace period). Many employees fear contributing to an FSA because they think: “What if I don’t have medical expenses? I lose my money.”

This is a perception problem more than a reality problem. Most working adults have some medical expenses. But the fear is real, and it keeps enrollment down.

The fix: Clear explanation of use-it-or-lose-it rules, and education about realistic medical expenses.

Reason 3: “This Is Only Worth It If I’m Rich”

Some employees assume pre-tax benefits are a luxury for high earners. They don’t realize that a $35K earner benefits more proportionally from pre-tax benefits than a $100K earner.

The fix: Show real numbers at different salary levels. Concrete examples beat abstract claims every time.

Reason 4: “I’m Not Sure How Much to Contribute”

Open enrollment asks: “How much do you want to contribute to your Health FSA?” Many employees freeze. They don’t know. They’ve never tracked medical expenses. They don’t want to guess wrong.

So they contribute $0.

The fix: Give employees a simple worksheet to estimate expenses. Or offer a “default” FSA contribution that employees can adjust.

Reason 5: “I’m Overwhelmed by Open Enrollment”

Modern open enrollment is a lot. Health plan choice. Dental tier selection. Vision. Life insurance elections. Beneficiary updates. And then FSA, HSA, and commuter benefits on top of that.

Employees get overwhelmed and just click “keep the same as last year” without engaging with anything new.

The fix: Break open enrollment into multiple smaller communications, spread over 2-3 weeks.

Proven Strategies to Boost Enrollment Rates

Strategy 1: One-on-One Conversations (The Most Effective)

The single best predictor of enrollment: Did someone talk to the employee about it in person or on a video call?

If your HR manager or a benefits counselor has a 15-minute conversation with each employee during open enrollment, enrollment rates typically jump from 50% to 75%+.

Why it works: People engage more in conversation. Questions get answered immediately. Fear dissipates.

Cost: 1–2 hours of HR time per employee. For a 25-person company, that’s roughly 8–10 hours total. Totally doable.

The challenge: Scaled to large companies, this is labor-intensive. But for companies under 100 people, it’s the highest-ROI use of HR time.

Strategy 2: “Benefit of the Month” Communication

Instead of one massive open enrollment push, communicate about different benefits on different weeks:

• Week 1: Pre-tax benefits and Section 125 basics (with a calculator)
• Week 2: Health FSA—what qualifies, how to estimate, rollover rules
• Week 3: Dependent Care FSA and commuter benefits
• Week 4: HSAs and long-term health savings
• Week 5: Q&A and deadline reminders

This keeps people engaged longer and gives them time to ask questions.

Increase to expect: 5–10% improvement in overall enrollment rates.

Strategy 3: Real-Dollar Savings Examples

Don’t say: “You could save up to 30% in taxes.”

Do say: “If you earn $52,000/year and contribute $6,000 to pre-tax benefits, you’ll save $1,560 in taxes this year—that’s $130 every month in extra take-home pay.”

Specific numbers drive enrollment way more than percentages.

Best practice: Create 3–4 different scenarios (single, married, with kids) that show real savings for typical employees.

Strategy 4: Default Contributions

Some companies offer a “default FSA contribution” of $1,500–$2,000 that employees are automatically enrolled in unless they opt out. Employees who disagree can lower it or opt out entirely.

This simple change increases FSA participation by 15–25% because of inertia. Most people don’t actively opt out—and those who do are making a conscious choice.

Challenge: Some employees feel uncomfortable with automatic enrollment. Be transparent that it’s optional.

Strategy 5: Offer a Simplified “Core” Plan

Instead of asking employees to choose between 17 different pre-tax benefit combinations, offer a simple path:

• Bronze: Health insurance premium only (automatic if you take insurance)
• Silver: Health insurance + $1,500 Health FSA
• Gold: Health insurance + $2,500 Health FSA + HSA (if eligible)
• Custom: Build your own

This simplifies the decision and increases enrollment because people can grasp the options quickly.

Strategy 6: Partner With a Benefits Counselor or TPA

Some TPAs offer enrollment support services—a neutral third party who explains benefits to employees (not trying to sell anything). This increases engagement and enrollment by 10–20%.

The cost is usually $200–$500 for a small company, but the FICA savings ROI often exceed this cost within months.

The Enrollment Window: Why Timing Matters

Most employers have a fixed open enrollment window (typically 30 days per year). Enrollment after that window closes requires a qualifying life event (marriage, birth, divorce, loss of coverage).

This matters because: If an employee misses the deadline by one day, they have to wait until next year. That’s 12 months of lost tax savings.

We at Benefits Genius recommend:

• Start communications 2–3 weeks before open enrollment starts
• Provide multiple deadlines (soft deadline 1 week early for HR to process; final deadline at the end)
• Send reminder emails on days 1, 7, 14, 21, and 27 of the open enrollment period
• Call out the specific date/time the window closes

This small amount of outreach prevents procrastination-driven no-shows.

What Happens When Enrollment Increases

Let’s say Company X runs through these strategies and manages to increase pre-tax benefit enrollment from 50% to 85%. Here’s the financial impact:

Year 1 improvement:

• Additional FICA savings: $9,754 – $5,738 = $4,016
• Communication and counselor cost: ~$800
• Net improvement: $3,216

Year 2-5 (recurring):

• Additional annual FICA savings: $4,016/year
• No incremental communication costs (it’s part of regular open enrollment)
• 5-year cumulative improvement: $16,064

A modest increase in enrollment rates compounds over time.

Red Flags: When Enrollment Rates Signal Bigger Problems

Sometimes low enrollment isn’t just about communication—it’s a warning sign of bigger issues.

If pre-tax benefit enrollment is below 35%, ask yourself:

1. Are employees confused about eligibility? Maybe the plan document isn’t clear about who can participate.

2. Are employees distrusting the system? This sometimes happens if employees have had bad experiences with FSA claims being denied or if they don’t trust the TPA.

3. Is the benefits package weak? If employees don’t value the health insurance offered, they won’t be motivated to optimize it pre-tax.

4. Is the company experiencing turnover? High turnover means fewer people have stability to plan ahead for pre-tax benefits.

These are signals that require deeper investigation, not just better marketing.

The Long-Term View: Enrollment Rate Trends

When we at Benefits Genius help companies implement new pre-tax benefit programs, we typically see this enrollment pattern:

• Year 1: 40–50% enrollment (awareness phase)
• Year 2: 55–65% enrollment (word-of-mouth builds)
• Year 3: 65–75% enrollment (employees see coworkers benefiting)
• Year 4+: 70–80% plateau (steady state, usually)

Experienced benefits consultants call this the “adoption curve.” The good news: Each year, more employees understand and enroll. The bad news: 20–30% of employees simply never engage, no matter what.

Conclusion: Enrollment Rates Are a Leverage Point

Here’s what we want you to take away: Enrollment rates are one of the highest-leverage areas in benefits administration.

A 50% increase in enrollment rates (from 50% to 75%) costs almost nothing to implement—just better communication, education, and maybe one conversation per employee. Yet it delivers thousands of dollars in additional tax savings for both the employer and employees.

This isn’t about pushing employees to participate. It’s about removing the barriers that prevent them from participating—and making sure they understand the math.

For employers: Every percentage point increase in enrollment improves your ROI on the Section 125 plan. For employees: Participation literally means hundreds of dollars more per year in take-home pay.

What We at Benefits Genius Recommend

1. Measure your baseline. At your next open enrollment, track what percentage of eligible employees actually enroll in each benefit. Don’t guess—count.

2. Identify the gap. If you’re at 50% but could be at 75%, that gap represents recoverable money.

3. Test one intervention. Run one-on-one conversations for open enrollment next year. See if enrollment improves.

4. Iterate. Based on what works, build it into your standard open enrollment playbook.

5. Communicate the impact. Tell employees: “Last year, this team saved $45,000 in taxes through pre-tax benefits. If you enrolled, you were part of that.”

Enrollment rates feel like an HR operational metric. But they’re actually a direct lever on financial outcomes—for your business and for your team.

Ready to assess your enrollment rates and identify improvement opportunities? Contact Benefits Genius for a consultation on optimizing your open enrollment strategy.

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This article is for educational purposes and does not constitute business, tax, or legal advice. Enrollment rates and benefits utilization vary by company, industry, and employee demographics. Consult with a qualified benefits professional for guidance specific to your situation.