What to Expect in Your First Year of Section 125

You’ve decided to implement a Section 125 plan. The plan document is signed, your TPA is onboarded, and enrollment is about to begin. Now what?

The first year of any Section 125 plan is a learning curve — for you, your team, and your employees. Understanding what to expect month by month can prevent frustration, set realistic expectations, and help you build toward stronger results in year two and beyond. For the overall implementation process, see Section 125 Implementation Guide.

Here’s an honest look at what your first year will actually look like.

Before Launch: Setting the Foundation (Month 0)

The work starts before your plan goes live. In the weeks leading up to your effective date, you’ll need to:

• Finalize your plan document with your TPA, specifying which benefits are included, eligibility rules, and plan year dates
• Coordinate with payroll to set up pre-tax deduction codes and make sure they’ll flow correctly on the first pay period
• Prepare employee communications — enrollment forms, plan summaries, FAQ sheets
• Train your HR team (even if that’s just you) on how to handle enrollment questions, qualifying life events, and basic plan administration
• Set your enrollment window — typically 2 to 4 weeks before the plan effective date

This pre-launch phase takes 2 to 6 weeks depending on your company size and how complex your plan is. Don’t rush it. A smooth launch saves you headaches for the next 12 months.

Months 1-2: Launch and Enrollment

This is the most intensive period. Here’s what you’ll be dealing with:

Employee Communication

Your biggest job right now is education. Most employees have never heard of “Section 125” and don’t understand what “pre-tax” really means for their paycheck. You’ll need to explain:

• What’s changing (and what’s not)
• How pre-tax deductions reduce their taxable income
• What it means for their take-home pay (more money, not less)
• How to enroll and what forms to complete
• The deadline for enrollment

Expect questions. Lots of them. Common ones include:

• “Will this affect my Social Security benefits?” (Technically yes, but the tax savings now almost always outweigh the marginal future reduction.)
• “Can I change my elections later?” (Only during open enrollment or after a qualifying life event.)
• “Is this going to lower my pay?” (No — it redirects money you’re already spending on benefits to come out pre-tax.)

Participation Rates

Here’s something most providers won’t tell you upfront: first-year participation is usually lower than you’d like. If you’re starting with a Premium Only Plan (POP), participation among employees who already have health insurance through you will be high — often 80% or more — because it’s essentially automatic savings.

But if you’re launching FSA or other optional components, expect 20% to 40% participation in year one. Employees who don’t understand the plan won’t sign up for it. That’s normal. It grows.

Payroll Coordination

Your first payroll run with pre-tax deductions is a critical checkpoint. Verify that:

• Deductions are coded correctly (pre-tax, not post-tax)
• The right amounts are being withheld
• W-2 reporting is set up to handle the deductions properly
• Any payroll errors are caught and corrected immediately

A single payroll miscoding can cause tax reporting issues that take months to untangle. Double-check everything on that first pay stub.

Months 3-4: Settling In

The initial rush is over. Enrollment is complete, payroll is running, and things start to normalize. But stay attentive:

New hire enrollments will start coming in. Make sure you have a clear process for offering Section 125 benefits to new employees within their eligibility window (typically 30 days from hire date).

Qualifying life events will pop up — marriages, births, divorces, spouse job changes. Each of these may allow an employee to change their elections mid-year. Your TPA should guide you on documentation requirements.

Employee questions continue, but they shift from “What is this?” to “How does this work for my specific situation?” Have your TPA’s contact information readily available.

Months 5-8: The Quiet Middle

If things are working well, this period should be relatively quiet. Your main responsibilities:

• Process changes for qualifying life events as they occur
• Monitor participation — are new hires enrolling? Are employees utilizing their FSA (if applicable)?
• Track your savings — pull a report from payroll showing total pre-tax deductions and calculate your FICA savings so far
• Document any issues you’ve encountered for your year-end review

This is also a good time to start thinking about whether your plan is structured optimally. Are there benefits you should add for year two? Are employees asking for options you don’t currently offer?

Months 9-10: Compliance Season

Several important compliance activities happen in the second half of your plan year:

Nondiscrimination Testing

Your TPA should run nondiscrimination tests to make sure your plan isn’t disproportionately benefiting highly compensated employees (HCEs) or key employees. The three main tests are:

1. Eligibility test — Are enough non-HCEs eligible to participate?
2. Benefits and contributions test — Are benefits distributed fairly?
3. Key employee concentration test — Do key employees receive less than 25% of total benefits?

If your plan fails testing, you have options to correct it — but it’s better to catch issues early than to scramble at year end.

FSA Run-Out Period Planning

If your plan includes an FSA, start communicating to employees about their account balances. The “use it or lose it” rule means unused FSA funds are forfeited at the end of the plan year (with a possible $640 carryover or 2.5-month grace period, depending on your plan design).

Employees who haven’t spent their FSA funds need reminders now, not on December 31.

Months 11-12: Year-End Review and Open Enrollment

The final stretch of year one is about closing the books and planning for year two.

Year-End Compliance

• Ensure all nondiscrimination tests are complete and documented
• Verify that payroll deductions reconcile with plan records
• Prepare Form 5500 if required (plans with 100+ participants)
• Update plan documents to reflect any regulatory changes for the new plan year

Open Enrollment for Year Two

This is your chance to improve participation. Armed with a full year of data, you can now:

• Share real savings numbers with employees: “Employees on our plan saved an average of $1,200 in taxes last year”
• Address common objections you heard during year one
• Simplify enrollment based on lessons learned
• Add new benefit options if there’s demand

Open enrollment typically runs 2 to 4 weeks and should begin 30 to 60 days before your plan year renewal date.

Common First-Year Challenges

Even well-implemented plans hit bumps. Here are the most common ones:

Low Participation

As mentioned, this is normal in year one. The fix is better education, not plan restructuring. Consider:

• One-on-one enrollment meetings instead of just email blasts
• Simple one-page flyers showing dollar-amount savings by salary level
• Having your TPA present at an all-hands meeting

Employee Confusion About Mid-Year Changes

Employees who didn’t sign up during enrollment will want to join mid-year. Under IRS rules, they generally can’t — unless they have a qualifying life event. This frustrates people. Set expectations clearly during enrollment that this is a once-a-year decision.

Payroll Integration Issues

If your payroll system doesn’t integrate cleanly with your TPA’s platform, you may end up with manual data entry, which means more errors. If this is a persistent problem in year one, consider switching to a TPA that integrates with your payroll provider before year two.

Manager Buy-In

Sometimes the HR team is on board but department managers don’t prioritize enrollment communication. Getting leadership to champion the plan — even briefly — can significantly boost participation.

Realistic Savings Expectations

Be honest with yourself and your leadership about year-one numbers:

• FICA savings will be real but possibly lower than projected, because participation may not hit your initial estimates
• Employee satisfaction impact is hard to measure in year one — give it time
• Administrative burden is highest in year one — it gets easier

A reasonable expectation for a 50-employee company with 60% participation in year one:

• Employer FICA savings: $9,000 to $12,000
• Employee tax savings: $15,000 to $25,000 combined
• Plan cost: $2,000 to $4,000

By year two, with participation climbing to 75% or higher, those employer savings could jump to $15,000+ with the same plan cost.

Planning for Year Two

As you close out year one, start planning improvements:

1. Boost participation with better communication and real savings data
2. Consider adding FSA or dependent care if you started with a POP-only plan
3. Evaluate your TPA — did they deliver on their promises? Is the technology working?
4. Update your plan document to reflect any changes
5. Set savings targets for year two based on actual year-one data

The companies that get the most out of Section 125 treat year one as the foundation, not the finish line. Every year the plan runs, participation grows, processes smooth out, and savings compound.

The Bottom Line

Your first year of Section 125 won’t be perfect, and that’s fine. What matters is that you launch the plan correctly, communicate clearly with employees, stay on top of compliance, and learn from the experience. Avoid common Section 125 mistakes that can complicate your first year.

By the time you’re planning year two, you’ll have real data, smoother processes, and employees who understand the value of pre-tax benefits. That’s when the plan really starts to deliver.

Want to see what your first-year savings could look like? Try our Company Savings Estimator to model the numbers for your company.