3 Things You Need to Launch an FSA for Your Team

It's Simpler Than You Think

A Flexible Spending Account (FSA) lets employees set aside pre-tax dollars for medical expenses. It's one of the most valuable benefits you can offer — and one of the easiest to implement. Most companies can go from zero to live FSA in under two weeks.

Here are the three things you need.

1. A Section 125 Plan Document

An FSA can only exist inside a Section 125 cafeteria plan. The plan document is the legal foundation — it outlines which benefits are offered, eligibility rules, the plan year, and how elections work. This document is required by the IRS and must be in place before the first deduction.

If you already have a Section 125 plan for health insurance premium deductions, you may just need to amend it to add an FSA component. If you don't have one at all, your benefits partner or third-party administrator can create it.

2. A Third-Party Administrator (TPA)

FSAs require claims processing — when an employee submits a receipt for an eligible expense, someone needs to verify it and issue reimbursement. A TPA handles this, along with compliance testing, debit card management (if offered), and end-of-year reporting.

TPA costs vary by provider and plan design, so the TPA or your benefits partner gives you exact pricing. They are usually modest relative to the FICA savings: a company with 30 employees each contributing $2,000 saves roughly $4,590 a year in employer FICA (30 × $2,000 × 7.65%), which typically covers the administration fee with room to spare.

3. Payroll Integration

FSA contributions need to be deducted from each paycheck as pre-tax. This means your payroll system (ADP, Gusto, Paychex, etc.) needs to be configured to process these deductions correctly. Most modern payroll platforms have built-in support for Section 125 deductions — it's typically a settings change, not custom development.

Your TPA or benefits partner will usually handle the payroll integration as part of the setup process.

Timeline: What to Expect

• Days 1–3: Plan document drafted and signed
• Days 3–5: TPA selected and account established
• Days 5–10: Employee enrollment and payroll configuration
• Day 10+: First pre-tax deductions begin on next payroll

Most of these steps run in parallel. The actual work required from your HR team or business owner is minimal — usually a few hours total across the process.