How to set up a Section 125 plan — the honest, step-by-step version.

Five steps, one required document, less money than you think — and two traps that catch almost everyone. This is the guide your payroll company assumes somebody already gave you.

First, what you're actually setting up

A Section 125 plan (the IRS calls it a cafeteria plan) is a piece of paperwork that gives your employees a legal permission slip: it lets them pay for certain benefits — health premiums, FSA contributions, some others — before taxes are taken out of their paycheck.

That "before" is the entire product. Employees keep more of each check. And because those pre-tax dollars don't count as wages, your business doesn't pay its share of payroll taxes on them either — roughly 7.65% of every dollar that runs through the plan. It's not exotic. It's the most boring, most legitimate tax structure in the benefits world, and it's been in the tax code since 1978.

Step 1 — Check that you actually need one (you probably do)

You need a Section 125 plan if employees contribute anything toward benefits through payroll and you want those contributions pre-tax. There is no "we're too small" exception — a two-person practice benefits the same way a 200-person company does. The simplest version, covering just premium contributions, is called a Premium Only Plan (POP), and for most small businesses it's the right starting point.

Step 2 — Get the plan document (the part everyone skips)

The IRS requires a written plan document adopted before the plan starts. Not a payroll setting — an actual document. This is the single most common compliance gap in small business America: payroll deductions running pre-tax with no document behind them.

You don't write it yourself. A benefits administrator or document provider produces it — typically $100–$300 one-time, sometimes bundled free by payroll companies. It names the plan year, the eligible benefits, and who can participate.

Step 3 — Know the owner rules before you sign

Here's the trap built for business owners specifically: you probably can't participate in your own plan. S-corp shareholders over 2%, partners in a partnership, and most LLC members are excluded by law. Your employees get the tax break; you likely don't.

Owners who miss this end up unwinding their own elections at tax time. Knowing it up front turns it from a landmine into a footnote — the plan still pays for itself through the employer payroll-tax savings on everyone else's contributions.

Step 4 — Configure payroll and collect elections

• Your payroll provider flags the deductions as "Section 125 / cafeteria" so they come out pre-tax — a settings change, not a project.
• Each participating employee signs an election form before the plan year starts. Elections lock for the year unless someone has a qualifying life event — the second trap: mid-year changes without a qualifying event can disqualify tax treatment.

Step 5 — The annual habits

Once running, the plan needs almost nothing: keep the document current, run the nondiscrimination tests each year (your administrator handles this — they check the plan doesn't unfairly favor highly-paid employees), and collect fresh elections at renewal. That's the whole maintenance load.

What this is not

If someone has pitched you a Section 125 "wellness program" promising thousands per employee in FICA savings at zero net cost — that is a different animal, and the IRS has formally flagged that design. A real plan's savings are modest, predictable, and safe. The scheme version's savings are large, magical, and borrowed from a future audit. Ask us before you sign anything like that.