How much does a Section 125 plan actually save?
A Section 125 plan saves an employer 7.65% in FICA payroll tax on every dollar employees route through it pre-tax, and it saves employees federal income tax plus their own 7.65% on those same dollars. For a 50-employee company with typical participation, the employer savings usually land in the five figures per year, and no new benefit spending is required to get them.
The rest of this page shows exactly where those numbers come from.
Where the employer savings come from
Employers pay a 7.65% FICA tax on wages, which is 6.2% for Social Security plus 1.45% for Medicare (IRS Topic 751). When an employee pays for health premiums, an FSA, or dependent care through a Section 125 cafeteria plan, that money comes out of their paycheck before payroll tax is calculated. So the employer share of FICA simply never applies to those dollars.
The math is direct: multiply the total pre-tax contributions across your team by 7.65%. If your employees run $200,000 through the plan in a year, that is $200,000 times 7.65%, or about $15,300 the company keeps instead of sending to the IRS. Every year, for as long as the plan runs.
Where the employee savings come from
The same pre-tax dollars are also shielded from the employee’s federal income tax and their own 7.65% FICA. An employee in the 22% federal bracket who contributes $4,000 pre-tax avoids roughly 22% plus 7.65%, or about $1,186 in tax on that amount. That is take-home pay they keep without changing their salary.
This is the part owners often miss: the savings sit on both sides of the paycheck at once.
A worked example: a 50-employee company
Assume 50 employees, 38 of them participate (a 75% participation rate), each contributing $4,000 per year in pre-tax benefits.
- Employer FICA saved: 38 employees times $4,000 times 7.65% equals $11,628 per year.
- Employee tax saved (22% bracket): 38 employees times $4,000 times 29.65% (22% income tax plus 7.65% FICA) equals about $45,068 per year across the team, or roughly $1,186 each.
The employer number alone typically covers the plan’s administration cost several times over.
Section 125 savings at a glance
| Who saves | Rate saved | On what | Source |
|---|---|---|---|
| Employer | 7.65% FICA | Every pre-tax dollar employees contribute | IRS Topic 751 |
| Employee | Income tax + 7.65% FICA | The same pre-tax dollars | IRS Topic 751 |
What changes your actual number
Your real savings depend on a few things:
- Participation. More employees enrolling means more pre-tax volume and more employer FICA saved. Communication drives this more than anything else.
- Contribution size. Higher pre-tax elections (within 2026 IRS limits) increase the base the 7.65% applies to.
- Wages under the Social Security wage base. In 2026 the Social Security portion (6.2%) applies to wages up to $184,500 (SSA). Below that base, the full 7.65% saving applies. Above it, only the 1.45% Medicare portion does.
- Plan design. A premium-only plan captures the savings on health premiums; extending to FSAs, dependent care, and supplemental coverage captures more.
Run your own number
The figures above are illustrative. To see the estimate for your exact headcount and contribution levels, use the free FICA savings calculator. For the mechanics behind the tax treatment, see how to reduce payroll taxes legally and the complete guide to Section 125.
This is educational information, not tax or legal advice. A qualified benefits professional can give numbers specific to your company.
