How to Calculate Section 125 Savings: A Step-by-Step Formula for Employers

• Employer FICA is 6.2% Social Security plus 1.45% Medicare, or 7.65% in total (IRS Tax Topic 751, reviewed September 2026).
• Accident and health benefits paid through a cafeteria plan are exempt from Social Security, Medicare, and FUTA tax (IRS Publication 15-B, 2026).
• The Social Security wage base is $184,500 for 2026, so high earners save less than 7.65% on part of their pre-tax dollars (Social Security Administration).
• A 20-employee business with 80% enrollment at $250 a month saves about $3,672 a year in employer FICA (disclosed hypothetical).
• Sole proprietors, partners, and 2% or greater S corporation shareholders cannot join the plan, so their pay does not count (IRS cafeteria plan training, Lesson 4).

Most employers hear that a Section 125 plan "saves payroll tax" and want a real number before they act. The good news is that the math is short. You need your headcount, a realistic enrollment rate, and the average amount each employee will set aside. This guide walks through the formula, a full example, and the mistakes that make estimates too high.

What is the formula for Section 125 savings?

The formula for Section 125 savings is total pre-tax benefit dollars multiplied by 7.65%. A Section 125 plan, also called a cafeteria plan, lets employees pay for qualified benefits before payroll taxes are calculated. The IRS says the employer rate is 6.2% for Social Security and 1.45% for Medicare, which adds up to 7.65% (IRS Tax Topic 751). Every dollar that moves out of taxable wages cuts the employer's FICA bill by 7.65 cents.

IRS Publication 15-B (2026) lists accident and health benefits as exempt from Social Security, Medicare, and FUTA when they are provided through a cafeteria plan. That exemption is the source of the savings.

How do you calculate Section 125 savings in three steps?

You calculate Section 125 savings by finding the number of enrolled employees, the average monthly election, and then applying the 7.65% rate to the annual total. Use this order.

1. Count enrolled employees. Start with W-2 employees who are eligible under the plan. Multiply by a realistic enrollment rate. Use 70% to 80% if you have no history.
2. Set the average monthly election. Use the amount an employee would pay toward premiums or other qualified benefits each month. Multiply by 12 for the annual figure.
3. Multiply by 7.65%. Employees enrolled times annual election times 0.0765 equals your employer FICA savings.

Write the result as a range, not a single promise. Enrollment changes every year, and your payroll provider's actual tax filings will show the true number.

What does a worked example look like for a 20-employee business?

A 20-employee business with 80% enrollment and a $250 monthly election saves about $3,672 a year in employer FICA. The example below is a disclosed hypothetical, not a quote or a guarantee.

Each enrolled employee also benefits. On a $250 monthly election, the employee avoids $229.50 a year in FICA ($3,000 x 7.65%). An employee in the 12% federal income tax bracket also avoids $360 in income tax ($3,000 x 12%). That is about $589.50 a year in extra take-home pay per person.

How much does an employer save at different election amounts?

Employer savings per employee rise in a straight line with the monthly election. The table shows the annual employer FICA saved per enrolled employee at four common election levels.

To scale the table, multiply the figure in the last column by the number of enrolled employees. Ten employees at $300 a month save the employer $2,754 a year.

Does the Social Security wage base change the math?

Yes, for high earners. The Social Security wage base is $184,500 for 2026, according to the Social Security Administration. Employer Social Security tax stops once an employee's wages pass that amount. Medicare tax has no wage limit (IRS Tax Topic 751).

If an employee earns $200,000 and elects $6,000 pre-tax, taxable wages drop to $194,000. That is still above $184,500, so the employer saves only the 1.45% Medicare portion, or $87. Most small business payrolls sit well below the wage base, so 7.65% is the right rate for nearly everyone on the roster. Check your top earners one by one.

Which employees should you leave out of the calculation?

Leave out anyone who is not an eligible W-2 employee. Section 125 requires participants to be employees. The IRS lists sole proprietors, partners in a partnership, and 2% or greater S corporation shareholders as ineligible (IRS cafeteria plan training, Lesson 4). Independent contractors paid on a 1099 cannot join either.

Part-time and seasonal staff count only if your written plan document makes them eligible. A wider eligible group usually means more elections and more savings. A group that favors owners and highly paid staff can fail nondiscrimination testing. Read the nondiscrimination testing guide→ before you set eligibility rules.

What mistakes make Section 125 savings estimates too high?

Estimates run too high when they assume full enrollment, count ineligible owners, or ignore plan costs. Watch for these four errors.

• Assuming 100% enrollment. Some employees decline. Use a range from 60% to 90%.
• Counting owners who cannot participate. Their pay adds nothing to the total.
• Applying 7.65% above the wage base. Use 1.45% on pre-tax dollars that sit above $184,500.
• Forgetting that elections are locked. Employees generally cannot change amounts mid-year without a qualifying life event, as explained in the Section 125 plan rules→.

State rules vary on how some benefits are taxed for income tax purposes, so confirm state treatment with your payroll provider or CPA. This guide covers federal FICA.

What do employees get besides tax savings?

Benecor Health pairs the tax savings with a benefit stack employees use. Every participant gets $0 virtual urgent care, $0 virtual primary care, $0 mental health counseling, and access to 800+ commonly prescribed medications at $0, along with dental and vision. A plan staff actually value drives higher enrollment, and higher enrollment is what raises your savings number. See the Section 125 cafeteria plan guide→ for the full picture and the setup steps→ for what launching looks like.

Sources: IRS Tax Topic 751, Social Security and Medicare withholding rates (reviewed September 24, 2026); IRS Publication 15-B, Employer's Tax Guide to Fringe Benefits (2026); Social Security Administration, Contribution and Benefit Base (2026 wage base); IRS Employee Plans training, Cafeteria Plans Lesson 4.