The short version
If your company lets employees pay for health insurance, a flexible spending account, or dependent care benefits using pre-tax dollars, you are operating a Section 125 cafeteria plan. The IRS requires that these plans pass a series of annual tests designed to confirm the plan is not structured in a way that disproportionately benefits your highest-paid or most powerful employees.
These tests are called nondiscrimination tests. They are required every plan year, they are not filed with the IRS, and most payroll providers do not run them on your behalf even if they administer the plan itself.
If the tests are not run, or if the plan fails them, the tax benefits that make the plan worth having get stripped from the people at the top of your organization. The rest of your workforce is unaffected, but the financial and administrative fallout for the employer can be significant.
The most important deadline in this process: testing failures cannot be corrected after the plan year ends. A problem discovered in January cannot be undone for the prior year. The only window to fix a failing plan is while that plan year is still open.
Who needs to run these tests?
Any employer that offers pre-tax benefits through a written cafeteria plan is subject to nondiscrimination testing. This includes companies of all sizes, public and private, in any industry. There is no minimum employee count that exempts you.
The most common plan types that trigger the testing requirement are:
Premium Only Plan (POP)
The most basic cafeteria plan. Employees pay their share of health, dental, or vision premiums with pre-tax dollars rather than after-tax dollars.
Requires 3 core testsHealth FSA
Employees elect a dollar amount at the start of the year to use for qualified medical expenses. Reduces taxable income for both the employee and the employer.
Requires 5 tests totalDependent Care FSA (DCAP)
Employees set aside pre-tax dollars to cover childcare or other qualifying dependent care expenses. Held to a stricter and separate set of IRS standards.
Requires 7 tests totalA plan that offers all three benefit types runs all nine applicable tests. We determine which tests apply to your plan based on the information you provide and run only those.
What the tests actually measure
The tests fall into three broad categories, applied across each benefit type your plan offers.
Eligibility
The IRS examines whether the right to participate in your plan is available broadly enough across your workforce. If only certain employees can enroll, or if the enrollment conditions are structured in a way that effectively excludes lower-paid employees, the plan fails the eligibility test.
Contributions and benefits
The law requires that the value of benefits under the plan not disproportionately favor higher-paid employees when measured as a share of total compensation. A plan where executives elect significantly more in pre-tax benefits, relative to their pay, than the general employee population is likely to fail this test.
Concentration
Certain employees are classified as key employees based on their ownership stake in the business or their compensation level as officers. The plan limits how much of the total pre-tax benefit pool can flow to this group. Closely held businesses and companies with concentrated ownership fail this test more often than any other.
What happens when a plan fails
A failed test does not invalidate the plan for everyone. Employees who are not classified as highly compensated or key employees continue to receive their pre-tax benefits without any change. The consequences fall specifically on the employees the law identifies as being in a favored position.
For those employees, the favorable tax treatment on their cafeteria plan elections is revoked for that plan year. Their pre-tax elections become taxable income. The employer also loses the payroll tax savings on the affected contributions, which creates a retroactive tax liability that must be resolved.
Practically speaking, this means amended W-2s, back payroll taxes, and the administrative burden of correcting filings. The cost of remediation after a failure almost always exceeds the cost of testing before one.
The S-Corporation owner trap: shareholders who own more than 2% of an S-Corporation are treated differently under the tax code and are generally not eligible to participate in the company's cafeteria plan on the same basis as other employees. This is one of the most frequently missed issues in small business benefit plan administration and we flag it automatically when ownership data is submitted.
Who is considered highly compensated?
The definition under Section 125 is broader than most employers expect. It includes current officers of the company regardless of salary, shareholders who own more than 5% of the business, employees whose compensation exceeds the IRS threshold for highly compensated employees, and the spouses and dependents of any of those individuals.
The key employee definition used in the concentration test is similar but distinct, and applies to officers above a certain compensation level, 5% owners, and 1% owners above a compensation threshold.
These definitions matter because they determine which employees are subject to the consequences of a failed test and which employees are counted on which side of each calculation.
Why your payroll provider probably is not handling this
Administering a cafeteria plan and testing a cafeteria plan are two different services. Most payroll platforms and benefits administrators handle the former: collecting elections, processing pre-tax deductions, and managing enrollment. Very few include nondiscrimination testing as a standard part of their service offering.
If you have asked your payroll provider whether testing is being done and received a vague or affirmative answer, ask for the test results specifically. If they cannot produce documentation, testing was not done.
How 125PlanTest.com handles it
We run the applicable nondiscrimination tests for your plan and return results with enough detail for you to understand what passed, what failed, and why. If anything needs corrective action, we tell you specifically what to change and how to change it before the plan year closes.
We provide a census template. You fill in compensation, benefit elections, and ownership information for everyone who worked during the plan year, including employees who left mid-year.
We determine which of the nine tests apply to your plan type and run each one. We flag any areas of concern and document everything in a format suitable for an IRS audit file.
Your results report shows where your plan stands on each applicable test. The results are written to be understood by HR professionals and business owners, not just tax attorneys.
If a test fails, we tell you what needs to change and how to make that change before the deadline. Corrective guidance is included in every engagement at no additional cost.
Mid-year testing
The most common mistake in this space is waiting until year-end to test. By that point, if something is wrong, there may not be enough time to correct it before the plan year closes.
Mid-year testing projects what the results will look like at year-end based on current data. If the plan is trending toward a failure, a mid-year test tells you in time to make adjustments while they can still take effect.
We offer mid-year testing as a bundled option alongside year-end testing. Employers who run both consistently have more room to act and face significantly fewer compliance surprises at year-end.