The Section 4976 excise tax is a 100% penalty the IRS imposes on any “disqualified benefit” paid during the year from a welfare benefit fund. For every dollar of fund assets used improperly, the employer owes a matching dollar in tax. Three situations trigger it: paying post-retirement medical or life insurance benefits to a key employee without the separate account the law requires, providing post-retirement benefits that discriminate in favor of highly compensated individuals, and letting fund assets revert to the employer.
What Counts as a Disqualified Benefit
Section 4976 defines “disqualified benefit” in three ways, each aimed at a different abuse. Any one of them, occurring in a taxable year in which the employer maintains a welfare benefit fund, is enough to trigger the tax. A single fund can generate more than one in the same year.
- Post-retirement medical or life insurance benefits paid to a key employee when the employer has not set up the separate account required by Section 419A(d), or when the benefits are paid from general fund assets instead of that dedicated account.
- Post-retirement medical or life insurance benefits provided to anyone if the plan fails the nondiscrimination requirements of Section 505(b), whether or not those requirements otherwise apply to the plan.
- Any portion of the fund that reverts to the employer’s benefit.
Who Is a Key Employee
The first trigger hinges on who counts as a “key employee,” a term Section 4976 borrows from Section 416(i). A person is a key employee for a plan year if, during that year or any preceding plan year, they fell into any of these groups:
- An officer of the employer earning more than $235,000 in 2026 (the figure is inflation-adjusted).
- An owner of more than 5% of the employer’s stock, or more than 5% of the capital or profits interest in a non-corporate employer.
- An owner of more than 1% of the employer who also earns more than $150,000 a year.
The ownership tests apply Section 318 constructive ownership, so stock held by family members or related entities can be attributed to the individual. Arrangements that spread ownership across family trusts or partnerships don’t necessarily escape the rule.
Once someone qualifies as a key employee in any plan year, the separate-account requirement follows them in later years. Section 419A(d) requires the employer to maintain a dedicated account for that employee’s post-retirement medical and life insurance benefits, and those benefits may be paid only from that account. Paying them out of the fund’s general assets makes the benefit disqualified.
The Nondiscrimination Rule
The second trigger reaches beyond key employees. Section 505(b) requires that each class of benefits be available under an employee classification the Secretary finds nondiscriminatory, and that the benefits themselves not disproportionately favor highly compensated individuals. For 2026, plans subject to Section 505(b) cannot count annual compensation above $360,000 per employee when running the tests.
If a post-retirement medical or life insurance benefit fails these rules, it becomes a disqualified benefit and draws the 100% tax. This applies even if the plan would not otherwise be subject to Section 505(b) — Section 4976 imports the standard for its own purposes.
Employer Reversions
The third trigger is the bluntest. Any fund assets that flow back to the employer are taxed at 100% of their fair market value. That covers direct transfers to the company treasury after liabilities are paid, and it covers indirect arrangements that let the employer recapture economic value from the fund. The assets got favorable tax treatment because they were set aside for employee welfare, and pulling them back defeats the reason for that treatment.
A reversion is also likely includible in the employer’s gross income for regular income tax purposes. The total cost can exceed the reverted amount once both layers apply, which employers sometimes miss when they plan only for the excise tax.
How the Tax Is Calculated
The rate is 100% of the disqualified benefit provided during the year, with no sliding scale for severity. For a reversion, the base is the fair market value of the assets returned. For discriminatory or improperly funded key-employee benefits, the base is the cost of providing them: the premiums, the medical expenses paid, or the value of the coverage.
A $50,000 post-retirement medical benefit paid to a key employee out of general fund assets produces a $50,000 excise tax on top of the $50,000 already spent on the benefit. The employer effectively pays twice.
Exceptions That Avoid the Tax
Section 4976 has three statutory exceptions, each tied to a specific trigger.
Collectively Bargained Plans
The nondiscrimination trigger does not apply to a plan maintained under a collective bargaining agreement, provided the Secretary finds that the agreement is genuine and that the post-retirement benefits were the subject of good-faith bargaining. This exception addresses only the discrimination trigger. It does not shield the plan from the separate-account or reversion rules.
Nondeductible Contributions
If the assets reverting to the employer are attributable to contributions that were never deductible under Section 419, the reversion is not a disqualified benefit. Amounts that never received the tax advantage are not what the excise tax is designed to recapture. Contributions disallowed in the current and all prior taxable years fall into this category and are also excluded from the Section 419(d) carryover.
Existing Post-Retirement Reserves
Post-retirement medical or life insurance benefits charged against an existing reserve as defined in Section 512(a)(3)(E), or against the income earned on that reserve, are exempt from both the separate-account and nondiscrimination triggers. Benefits have to actually come out of those reserves rather than out of general fund assets for the exception to apply.
Reporting the Tax on Form 5330
Employers who owe the Section 4976 tax report it on Form 5330, Return of Excise Taxes Related to Employee Benefit Plans. The Section 4976 tax goes on line 4 of Part I, Section A. The form asks for the employer’s name, address, and EIN, the plan number, and the date the disqualified benefit was provided or the reversion occurred.
Form 5330 can be filed electronically through the IRS Modernized e-File system via an authorized provider, and the IRS encourages electronic filing. Paper returns go to the Internal Revenue Service Center in Ogden, UT 84201. The current form and instructions are on the IRS website.
Deadline and Extensions
Form 5330 for Section 4976 taxes is due by the last day of the seventh month after the end of the employer’s taxable year. For a calendar-year employer, that is July 31 of the following year.
An employer that needs more time files Form 8868, Application for Extension of Time To File an Exempt Organization Return or Excise Taxes Related to Employee Benefit Plans, before the original deadline. An approved extension adds up to six months to the filing date. Form 5558, used for Form 5500-series returns, cannot be used to extend Form 5330; the IRS explicitly prohibits it.
An extension of time to file is not an extension of time to pay. The full tax is due on the original filing date even if the return itself is filed later.
Late-Filing and Late-Payment Penalties
Missing the deadline triggers a failure-to-file penalty of 5% of the unpaid tax per month or partial month, capped at 25%. A separate failure-to-pay penalty of 0.5% per month applies to any unpaid balance, also capped at 25%. If the IRS issues a notice of intent to levy and the tax remains unpaid after 10 days, the failure-to-pay rate jumps to 1% per month. These penalties stack on top of a tax that already equals 100% of the disqualified benefit.
Requesting Penalty Relief
The IRS may waive the failure-to-file and failure-to-pay penalties for reasonable cause. This is a facts-and-circumstances determination, and the employer must show it exercised ordinary care and prudence but still could not comply on time. Fires, natural disasters, serious illness, and system failures that prevented timely electronic filing are the kinds of reasons that succeed.
Reasons that typically fail include reliance on a tax professional (the employer remains responsible), lack of knowledge about the filing obligation, and ordinary oversights. Lack of funds by itself is not reasonable cause for a failure to pay.
You can request relief by calling the number on any IRS penalty notice or by filing Form 843, Claim for Refund and Request for Abatement, in writing. Either request should explain what happened, when it happened, how it prevented compliance, and what steps you took to try to meet the obligation. Supporting documents — hospital records, disaster declarations, correspondence with a tax professional — strengthen the case.