Deductibility of 401(k) Contributions and Health Care Benefits by C-Corporations and S-Corporations

Thursday, May 01, 2025

Business Structuring Secrets Blog/Deductibility of 401(k) Contributions and Health Care Benefits by C-Corporations and S-Corporations

Issue

Are C-Corporations and S-Corporations able to deduct contributions to 401(k) plans and health care benefits, and which entity type is more advantageous for health care benefits?

Short Answer

Both C-Corporations and S-Corporations can deduct contributions to 401(k) plans, but the rules and tax implications differ. C-Corporations are generally more advantageous for providing health care benefits.

Analysis

General Rule for Deductibility of 401(k) Contributions:

C-Corporations: Under IRC § 404(a), contributions paid by an employer to a stock bonus, pension, profit-sharing, or annuity plan, or if compensation is paid or accrued on account of any employee under a plan deferring the receipt of such compensation, such contributions or compensation shall not be deductible under this chapter; but, if they would otherwise be deductible, they shall be deductible under this section, subject to certain limitations as to the amounts deductible in any year.

S-Corporations: Contributions to 401(k) plans are deductible by the corporation, but shareholders who own more than 2% of the stock are treated as self-employed individuals for purposes of fringe benefits, including health care benefits.

Specific Rules for 401(k) Plans:

C-Corporations: Contributions to a 401(k) plan are generally deductible in the taxable year when paid, provided they meet the requirements of IRC § 404(a)(3). This includes contributions to profit-sharing and stock bonus plans, which are subject to a limit of 25% of the compensation paid or accrued during the taxable year to the beneficiaries under the plan.

S-Corporations: Similar rules apply, but the treatment of more than 2% shareholders as self-employed individuals affects the deductibility of fringe benefits.

Timing of Contributions:

C-Corporations: Contributions are considered made on the last day of the preceding taxable year if the payment is on account of such taxable year and is made not later than the time prescribed by law for filing the return for such taxable year (including extensions).

S-Corporations: The same timing rules apply for contributions to 401(k) plans.

Health Care Benefits:

C-Corporations: Health care benefits provided to employees, including shareholders, are fully deductible by the corporation and are not included in the taxable income of the employees.

S-Corporations: Health care benefits provided to more than 2% shareholders are included in their taxable income. However, these shareholders can then deduct the cost of health insurance premiums on their personal tax returns under IRC § 162(l), subject to certain limitations.

Conclusion

While both C-Corporations and S-Corporations can deduct contributions to 401(k) plans, C-Corporations offer a more advantageous structure for providing health care benefits. In a C-Corporation, health care benefits are fully deductible by the corporation and are not included in the taxable income of the employees, including shareholders. In contrast, S-Corporation shareholders who own more than 2% of the stock must include health care benefits in their taxable income, although they can deduct the cost of health insurance premiums on their personal tax returns.

Therefore, for businesses looking to maximize the tax benefits of providing health care benefits, a C-Corporation structure is generally more advantageous.

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