How are Defined Benefit Plans Taxed? Income and Payroll Tax Implications.

This article has been updated for 2025.

Introduction: How Are Defined Benefit Plans Taxed?

Defined Benefit Plans are among the most effective retirement and tax planning vehicles for business owners. However, before adopting a plan, it’s essential to understand how these plans are taxed.

To answer this question, we will explain taxation at each stage of the plan:

1. Funding (Contributions) – how the employer contribution and employee participants are taxed.
2. Growth (Investments) – how plan assets are treated while invested.
3. Distribution (Payouts) – how benefits are taxed when received by owners or employees.

This article explains each stage in detail, with special focus on how taxation works for small businesses and owner-only Defined Benefit Plans.

How Defined Benefit Plans Are Funded and Distributed

A Defined Benefit Plan works very differently from a Defined Contribution Plan. In a Defined Contribution Plan, employees contribute a portion of their pay, often with employer matching, and employees control how the money is invested. At retirement, the employee receives whatever balance has accumulated in the account.

By contrast, a Defined Benefit Plan guarantees a specific retirement benefit based on a formula (often tied to salary and years of service). In this type of plan, the employer, not the employee, is responsible for funding the benefit and managing the investment risk. This structure provides employees with predictable retirement income, while the employer assumes the cost and investment responsibilities.

• Funding: Employers must pre-fund benefits by making annual contributions, determined by an Enrolled Actuary. These contributions go into a pooled trust account.
• Growth: Contributions and investment gains accumulate.
• Distribution: At retirement or separation, employees can receive benefits as a monthly annuity, a lump sum cash payout, or a rollover into an IRA.

This structure creates both tax advantages and tax obligations for the employee and employer.

Small Business Examples: How Are Defined Benefits Taxed?

To understand how taxation works in practice, let’s look at examples for small businesses, including both an owner-only business and an owner and employee business.

One-Person Business (Owner-Only Plan)

In a one-person business, the owner wears two hats, as both the employer and the employee. This creates unique tax advantages:

• Plan adoption: The employer (owner) sets up the Defined Benefit Plan.
• Plan funding: The employer (the owner) makes tax-deductible contributions on behalf of the employee (also the owner).
• Employee taxation: The owner is not taxed on contributions made on their behalf.
• Investment growth: Earnings on plan assets are tax-deferred.
• Distributions: Upon plan termination, benefits up to the maximum payout can be rolled into an IRA, deferring income tax until withdrawals are made.

The owner’s dual role as both employer and employee allows small business owners to leverage maximum tax benefits while maintaining retirement flexibility.

Two-Person Business (Owner + Employee)

For a small business with one owner and one employee, the process is similar but includes nondiscrimination testing to protect employees:

• Plan adoption: The employer (owner) establishes the Defined Benefit Plan.
• Plan funding: Tax-deductible contributions are made to provide benefits for both the owner and the employee.
• Employee taxation: The owner and employee are not taxed on contributions made on their behalf.
• Investment growth: Earnings on plan assets grow tax-deferred.
• Distributions: At plan termination, the owner and employee can roll their benefit to an IRA, receive a lump sum payment, or elect a lifetime monthly annuity. If the funds are not rolled over, the benefit is taxed as ordinary income.
• Nondiscrimination rules: The plan must pass testing to ensure benefits are fairly allocated and do not disproportionately favor the owner.

This scenario highlights how Defined Benefit Plans provide significant income tax advantages, but employers must comply with nondiscrimination rules.

Taxation of Defined Benefit Plans: Employer and Employee

Also, consider the plan from both the employer’s and the employee’s viewpoint. Tax treatment differs at each stage — contributions, investment growth, and distributions — and understanding these rules can help maximize income tax and payroll tax benefits.

1. Employer Contributions Are Tax-Deductible

• All permissible contributions are deductible business expenses.
• Deduction limits are generous: employers can fund up to 150% of unfunded past liabilities, the unfunded value of the current year’s benefit increase, and future expected salary increases.

2. Investment Gains Are Tax-Deferred

• Plan assets grow without immediate taxation.
• No annual tax on dividends, interest, or capital gains.
• This tax deferral creates the advantage of compounded growth, not available to taxable investment accounts.

3. Employee Distributions Are Taxed as Ordinary Income

• Benefits are not taxed when funded on the employees’ behalf.
• Benefits are taxable only when paid.
• Monthly annuity payments: taxed as received.
• Lump sum payout: fully taxable when not rolled into an IRA or other qualified plan.
• Rollover to an IRA: defers income tax until retirement withdrawals, then taxed as ordinary income.

Important: Distributions do not qualify for capital gains treatment. All benefits are taxed as regular income.

Rollovers to IRAs: Extending Tax Deferral

Upon plan termination, retirement, or separation of service, employees (including the owner) can receive their benefits in different ways.

• Lifetime payments: Taxes are paid only on the amounts received each year.
• Lump-sum distribution: The entire balance can be taken and taxed all at once.
• Rollover to an IRA: The rollover is not taxed, and income tax continues to be deferred. Withdrawals from the IRA are taxed as ordinary income.

In all cases, benefits are taxed as regular income, with no special capital gains treatment.

Defined Benefits, Earned Income, and Payroll Taxes

Defined Benefit Plan contributions are always tied to eligible plan compensation, which generally means W-2 wages. For non-owner employees, this is straightforward since their compensation is already paid as wages.

For business owners, compensation is more complex. An S-Corporation owner, for instance, must pay sufficient W-2 wages to support their targeted retirement deduction, as shareholder distributions do not count as plan compensation.

In practice, this often means increasing W-2 pay for at least three consecutive years to maximize Defined Benefit Plan contributions. While this temporarily raises payroll taxes, it also allows much larger retirement plan deductions. Once the three-year period ends, W-2 pay can often be reduced again if deemed reasonable by a CPA.

Unlike S-Corporation owners, Sole Proprietors cannot adjust their plan compensation to manage payroll taxes. Their entire net income is subject to self-employment tax, and that amount may be higher than is needed to generate the targeted Defined Benefit Plan contribution. By contrast, S-Corporation owners can strategically adjust W-2 wages — increasing them to support higher plan deductions or lowering them later to reduce payroll taxes.

Another key payroll tax advantage is that Defined Benefit Plan contributions themselves are not treated as wages. That means contributions are not subject to Social Security or Medicare taxes, helping to lower overall payroll tax liability compared to strategies that rely solely on higher wages. For S-Corporation owners, the trade-off requires careful planning: increasing W-2 wages may raise payroll taxes in the short term, but it can also unlock much larger deductible contributions and greater long-term tax savings when structured strategically.

Conclusion: How Are Defined Benefit Plans Taxed?

Defined Benefit Plans are one of the most tax-advantaged programs available to business owners:

• Contributions – tax-deductible to the employer and not immediately taxable to the employee.
• Growth – tax-deferred until distribution.
• Distributions – taxed as ordinary income, with rollover options to extend deferral.
• Payroll Taxes – reduced compared to Defined Contribution Plans.

For high-income professionals and small business owners, understanding how Defined Benefit Plans are taxed is key to maximizing deductions, reducing current tax liability, and securing a powerful retirement strategy.