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What if I already have a pension?

Subsection (a) shall be applied by substituting “50 percent” for “20 percent” with respect to any employer reversion from a qualified plan unless: (A) the employer establishes or maintains a qualified replacement plan, or (B) the plan provides benefit increases meeting the requirements of paragraph (3).

A tax on surplus an employer takes back from a plan, not on investment gains. The base rate in section 4980(a) is 20 percent. Read 26 U.S.C. 4980(d)(1) in full (opens in a new tab)

The short answer

A plan you already sponsor can be overfunded in more than one sense, and each sense is read from a different document: Schedule SB, the actuary's deduction maximum or the actuary's termination valuation. No tax falls on investment gains inside a running plan; the 50 percent figure is the excise tax on surplus an employer takes back at termination without a qualified replacement plan or pro rata benefit increases, and the rate is 20 percent with either one. A pension buyout means buying annuities from an insurer to settle plan benefits, and for a small plan it is part of ending the plan.

What does overfunded mean?

Overfunded can mean different things, and each has its own rule: plan assets above the funding target under section 430, which shrinks the minimum contribution; a contribution above the deduction ceiling in section 404(o), which is not deductible that year; or assets above the cost of paying every benefit when the plan ends, which leaves a surplus.

What overfunded can mean
MeaningWhat followsWhere it is readSource
Assets above the funding targetThe minimum contribution is the target normal cost, reduced but not below zero by the excess.Schedule SB of the plan’s Form 550026 U.S.C. 430(a)(2) (opens in a new tab)
A contribution above the deduction ceilingThe excess is not deductible that year and is taxed at 10 percent each year it stays nondeductible.The enrolled actuary’s yearly maximum26 U.S.C. 404(o)(1); 4972(a) (opens in a new tab)
Assets above the cost of every benefit at terminationA surplus, taxed if the employer takes it back.The enrolled actuary’s termination valuation26 U.S.C. 4980 (opens in a new tab)

A plan can be overfunded in the first sense and still have no surplus at termination, because the price of buying annuities for every participant differs from the funding target.

Is there a 50 percent tax on an overfunded plan?

Not on overfunding. The 50 percent rate is an excise tax on surplus an employer takes back when a plan ends, and it applies only if the employer neither keeps a qualified replacement plan nor grants pro rata benefit increases. With either one the rate is 20 percent. Income tax is due on the amount as well.

Investment gains inside a running plan are not taxed; they reduce future contributions. A contribution above the deductible ceiling is taxed at 10 percent each year it stays nondeductible. An unpaid minimum contribution is taxed at 10 percent, then 100 percent if not corrected. A funding shortfall is made up over 15 plan years, not all at once.

26 U.S.C. 4980(a) and (d)(1) (opens in a new tab)26 U.S.C. 4972(a) (opens in a new tab)26 U.S.C. 4971 (opens in a new tab)26 U.S.C. 430(c)(8) (opens in a new tab)

How do I check whether my plan is overfunded?

Read Schedule SB of the plan’s last Form 5500. The enrolled actuary reports the plan’s assets, its funding target and its funding target attainment percentage there, and those show whether assets exceed the funding target. Whether the plan would have a surplus at termination needs the actuary’s termination valuation, because annuity prices differ from the funding target.

Funded status is a fact on the filing, not a guess about the stock market. A plan that did well in a strong market can still show no surplus once the actuary prices its benefits as they would be settled at termination. Schedule SB is filed with Form 5500 by the last day of the 7th calendar month after the plan year ends, so the most recent one describes a year already closed.

U.S. Department of Labor, 2025 Form 5500 instructions (opens in a new tab)

What can an overfunded plan do with the surplus?

While the plan runs, the surplus stays in the plan. Contributions fall, because the minimum is reduced by the excess, and benefits can rise by amendment within the section 415 limit and the nondiscrimination tests. Publication 560 says of a running plan, “As a general rule, the assets can't be diverted to the employer.”

A benefit increase cannot take effect while the plan’s adjusted funding target attainment percentage is below 80 percent, or would fall below it with the amendment. Section 420 allows a narrow transfer of assets well above the funding target to pay retiree health benefits or retiree life insurance, and to pay nothing else. When the plan ends, surplus can raise benefits pro rata, move to a qualified replacement plan, or return to the employer, which pays the reversion tax and income tax.

Internal Revenue Service, Publication 560 (opens in a new tab)26 U.S.C. 436(c) (opens in a new tab)26 U.S.C. 420 (opens in a new tab)

How do I end the plan?

Can surplus move into my 401(k)?

Only when the plan ends. Section 4980(d) lets an employer transfer part of the surplus to a qualified replacement plan, such as a 401(k) or profit sharing plan, and pay the lower reversion rate of 20 percent on what it takes back. No current law lets a running defined benefit plan move surplus into a 401(k).

A qualified replacement plan must meet tests in section 4980(d)(2), including how many of the ended plan’s active participants it covers and how much of the surplus moves into it before any reversion.

26 U.S.C. 4980(d) (opens in a new tab)

Can I keep my 401(k) too?

What happens if I put in too much in one year?

A contribution above the deduction ceiling in section 404(o) is not deductible that year, and section 4972 taxes it at 10 percent for each year it stays nondeductible, though it can be carried forward and deducted later. The enrolled actuary’s yearly maximum exists to keep a contribution under that ceiling.

The ceiling for a single-employer plan is the greater of the plan’s funding target plus normal cost plus a cushion, less assets, or the section 430 minimum. Publication 560 puts the rule in one line: “Defined benefit plans. The deduction for contributions to a defined benefit plan is based on actuarial assumptions and computations. Consequently, an actuary must figure your deduction limit.”

26 U.S.C. 4972(a) (opens in a new tab)26 U.S.C. 404(o)(1) (opens in a new tab)Internal Revenue Service, Publication 560 (opens in a new tab)

What is a pension buyout?

A pension buyout, often called pension risk transfer, means buying annuities from an insurance company to settle plan benefits. For a small plan, a buyout is part of ending the plan: each participant who does not take a lump sum receives an annuity from an insurer in place of the plan’s promise.

Choosing the insurer is a fiduciary decision. The Department of Labor requires the fiduciary choosing the insurer to seek the safest annuity available, unless doing otherwise would be in the participants’ interest, and says reliance solely on ratings from insurance rating services is not enough.

How often plans with fewer than 100 participants performed a pension risk transfer activity
What was countedPlans that didPlans countedSource
Plans with fewer than 100 participants that performed a pension risk transfer activity, 2015 to 202232931,432Pension Benefit Guaranty Corporation, 2024 pension risk transfer analysis (opens in a new tab)

The PBGC’s count covers only plans that file PBGC premiums. The PBGC does not cover a professional service employer’s plan that has never had more than 25 active participants at any time after September 2, 1974, or a plan maintained only for substantial owners, meaning owners of more than 10 percent of the business, so those plans are not in the count.

29 CFR 2509.95-1(c) (opens in a new tab)29 U.S.C. 1321(b)(9) and (b)(13) (opens in a new tab)

Checked on October 15, 2026.

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