Knowledge Base
IRC 415(b) Limits
What CPAs, advisors, and business owners need to know before pushing defined benefit plan deductions higher.
2025 Annual Limit $280,000
The IRS increased the annual defined benefit dollar limit under section 415(b)(1)(A) from $275,000 to $280,000 for 2025, and that figure is part of the annual retirement-plan limit updates the IRS publishes for cost-of-living adjustments.
IRC 415(b) is one of the key guardrails in defined benefit plan design. It limits the annual benefit payable from a qualified defined benefit plan when that benefit is measured as a straight life annuity, and the limit is generally the lesser of the dollar cap or 100 percent of the participant's high-three average compensation.
That may sound technical, but it has real planning consequences. It affects benefit formulas, actuarial calculations, projected retirement income, and how aggressive a cash balance strategy can be.
If you are a CPA, EA, tax preparer, advisor, or business owner looking at larger retirement plan deductions, this is not just compliance fine print. It is one of the rules that helps determine how far a defined benefit or cash balance design can go before adjustments are required.
What IRC 415(b) Actually Limits
In plain English, IRC 415(b) limits the annual pension benefit that can be paid from a qualified defined benefit plan. IRS guidance defines "annual benefit" as a benefit payable annually in the form of a straight life annuity, which is why defined benefit testing starts there.
That matters because many plans do not pay benefits in a pure straight life annuity format. When a plan uses another payment form, the benefit generally has to be converted to an actuarially equivalent straight life annuity before applying the 415 limit.
This is where people often get tripped up. They assume the rule is just a single published dollar figure, when in practice the result can change based on age, payment form, actuarial assumptions, and plan language.
Why This Matters in Cash Balance Planning
Cash balance plans sit inside the defined benefit world, so IRC 415(b) is part of the design conversation from the start. For high-income owners, that matters because larger deductible employer contributions in the cash balance layer are driven by actuarial design rather than a simple fixed contribution ceiling alone.
That is one reason advanced plan design can create a much bigger planning opportunity than a standalone 401(k). A coordinated strategy may include a Cash Balance Defined Benefit plan, Profit Sharing/401(k), and in some cases a 401(h) medical reimbursement component, but the design still has to stay within the applicable legal and actuarial limits.
Many successful business owners reach a point where traditional retirement planning no longer creates meaningful deductions. That is where a more structured, properly designed retirement strategy can become worth serious review.
Why Age and Benefit Form Change the Answer
IRC 415(b) does not work like one flat number for everyone. IRS guidance explains that actuarial adjustments may be required when benefits start before or after the applicable retirement age, and separate rules apply when the benefit is paid in an optional form rather than a straight life annuity.
If benefits begin before age 62, the dollar limitation may have to be reduced under the applicable adjustment rules. If benefits begin later, the limitation may be adjusted upward under the late-commencement rules, subject to the rest of the section 415 framework.
Payment form matters too. IRS guidance explains that lump sums, term-certain annuities, and other optional forms can require conversion back to an equivalent straight life annuity for 415 testing purposes.
That is why a simple illustration is never enough on its own. The actual result depends on commencement age, benefit form, plan assumptions, and the way the plan document handles actuarial equivalence.
Before Age 62
The dollar limitation may have to be reduced under the applicable adjustment rules.
After Applicable Age
The limitation may be adjusted upward under the late-commencement rules.
Optional Payment Forms
Lump sums and term-certain annuities require conversion to an equivalent straight life annuity.
Who Should Pay Close Attention to This Rule
This issue is especially relevant for CPAs, EAs, tax preparers, financial advisors, and business owners reviewing whether a defined benefit or cash balance structure can support larger deductions responsibly. It is most useful when the client already has strong income, steady cash flow, and a sense that a traditional retirement plan no longer matches the scale of the business.
A common fit profile includes income often around $300,000 or more, stable or predictable cash flow, and a willingness to commit to multi-year planning discipline. That framing matters because not every business owner is a fit for advanced defined benefit planning, and a good screening process saves time for everyone.
An Illustrative Planning Scenario
In one educational example, a business owner with $550,000 of income had a traditional 401(k) maximum deduction of $72,000. A coordinated design illustration showed the following breakdown:
Educational Illustration — Business Owner, $550,000 Income
Cash Balance Contribution $210,000
Profit Sharing / 401(k) $72,000
401(h) Medical Allocation $25,000
Total Potential Deduction $307,000
That example helps show why advanced retirement plan design gets the attention of tax professionals. It also needs the right caveat: actual results depend on age, compensation, employee census, funding objectives, benefit commencement assumptions, and plan terms.
How We Approach the Work
At Retirement Actuarial Services, the process starts with a quick qualifier, moves into a feasibility review, and then proceeds to coordinated plan design with the client's CPA and advisory team. That flow makes sense because advanced plan work should be screened before it is sold and modeled before it is implemented.
The goal is not to chase the biggest possible deduction on paper. The goal is to build a plan that is technically sound, sustainable, documented properly, and aligned with the client's broader tax and retirement strategy.
1
Quick Qualifier — Screen the client's fit before investing time in detailed modeling.
2
Feasibility Review — Review income, census, benefit timing, plan terms, and deduction objectives together.
3
Coordinated Plan Design — Work with the client's CPA and advisory team to build a technically sound, sustainable plan.
A Practical Next Step
If you are trying to determine whether IRC 415(b) is a limiting factor in a client's plan, the right next step is not guessing from a chart. It is reviewing the client's age, income, census, benefit timing, plan document terms, and overall deduction objectives together.
That review is often where the real value shows up. Sometimes the result is that a coordinated defined benefit strategy is a strong fit, and sometimes the result is that the client is not ready yet — both outcomes are useful when they come from real analysis instead of rough assumptions.
Frequently Asked Questions
IRC 415(b) limits the annual benefit payable from a qualified defined benefit plan, measured as a straight life annuity, and the plan also must satisfy the compensation-based limit tied to the participant's high-three average compensation.
For 2025, the IRS increased the defined benefit annual dollar limit under section 415(b)(1)(A) to $280,000.
Yes. IRS guidance explains that benefits starting before age 62 can require a reduction to the dollar limit, while later commencement can require an actuarial increase under the applicable rules.
A cash balance plan is a defined benefit arrangement, so its payable benefits still have to be tested under section 415(b), including any required actuarial adjustments for benefit form and commencement age.
No. IRS Notice 2024-80 lists a separate 2025 section 415(c) defined contribution limit of $70,000, while the section 415(b)(1)(A) defined benefit annual limit is $280,000.
Yes. Optional forms such as lump sums may need to be converted to an actuarially equivalent straight life annuity before the section 415 limit is applied.
A referral often makes sense when the client has high income, predictable cash flow, and a sense that traditional retirement planning is no longer producing meaningful deductions.
