Don’t Use a SEP IRA
How High-Income Owners Reduce Taxes with 401(k) and Cash Balance Plans in 2026
Why a SEP-IRA stops working at $350K of income — and the defined benefit structure that lets owners in their 50s shelter $300,000 a year.
The Quick Read
If you're a $500K+ owner maxing a SEP-IRA, you're likely deferring 70–75% less than you could. Layering a 401(k) and a cash balance plan can absorb $200K+ in pre-tax income annually — frequently the single move that brings an SSTB owner back inside the §199A deduction zone. Cash balance plans require October lead time. After November, you've usually missed the year.
- What a Cash Balance Plan Actually Is
- 2026 Contribution Capacity by Age (Visualized)
- Stacking a Cash Balance Plan on Top of a 401(k)
- The QBI Connection: Why SSTB Owners Lean on This
- Employees, Coverage, and the Gateway Minimum
- Worked Example: SEP vs. Layered Structure
- Wind-Down, Freezes, and the Five-Year Rule
- Frequently Asked Questions
The maximum SEP-IRA contribution for 2026 is $72,000 — equal to the §415(c) defined contribution annual addition limit. If you're earning $500,000, that is a 14.4% pre-tax savings rate. For most of the country, that would be considered excellent. But if you're in the 37% federal bracket plus North Carolina state tax, it leaves roughly $80,000 to $130,000 of additional annual deferral capacity sitting unused — capacity that the tax code explicitly permits, and that an actuarially designed plan can capture. If you're a high-income owner contributing only to a SEP-IRA, you're likely deferring less than half of what you could be — every year, for the rest of your career as an owner.
A cash balance plan, layered on top of a 401(k) with profit sharing, is how high-income owners — particularly those in their 50s and 60s — close that gap. For the right profile, the combined annual contribution can land between $200,000 and $360,000 of fully deductible savings, every year, for as long as the plan is maintained. We'll walk through Linda's case — a 54-year-old SSTB owner who shifts from a maxed SEP-IRA to a layered structure and recovers an incremental $82,000 of annual tax deferral — later in the piece.
This is not a niche maneuver. If you're an SSTB owner pushed above the §199A phase-out threshold, it is often the single most powerful planning move available to you. For non-SSTB owners with stable cash flow, it is the closest thing in the code to a controlled, multi-decade tax arbitrage.
What a Cash Balance Plan Actually Is
A cash balance plan is a defined benefit pension plan, but designed to look and feel like a defined contribution plan to participants. Each year, the participant's hypothetical account is credited with a "pay credit" (a dollar contribution, set by plan design) and an "interest credit" (a fixed or bond-linked rate, typically 4% to 5%). At retirement, the accrued balance is portable as a lump sum and almost always rolled to an IRA.
The reason these plans exist as a planning tool is the §415(b) annual benefit cap. For 2026, the maximum permitted defined benefit annuity at retirement is $290,000 per year (up from $280,000 in 2025). Actuaries work backward from that endpoint: given an owner's age, expected retirement date, and assumed interest credit, how much must be contributed each year so the projected accrued balance funds a $290,000 lifetime annuity at age 62 or 65? That back-calculation is what produces the eye-popping age-graded contributions that make this plan type unique.
If you're age 45, you have 17 to 20 years to fund the projected benefit, so the annual contribution is moderate. If you're age 60, you have only a handful of years to do the same work, so the annual contribution is large. Cash balance contribution capacity is, structurally, an age-driven curve.
2026 Contribution Capacity by Age, Visualized
The age-60-to-63 column reflects SECURE 2.0's super catch-up window, which permits an additional $11,250 elective deferral on the 401(k) side beyond the standard $8,000 age-50 catch-up. After 63, the catch-up reverts to $8,000.
2026 Combined Plan Limits — Quick Reference
401(k) elective deferral: $24,500
Catch-up (age 50+): $8,000
Super catch-up (age 60-63): $11,250
§415(c) DC annual addition cap: $72,000
§415(b) DB annual benefit cap: $290,000
Cash balance — age 45 owner: ~$130K/year
Cash balance — age 55 owner: ~$245K/year
Cash balance — age 65 owner: ~$290K/year
Cash balance figures depend on compensation, plan design, and actuarial assumptions. Owners with FICA wages above $145,000 in the prior year must make 401(k) catch-up contributions on a Roth basis under SECURE 2.0, which removes their pre-tax effect.
Stacking a Cash Balance Plan on Top of a 401(k)
A cash balance plan rarely stands alone. The standard structure is a three-layer stack: a 401(k) elective deferral, a profit-sharing contribution, and a cash balance pay credit. Each layer is governed by a different limit, and they coordinate in specific ways.
The 401(k) deferral layer is fixed: $24,500 for 2026, plus catch-ups if you're over 50. The profit-sharing layer fills the rest of the §415(c) bucket up to $72,000 (employer plus employee, excluding catch-ups). When you add a cash balance plan on top, IRS rules cap the profit-sharing component at 6% of compensation rather than the 25% otherwise available — that interaction is one of the most commonly missed details, and it is the reason the 401(k)-side number on a combined plan is closer to $80,000 than to the standalone $90,000-plus figure you might calculate on your own. In exchange for that 6% ceiling, the cash balance plan layer adds anywhere from $130,000 to $290,000 of annual capacity, and the combined deduction is far larger than either plan alone could deliver.
The QBI Connection: Why SSTB Owners Lean on This
The cash balance plan does double duty if you're caught in the §199A phase-out. For 2026, the QBI deduction begins to phase out at $403,500 of taxable income (MFJ) and is fully eliminated for SSTBs at $553,500. Above that ceiling, if you run a consulting, legal, financial, or medical practice, you lose the deduction entirely — there is no W-2 wage workaround.
The only remaining lever is taxable income itself. A $200,000 cash balance contribution does not just defer $200,000 of tax to retirement; if you're an SSTB owner near the upper threshold, it can also restore tens of thousands of dollars of QBI deduction in the same year. The combined effect is what makes this plan type the single highest-leverage retirement decision in the SSTB universe — it is, in effect, two tax benefits stacked on the same dollar.
Employees, Coverage, and the Gateway Minimum
The plan design changes meaningfully when there are non-owner employees. Defined benefit plans are subject to the §410(b) coverage rules, the §401(a)(4) general nondiscrimination test, and the average benefits test. To pass these tests with an owner-favored allocation, the combined plan typically must clear a "gateway minimum" — usually 7.5% of pay for non-highly-compensated employees, contributed through the profit-sharing component of the 401(k).
For a solo practitioner or a partnership where every partner is a high earner, the gateway minimum costs nothing — there are no NHCEs to fund. For a five-person practice with three rank-and-file staff, the 7.5% employer contribution on staff pay can run $20,000 to $40,000 per year. That cost is real, but it is almost always small relative to the deduction it unlocks for owners — and the staff contribution is itself fully deductible to the business.
The genuine break-even question is not "do I have employees?" but "how does my staff cost compare to my owner deduction value?" For owners with high household marginal rates and a small NHCE base, the answer is almost always favorable.
Worked Example: SEP vs. Layered Structure
"Linda," Charlotte Specialty Practice Owner, Age 54
Linda runs an S-corp specialty practice (an SSTB) with $1.2M of revenue and $480,000 of net income to the owner. She has two part-time staff. She files jointly; her spouse earns $95,000 as a W-2. Currently she contributes the maximum to a SEP-IRA: $72,000 for 2026. Household taxable income lands around $480,000 — squarely in the SSTB phase-out band, with most of the QBI deduction already lost.
Current SEP-IRA contribution: $72,000
Federal + NC tax savings on $72K (~42%): ~$30,200
Switching to a layered 401(k) profit-sharing plus cash balance plan, designed by an actuary for her age and compensation:
401(k) deferral + age-50 catch-up: $32,500
Profit-sharing layer (capped at 6%): ~$21,000
Cash balance pay credit (age 54): ~$225,000
NHCE gateway contribution (2 staff): ~$11,000
Total owner pre-tax compression: ~$278,500
Federal + NC tax savings (~42% blended): ~$117,000
Less: actuarial and TPA fees: ~$5,000
Net incremental annual savings vs. SEP: ~$82,000
Beyond the direct deferral arithmetic, the larger contribution drops Linda's household taxable income below $403,500 (MFJ), restoring the full QBI deduction on her remaining qualified business income — typically another $10,000 to $25,000 of federal tax savings depending on the QBI base. Over a five-year run before sale or wind-down, the cumulative pre-tax shelter exceeds $1.4 million.
Illustration only. Actual cash balance contribution depends on actuarial assumptions and plan-specific factors. Reasonable W-2 compensation must support any §415-driven accrual. Plan must be maintained for a meaningful period (typically five years) to avoid IRS scrutiny.
Wind-Down, Freezes, and the Five-Year Rule
Before any of the wind-down questions matter, there is a front-end timing reality: a cash balance plan requires lead time. Actuarial design, plan document drafting, and adoption paperwork take weeks, not days — and if you wait until December to start the conversation, you have usually missed the year, while starting in October typically captures it. Cash balance plans are not free to walk away from either. Three points that matter at the front end and the back end of the plan's life:
- Funding obligation. Unlike a 401(k), where contributions are discretionary, a defined benefit plan creates a legal funding obligation. In a down year, the owner is still required to fund the actuarially determined contribution, or formally amend the plan before the plan year ends.
- The five-year norm. The IRS expects defined benefit plans to be established with a "permanent" intention. While there is no hard statutory minimum, a plan terminated in fewer than five years without a legitimate business reason can draw scrutiny and risk disqualification of past deductions. Most actuaries design with a five-to-ten year horizon in mind.
- Freeze before terminate. Owners with changing circumstances often "freeze" the plan — stopping new accruals while leaving the trust in place — for a year or two before terminating. A freeze preserves prior deductions, eliminates the funding obligation going forward, and provides a softer landing than an abrupt termination. It is the standard exit ramp.
- PBGC exemption. Plans that cover only the business owner (and spouse) are exempt from Pension Benefit Guaranty Corporation premiums and oversight. Once the plan covers a single non-owner employee, PBGC coverage typically applies, which adds modest annual premiums (currently around $106 per participant, plus a variable-rate premium tied to any unfunded vested benefits) and reporting.
Frequently Asked Questions About Cash Balance Plans in 2026
What is the 2026 cash balance plan contribution limit?
There is no flat dollar cap. Contributions are actuarially derived and depend on age, compensation, and plan design, working backward from the §415(b) defined benefit annual benefit limit, which rises to $290,000 for 2026. Owners in their 40s typically see capacity in the $130,000 to $160,000 range; owners in their 60s often clear $275,000 to $290,000.
Can I have both a 401(k) and a cash balance plan?
Yes. The two plans are designed to work together. When a cash balance plan is layered on top of a 401(k) profit-sharing plan, the profit-sharing component is capped at 6% of compensation under combined-plan rules — but the cash balance layer typically adds far more capacity than that 6% cap removes.
Do I have to contribute every year?
Yes — a cash balance plan is a defined benefit plan, so annual funding is a legal obligation, not discretionary. In a low-income year, owners typically amend the plan before year-end to lower the accrual, or formally freeze the plan to halt future accruals while preserving prior deductions.
How do cash balance plans interact with the QBI deduction?
Cash balance contributions reduce taxable income, which is the only effective lever SSTB owners have to preserve the §199A QBI deduction above the $403,500 (MFJ) phase-out threshold. For owners pushed above the upper threshold, a properly sized cash balance plan can restore tens of thousands of dollars of QBI deduction in addition to the direct tax savings on the contribution itself.
What happens to a cash balance plan when I sell or wind down the business?
At plan termination, accrued balances are distributed — almost always rolled to an IRA, with no current tax. Most owners freeze the plan for a year or two before terminating, which stops new accruals and the funding obligation while preserving the deductions already taken. Early termination without a legitimate business reason can draw IRS scrutiny, so the plan should be designed with a five-year-plus horizon in mind.
For owners earning $350,000 and up, the SEP-IRA stops being the right answer somewhere in their mid-40s — and for owners pushed above the §199A threshold, it stopped being the right answer the moment they crossed it. A properly designed cash balance plan, layered with a 401(k) profit-sharing structure, is one of the few remaining tools in the code that lets a high-income owner shelter $200,000 to $300,000 of income annually, on a fully deductible basis, year after year.
If you want to know whether the math works for your situation, that is a conversation we have with our owner clients each fall — well in advance of the December 31 plan adoption deadline.
This article is for educational purposes only and does not constitute individualized tax, legal, or investment advice. Tax law and inflation-adjusted thresholds are current as of the 2026 tax year (IRS Notice 2025-67) and may change. Cash balance plan contribution capacity is actuarially determined and varies materially by plan design. Consult with a qualified advisor and ERISA actuary regarding your specific situation. Llewellyn Financial is a fee-only, fiduciary RIA based in Charlotte, NC.
