Cash Balance Plan vs. SEP-IRA
The SEP-IRA is usually where self-employment starts, since it is simple, cheap, and needs no annual filing. Past a certain income it leaves a large deduction unused every year. This guide covers when to move on.
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- Plan Comparison
- What you get
- A sourced guide to the rules, fit, and trade-offs behind this question.
- Next step
- Use the guide below to understand the fit, then choose the calculator or conversation that matches your question.
Reviewed by Alexander Tecle, MBA, MS Taxation
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Ongoing obligations
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| Feature | SEP-IRA | Cash balance plan (+401(k)) |
|---|---|---|
| 2026 maximum | Lesser of 25% of compensation or $72,000 | Actuarial — commonly $100,000–$300,000+ plus the 401(k) stack |
| Age sensitivity | None — same cap at 35 or 60 | Central — capacity climbs every year |
| Employees | Must receive the owner's same percentage of pay | Receive a tested allocation, often a single-digit percentage of pay |
| Commitment | None — skip any year | Annual funding expectation |
| Setup & admin | Minutes; no annual filing | Plan document, actuary, Form 5500 |
| Roth employee deferrals | Not available | Available through the paired 401(k) |
A SEP-IRA is popular for good reasons: it takes minutes to open, has no annual filing, and allows contributions up to 25% of compensation. Its ceiling ($72,000 for 2026) is the same flat cap regardless of your age, though, and one rule is expensive with staff: every eligible employee must receive the same contribution percentage the owner takes.
A cash balance plan inverts both weaknesses: contributions grow with age far beyond the SEP cap, and employee costs are set by testing rather than by matching your own percentage. The price is commitment and administration.
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Calculators
| Limit | 2026 | 2025 |
|---|---|---|
| 401(k) / 403(b) employee contribution | $24,500 | $23,500 |
| Catch-up contribution (age 50+) | $8,000 | $7,500 |
| Higher catch-up (ages 60–63)Unchanged for 2026 (SECURE 2.0). | $11,250 | $11,250 |
| Total additions to a defined contribution plan — IRC 415(c)Employer + employee; excludes age-based catch-up. | $72,000 | $70,000 |
| SEP-IRA maximum (lesser of 25% of compensation or this) | $72,000 | $70,000 |
| SIMPLE IRA employee contributionUp to $18,100 for certain small employers (SECURE 2.0). | $17,000 | $16,500 |
| Traditional / Roth IRA contribution | $7,500 | $7,000 |
| IRA catch-up (age 50+) | $1,100 | $1,000 |
Official IRS figures for 2026. Source: IRS Notice 2025-67 (IR-2025-111).
The head-to-head
The table above compares the two plans at a glance; the rest of this guide covers when to move and what changes when you do.
The employee rule that changes the math
For a solo owner, the SEP's pro-rata rule costs nothing. Hire two staff and it becomes the most expensive sentence in the plan: an owner contributing 25% of their own pay must contribute 25% of pay for every eligible employee. A cross-tested cash balance + 401(k) design typically covers the same staff at a mid-single-digit percentage of pay while the owner's allocation runs far higher, which is why growing practices leave the SEP even before the contribution cap starts to bind.
When to stay with the SEP
Keep the SEP while it still fits: profits under roughly $200,000, no employees on the horizon, income too irregular to promise annual funding, or a season of life where you value zero administration over a larger deduction. A Solo 401(k) is often the better intermediate step even then — it reaches the same dollar cap at lower income levels and adds employee Roth deferrals and catch-up contributions the SEP lacks.
Switching from a SEP
Graduating is straightforward: adopt the new plan, stop SEP contributions going forward, and roll or leave the SEP balance as suits your investments. Your administrator will manage one technical point. A SEP funded on the model Form 5305-SEP document generally can't be maintained in the same year as a qualified plan, so the switch is coordinated at year boundaries. With the retroactive-adoption rules, a strong year can end with the cash balance deduction even if it began with SEP intentions.
Choose the new design
Confirm that contribution goals, employees, and income stability justify leaving the SEP.
Adopt the new plan
Put the qualified plan in place under the applicable adoption rules.
Stop SEP contributions
End new SEP funding and coordinate the change when the SEP document bars same-year maintenance.
Handle the old balance
Keep or roll the existing SEP balance according to the chosen investment approach.
Frequently asked questions
How much more can I contribute with a cash balance plan than a SEP?
The SEP stops at $72,000 for 2026. A cash balance plan plus a 401(k) commonly supports two to five times that for owners in their late 40s through 60s, because the pension funds an age-driven benefit instead of a flat cap.
Can I keep my SEP-IRA and add a cash balance plan?
The balances can stay invested where they are, but ongoing SEP contributions generally end when the qualified plan begins — model-form SEPs can't run alongside one in the same year. Your administrator coordinates the handoff.
I have employees. Is the SEP that expensive?
Usually, yes. The SEP requires the same contribution percentage for every eligible employee as the owner takes. A tested cash balance design typically covers staff at a fraction of that while the owner contributes far more.
SEP-IRA vs. Solo 401(k): which should a solo owner choose?
For most solo owners the Solo 401(k) wins: it reaches the same $72,000 ceiling at a lower income because it combines a $24,500 employee deferral with a 25% employer contribution, and it adds Roth deferrals, the age-50 catch-up, and loans that a SEP lacks. The SEP still wins on simplicity: no plan document and never a Form 5500. A Solo 401(k) needs a plan document and must file Form 5500-EZ once its assets pass $250,000. The cash balance conversation begins when even the Solo 401(k) ceiling binds.
Sources
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See what the pension layer adds
Compare the 401(k)-only figure with the combined design at your age and income. Both numbers are modeled illustrations, not quotes.
This guide is educational and is not individualized tax, legal, or investment advice. Contribution limits and tax rules change annually and depend on your specific situation; figures are illustrative. Consult a qualified professional before acting.