What it is
TL;DRA cash balance plan is a hybrid defined-benefit plan that defines benefits as a stated account balance. Layered on top of a 401(k) profit-sharing plan, it lets older, higher-earning owners deduct $200k-$350k of retirement contributions in a single year.
The 401(k) profit-sharing plan caps out at $70,000 of total contributions in 2026 ($77,500 with catch-up). For a 55-year-old surgeon with $700,000 of self-employment income, that is not even a dent in the tax bill.
A cash balance plan stacked on top of the 401(k) raises that total to $250,000-$350,000+ depending on age and pay, all deductible against ordinary income.
Who it's for
High-earning owners over 45 with stable income, a small employee count, and the ability to commit to roughly five years of consistent funding.
- ✓Professional practice owners (doctors, dentists, attorneys) age 45+
- ✓Self-employed consultants with $400k+ in steady earnings
- ✓Small businesses with 1-10 employees where owners are materially older than staff
- ×Owners with highly volatile income, DB plans punish missed contributions
- ×Businesses where staff is the same age or older than the owners
- ×Owners not planning to keep the plan open at least 3-5 years
How it works
1. Design the contribution targets
An actuary models the owner's age, expected retirement age, and target benefit, and solves for the annual contribution that funds it within IRS limits.
Typical owner contributions: $130,000 at age 45, $220,000 at age 55, $300,000+ at age 60.
2. Layer the 401(k) profit-sharing plan
On top of the cash balance plan, run a safe-harbor 401(k) with a profit-sharing allocation. Owners can also defer the full elective limit and catch-up.
Total owner deductions can exceed $370,000 in a single year for a 60-year-old.
3. Satisfy nondiscrimination
Cash balance plans must satisfy §401(a)(4), §410(b), and §401(a)(26). Translation: rank-and-file employees must receive a meaningful contribution, typically 5-7.5% of pay.
Plan design, pay credits, vesting schedules, eligibility, gets you to the lowest defensible staff cost without breaking the tests.
4. Commit to consistent funding
Cash balance plans have annual minimum required contributions. Skipping them triggers excise taxes and, in extreme cases, plan termination penalties.
The IRS expects plans to be 'permanent.' A cash balance plan terminated in fewer than 3-5 years invites a determination that the plan was never qualified, with retroactive disallowance of every contribution.
A worked example
Dr. Patel is 56, owns a single-physician dermatology practice in St. George, takes $560,000 of W-2 from the corp, and has three employees aged 28, 33, and 41. Effective federal marginal rate ≈ 37%, Utah ≈ 4.65%.
| 401(k) profit-sharing only | Cash balance + 401(k) combo | |
|---|---|---|
| Owner retirement deduction | $73,500 | $278,000 |
| Employee contribution cost | $11,200 | $26,800 |
| Net owner deduction | $62,300 | $251,200 |
| Federal + state tax saved | $26,000 | $104,500 |
| Incremental tax saved (annual) | ≈ $78,500 |
Dr. Patel shelters another ≈ $205,000 a year, costs her ≈ $15,600 of incremental employee contribution, and saves roughly $78,500 in tax. Net annual benefit: about $63,000.
Limits and risks
Investment volatility matters. Cash balance plans guarantee a stated rate of return; if the trust earns less than the credited rate, the owner has to make up the shortfall. Conservative portfolios (4-5% target) are the norm.
Plans must be opened by year-end (or under SECURE 2.0, by the extended return due date for the first year), and funded by the corporate return's extended due date.
Plan termination is expensive, actuarial certifications, PBGC filings (for some plans), and Form 5310 determination if you want closure protection. Budget $8,000-$15,000.
The DOL audits plans, not the IRS. The two most common findings are late deposits of employee deferrals (must be the earliest date they can reasonably be segregated, typically within seven business days) and inadequate fidelity bond coverage.
IRS reference
- IRC §415(b)Maximum benefit limits for defined benefit plans.
- IRC §404(a)(7)Combined deduction limits for DB + DC plans.
- IRC §401(a)(26)Minimum participation rule, 40% of employees or 50, whichever is less.