Cash Balance Plans for S-Corp Owners

An S-Corp owner is an employee of their own corporation, paid a W-2 salary, with remaining profit flowing through on Schedule K-1. Qualified retirement plans are employer-sponsored by design: the S-Corp adopts the plan, the S-Corp makes the contributions, and the S-Corp takes the deduction, which then flows through the K-1 and reduces the owner's taxable pass-through income.

The salary you already pay yourself to satisfy the IRS's reasonable-compensation requirement is the same number that unlocks 401(k) deferrals, profit sharing, and an actuarially sized cash balance contribution.

Plan compensation for an S-Corp owner is W-2 wages only. K-1 distributions do not count toward any retirement-plan calculation, no matter how large the business's profit is. An owner taking a $60,000 salary and $500,000 in distributions is, for pension purposes, a $60,000 earner.

The IRS also caps how much compensation any plan may count, at $360,000 for 2026 under IRC 401(a)(17) (see the limits table above). Between those two facts sits the design question every S-Corp owner faces: what W-2 level satisfies reasonable compensation, keeps payroll taxes sensible, and funds the contribution you want. There is a sweet spot: Social Security tax stops at the wage base ($184,500 for 2026), so W-2 dollars above that line cost only Medicare while still adding plan capacity. Model the trade-off with the payroll tax calculator linked above.

A complete owner-benefit design layers up to four deductible pieces on the same W-2. The 401(k) deferral comes out of your own paycheck; everything else is a corporate contribution.

For an owner of 55 with a $300,000 W-2, the 2026 stack runs as follows, with the cash balance line taken from the contribution engine behind our calculator: a $24,500 pre-tax deferral; the $8,000 age-50 catch-up, which must be Roth because prior-year FICA wages exceeded $150,000 (this illustration assumes they did); a 3% safe-harbor nonelective contribution of $9,000; 3% profit sharing of $9,000, bringing employer 401(k) money to the 6% line; and a $262,428 cash balance contribution. That is $312,928 in total, of which $304,928 is deductible.

An employee of 32 earning $55,000 in the same plan receives the 3% safe harbor ($1,650) plus a 4.5% gateway profit-sharing allocation ($2,475), or $4,125, on top of whatever they choose to defer from their own pay. In this illustration staff are covered through the 401(k) side only; some designs add a small cash balance pay credit for staff instead, and the actuary's testing on the actual census decides the split.

The corporate pieces (profit sharing, the cash balance contribution, and any 401(h) funding) are deducted by the S-Corp on its own return (line 17 of Form 1120-S), which reduces the ordinary business income flowing to you on Schedule K-1. The deduction reaches you in that order. The corporation deducts the contribution, your K-1 income falls, and your personal tax falls with it. The entity-by-entity deduction guide covers the mechanics for every structure.

Your own 401(k) deferral works differently. It is withheld from payroll, shows in Box 12 of your W-2, and lowers the taxable wages in Box 1; there is nothing to claim separately on your 1040. High earners have one carve-out: under SECURE 2.0, the age-based catch-up must be made as Roth (after-tax) once your wages cross the law's threshold, so it does not join the deductible total. A good illustration separates the deductible and Roth pieces explicitly.

When one employer sponsors both a defined benefit plan and a defined contribution plan, IRC 404(a)(7) applies a combined deduction limit — unless employer contributions to the DC plan stay within 6% of participant compensation. Employee deferrals don't count against the test, only employer money does.

Nearly every S-Corp combined design takes its shape from that rule: employer 401(k) money is deliberately held at 6% of W-2 so the full, much larger cash balance deduction survives untouched. Pushing profit sharing to 25% is a common way owners unintentionally cap their pension deduction; the two plans have to be designed together.

If the S-Corp has employees, the plan must pass IRS coverage and nondiscrimination testing, and eligible staff will generally receive contributions. Cross-tested designs use the age gap between an older owner and younger staff so the owner's share of total funding stays high — the orthodontist case study is a worked example of this design.

A spouse on bona fide W-2 payroll works in the other direction: their wages support their own deferral, profit sharing, and cash balance allocation, raising the household's total deductible contribution within the same plan.

The design pays off when the W-2 is large enough to carry it. Contribution capacity is computed from wages, so an owner paying a $60,000 salary has little to build on regardless of profit; the owners who benefit most run a W-2 in the $200,000–$360,000 range (the 2026 compensation cap), supported by profits well above it, and are old enough that the actuarial contribution is large. If that describes your payroll, run the calculator with your W-2, then have the design checked against your actual payroll and staff census before anything is signed.