Which plan lets me contribute the most?

For an owner with no employees, a solo plan allows more than a simplified employer pension because it combines an employee deferral with the employer contribution. To go higher, an older, high-income owner generally needs a defined-benefit or cash-balance plan, where the contribution is whatever an enrolled actuary certifies is required to fund the promised benefit rather than a flat contribution ceiling. The two designs can be layered, subject to the combined-plan limits and annual testing.

What changes once I have employees?

Coverage and nondiscrimination rules generally require meaningful contributions for eligible employees, not for the owner alone, which can raise the total cost enough to change which design makes sense. The plan has to be tested each year against employee census data, and its operation is reported on the annual Form 5500 series return. Design choices such as a safe harbor contribution, or separate allocation groups in a cash-balance plan, are how a plan passes testing while still favoring the owner within the rules.

Can I skip a contribution in a bad year?

It depends on the plan type. Profit-sharing and other discretionary defined-contribution contributions can generally be reduced or skipped for a lean year. A defined-benefit or cash-balance plan carries a minimum funding requirement certified each year by an enrolled actuary, and missing it creates a funding deficiency that carries an excise tax, which is why these designs suit businesses with dependable cash flow.

Solo 401(k), SEP, defined benefit and cash balance plans

Retirement plan design uses employer-sponsored plans to convert business profit into deductible contributions that grow tax-deferred. A solo owner might choose a solo plan or a simplified employer pension; an older, high-income owner can often contribute far more through a defined-benefit or cash-balance plan. The right design depends on your age, income, and whether you have employees.

Verify annually — figures adjust

The contribution and benefit limits for these plans adjust each year, so confirm the current figures before relying on them.

Requires capital outlay

These plans require real cash — the deduction equals the contribution actually made, so the strategy only works if the business funds it. Defined-contribution plans are inexpensive to administer; defined-benefit and cash-balance plans cost more and demand a recurring, actuarially determined contribution.

Key points

An employer retirement plan turns business profit into a deduction equal to the contribution actually made, and the money grows tax-deferred until retirement.
A solo plan combines an employee deferral with an employer contribution, so it usually allows more than a simplified employer pension alone.
In a defined-benefit or cash-balance plan an enrolled actuary certifies the contribution required, which is largest for an older owner nearing retirement.
A defined-benefit or cash-balance plan creates a recurring funding obligation that must be met even in a lean year.
Coverage and nondiscrimination rules generally require meaningful contributions for eligible employees, so a plan cannot benefit the owner alone.

What is it?

An employer retirement plan lets your business deduct the contributions it makes on behalf of you and your employees, while the money grows tax-deferred until it is drawn in retirement. For an owner, this turns a slice of current profit into a deduction now and a retirement asset later. The design question is which plan captures the largest sensible contribution for your situation.

For a business with no employees other than the owner and a spouse, a solo plan combines an employee deferral with an employer contribution, often allowing a larger total than a simplified employer pension, which relies on the employer contribution alone. Both are straightforward to run. As profit and the desire to contribute grow, these defined-contribution plans eventually reach their ceiling.

A defined-benefit plan, and its cash-balance cousin, work from the opposite direction: they define the retirement benefit and then require whatever contribution funds it. Because an older owner has fewer years to fund a given benefit, the annual deductible contribution can be substantially larger than any defined-contribution plan permits. This makes defined-benefit and cash-balance designs the tool of choice for older, high-income owners who can commit significant, recurring cash.

These plans can be layered. A cash-balance plan is frequently paired with a solo or profit-sharing plan so that the two together capture more than either alone, subject to combined-plan limits and testing. The trade-off is complexity, cost, and a funding commitment that is difficult to reverse.

Statutory basis

Who does it apply to?

Owners with strong, stable profit who want to convert a large amount of it into deductible, tax-deferred retirement savings.

Older, high-income owners with few or no employees, for whom a defined-benefit or cash-balance plan can support unusually large contributions.

Established businesses able to commit recurring cash to a funding obligation, especially where a defined-benefit design is involved.

Who does it not work for?

Businesses with irregular or thin profit, since a defined-benefit or cash-balance plan creates a recurring funding obligation that must be met even in a lean year.
Owners with employees who assume the plan benefits only themselves — coverage and nondiscrimination rules generally require meaningful contributions for staff, which can change the economics entirely.
Younger owners seeking the very largest deduction, for whom a defined-benefit plan funds a smaller annual contribution because there are many years left to fund the benefit.
Owners who cannot commit the cash, since the deduction requires an actual contribution and a defined-benefit obligation cannot simply be skipped when money is tight.

What does the IRS look at?

Whether the plan passes coverage and nondiscrimination testing, so that it does not disproportionately favor owners over rank-and-file employees.
Whether contributions stay within the applicable limits for the plan type and, where plans are combined, the aggregate limits.
Whether a defined-benefit or cash-balance plan's contributions match the actuary's certified funding requirement.
Whether contributions were actually made by the applicable deadline, not merely accrued on paper.
Whether the plan document is current and has been operated in accordance with its terms.

What does it cost to fund, and when does the window close?

A defined-benefit or cash-balance plan's contribution is calculated by an enrolled actuary, who certifies the funding requirement each year and helps the plan pass coverage and nondiscrimination testing; a third-party administrator typically handles the annual filings. Contributions are generally deductible for a year if made by the extended due date of that year's return, but the plan itself must usually be established before year-end, so the design work belongs well ahead of filing.

Related strategies

Common questions

Which plan lets me contribute the most?: For an owner with no employees, a solo plan allows more than a simplified employer pension because it combines an employee deferral with the employer contribution. To go higher, an older, high-income owner generally needs a defined-benefit or cash-balance plan, where the contribution is whatever an enrolled actuary certifies is required to fund the promised benefit rather than a flat contribution ceiling. The two designs can be layered, subject to the combined-plan limits and annual testing.
What changes once I have employees?: Coverage and nondiscrimination rules generally require meaningful contributions for eligible employees, not for the owner alone, which can raise the total cost enough to change which design makes sense. The plan has to be tested each year against employee census data, and its operation is reported on the annual Form 5500 series return. Design choices such as a safe harbor contribution, or separate allocation groups in a cash-balance plan, are how a plan passes testing while still favoring the owner within the rules.
Can I skip a contribution in a bad year?: It depends on the plan type. Profit-sharing and other discretionary defined-contribution contributions can generally be reduced or skipped for a lean year. A defined-benefit or cash-balance plan carries a minimum funding requirement certified each year by an enrolled actuary, and missing it creates a funding deficiency that carries an excise tax, which is why these designs suit businesses with dependable cash flow.

Mena Hemaia, CPA, CIA

Chief Executive Officer, Accountack — West Palm Beach, Florida

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