A keogh retirement plan is a tax-deferred retirement account designed for self-employed people and unincorporated businesses. It was named after Eugene Keogh, the U.S. congressman who sponsored the legislation creating it in 1962. Today, most banks and brokers offer these accounts under a different label: the Solo 401(k) or individual 401(k).
The problem is that many freelancers and small business owners have never heard of it, or assume it died with the 1960s. That confusion costs real money in missed deductions. This guide covers how the plan works, who qualifies, the contribution limits, and the practical steps to open one.
What Is a Keogh Retirement Plan and Who Qualifies?
A keogh retirement plan is a qualified retirement vehicle for self-employed individuals and unincorporated businesses, such as sole proprietors and partnerships. The IRS no longer uses the "Keogh" name in its current guidance, but the underlying account types remain fully available.
To qualify, you generally need self-employment income from a business you own. Employees of your own business may also need to be covered under certain plan designs, which is a key distinction from a Solo 401(k) that requires no employees other than a spouse.
There are two main structures to understand:
- Defined contribution versions — profit-sharing and money purchase plans, where contributions are fixed or discretionary
- Defined benefit versions — a pension-style plan that promises a specific benefit at retirement, often allowing much larger deductions for older owners
The defined benefit route is where a keogh retirement plan can outperform simpler options. According to the IRS, defined benefit plans can allow contributions far above the standard elective deferral limits because the cap is based on the benefit you'll receive, not a flat dollar figure.
How to apply this: Pull your most recent Schedule C or partnership K-1 and confirm you have net self-employment income. That figure is the starting point for every contribution calculation.
How Much Can You Contribute to a Keogh Retirement Plan?
Contribution limits for a keogh retirement plan depend on the plan type and your net self-employment earnings. For defined contribution plans, the IRS publishes annual limits on total contributions, and those figures are adjusted periodically for inflation.
For a defined benefit keogh plan, the ceiling is actuarially determined. A 55-year-old with strong net income can often deduct substantially more than a 35-year-old with the same earnings, because the calculation targets a benefit payable at retirement age.
Here's how the main structures compare:
| Plan type | Contribution basis | Best for | Action to take |
|---|---|---|---|
| Profit-sharing Keogh | Discretionary % of net earnings | Variable income | Set a contribution target each December |
| Money purchase Keogh | Fixed mandatory % | Stable, predictable income | Confirm you can fund it every year |
| Defined benefit Keogh | Actuarial benefit target | Older owners, high income | Hire an actuary for the calculation |
| Solo 401(k) equivalent | Elective deferral plus employer share | Solo owners, no staff | Compare against your Keogh quote |
One practical caution: mandatory contributions in a money purchase plan must be funded annually, and missed contributions create IRS correction work. Discretionary profit-sharing plans give you more flexibility in lean years.
How to apply this: Ask your custodian for a written projection of the maximum deductible contribution under each structure before you commit to a plan document.
The Best Accounts and Tools for Opening a Keogh Retirement Plan
Most major brokerages now deliver keogh-style accounts through their individual 401(k) product line. The account mechanics are nearly identical, but fees and investment menus vary widely.
Three real options worth comparing:
- Fidelity — offers self-employed 401(k) accounts with no annual account fee and a broad fund lineup; a solid default for low-cost index investing
- Vanguard — known for low expense ratios and simple plan administration, though small-business plan support is more limited than some competitors
- Schwab — provides solo 401(k) accounts with no setup or annual fees and access to its full brokerage platform
For the defined benefit version, you'll typically need a third-party administrator or actuary rather than a retail brokerage, since the plan requires annual actuarial certification. Expect setup and administration costs that scale with plan complexity.
Whichever custodian you choose, verify two things before signing: whether the plan document permits the contribution level you need, and whether the provider handles IRS Form 5500 filing once assets cross the reporting threshold.
How to apply this: Request the plan's fee disclosure document and compare total annual cost across at least two custodians before opening an account.
What Are the Rules and Deadlines You Must Follow?
A keogh retirement plan carries specific compliance obligations that catch self-employed owners off guard. The most common is the plan establishment deadline: you generally must adopt the plan by the end of the tax year, even though you can fund it after year-end.
Contribution deadlines differ by entity type. Sole proprietors typically have until the tax filing deadline, including extensions, to make contributions for the prior year. That flexibility is genuinely useful for owners whose income isn't clear until the books close.
Reporting requirements matter too. Once plan assets exceed the threshold the IRS sets for small plans, you must file Form 5500 annually. The IRS explains that failing to file can trigger significant penalties, so calendar the deadline rather than relying on memory.
A common scenario: a consultant opens a keogh plan in November, funds it in March, and then discovers the plan document required adoption by December 31 of the prior year. That sequencing error is avoidable with a simple checklist.
How to apply this: Write down three dates now — plan adoption deadline, contribution deadline, and Form 5500 due date — and put them in your business calendar with reminders 30 days early.
Keogh Retirement Plan vs. SEP IRA and Solo 401(k)
A keogh retirement plan is not always the right answer, and comparing it against modern alternatives is essential. The SEP IRA and Solo 401(k) have largely replaced it for most solo owners because they're simpler to administer.
The SEP IRA allows employer contributions only, with no employee elective deferrals. That makes it easy to run but caps how much a younger owner can shelter. The Solo 401(k) adds elective deferrals plus catch-up contributions for those 50 and older, which usually produces a higher total for the same income.
Where the keogh structure still wins is the defined benefit version. If you're in your late 50s with high, stable self-employment income, a defined benefit keogh plan can permit deductions that dwarf what a SEP IRA allows, because the limit is driven by the retirement benefit rather than a contribution ceiling.
The tradeoff is cost and complexity. Defined benefit plans need actuarial work, annual certifications, and a commitment to funding. For many owners, the administrative burden only makes sense above a certain income level.
| Feature | SEP IRA | Solo 401(k) | Defined benefit Keogh |
|---|---|---|---|
| Employee deferrals | No | Yes | No |
| Admin complexity | Low | Low | High |
| Actuary required | No | No | Yes |
| High-income deduction potential | Moderate | Moderate | High |
How to apply this: Model your maximum contribution under a SEP IRA and a Solo 401(k) first. Only pursue the defined benefit route if the projected deduction gap justifies the added cost.
Frequently Asked Questions About keogh retirement plan
Is a keogh retirement plan still legal today?
Yes, the structure remains legal, but the IRS now refers to these arrangements by their underlying plan types rather than the Keogh name. If you ask a custodian for a "Keogh," they'll likely point you to a Solo 401(k) or profit-sharing plan. The tax treatment hasn't changed.
One exception: some very old plan documents still carry the Keogh label and may need restating to comply with current regulations.
Can I open a keogh retirement plan if I have employees?
It depends on the plan design. A profit-sharing or defined benefit keogh retirement plan can cover employees, but you'll generally need to include eligible staff under nondiscrimination rules. A Solo 401(k) version is off the table if you have non-spouse employees. If you hire your first employee mid-year, review the plan document immediately rather than waiting for tax season.
What happens if I miss a required contribution?
Missing a mandatory contribution in a money purchase or defined benefit keogh retirement plan triggers IRS correction procedures, which can involve excise taxes and filing amended returns. Discretionary profit-sharing plans avoid this risk because contributions aren't required. If cash flow is unpredictable, choose a discretionary design or build a funding reserve before adopting a mandatory plan.
How does a keogh retirement plan interact with a SEP IRA I already have?
You can maintain both, but contribution limits are coordinated across plans you control as the same employer. You can't double up on the same dollar of net earnings. A common mistake is maxing out a SEP IRA and then assuming a keogh retirement plan allows a second full contribution. Aggregate the limits before funding either account.
Can I borrow from a keogh retirement plan?
Some qualified plans permit loans, but the plan document must explicitly allow them, and the IRS caps loan amounts and requires repayment terms. Many self-employed plan documents don't include a loan provision at all. If borrowing flexibility matters to you, confirm it in writing before opening a keogh retirement plan, because adding the feature later often means restating the document.
Conclusion
The keogh retirement plan remains a legitimate, tax-advantaged tool — just under a newer name in most cases. The key takeaways:
- Most self-employed owners today get the same benefit through a Solo 401(k) or profit-sharing plan
- The defined benefit version offers the largest deductions for older, high-income owners
- Plan adoption deadlines are stricter than contribution deadlines, so sequence matters
- Administrative cost and complexity should drive your choice as much as deduction size
Your next step: calculate your maximum contribution under a SEP IRA and a Solo 401(k) this week, then compare those numbers against a defined benefit projection from an actuary. That comparison tells you in one afternoon whether a keogh retirement plan is worth pursuing for your situation.
