Self-Employed Retirement Plans: SEP-IRA vs Solo 401(k) vs SIMPLE IRA in 2026

If you are a freelancer, independent contractor, or small-business owner without a traditional workplace plan, the retirement savings landscape can feel both liberating and a little overwhelming. There is no HR department enrolling you automatically, and no default contribution rate doing the work quietly in the background. But that also means you have genuine choices, and the contribution limits available to self-employed workers are, in some cases, far higher than what W-2 employees can access through a standard 401(k).

This guide focuses on the three plans most commonly used by self-employed individuals: the SEP-IRA, the Solo 401(k), and the SIMPLE IRA. Using 2026 numbers, we will walk through how each plan works, what it costs to run, who tends to gravitate toward each option, and how the numbers play out in a real-world scenario. Whether you are a graphic designer billing $60,000 a year or a consultant clearing $200,000, the comparison below is designed to help you ask the right questions before you sit down with a financial adviser.

Before comparing dollar amounts, it helps to understand what each plan actually is and who can use it.

SEP-IRA (Simplified Employee Pension Individual Retirement Arrangement)
A SEP-IRA is funded entirely by employer contributions. When you are self-employed, you are both the employer and the employee, so you make contributions in your capacity as the employer. There are no employee salary-deferral contributions under a SEP-IRA. The plan is easy to open at most major brokerages, requires no annual IRS filing for most participants, and can be established as late as your tax-filing deadline (including extensions) for the prior year. If you have employees other than yourself, you are generally required to contribute the same percentage of compensation for all eligible employees, which can make the SEP-IRA costly for businesses with staff.

Solo 401(k), also called Individual 401(k) or One-Participant 401(k)
The Solo 401(k) is available only to self-employed individuals with no full-time employees other than a spouse. It mirrors the structure of a standard workplace 401(k): you contribute as the employee through salary deferrals, and then contribute again as the employer through a profit-sharing contribution. This two-layer structure is what allows the Solo 401(k) to reach higher totals at moderate income levels. Roth contributions are available in the employee-deferral portion, which can be a meaningful advantage for those managing long-term tax strategy. Plans established at certain brokerages may require an IRS Form 5500-EZ filing once plan assets exceed $250,000.

SIMPLE IRA (Savings Incentive Match Plan for Employees)
The SIMPLE IRA is designed for small businesses with 100 or fewer employees. Self-employed individuals can use it, but the plan requires a mandatory employer contribution: either a matching contribution of up to 3% of compensation or a flat 2% non-elective contribution for all eligible employees. If you have employees, this plan locks you into making contributions on their behalf regardless of whether they choose to participate. For a sole proprietor with no employees, the SIMPLE IRA can work, but its contribution limits are lower than the other two options, and its administrative rules are more rigid in some respects.

Contribution limits for retirement plans are adjusted periodically by the IRS for inflation. The figures below reflect the limits for 2026 as announced by the IRS. Always verify current limits directly at irs.gov, as amounts can change each year.

SEP-IRA (2026)

• Maximum contribution: the lesser of 25% of net self-employment income (after the deduction for half of self-employment tax) or $70,000
• No catch-up contributions for those aged 50 and older
• No Roth option within the SEP-IRA structure itself (though a separate Roth IRA can be funded independently, subject to income limits)

Solo 401(k) (2026)

• Employee salary-deferral limit: $23,500
• Catch-up contribution for ages 50-59 and 64+: an additional $7,500, bringing the deferral limit to $31,000
• SECURE 2.0 super catch-up for ages 60-63: an additional $11,250 above the base limit, for a deferral total of $34,750
• Employer profit-sharing contribution: up to 25% of net self-employment compensation
• Combined employee plus employer limit: the lesser of $70,000 (or $77,500 with standard catch-up, or $81,250 with the super catch-up) or 100% of compensation
• Roth contributions permitted on the employee-deferral portion

SIMPLE IRA (2026)

• Employee salary-deferral limit: $16,500
• Catch-up contribution for ages 50+: an additional $3,500, for a total of $20,000
• SECURE 2.0 enhanced catch-up for ages 60-63: an additional $5,250 above the base limit
• Mandatory employer match: up to 3% of compensation (matching) or 2% non-elective
• Roth SIMPLE IRA contributions are now permitted under SECURE 2.0, though availability depends on the plan provider

If you are interested in how catch-up contribution rules have evolved under SECURE 2.0, the new Roth catch-up rules for high earners explain the broader landscape of these changes in detail.

Numbers on a page are easier to absorb when they are attached to a scenario. Consider a hypothetical freelance consultant, call her Maria, who is 45 years old, files as a sole proprietor, and has net self-employment income of $120,000 in 2026. This example is illustrative only and does not represent a specific individual's circumstances.

Maria's net earnings from self-employment, after deducting half of her self-employment tax (approximately $8,478 at current rates), works out to roughly $111,522 for plan contribution calculation purposes. Here is how her maximum annual retirement contribution differs by plan type:

• SEP-IRA: 25% of $111,522 = approximately $27,881
• Solo 401(k): $23,500 employee deferral + 25% of $111,522 employer contribution = approximately $51,381
• SIMPLE IRA: $16,500 employee deferral + 3% employer match of $120,000 = approximately $20,100

The difference between the SEP-IRA and the Solo 401(k) at this income level is approximately $23,500, the full value of the employee salary-deferral layer that only the Solo 401(k) provides. For someone in the 22% or 24% federal tax bracket, that additional deferral could reduce the current-year federal tax bill by $5,170 to $5,640, before any state income tax savings.

At higher income levels, the gap between the SEP-IRA and Solo 401(k) eventually narrows. Once the combined employer contribution alone reaches $46,500 (the difference between the $70,000 total cap and the $23,500 deferral), both plans hit the same ceiling. That crossover happens at net self-employment income of roughly $186,000 or higher. Above that level, the SEP-IRA and Solo 401(k) reach a similar maximum, though the Solo 401(k) still offers the Roth deferral option, which can be a meaningful planning tool.

For context on how tax-deferred savings today can compound into meaningful retirement income, it may be worth exploring how retirement savings benchmarks by age stack up against typical accumulation targets.

Contribution limits matter, but the day-to-day realities of running a plan matter too. Here is how the three options compare on the practical side.

SEP-IRA: Lowest Friction
Opening a SEP-IRA involves completing IRS Form 5305-SEP or a brokerage's equivalent simplified form. There is no annual filing requirement with the IRS for most sole proprietors, and contributions can be made up to the tax-filing deadline including extensions (October 15 for most sole proprietors who file an extension). The simplicity is genuine. The trade-off is that there is no Roth option and no loan provision.

Solo 401(k): More Power, Slightly More Paperwork
Solo 401(k) plans must generally be established by December 31 of the plan year (though SECURE 2.0 extended this deadline for new plans established after 2022, allowing establishment up to the tax-filing deadline). Once plan assets exceed $250,000, an annual IRS Form 5500-EZ must be filed. Many brokerage-provided Solo 401(k) plans are prototype or pre-approved plans, meaning the brokerage handles the plan document. Self-employed individuals should confirm with their provider whether the plan supports Roth deferrals and, if applicable, loans, since not all prototype plans include these features. Solo 401(k) plans also typically do not permit employees other than a spouse, so growth beyond a one-person operation can require converting to a different plan structure.

SIMPLE IRA: Rigid Calendar, Mandatory Employer Cost
The SIMPLE IRA has a strict setup window: it must generally be established by October 1 of the year it is first effective. The mandatory employer contribution is a meaningful commitment. If business income fluctuates year to year, the 3% matching option provides some flexibility (there are rules allowing reduction in certain years), but the 2% non-elective contribution applies to all eligible employees regardless of whether they defer. For a sole proprietor with no employees, this mandatory cost is simply the employer contribution to yourself, which is effectively a forced savings mechanism rather than a cost. However, if employees are added later, the plan's cost structure changes materially.

One of the most significant shifts in recent years is the expanded availability of Roth contributions across retirement plan types, driven largely by the SECURE 2.0 Act of 2022.

The Solo 401(k) has long permitted Roth deferrals on the employee portion of contributions, meaning self-employed individuals can contribute after-tax dollars that grow tax-free and are withdrawn tax-free in retirement. This can be attractive for those who expect to be in a higher tax bracket in retirement, or for those pursuing a Roth conversion strategy. Roth SIMPLE IRA contributions are now also permitted under SECURE 2.0, though plan providers are still rolling out this capability, and availability varies.

The SEP-IRA does not permit Roth contributions within the plan itself. However, under SECURE 2.0, a SEP-IRA can now receive Roth contributions if the plan documents allow it and the plan provider supports it. As of 2026, this feature is not yet widely available across major brokerages, so it is worth confirming directly with your provider if this matters to your planning.

For those weighing whether to prioritize pre-tax or Roth contributions, the calculus often involves current versus expected future tax rates, state tax considerations, and legacy planning goals. The relationship between Roth strategies and Medicare premiums later in life is also worth understanding: the IRMAA trap explains how higher income in retirement can trigger surcharges on Medicare costs, and why some savers prefer to build Roth balances to manage that exposure.

No single plan is universally superior, and the right fit depends on factors including income level, business structure, whether employees are involved, and how much administrative complexity is acceptable. Below is a general framework based on commonly discussed criteria. This is educational information, not a personalised recommendation.

The SEP-IRA tends to attract attention when:

• A self-employed individual wants a simple, low-maintenance plan with minimal paperwork
• Net income is high enough that the 25%-of-compensation employer contribution alone reaches the desired savings level
• The business is in early stages and flexibility on the setup deadline is valued
• There are no employees (or if there are, the business owner is prepared for the cost of contributing proportionally for all eligible staff)

The Solo 401(k) tends to attract attention when:

• Net income is below roughly $186,000 and the additional employee salary-deferral layer meaningfully increases the annual contribution
• Roth contributions are a priority for long-term tax diversification
• The business is a one-person operation or involves only a spouse as an employee
• The self-employed individual is in the 60-63 age range and wants to take advantage of the SECURE 2.0 super catch-up, which allows an additional $11,250 above the base deferral limit

The SIMPLE IRA tends to attract attention when:

• A small business has employees and wants a straightforward plan that covers the entire team
• The business owner is comfortable with the mandatory employer contribution structure
• Contribution amounts that are lower than a Solo 401(k) or SEP-IRA are acceptable for the current phase of the business
• The plan needs to be in place by October 1 of the effective year

One nuance worth noting for those who already have a SEP-IRA and are considering switching: you can generally open a Solo 401(k) for a future year and roll existing SEP-IRA balances into it. A tax professional or financial adviser can help structure that transition correctly, particularly around timing and plan document requirements.

Self-employed retirement planning does not exist in isolation. For those who also receive income from a former employer with a pension, the coordination of multiple income sources adds another layer. The article on coordinating a pension and a 401(k) touches on principles that can also apply when managing multiple retirement accounts simultaneously.

Disclaimer: The content in this article is provided for general educational and informational purposes only. It does not constitute personalised financial, tax, or legal advice. Contribution limits, tax rules, and plan regulations are subject to change. All figures referenced should be verified at irs.gov or with a qualified professional. Before opening a self-employed retirement plan or making contribution decisions, consult a qualified financial adviser, CPA, or tax professional who can evaluate your specific circumstances.