The Best IRA for the Self-Employed: SEP vs SIMPLE vs Solo 401(k)

TL;DR: The three main retirement plan choices for a self-employed worker are the SEP IRA, the SIMPLE IRA, and the Solo 401(k). Which one wins depends on your income, whether you have employees, and whether you want a Roth option or the ability to borrow from the plan. A Solo 401(k) generally allows the largest contribution for an owner with no employees, a SEP IRA suits an employer who wants a simple employer-funded plan, and a SIMPLE IRA suits a small business under 100 employees whose staff want to defer their own pay.

The Three Options, and Which One Actually Wins

The self-employed have three realistic retirement plan choices, the SEP IRA, the SIMPLE IRA, and the Solo 401(k), and the one that wins for you depends on your income, whether you have employees, and whether a Roth option or a plan loan matters to you.

None of the three is a universal best answer. Each is built around a different structure: the SEP IRA and the SIMPLE IRA are both employer-sponsored IRAs with their own contribution rules, while the Solo 401(k) is a workplace-style 401(k) plan scaled down for an owner with no non-spouse employees. A sole proprietor with no staff who wants to save aggressively usually gets the most room from a Solo 401(k), because it layers an employee salary deferral on top of an employer contribution. A business owner with a handful of employees who wants the simplest plan to administer often lands on a SEP IRA. A small business with employees who want to defer their own pay, without the paperwork of a full 401(k), typically uses a SIMPLE IRA. This page sits inside our broader IRA investing education hub, alongside our guide to the types of IRA accounts for the fuller landscape these three plans fit into.

How the SEP IRA Works for the Self-Employed

A SEP IRA lets a self-employed business make an employer-only contribution of up to 25 percent of compensation or $72,000 for 2026, whichever is less, with no employee salary deferral and no catch-up contribution.

The Internal Revenue Service describes a SEP as a plan any employer, including a self-employed individual or sole proprietor, can establish, with contributions made directly to an IRA set up for each eligible employee, including the business owner. Contributions are employer contributions only. To be eligible, an employee generally must have reached age 21, worked for the employer in at least 3 of the last 5 years, and received at least $800 in compensation for 2026, though an employer may adopt less restrictive rules that cover more employees. The 25 percent calculation is applied against compensation capped at $360,000 for 2026. Because contributions come only from the employer side, a SEP IRA does not allow elective salary deferrals or age-based catch-up contributions, which is the main reason a Solo 401(k) can out-contribute a SEP at the same income level for an owner with no employees. A newer development worth flagging: a Roth SEP option is now permitted under the SECURE 2.0 Act for tax years beginning after 2022, if the plan arrangement provides for it, though this is a newer statutory feature and not every provider has built it into their paperwork yet. See our full breakdown of the SEP IRA for the eligibility and setup details.

How the SIMPLE IRA Works for a Small Self-Employed Business

A SIMPLE IRA lets an employee, including a self-employed owner, defer up to $17,000 in 2026, and requires the employer to add either a dollar-for-dollar match up to 3 percent of compensation or a flat 2 percent nonelective contribution for every eligible employee.

A SIMPLE IRA is only available to employers with 100 or fewer employees who earned at least $5,000 in compensation in the prior year. On the employee side, eligibility generally requires having earned at least $5,000 in any 2 prior years and being reasonably expected to earn $5,000 in the current year, though an employer can set less restrictive rules. The standard age-50 catch-up is $4,000 for 2026, rising to $5,250 for savers age 60 through 63. Certain small employers may offer a higher standard deferral limit of $18,100 for 2026, though the precise eligibility conditioning for that enhanced figure is not detailed further here.

The employer’s 2 percent nonelective contribution, when that formula is used instead of the match, is calculated on compensation up to the same $360,000 cap used for the SEP calculation. For a self-employed owner with a small staff, the SIMPLE trades a lower contribution ceiling than a SEP or Solo 401(k) for a lighter administrative load and a built-in way for employees to defer their own pay. Our full breakdown of the SIMPLE IRA covers the setup and testing rules in more depth.

How the Solo 401(k) Works for an Owner-Only Business

A Solo 401(k) lets a self-employed owner with no non-spouse employees contribute in two capacities, an employee elective deferral of up to $24,500 in 2026 plus an employer profit-sharing contribution, combined to the $72,000 annual-additions ceiling, or higher with a catch-up contribution.

Eligibility is narrow by design: a Solo 401(k), also called a one-participant 401(k), covers a business owner with no employees, or that person and a spouse, and the plan’s simplified testing advantage disappears the moment the business hires a non-spouse common-law employee. The dual-hat structure is the plan’s defining feature. The owner can defer up to the standard employee elective-deferral limit, the same $24,500 figure that applies to any 401(k) for 2026, and can also make an employer nonelective, or profit-sharing, contribution generally up to 25 percent of compensation using the self-employment earned-income computation. Combined, the two pieces cannot exceed the overall annual-additions ceiling of $72,000 for 2026, or $80,000 with the $8,000 age-50 catch-up added on top, or $83,250 for savers age 60 through 63 using the $11,250 catch-up available at that age band. Whether the plan offers a Roth option or plan loans depends entirely on the plan document, and not every provider’s paperwork includes both. Where loans are offered, they follow the same rule that applies to any 401(k), generally the lesser of $50,000 or 50 percent of the vested balance. That stands in contrast to the SEP and SIMPLE, where borrowing from the account is a prohibited transaction that can disqualify the IRA entirely. A Solo 401(k) business generally must file Form 5500-EZ once plan assets reach $250,000. See our full breakdown of the Solo 401(k) for the setup deadlines and plan-document checklist.

SEP vs. SIMPLE vs. Solo 401(k): The 2026 Numbers Side by Side

Dollar for dollar, the Solo 401(k) generally allows the largest contribution for an owner with no employees, because it stacks an employee deferral on top of an employer share, while the SEP and SIMPLE are each limited to a single contribution stream.

Feature (2026)	SEP IRA	SIMPLE IRA	Solo 401(k)
Contribution ceiling	Employer only, lesser of 25% of compensation or $72,000	Employee deferral up to $17,000, plus required employer match or nonelective contribution	Employee deferral up to $24,500, plus employer profit share, combined to $72,000
Age-50 catch-up	Not available, no elective deferrals	$4,000	$8,000, for a combined total up to $80,000
Catch-up, ages 60 to 63	Not available	$5,250	$11,250, for a combined total up to $83,250
Who contributes	Employer only	Employee deferral, plus employer match up to 3% of pay or 2% nonelective	Owner in two capacities, employee deferral and employer profit share
Employer eligibility	Any employer, including a sole proprietor	100 or fewer employees earning $5,000 or more	Owner-only, or owner and spouse, with no other employees
Roth option	Permitted under SECURE 2.0, plan-dependent	Not confirmed in sourced material for this comparison	Available if the plan document allows it
Plan loans	Not permitted, a prohibited transaction	Not permitted, a prohibited transaction	Possible if the plan allows, generally the lesser of $50,000 or 50% of vested balance

Who Should Pick Which Plan

Choose the SEP IRA if you want the simplest employer-funded plan and can live without a Roth option or loans, choose the SIMPLE IRA if your business has employees under the 100-employee threshold who want to defer their own pay, and choose the Solo 401(k) if you have no employees and want the highest possible contribution ceiling plus Roth and loan flexibility.

A SEP IRA fits a business that may have a few employees, wants a single annual employer contribution instead of ongoing payroll deferral administration, and does not need plan loans. Its tradeoff: every eligible employee gets the same percentage-of-pay contribution, which gets expensive as a staff grows. A SIMPLE IRA fits a small business, up to 100 employees, where staff want to defer their own salary and the owner is comfortable committing to the match or nonelective formula every year. Its tradeoff is the lowest contribution ceiling of the three. A Solo 401(k) fits an owner with no non-spouse employees who wants to maximize contribution capacity and values a Roth account or a plan loan. Because each plan’s real ceiling depends on your own compensation, modeling the numbers against our retirement calculator beats comparing headline dollar figures alone. Always consult your own legal, financial, and tax professionals before opening any of these accounts.

Frequently Asked Questions About Self-Employed Retirement Plans

What is the best retirement plan for a self-employed person?

There is no single best answer. An owner-only business usually gets the highest contribution capacity from a Solo 401(k). A business with a few employees that wants the simplest employer-funded plan often chooses a SEP IRA. A small business under 100 employees where staff want to defer their own pay typically uses a SIMPLE IRA.

How much can a self-employed person contribute to a SEP IRA in 2026?

An employer, including a self-employed individual, can contribute the lesser of 25 percent of compensation or $72,000 for 2026, employer-only, with no employee deferral and no catch-up.

How much can a self-employed person contribute to a Solo 401(k) in 2026?

A Solo 401(k) owner can defer up to $24,500 as an employee for 2026 and add an employer profit-sharing contribution, combined to an overall ceiling of $72,000, or $80,000 with the age-50 catch-up, or $83,250 for savers age 60 through 63.

Can a self-employed business with employees use a SIMPLE IRA?

Yes, as long as the business has 100 or fewer employees who earned at least $5,000 in the prior year. The employer must then either match employee deferrals dollar-for-dollar up to 3 percent of compensation or make a 2 percent nonelective contribution for every eligible employee.

Can you borrow money from a Solo 401(k)?

Possibly, if the specific plan document allows it, generally up to the lesser of $50,000 or 50 percent of the vested balance. This is a plan-dependent feature, and not every prototype Solo 401(k) document offers it. A SEP IRA or SIMPLE IRA does not permit loans at all, since borrowing from an IRA is a prohibited transaction that can disqualify the account.

This article is educational information about self-employed retirement plan structures, not individualized tax, legal, or financial advice. Contribution rules, eligibility tests, and plan-document features vary by provider and by year. Always consult your own legal, financial, and tax professionals before opening or changing a retirement account.

By Tim Schmidt + Sean Webster Reviewed by Sean Webster