SEP-IRA for Self-Employed & Business Owners: 2026 Contribution Limits, Rules & Tradeoffs

The SEP-IRA is the simplest high-contribution retirement plan available to business owners — no plan documents, no IRS filing, and contributions up to $72,000 for 2026. It's the default choice for millions of self-employed workers. But it has one significant trap: if you have employees, you must cover them at the same percentage as yourself. Here's everything you need to know.

What is a SEP-IRA?

A Simplified Employee Pension IRA (SEP-IRA) is an employer-funded retirement account governed by IRC §408(k). The employer (that's you as a business owner) makes contributions directly into an IRA held in each eligible employee's name — including your own. Contributions are 100% employer-funded; there is no salary deferral component.

Any business structure can sponsor a SEP-IRA:

• Sole proprietorships and single-member LLCs
• S-corporations and C-corporations
• Partnerships and multi-member LLCs
• Self-employed contractors (Schedule C)

Setup typically takes 15 minutes: complete IRS Form 5305-SEP (or a financial institution's prototype document) and open the IRA accounts. No IRS filing required. No Form 5500. No actuarial certification. This simplicity is the SEP's primary advantage.

2026 SEP-IRA contribution limits

For 2026, the SEP-IRA contribution limit is the lesser of 25% of compensation or $72,000.¹

• Compensation cap: Only the first $360,000 of an employee's compensation counts. At 25%, this means the $72,000 ceiling is reached when compensation reaches $288,000.
• No catch-up contributions: Unlike a 401(k), there is no additional catch-up amount for owners age 50 or older. The $72,000 cap is absolute regardless of age.

Source: IRS Notice 2025-67. §415(c) annual additions limit $72,000; §401(a)(17) compensation cap $360,000. Both values effective for 2026 plan year.

S-corp owner vs. sole proprietor: how the math differs

The contribution formula produces different numbers for S-corp owners vs. sole proprietors because the compensation base is defined differently.

S-corporation owner

Your SEP contribution equals exactly 25% of your W-2 wages from the S-corp. Distributions (K-1 income) do not count as compensation for SEP purposes and cannot be included in the calculation.

Sole proprietor / single-member LLC

The calculation is slightly more complex because self-employment (SE) tax interacts with the contribution. The IRS formula: contribute 25% of net SE income after subtracting half of SE tax. In practice, this works out to approximately 20% of net self-employment income (before the SE tax deduction).

The employee coverage problem

This is the SEP's most significant drawback for growing businesses. Under IRC §408(k)(2), you must make SEP contributions for every eligible employee at the same percentage of compensation that you contribute for yourself. Eligible employees in 2026 are those who:²

• Are at least 21 years old
• Have worked for the business during at least 3 of the last 5 years
• Earned at least $800 in compensation from the business in 2026

You can use less restrictive criteria (e.g., include employees after 1 year instead of 3), but you cannot be more restrictive than the IRS minimums.

If you have no W-2 employees (owner-only or owner + spouse), this issue disappears. A spouse working in the business can participate in the SEP at their own comp level — which may actually be useful if you want to shelter their income as well.

What a SEP-IRA lacks vs. a Solo 401(k)

Beyond the employee coverage issue, SEP-IRAs are more restrictive in several ways:

• No employee deferral. All contributions are employer-funded. An owner earning $150,000 net SE income can contribute ~$30,000 to a SEP, but could contribute $24,500 (deferral) + ~$30,000 (profit-sharing) = $54,500 to a Solo 401(k) — 80% more tax-deferred space.
• No catch-up contributions. A Solo 401(k) lets owners 50+ contribute an extra $8,000/year ($11,250 at ages 60–63). SEP has no catch-up — age doesn't change your limit.
• No Roth option. SEP contributions are always pre-tax. If you want Roth savings, you'd need to make a separate backdoor Roth IRA contribution (if your income permits) or maintain a separate Roth 401(k).
• No plan loans. You cannot borrow against a SEP-IRA balance.

What a SEP-IRA does better

Despite its limitations, the SEP is the right choice in specific situations:

• Maximum simplicity. No plan document update required. No IRS filing. No custodian restrictions on features. Open an account at any IRA custodian (Fidelity, Vanguard, Schwab, TD Ameritrade) and start contributing.
• Late adoption deadline. You can establish a SEP-IRA for the 2026 tax year as late as your tax return filing deadline including extensions — October 15, 2027 for most sole proprietors. This is useful if you want to make a large retroactive contribution after seeing your year-end income.
• Parallel with other plans. If you later move to a Solo 401(k) or cash balance plan, a SEP can still hold your rollover balance — there's no need to liquidate old SEP assets.
• Lower startup cost. For a brand-new business with modest income, the SEP's simplicity may outweigh the incremental contribution room of a Solo 401(k) until you're earning enough that the deferral and catch-up advantages matter.

Contribution deadline: the SEP's biggest advantage

SEP-IRA contributions can be made all the way through your tax return filing deadline, including extensions:

This is meaningfully different from the Solo 401(k), where the employee deferral election must typically be made by December 31 of the plan year. SEP contributions have no December 31 restriction — the only deadline is when you file. Waiting until you know your full-year income can help you optimize the contribution amount.

SEP-IRA vs. Solo 401(k): head-to-head

Bottom line: An owner under 50 with no employees earning more than ~$120,000 net gets essentially the same contribution room from a SEP as from a Solo 401(k). Below that income level, the SEP's simplicity wins. Above it — or once you turn 50 — the Solo 401(k) contribution room is substantially higher.

Layering a Cash Balance Plan on top of a SEP

If your income is high enough that even the $72,000 SEP or Solo 401(k) maximum feels inadequate, a cash balance plan can run simultaneously. Since the 2001 repeal of IRC §415(e), defined benefit and defined contribution plans no longer share an aggregate limit. A high-earning sole proprietor can contribute:

• SEP-IRA: up to $72,000 (or Solo 401(k): up to $72,000 + catch-up)
• Cash balance plan: $90,000–$330,000+ depending on age and actuarial assumptions
• Total potential deduction: $160,000–$400,000+ per year for owners in their 50s and 60s

The tradeoff: a cash balance plan requires a third-party actuary, mandatory annual contributions, and PBGC premiums ($111 flat in 2026). The plan locks in a funding obligation. But at a 37% federal marginal rate, every $100,000 of additional deduction is worth $37,000 in current taxes deferred.

Common mistakes with SEP-IRAs

• Forgetting to cover eligible employees. The IRS audits SEP compliance. If you contributed for yourself but excluded employees who meet the age/service/comp requirements, the plan can be disqualified. This triggers immediate income inclusion of all SEP assets — plus penalties.
• Using the wrong compensation base (S-corp). Only W-2 wages — not distributions — count for S-corp owners. Calculating 25% of total K-1 income overestimates the allowed contribution and creates an excess contribution (6%/year penalty on the excess).
• Sticking with SEP after turning 50. A 53-year-old sole proprietor earning $300,000 can contribute $72,000 to either a SEP or a Solo 401(k). But with a Solo 401(k), she can also make an $8,000 catch-up contribution — an extra $8,000 tax-deductible per year that adds up to $80,000+ over a decade.
• Treating the October deadline as a reason to procrastinate. You can fund the SEP as late as October 2027 for the 2026 year — but waiting also delays compounding. Consider estimating your contribution by year-end and funding at least a portion then.
• Not transitioning as the business scales. A SEP that made sense with $80,000 income and no employees may be the wrong plan at $500,000 income with two staff. Reviewing the plan choice annually is worth 30 minutes of your accountant's time.

Sources

1. IRS — SEP Contribution Limits (2026). Maximum contribution: lesser of 25% of compensation or $72,000 (2026); §401(a)(17) compensation cap $360,000; per IRS Notice 2025-67.
2. IRS — Retirement Plans FAQs Regarding SEPs. Employee eligibility requirements: age 21+, 3 of 5 years service, minimum $800 compensation threshold (2026); employer must use same contribution percentage for all eligible employees.
3. IRS — Simplified Employee Pension Plan (SEP). Plan setup via Form 5305-SEP, no Form 5500 filing requirement, contribution deadline equals tax return due date including extensions.
4. IRC §408(k) — Simplified Employee Pension, via Cornell LII. Statutory definition of SEP-IRA, contribution limits, and employee eligibility rules.
5. IRS Notice 2025-67 — 2026 Retirement Plan Dollar Limits. §415(c) annual additions limit $72,000; §401(a)(17) compensation cap $360,000; both effective for 2026 plan year.

Contribution limits verified against 2026 IRS figures per IRS Notice 2025-67. Employee eligibility threshold ($800) per IRS retirement plans FAQ for 2026. Values current as of May 2026.