SEP IRA vs SIMPLE IRA: which retirement plan fits your business

Behind the acronyms, these two plans describe themselves with unusual honesty. A Simplified Employee Pension — the SEP IRA — is exactly what the name says: a stripped-down pension, funded entirely by the employer, with no employee money anywhere in the design. A Savings Incentive Match Plan for Employees — the SIMPLE IRA — is built the other way around: employees set aside part of their own paycheck, and the employer is required to add an incentive on top. Same custodians, same tax treatment, and two opposite answers to the only question that matters here: whose money goes in.

That question is also how you choose between them. A freelancer with no payroll cares about one thing — which plan produces the higher ceiling on a given year’s profit — and gets a clear answer. An owner with three or four employees cares about something else entirely: what the plan will cost in contributions to other people’s accounts, every single year, including the bad ones. Walk both paths and the choice resolves faster than the brochures suggest.

A SEP IRA is funded entirely by the employer — up to 25% of compensation, with a $72,000 ceiling for 2026 — and can be skipped in a bad year. A SIMPLE IRA lets employees defer up to $17,000 but obligates the employer to contribute every year. No employees? The SEP usually wins. Small team? The SIMPLE’s cost is predictable.

Whose money goes in — the difference everything else follows from

A SEP IRA has exactly one funding source: the business. The employer decides each year whether to contribute and how much, up to the legal ceiling — and in a lean year the answer can simply be zero, with no penalty and no explanation owed to anyone. The employee contributes nothing, which carries a side effect people miss: because catch-up contributions are a feature of employee deferrals, the SEP has no catch-up at all. There is no employee money to catch up.

A SIMPLE IRA inverts that design. The centerpiece is the employee’s own salary deferral, taken from each paycheck much the way a 401(k) deferral would be. The employer’s role is mandatory but bounded: every year it must either match what employees defer or make a flat contribution for everyone eligible, and it cannot sit a year out the way a SEP sponsor can.

What the two share is the chassis. Every dollar, employer or employee, lands in an account with the tax treatment of a traditional IRA, opened in each participant’s name: deductible going in, taxed as ordinary income coming out. That chassis brings two rules along with it. Contributions are 100% vested the moment they hit the account — there is no waiting schedule an employer can impose. And because both plans are IRAs rather than 401(k)s, neither can ever lend you your own money back.

The 2026 numbers, side by side

The current figures come from the cost-of-living adjustments the IRS published in Notice 2025-67. On the SEP side, the employer may contribute up to 25% of compensation per participant, capped at $72,000 in total annual additions for 2026, counting no more than $360,000 of any one person’s compensation, per the IRS’s SEP contribution rules. On the SIMPLE side, an employee can defer up to $17,000 for 2026, plus a $4,000 catch-up from age 50 and an enhanced $5,250 catch-up at ages 60 through 63 under the SECURE 2.0 Act, per the IRS’s SIMPLE contribution rules. The employer then funds one of two formulas: a dollar-for-dollar match up to 3% of compensation, which only goes to employees who actually defer, or a 2% nonelective contribution for every eligible employee, deferring or not, computed on compensation up to that same $360,000 cap. One footnote for the smallest businesses: SECURE 2.0 allows certain small employers to apply a modestly higher deferral limit, with the specifics on the IRS’s SIMPLE page.

	SEP IRA	SIMPLE IRA
Who contributes	Employer only	Employee defers; employer must add
2026 limit	Up to 25% of compensation, max $72,000	$17,000 employee deferral + employer match or nonelective
Catch-up	None — there is no employee money to catch up	$4,000 at 50+; $5,250 at ages 60–63
Employer obligation	Discretionary each year — can be zero	Mandatory every year: 3% match or 2% nonelective
Vesting	100% immediate	100% immediate
Early-withdrawal penalty	10% before age 59½	10% — but 25% during the first 2 years of participation

The last row deserves a sentence of its own. Money pulled out of a SIMPLE IRA during your first two years of participation — measured from the first deposit — is hit with a 25% early-withdrawal penalty instead of the usual 10%, under the rules in IRS Publication 560. It is the tax code’s way of saying the incentive match was meant to stay put. For how these ceilings compare with every other account you might fund, the full map of 2026 retirement contribution limits lays them side by side.

No employees: the solo ceiling math

Run the numbers for a one-person business first, because this is where the SEP’s reputation comes from. The 25% headline rate quietly shrinks for a sole proprietor: your contribution is itself a deduction that reduces the income the percentage is applied to, and the IRS resolves that circularity in Publication 560 with a reduced rate of roughly 20% of net self-employment earnings — the figure left after the deduction for half of your self-employment tax, mechanics covered in how self-employment tax and net earnings are calculated.

Now compare. A freelancer clearing $80,000 of net profit has about $74,350 of net earnings, so the SEP allows roughly $14,870. A SIMPLE at the same income does better: a $17,000 deferral plus a 3% self-match of about $2,230 comes to roughly $19,230. Set the two formulas equal and they cross at exactly $100,000 of net earnings — 20% of that figure and $17,000 plus 3% of it both land on $20,000. Below the crossover, the SIMPLE’s flat deferral keeps it ahead; above it, the SEP pulls away and never looks back. At $200,000 of net earnings the SEP holds $40,000 against the SIMPLE’s $23,000, and the gap keeps widening toward the $72,000 ceiling.

Two refinements before you choose. First, the ~20% haircut applies to sole proprietors; an owner who has elected S-corp treatment contributes a true 25% of W-2 salary instead. Second — and more important — a solo who wants the highest ceiling at modest income shouldn’t really be choosing between these two at all. The Solo 401(k), the third option for owner-only businesses, stacks a full employee deferral — $24,500 for 2026, the standard 401(k) figure confirmed by the IRS — on top of the same 20% employer share, beating both plans at almost any income below the cap.

With employees: predictable cost beats raw ceiling

Hire one person and the whole calculus flips, because each plan now obligates you toward your staff in a different way.

The SEP’s rule is uniformity: whatever percentage of compensation you contribute for yourself, you must contribute for every eligible employee — and eligibility reaches anyone earning as little as $800 in 2026, under the SEP participation rules. Give yourself 20% of pay in a good year and you owe 20% of each eligible worker’s pay too. With one part-timer that may be tolerable; with four employees it turns every contribution to your own retirement into a payroll-wide expense, which is exactly why generous SEPs and growing teams rarely coexist.

The SIMPLE caps that exposure by design. Choose the 3% match and your cost is at most 3% of payroll — and only for the employees who actually defer, since no deferral means no match. Choose the 2% nonelective and you pay everyone eligible, but a known, flat 2%. Either way the bill is predictable and small relative to the SEP’s same-percentage rule, and your employees gain something a SEP never offers them: the ability to put away up to $17,000 of their own money. The trade is that the obligation arrives every year, profitable or not. A SEP lets you skip; a SIMPLE does not.

The decision rule

Strip it to one branch point. If you have no employees and expect more than roughly $100,000 of net earnings, the Simplified Employee Pension gives you the higher ceiling with zero annual obligation — and below that income, look hard at the Solo 401(k) before settling for either IRA. If you have a small team and want them saving without turning your own contributions into a payroll multiplier, the SIMPLE’s 3% match buys you a predictable, capped cost and a real employee benefit. And whichever you open, remember the fine print that doesn’t change: everything is immediately vested, nothing can be borrowed, and a SIMPLE IRA punishes early exits at 25% for two full years.

Sources

• IRS — Notice 2025-67 — 2026 cost-of-living adjustments: SIMPLE deferral $17,000, catch-ups $4,000 and $5,250 (ages 60–63), Section 415(c) annual-additions limit $72,000, compensation cap $360,000, SEP eligibility threshold $800.
• IRS — SIMPLE IRA contribution limits — employee deferral and catch-up amounts, the 3% match and 2% nonelective employer formulas, and the SECURE 2.0 higher deferral option for certain small employers.
• IRS — SEP contribution limits (including grandfathered SARSEPs) — the 25%-of-compensation / $72,000 limit, employer-only funding, and participation rules.
• IRS — 401(k) limit increases to $24,500 for 2026 — the standard 401(k) deferral used here as the comparison point for the Solo 401(k) alternative.
• IRS — Publication 560, Retirement Plans for Small Business — the reduced-rate (~20%) calculation for self-employed contributions, the same-percentage rule for SEP employees, and the 25% additional tax on early SIMPLE distributions.

Dollar figures are the IRS-published 2026 amounts from Notice 2025-67; the worked examples use rounded arithmetic on those limits, and your own ceiling depends on your exact net earnings and entity type.