SEP-IRA vs. SIMPLE IRA: Which Plan Fits a Business With Employees?

When it’s just you, the retirement-plan question is usually a SEP-IRA or a Solo 401(k). The moment you have employees, the math changes — because now any plan you set up has to cover them too, and the cost of that coverage is the whole decision. The two simplest plans for a small business with staff are the SEP-IRA and the SIMPLE IRA, and they split on one question: who puts the money in, you or your employees?

SEP-IRA: you fund it, for everyone, at the same rate

A SEP-IRA is employer-funded only. You contribute a percentage of compensation — up to 25%, capped at $72,000 for 2026 — and there are no employee salary deferrals. The appeal for an owner is the high ceiling and the flexibility: you can change the percentage every year, or contribute nothing at all in a lean year.

The catch with employees is the uniform-percentage rule. Whatever rate you give yourself, you generally must give every eligible employee the same rate. Contribute 15% for yourself and you’re contributing 15% for each eligible worker. With a handful of employees that gets expensive quickly — which is why the SEP shines for owner-only businesses and gets pricey as the payroll grows.

SIMPLE IRA: employees fund most of it themselves

A SIMPLE IRA flips the funding around. Employees can make their own salary deferrals — up to $17,000 in 2026, plus a $4,000 catch-up at 50+ (and an enhanced $5,250 at ages 60–63). As the employer, you make a smaller required contribution: either a dollar-for-dollar match up to 3% of pay for those who participate, or a 2% contribution for every eligible employee whether they participate or not.

That structure makes a SIMPLE much cheaper to offer, because the bulk of the funding comes out of employees’ own paychecks. The trade-offs: the contribution ceiling is far lower than a SEP, you generally must contribute every year (no skipping in a down year), and SIMPLE plans are limited to businesses with 100 or fewer employees that don’t maintain another plan.

The four questions that decide it

Who do you want funding the plan? If you want employees to fund their own retirement through deferrals — keeping your cost low and predictable — the SIMPLE fits. If you’d rather make a single employer contribution and have no deferral machinery, the SEP is cleaner.

How much do you want to put away for yourself? The SEP’s $72,000 ceiling dwarfs the SIMPLE’s limits. An owner who wants to shelter a large amount — and is willing to fund the matching percentage for staff — gets far more room in a SEP.

How steady are your profits? A SEP lets you dial the contribution up, down, or to zero each year. A SIMPLE locks you into a required annual contribution. Variable income leans SEP; steady income makes the SIMPLE’s mandatory match easy to live with.

How many employees do you have? A few employees and a high target contribution make the SEP’s equal-percentage rule costly — the SIMPLE’s employee-funded design is usually cheaper. Owner-only or nearly so, and the SEP’s simplicity and high ceiling win.

A timing note

The two plans also differ on setup deadlines. A SEP can be established and funded as late as your extended tax deadline — so you can still open one for last year while filing this year. A SIMPLE generally must be set up by October 1 to be effective for that year, so it takes more advance planning.

Where this fits

These are the employer plans; your personal retirement saving sits on top. If you’re weighing pre-tax versus Roth for your own contributions, see Roth IRA vs. Traditional IRA. And if you’re still mostly a one-person shop deciding between employer plans, the closer comparison is SEP-IRA vs. Solo 401(k). Either way, employee deferrals and matching run through payroll, which feeds directly into your estimated-tax math for the year.

This article is general information, not tax, legal, or investment advice. Contribution limits, employer-contribution rules, and the right plan depend on your headcount, payroll, and profits — and certain small-employer SIMPLE plans carry different limits. Let's review your business before you establish a plan.