A SEP IRA is the simplest way for a small employer to put real money into staff retirement without running a payroll deduction scheme. The employer funds it, the employee owns it immediately, and nobody files an annual return for it.
That simplicity comes with one hard rule, and firms that ignore it end up making corrections. Therefore it pays to understand the eligibility test before you set anything up.
What a SEP IRA is in plain terms
A SEP IRA is an individual retirement account that an employer contributes to on behalf of a worker. The employee opens the account, or the employer opens one for them, and the money lands there directly.
Because the account is an IRA, the employee owns every dollar from the moment it arrives. There is no vesting schedule, and the firm cannot claw anything back if someone leaves in March.
Employees cannot make their own salary deferrals into a standard plan of this type. All of the money comes from the employer, which is the clearest difference from a workplace scheme people may have had elsewhere.
The name explains the design. Simplified means no annual return. Employee pension simply describes who ends up with the money.
Who can open one
Any employer can, from a sole trader with no staff through to a company with several hundred. Self-employed people use the same structure for themselves.
The Internal Revenue Service guidance on these plans sets out the forms involved, and for most small employers a single prototype document does the whole job.
Partnerships and corporations both qualify. So do firms that already run another plan, although combining them gets complicated enough to need an adviser.
Timing is flexible too. You can set one up years after the business started, and many owners do.
SEP IRA vs SIMPLE IRA and solo 401(k)
A SEP IRA suits an employer who wants flexibility on whether to contribute at all. Good year, fund it generously. Lean year, skip it entirely.
A SIMPLE IRA lets employees contribute from salary, which spreads the cost, though it commits the employer to a match every year. Meanwhile a solo 401(k) usually allows the largest contribution for a one-person business, at the price of more paperwork.
The Department of Labor’s overview of retirement options for small businesses compares the structures side by side, and it is written for owners rather than for specialists.
Cost shapes the choice in the end. A SIMPLE commits you to a match every year. This plan commits you to nothing.
How much you can contribute to a SEP IRA
The employer may contribute up to twenty-five percent of each eligible employee’s compensation, subject to an annual dollar cap. That cap stood at seventy thousand dollars for 2025. The IRS adjusts it most years, so check the current figure first.
Self-employed owners use a lower effective rate on net earnings, because the calculation subtracts part of the self-employment tax first. An accountant will run it in a minute, and the arithmetic is easy to get wrong by hand.
Contributions are discretionary. You pick a percentage each year, and zero is a legitimate answer in a bad one.
Round numbers help in practice. Many owners settle on five or ten percent, then hold it steady so staff know what to expect.
The rule that catches employers out
Whatever percentage you choose applies to everyone who qualifies, including yourself. An owner cannot take twenty-five percent and give staff five.
Eligibility reaches further than most owners expect. An employee generally qualifies at twenty-one. They must also have worked for you in three of the last five years. On top of that, they must clear the small annual earnings floor the IRS sets.
Part-time and seasonal staff count. Three summers of weekend work can make someone eligible, so run the list properly before you fund anything.
You may use looser rules than the statutory ones, never stricter. Covering people sooner is allowed; excluding someone the test includes is not.
Keep the list current. Review it each January, before you decide the rate. Small teams usually track this inside their HR software, since a record of start dates and hours is all it takes.
What a SEP IRA costs an employer
Setup is usually free or close to it, since most providers charge nothing to open the plan. The real cost is the contribution itself.
Model it at your actual headcount before you promise anything. A ten percent contribution across six eligible staff is a meaningful line in the budget, and it arrives in the same quarter as your tax bill.
Administration stays light. There is no annual government filing, which is the main saving against a 401(k), and your payroll software can usually produce the compensation figures you need.
Setting it up, taxes and deadlines
You can establish the plan and fund it as late as your business tax filing deadline, including extensions. That makes it the rare benefit you can add after the year has ended.
Contributions are deductible to the business and are not taxable to the employee when paid. The money then grows untaxed until the employee withdraws it in retirement.
Keep the adoption agreement on file. Nobody asks for it often, yet it is the document that proves the plan exists.
Open the accounts early as well. Providers take a few days, and a late account can miss an otherwise comfortable deadline.
Mistakes that create a correction
The commonest error is excluding an eligible part-timer. Correcting it means funding that person retroactively, usually with earnings on top.
Second, owners use different percentages for different people. Uniformity is the whole bargain of this plan type.
Third, firms forget that compensation has a definition. Bonuses and commissions normally count, so a contribution calculated on base salary alone comes out short.
Finally, some employers promise a rate in advance. Announce the plan rather than the number, because next year may not look like this one.
A fifth error is silence. Staff who never hear about the contribution cannot value it, so put the figure in writing each year.
Where a SEP IRA fits in a benefits package
A SEP IRA signals stability to candidates who have never been offered retirement money before. For a firm of ten, that signal is worth more than another half-day of leave.
It also helps on the way out. Staff who leave keep the account, so the benefit never feels like something the company took back.
Pair it with the rest of your offer rather than treating it as the whole of it. Our guide to employee retention strategies covers how benefits work alongside pay and progression, and a retirement contribution rarely fixes a problem on its own.
Frequently asked questions about SEP IRA plans
Can an employee contribute to a SEP IRA?
Not through salary deferral in a standard plan. They may still pay into their own separate IRA, subject to the usual annual limits for personal contributions.
What happens when you hire someone mid-year?
Nothing immediately, since the service test looks back over several years. Track their start date, though, because eligibility arrives on a schedule you need to anticipate.
Can you skip a year?
Yes, and that flexibility is the main attraction. Tell staff clearly when you do, so the gap does not read as an oversight.
The practical takeaway
A SEP IRA gives a small employer a serious retirement benefit with almost no administration, provided you accept that everyone eligible gets the same percentage. Build the eligibility list first, model the cost at your real headcount, and decide the rate once a year with your accountant. This is general information rather than tax advice, so confirm the current limits and your own position before you commit.