SIMPLE IRA Guide: A Practical Retirement Plan for Small Employers

Small employers who want to help employees save without the administrative weight of a 401(k) often look at the SIMPLE IRA. The name says it: Savings Incentive Match Plan for Employees of small employers, designed to be simple. The trade-off is lower contribution limits and less flexibility.

Who can adopt one

An employer with 100 or fewer employees who received at least $5,000 in compensation in the preceding year can generally establish a SIMPLE IRA, provided the employer does not maintain another qualified retirement plan for the same employees. Self-employed individuals can also set one up for themselves. Recent legislation created some flexibility for employers with up to 500 employees with a grace period in certain cases, so verify current rules.

How it works

Employee deferrals. Eligible employees can defer part of their pay into a SIMPLE IRA up to an annual limit (for 2025, $16,500, with a catch-up contribution of $3,500 for age 50 and older, and higher limits under recent legislation for certain employers and ages). Limits are indexed annually.
Employer contribution. The employer must choose either a match or a nonelective contribution, described next.
Match option: a dollar-for-dollar match of employee deferrals up to 3 percent of compensation (the employer can reduce to as low as 1 percent in limited years).
Nonelective option: a 2 percent nonelective contribution for every eligible employee, whether or not the employee defers, subject to a compensation cap for that computation.
Immediate vesting. All contributions belong to the employee immediately.
Individual accounts. Each employee has a SIMPLE IRA at a financial institution.

Owners can participate as employees, deferring their own salary and receiving the employer contribution. For self-employed owners, compensation is net earnings from self-employment, after adjustments.

Eligibility for employees

The plan may require employees to have earned at least $5,000 in any two prior years and be expected to earn at least $5,000 in the current year. Employers can choose less restrictive criteria. Employees must be given notice and an opportunity to participate.

Setup and deadlines

Adoption deadline: generally by October 1 of the year for which the plan is to be effective, for an established business. A new business can adopt as soon as it becomes an employer, if it does so as soon as administratively feasible after the business begins. Some later adoption is permitted in narrow cases.
Model forms: Form 5304-SIMPLE or 5305-SIMPLE, or a prototype plan from a financial institution.
Annual notices: employees receive a summary description and an election period notice (typically at least 60 days before the start of the plan year).
Deposit timing: employee deferrals must be deposited as soon as they can reasonably be segregated from the employer's assets, and no later than 30 days after the end of the month in which they were withheld. Employer contributions are due by the business's tax filing deadline including extensions.
No Form 5500 filing for a SIMPLE IRA in the usual case.

Costs and administration

The plan has low costs. Financial institutions often charge minimal or no plan fees, with fees for individual accounts. Payroll systems can automate the deferrals. There is no nondiscrimination testing, which is a major benefit versus a traditional 401(k).

Limitations and trade-offs

Lower contribution limits compared with a 401(k) or solo 401(k).
Required employer contribution every year you maintain the plan, either the match or the 2 percent. You cannot skip a year.
Two-year rule for early withdrawals: distributions within the first two years of participation are subject to a higher early withdrawal penalty (25 percent instead of 10 percent) if not otherwise exempt, and rollovers to non-SIMPLE accounts during that period are restricted.
No loans.
Cannot have another plan at the same time for the same employees, with some exceptions.
Limited investment lineup depending on the provider, though IRAs generally allow a broad menu.
Roth deferrals were newly permitted by legislation but depend on provider availability.
The plan year and October 1 rule: you cannot add it late in the year if you did not adopt by October 1, unless you are a new employer.

When it fits

Small employers with several employees who want a modest, easy-to-administer plan.
Businesses with tight margins that want a predictable, capped employer cost.
Owners who would exceed what they can save in a SEP or solo 401(k) only slightly, and who have employees.
Employers who want employees to have a way to save with minimal fiduciary responsibility.

When it may not fit

High-earning owners who want to contribute much more than the SIMPLE limits. A 401(k) or a cash balance plan could allow more. See cash balance plan basics.
Businesses with only an owner and a spouse, where a solo 401(k) yields more. See solo 401(k) guide.
Employers who want flexibility to skip contributions in bad years.
Owners who want a Roth option or loans and whose provider does not offer them.

Comparison with a SEP

A SEP requires only employer contributions and can be funded at the last minute, but requires equal percentage contributions for eligible employees. A SIMPLE IRA lets employees defer, which lowers the employer's required cost if employees choose not to participate under the match formula. For some owners with a few employees, the SIMPLE's match can be cheaper than the SEP's percentage-of-pay contribution. Compare the costs with your census. See SEP IRA guide.

S-corp owners

For an S-corp owner, only W-2 wages count as compensation. The owner defers from wages, and the employer match or nonelective contribution is based on those wages. See retirement plans for S-corp owners.

Common mistakes

Missing the October 1 adoption deadline.
Skipping employee notices.
Not making the required employer contribution.
Depositing employee deferrals late.
Adopting a SIMPLE IRA while sponsoring another plan.
Forgetting the two-year early withdrawal rule.
Not coordinating with payroll, leading to incorrect deferrals.
Choosing the plan without comparing 401(k) alternatives that may offer better features at a similar cost.

For help selecting a plan for a small team and integrating it with payroll, AE Tax Advisors can assist, and a discovery call is a good first step. Also see payroll for new employers.