SIMPLE IRA Rules for Employers: The Complete 2026 Checklist

SIMPLE IRA employers have to follow four main rules: have 100 or fewer employees and no other retirement plans, include all eligible employees (those who earned $5,000 in any two prior years), make deposits of employee contributions into the SIMPLE IRA within 7 business days after each payday, and issue an annual 60-day notice to all eligible employees by November 1.^[1] While SIMPLE IRAs are the least regulated type of employer-sponsored retirement plan, that doesn't mean there is none. The IRS will review these items in the order they will matter to you.

What are the SIMPLE IRA eligibility rules?

Eligibility for SIMPLE IRAs is on both sides of the equation and the Employer's side comes first. To be eligible to sponsor a SIMPLE IRA, your business must have 100 or fewer employees who received $5,000 or more in compensation during the prior tax year and may not maintain another retirement plan this year.^[1] This number includes part time/seasonal employees that met the $5,000 threshold as well as full time employees.

On the employee side, you must include those employees who have earned $5,000 in each of any two prior years, and are reasonably expected to earn $5,000 this year, and the full SIMPLE IRA eligibility rules cover the part-time and borderline cases. These represent the most restrictive requirements allowed by the IRS. However, if you wish, you may choose to relax these conditions (e.g., allow a new hire into the plan immediately) but you may never make them stricter. Still unsure that your plan type qualifies for any of these types? Begin with What Is a SIMPLE IRA?

What is the SIMPLE IRA deposit deadline?

SIMPLE IRA deposits are due in seven (7) business days. Deferrals deducted from an employee’s paycheck must be received by the Custodian no later than 7 business days after their payroll date, pursuant to the U.S. Department of Labor Safe Harbor rules for plans with fewer than 100 participants.^[2] Since the clock resets for each payroll, if your remittance process breaks down you will have a new failure on that payroll date until it is repaired. When one payment is missed, correcting a late SIMPLE IRA deposit goes directly to the Department of Labor, not the IRS.

Contributions made by employers to their plans are subject to a far less rigid time schedule than those made by employees. Employer contributions (i.e., either matching or nonelective) must be paid by the employer’s tax filing date with an extension if granted, thus they may be funded long after the close of the year. Only contributions withheld from employees have a 7 business day time limit, and that is all of the employee money which the Department of Labor will consider as plan assets once it has been withheld.

What is the SIMPLE IRA 60-day notice?

Every year prior to the beginning of each plan year, all employees who are eligible must receive a notice regarding what the employer will contribute in the coming plan year (the contribution formula) and that they have the opportunity to initiate or modify contributions. The notice has to be delivered before the November 2nd through December 31st election period begins, which means by November 1st for calendar-year plans.

Missing the notice does not void the plan, however it is not free for you either. If employees are given a later notice than normal they have extended election periods and there are penalties assessed against the employer, in addition to that the formula you announce will lock for the year. You should treat November 1st as an absolute deadline on your compliance calendar and deliver the notice annually using the same method so you can document delivery.

How do the contribution formulas and W-2 reporting work?

You have to choose from two different contribution formulas for funding one each year and you announce that choice in your annual notice. The 3% match contributes a dollar for every dollar contributed by the employee up to 3% of compensation. You can reduce it down to as little as 1% for 2 of any 5 years.^[3] The 2% non elective will pay every eligible employee 2% of their compensation regardless if they contribute or not, and it is fixed for the year.

Most smaller businesses choose to use the match because of the potential savings from employees that never enroll in the plan (those employees cost nothing), while the nonelective guarantees coverage for every employee. Below are side-by-side comparisons:

You will also need to consider a "true-up" at yearend because the match is based on full-year compensation, your paycheck-by-paycheck math often understates your contributions. For reporting purposes, employee deferrals that were made throughout the year appear in W-2 Box 12 with code S and the retirement plan check box must be marked as such. The details regarding how these formulas operate are provided in detail within SIMPLE IRA Employer Match Rules, while information concerning contribution limits is found within 2026 contribution limits guide.

What does the annual compliance calendar look like?

All deadlines for SIMPLE IRAs are tied directly to the compliance year's rules and have a predictable schedule. An existing company will need to establish its plan by the October 1 SIMPLE IRA setup deadline (there is no grace or second chance) prior to starting compliance. With payroll as the driving force behind many obligations, each deferral must be sent to the custodian within 7 business days after each pay date all through the year. Election windows begin on November 2, allowing employees until December 31 to make their election decision. This creates fall as the typical timeframe when notices must be distributed by employers, by November 1, so that employees may timely elect into the plan during this window of time.

In January, you issue W-2s that have the correct codes, and your tax filing deadline is when your employer contributions will be completed by. Post these dates to a calendar that matches the schedule your payroll runs from:

• Every payroll: you must put employee deferral money in their accounts within 7 business days.
• By November 1: give the 60 day notice for your next plan year.
• November 2nd to December 31st: Employee Election Window.
• January: Issue W-2s with Box 12 Code "S" and a check in the Retirement Plan box.
• Tax Filing Deadline: Fund Employer Contributions.

For the primary sources behind these rules, see IRS Publication 560.

The Bottom Line

A SIMPLE IRA has four enforceable rules from the IRS: 100 or fewer employees with no other plan, mandatory inclusion at $5,000 of earnings, employee deferrals must be deposited within 7 business days, and a 60 day notice is due by November first. Fund one contribution formula each year, report deferral amounts on your W-2 form under Box 12 code S, and the seven business day deposit rule is probably the biggest time-bomb for most small employers.

This guide is educational and summarizes IRS rules for SIMPLE IRA plans. It is not investment, legal, or tax advice. Your plan documents and current IRS limits control. Talk to your tax advisor about your business's circumstances.