SEP-IRA vs SIMPLE IRA: Which Retirement Plan Fits Small Businesses?

SEP-IRA Lets One Employee Put Away $70,000 — SIMPLE IRA Covers a Whole Team

Small business owners face a retirement plan design problem that large corporations solved with dedicated HR departments: which plan maximizes owner savings while satisfying IRS nondiscrimination rules for employees? The SEP-IRA and SIMPLE IRA are the two most common answers for businesses with fewer than 100 employees, but they serve different needs. SEP-IRAs are built for maximum tax-deferred savings with minimal administration. SIMPLE IRAs are built for small teams that want employee participation and employer matching at a lower complexity ceiling than a full 401(k).

SEP-IRA at a Glance

A Simplified Employee Pension IRA allows employers to make contributions directly to employees' IRAs under a single plan structure. There are no employee salary deferrals — only employer contributions. This simplicity is both its strength and its constraint.

• Contribution deadline: Tax filing deadline including extensions (up to October 15 for most small businesses)
• Plan establishment deadline: Also the tax filing deadline — a SEP-IRA can be opened and funded retroactively for the prior tax year
• Employee eligibility: Any employee who has worked for the business in at least 3 of the last 5 years, is at least 21 years old, and earned at least $750 (2025) from the business
• Vesting: Immediate — all contributions are 100% vested immediately
• Contribution uniformity: The same percentage of compensation must be contributed for all eligible employees, including the owner

SIMPLE IRA at a Glance

A Savings Incentive Match Plan for Employees IRA allows both employee salary deferrals and employer matching contributions. SIMPLE IRAs are available to businesses with 100 or fewer employees who earned at least $5,000 during any of the preceding two calendar years.

• Employee deferrals: Up to $16,500 in 2025 (plus $3,500 catch-up for age 50+)
• Employer mandatory contribution (choose one): 3% match on employee deferrals, or 2% nonelective for all eligible employees regardless of participation
• Plan establishment deadline: October 1 of the year contributions are intended — earlier than SEP-IRA
• Vesting: Immediate on all contributions
• Early withdrawal penalty: 25% if withdrawn within the first two years of participation (vs. 10% standard IRA penalty after two years)

Side-by-Side Comparison

Contribution Limit Scenarios: Which Plan Wins?

The right plan depends heavily on business income and workforce size. Three scenarios illustrate the tradeoffs:

The SEP-IRA's nondiscrimination requirement is the key constraint: whatever percentage of compensation you contribute for yourself, you must contribute that same percentage for every eligible employee. Generosity toward employees is legally mandatory, not optional. A business with significant employee headcount finds the SEP-IRA expensive at high owner contribution levels.

The SECURE 2.0 SIMPLE IRA Enhancements

SECURE 2.0 introduced several SIMPLE IRA changes effective 2024–2025 that narrow the gap with 401(k) plans:

• Higher deferral limits for small businesses: Employers with 25 or fewer employees can offer a 10% higher SIMPLE IRA deferral limit ($18,150 for 2025), and employers with 26–100 employees can offer the higher limit if they also increase their employer match to 4% or nonelective contribution to 3%
• Catch-up super provision: Participants aged 60–63 can contribute an additional catch-up of $5,250 (150% of the standard $3,500 catch-up) starting in 2025
• Mid-year termination: SECURE 2.0 allows an employer to replace a SIMPLE IRA mid-year with a safe harbor 401(k) — previously impossible — expanding exit flexibility

This article is for informational purposes only and does not constitute financial or tax advice.