A SEP IRA is a Simplified Employee Pension (SEP) allowing contributions to a traditional IRA, generally for small businesses (but can be any size). Only employers make contributions for their employees; employees can not contribute.
An employer can make contributions to an employee's SEP-IRA that do not exceed the lesser of:
Note: Elective salary deferrals and catch-up contributions are not permitted in SEP plans.
Compare that to a SIMPLE plan (Savings Incentive Match Plan for Employees) allowing contributions to a traditional IRA but is limited to businesses with 100 or fewer employees. Both employers and employees can contribute.
Contributions include:
No other contributions can be made to a SIMPLE IRA plan.
Employee salary contributions to a SIMPLE plan cannot exceed $16,000 in 2024 ($15,500 in 2023). Catch up contributions for employees age of 50 or over are allowed (max $3500 for 2023/2024).