Contributions and costs are totally flexible. The plan is easy to understand by the employees. The plan is easy to set up by merely completing IRS Form 5305-SEP, unless a salary reduction SEP is desired. There is little or no administrative expense. Earning on the account are not currently taxed.
Participants have the right to direct investments.
Participants can also have an IRA account, if income is below certain limits. Employees can withdraw the funds as fast as they are put into the account. Employees usually control investments. Employer may not adopt a SEP if it ever had installed a defined benefit plan. There are no guarantees as to future benefits.