Savings Incentive Match Plan for Employees of Small Employers (SIMPLE) – A plan in which a small business with 100 or fewer employees can offer retirement benefits through employee salary reductions and matching contributions (similar to those found in a 401(k) plan). It can be either a SIMPLE IRA or a SIMPLE 401(k). SIMPLE IRA plans impose few administrative burdens on employers because IRAs are owned by the employees and the bank or financial institution receiving the funds does most of the paperwork. While each has some different features, including contribution limits and the availability of loans, required employer contributions are immediately 100 percent vested in both.