A SEP, or Simplified Employee Pension Plan, is an IRA-based employer retirement plan that’s very similar to a profit sharing plan. All SEP contributions are made by your employer. The employer decides how much to contribute for the year, anywhere from 0% to 25% of an eligible employee’s compensation with a maximum of $51,000 for 2013. After your employer decides how much to contribute, that contribution will be deposited into your IRA. Note that SEP contributions can never be made into your Roth IRA or your SIMPLE IRA.