Any employer–sole proprietorship, partnership, corporation, and non-profit organization – with one or more employees can establish a SEP plan. Contributions limits for SEP IRAs can be found here . There are no Roth versions of SEP IRAs. A SEP won’t prevent you from contributing to either a Roth IRA or a Traditional IRA. However, your ability to deduct the Traditional IRA contributions may be reduced depending on your income (MAGI) if you open a SEP IRA.