Each tax year, you may be required to fill out Form 5500, depending on the type of plan you choose. If you're like many other small business owners in the United States, you may be considering the various retirement plan options available for your company.Keogh plans are retirement plans available to businesses that operate as sole proprietorships, partnerships or LLCs. The Summary Plan Description (SPD) should include your plan's claims procedures. Limited liability companies are generally presumed to be for profit. Contact TIAA for details. Vesting—your ownership of Penn's contributions (does not apply to employee contributions). PBGC's Missing Participants Program contains four types of retirement plans: Defined benefit plans that end in a standard termination.