As a small business owner, you have a wide variety of investment choices for Keogh plans. When your fund is small, invest conservatively; other than Social Security, the Keogh plan may be your only retirement fund. If you serve as your own trustee, you must assume liability for the total fund should there be losses due to your mismanagement. You can appoint a bank, trust company or company that manages pensions to serve as trustee. Or, you can buy an annuity from an insurance company or use a bank as a custodian to hold certificates of deposit. Be sure to check carefully on the soundness of the firm you choose to handle your plan.