Single-Premium Annuity. This is where the investment is made all at once in a lump sum. Flexible-Premium Annuity. This annuity can be funded with a series of payments. Immediate Annuity. With this annuity, the payments begin back to the purchaser instantly. Deferred Annuity. Payments will be redistributed back to the purchaser many years later. This is usually used as a vehicle to let the money gestate tax deferred. Fixed Annuity. The company will invest your money into fixed investments such as bonds, and the principal is guaranteed for a minimum period of time. Variable Annuity. With a variable annuity you are able to invest in either stocks, bonds, or cash equivalents. The principal is not guaranteed with this annuity.