A method of administering a single premium immediate annuity is disclosed. The method includes specifying an income payment amount representing a base level of purchasing power each scheduled annuity payment shall be able to substantially achieve. The amount of the annuity payment to be made at scheduled intervals being adjusted to maintain the purchasing power of the annuity payment, whereby the annuity payment is adjusted to accommodate inflation and maintain a base level of purchasing power. The method of administering the annuity including the inclusion of income payment adjustment ceilings and floors, whereby income payments cannot be reduced below a predefined minimum level, nor can income payments increase above a predefined maximum level in any given year.
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