Single premium immediate annuity with adjustable payment

A method of providing a financial product includes providing a computer processor, determining, using the computer processor, a fluctuating interest rate using a sum of a securities-based interest rate and an additional interest rate, and generating, using the computer processor, a periodic payment product using the fluctuating interest rate, wherein the periodic payment product is characterized by a payment schedule. The method also includes generating, using the computer processor, a plurality of fluctuating periodic payments using the fluctuating interest rate and obtaining an indication to fix the fluctuating interest rate at a fixed interest rate. The method further includes thereafter, determining, using the computer processor, the fixed interest rate and generating a fixed periodic payment using the fixed interest rate.