Annuity annual interest rate calculator
Immediate annuities calculator allows you to calculate the annuity,in which the contractor begins to pay his/her payments immediately after the establishment of the contract. This does not have any accumulation period. Immediate / Ordinary Annuity Interest Rate Calculator. English. Annual rate of return(%) Frequency of payment Annuity Formula. Annuities are used in retirement accounts, where the goal is to make a starting balance pay a fixed annual amount over a given number of years.. See How Finance Works for the annuity formula.