Suppose, we want to make payment of Tk.5000 each year for 10 years to an account which earns 6 percent interest, compounded annually, and we want to calculate the total amount which will be in the account after 10 payments. This series of periodic payments is called an annuity. The Annuity Calculator is no longer available. Use the new Retirement Income Calculator to help you decide whether receiving monthly income is right for you by comparing the available options and features that might meet your needs: TSP monthly payments and a life annuity.