Mortgage Calculator Use this calculator to view the total interest and total payment for a mortgage based on the loan amount, years of payments, and annual interest rate you enter. Social Security Benefits Use this calculator to estimate your Social Security benefits. Regular IRA vs. Roth IRA - Annual Contribution Use this calculator to determine whether a regular IRA or a Roth IRA is right for you. Auto Loans Find out how much automobile you can buy based on your monthly payment, or find out your loan payment based on your purchase price! Buying vs. Leasing - Auto Use this calculator to determine if you should lease or buy your next vehicle. Required Minimum Distributions The IRS requires that you withdraw at least a minimum amount - known as a Required Minimum Distribution - from your retirement accounts annually, starting the year you turn age 70-1/2. Determining how much you are required to withdraw is an important issue in retirement planning. Use this calculator to determine your Required Minimum Distributions.