This is your marginal tax rate, the rate at which each additional dollar of income will be taxed. If you pay only Federal income taxes, it is the highest tax bracket you used when you calculated your taxes. Federal tax brackets currently are: 10%, 15%, 25%, 28%, 33%, and 35%. If you also pay state and/or local income taxes, these marginal rates can be added to the Federal rate. For example, if you had to pay 25% to the IRS and 5% to the state of Pennsylvania, your tax bracket is 30%. To perform a "pre-tax" analysis enter zero (0) as the tax rate.The period may be stated in fractions. For example, 25 years and 1 month would be entered as 25.083, 25 years and two months would be 25.167, and 25 years and 3 months would be 25.25, etc.This affects the after-tax analysis because on a purchase transaction points are fully deductible in the first year whereas on a refinance the deduction must be spread over the life of the loan.This is the interest rate you could earn on the monies you spend during the period you are in your home. For most people, it would be the interest rate on a bank account or a money market fund. In after-tax cost comparisons, this figure is adjusted to an after-tax basis.Select the specific index used by your ARM from the ARM disclosure form. To find its current value, see the sources in Adjustable Rate Mortgage Indexes. Slide mouse over yellow box at beginning of line to close pop-up.The amount that is added to the index value on a rate adjustment date. It is shown in the ARM disclosure form.On a new loan, this is the initial rate period. On an existing loan, it is the number of months until the next rate adjustment date.This is the maximum amount that the interest rate can change on the first rate adjustment. ARMs that have initial rate periods of 5 years or longer often have larger adjustment caps on the first rate adjustment than on subsequent
adjustments.After the initial rate period, the rate on most ARMs changes every year, every 6 months, or every month.