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ARM vs. Fixed Rate Mortgage



    Calculator
Glossary
A fixed rate mortgage has the same payment for the entire term of the loan. An adjustable rate mortgage (ARM) has a rate that can change, causing your monthly payment to increase or decrease. Use this calculator to compare a fixed rate mortgage to two types of ARMs, a Fully Amortizing ARM and an Interest Only ARM.

Enter Mortgage Information
Loan Information
Mortgage amount
Term
Expected rate change
Fixed Mortgage
Interest rate
ARM Fully Amortizing
Interest rate
Months rate fixed
Interest rate cap
ARM Interest Only
Interest rate
Months rate fixed
Interest rate cap

Show amortization schedule by

 Year Month

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        Fixed Rate Mortgage
        Fully Amortizing ARM
        Interest Only ARM
        Mortgage amount
        Term in years
        Expected rate change
        Interest rate
        Months rate fixed
        Interest rate cap
        Monthly payment
Fixed Rate Mortgage

A fixed rate mortgage has the same interest rate and monthly payment throughout the term of the mortgage. The payment is calculated to payoff the mortgage balance at the end of the term. The most common terms are 15 year and 30 years.

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Fully Amortizing ARM

This is the most common type of ARM. The monthly payment is calculated to payoff the entire mortgage balance at the end of the term. The term is typically 30 years. After any fixed interest rate period has passed, the interest rate and payment adjusts annually. A Fully Amortizing ARM will also have a maximum rate that it will not exceed. This calculator uses a maximum interest rate of 12%. Below is a list of the most common types of Fully Amortizing ARMs.

Common Adjustable Rate Mortgages
ARM TypeMonths Fixed

10/1 ARM

Fixed for 120 months, adjusts annually for the remaining term of the loan.

7/1 ARM

Fixed for 84 months, adjusts annually for the remaining term of the loan.

5/1 ARM

Fixed for 60 months, adjusts annually for the remaining term of the loan.

3/1 ARM

Fixed for 36 months, adjusts annually for the remaining term of the loan.

1 year ARM

Fixed for 12 months, adjusts annually for the remaining term of the loan.

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Interest Only ARM

An Interest Only ARM only requires monthly interest payments. Since you are not paying any principal, as you are with the other two types of mortgages described above, this can lower your monthly payment. However, since your mortgage's principal balance is not decreased, you will have a balloon payment at the end of the mortgage's term. Like a Fully Amortizing ARM, an Interest Only ARM will often have a period where the interest rate is fixed, and then it is adjusted annually. An Interest Only ARM will also have a maximum interest rate that it will not exceed. This calculator uses a maximum interest rate of 12%.

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Mortgage amount

Expected balance for your mortgage.

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Term in years

The number of years over which you will repay this mortgage. The most common mortgage terms are 15 years and 30 years. Please note that for the Interest Only ARM you will have a balloon payment for the entire principal balance at the end of the loan term.

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Expected rate change

The annual adjustment you expect in your ARM. The range for this calculator is minus 3% to plus 3%. Use a negative value if you believe interest rates will decrease, a positive value if you believe they will increase.

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Interest rate

Annual interest rate for each mortgage type. Typically an ARM will have a lower interest rate than a fixed rate mortgage. The rate of an Interest Only ARM will vary by lender.

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Months rate fixed

This is the number of months the rate is fixed for an ARM. During this period the interest rate and the monthly payment will remain fixed. The rate will then adjust annually by the expected rate change.

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Interest rate cap

This is the maximum interest rate for this mortgage. The mortgage's interest rate will never exceed the interest rate cap.

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Monthly payment

Monthly principal and interest payment (PI) for the Fixed Rate Mortgage and the Fully Amortizing ARM. This is an interest only payment for an Interest Only ARM.

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Information and interactive calculators are made available to you as self-help tools for your independent use and are not intended to provide investment advice. We can not and do not guarantee their applicability or accuracy in regards to your individual circumstances. All examples are hypothetical and are for illustrative purposes. We encourage you to seek personalized advice from qualified professionals regarding all personal finance issues.

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  © 2009 GMAC Mortgage, LLC (f/k/a GMAC Mortgage Corporation). All rights reserved.
GMAC is a registered service mark.

© 2009 GMAC Mortgage, LLC (f/k/a GMAC Mortgage Corporation). All rights reserved. GMAC is a registered service mark.