Facts About ARM's, Adjustable Rate Mortgages  What is an ARM?
An Adjustable Rate Mortgage, called an ARM for short, is a mortgage with an interest rate that is linked to an economic index. The interest rate, and your payments, are periodically adjusted up or down as the index fluctuates.
ARM Terminology
Index
An index ia a guide that lenders use to measure interest rate changes. Common indexes used by lenders include the activity of one, three, and five-year Treasury securities, but there are many others. Each ARM is linked to a specific index.
Margin
Think of the margin as the lender's markup. It is an interest rate that represents their cost of doing business plus the profit they will make on the loan. The margin is added to the index rate to determine your total interest rate. It usually stays the same during the life of the loan.
Adjustment Period
The adjustment period is the period between potential interest adjustments.
• You may see an ARM described with figures such as 1-1, 3-1, and 5-1.
The first figure in each set refers to the initial period of the loan, during which your
interest rate will be the same as it was on the day of closing.
• The second number is the adjustment period, showing how often adjustments can be
made to the rate after the initial period has ended. The examples above are all ARMs
with annual adjustments.
If my payments can go up, why should I consider an ARM?
The initial interest rate for an ARM is lower than that of a fixed rate mortgage, where the interest rate remains the same during the life of the loan. A lower rate means lower payments, which might help you qualify for a larger loan.
More ARM Considerations
• How long do you plan to own the house? The possibility of higher rates isn't as much
of a factor if you plan to be in the home for a relatively short time.
• Do you expect your income to increase? If so, the extra funds might cover the higher
payments that result from rate increases.
• Some ARMs can be converted to a fixed-rate mortgage. However, conversion fees may
be high enough to take away all of the savings you saw with the initial lower rate.
• While you can't dictate which index a lender uses, you can choose a lender based on
the index that will apply to your loan. Ask how each index used has performed in the
past. Your goal is to find a loan linked to one that has remained fairly stable.
• When comparing lenders, consider both the index and the margin rate being offered.
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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.
Definitions
- 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.
- 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 Type | Months 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. |
- 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%.
- Mortgage amount
- Expected balance for your mortgage.
- 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.
- 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.
- 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.
- 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.
- Interest rate cap
- This is the maximum interest rate for this mortgage. The mortgage's interest rate will never exceed the interest rate cap.
- 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.
The mortgage calculators are provided by KJE Computer Solutions, LLC and made available to NUMBER1EXPERT as self-help tools for your independent use and are not intended to provide investment advice. We can't 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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