30 Year Fixed Interest-Only Mortgage

Fixed rate interest-only mortgages have become quite popular lately. We'll look at a 30 year fixed mortgage with a 10 year interest-only period. After the interest-only period has elapsed the loan is fully amortized. Thus, the payment will increase at the beginning of the 11th year even though the interest rate will remain unchanged over the life of the loan. Since it is a fixed rate mortgage the minimum, maximum and starting interest rate will be the same and the index rate, margin and adjustments are ignored.

When you press the Calculate button you'll see that after 10 years that the principal balance remains at the original loan amount and more than $11,000 per year has been paid in interest. At the beginning of year 11 the loan is fully amortized and the minimum monthly payment jumps $341 to $1,280, an increase of 36%. Click on the Calculate button in the form below to generate the results or enter your own information.

Fixed-Rate Interest-Only Mortgages:
30 Year Fixed Interest-Only Mortgage    20 Year Fixed Interest-Only Mortgage

Interest-Only ARMs With Interest-Only Periods Matching Fixed-Rate Period:
Interest-Only 3/1 ARM    Interest-Only 5/1 ARM    Interest Only 7/1 ARM
Interest-Only 10/1 ARM

Interest-Only ARMs With Interest Only Periods Longer Than Fixed-Rate Period:
3/1 ARM (10 Year Interest-Only Period)    5/1 ARM (10 Year Interest-Only Period)
7/1 ARM (10 Year Interest-Only Period)

Interest-Only Calculator
Loan Amount$
Loan Term years
Starting Interest Rate%
Loan is Interest-Only for years
Interest Rate Index & Margin
 
Current Index %
Margin %
 
First Rate Adjustment
Interest Rate is Fixed for months
Maximum Rate Increase%
Subsequent Rate Adjustments
Adjustments Everymonths
Maximum Rate Increase%
Life of the Loan Limits
Minimum Interest Rate%Maximum Interest Rate%
Future Interest Rate Scenarios
Best Case
(Index Rate Goes To Zero in 2nd Month)
Stable
(Index Rate Stays Same for the Life of the Loan)
Worst Case
(Index Rate Increases to the Maximum in 2nd Month)
  = Required

 

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