What is a 'Deferred Interest'
Deferred interest is the amount of interest added to the principal balance of a loan when the contractual terms of the loan allow for a scheduled payment to be made that is less than the interest due. When a loan's principal balance increases because of deferred interest, it is known as negative amortization. For example, adjustablerate mortgages, known as payment option ARMs, and fixedrate mortgages with a deferrable interest feature carry the risk of the monthly payments increasing substantially at some point over the term of the mortgage.
BREAKING DOWN 'Deferred Interest'
Deferred interest is interest that has accrued on a loan but has not been paid. The interest accumulates when a loan payment is not large enough for covering all the interest due.History of Deferred Interest
Before the mortgage crisis of 2008, programs such as payment option ARMs let borrowers choose their monthly payment. Mortgagors could choose a 30year or 15year payment, an interestonly payment covering interest but not reducing the principal balance, or a minimum payment not even covering the interest due. The difference between the minimum payment and the interest due was the deferred interest, or negative amortization, which was added to the loan balance.
For example, say a mortgagor received a $100,000 payment option ARM at a 6% interest rate. The borrower could choose from four monthly payment options: a fully amortizing 30year fixed payment of $599.55; a fully amortizing 15year payment of $843.86; an interestonly payment of $500; or a minimum payment of $321.64. Making the minimum payment means deferred interest of $178.36 is added to the loan balance monthly. After five years, the loan balance with deferred interest is recast, meaning the required payment increases enough to pay off the loan in 25 years. The payment becomes so high, the mortgagor cannot repay the loan and ends up in foreclosure. This is one reason why loans with deferred interest are banned in some states and considered predatory by the federal government.
Negative Amortization
With a deferred interest mortgage or payment option ARM, the mortgagor may have a payment cap and the interest rate may increase. Because the difference is added to the balance, rather than lowering the amount owed on a loan, the debt increases.
This may be a challenging situation, especially if the mortgagor wants to sell the home. Deferred interest may result in a borrower being upsidedown in a mortgage, meaning he owes more than he may receive from selling the home.

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Negative Amortization
An increase in the principal balance of a loan caused by making ... 
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A periodic loan payment, part of which is principal and part ... 
Amortized Loan
A loan with scheduled periodic payments of both principal and ... 
Option AdjustableRate Mortgage ...
A type of mortgage where the mortgagor (borrower) has several ...

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