Negative Amortization
Negative amortization occurs when your monthly payment is less than the interest owed, causing your loan balance to grow instead of shrink. The unpaid interest is added to the principal, so you can end up owing more than you originally borrowed. These loans are rare today but were common in the lead-up to the 2008 financial crisis.
In a standard amortizing loan, every payment covers at least all the interest due, plus some principal. With negative amortization, the payment cap is set so low that it doesn't cover the interest. For example, if you owe $5,000 in interest for the month but your payment is capped at $3,000, the $2,000 shortfall is added to your balance—your $500,000 loan might become $502,000 next month.
Option ARMs were the most notorious negative-am product. They offered borrowers multiple payment choices each month, including a minimum payment that could trigger negative amortization. Many borrowers chose the minimum payment without fully understanding that their loan balance was increasing. When home values dropped and their loan balance had grown, they found themselves deeply underwater.
The Dodd-Frank Act effectively banned negative amortization loans from the Qualified Mortgage (QM) category, making them much harder to originate and sell. If you encounter a loan product that mentions a 'payment cap' or 'deferred interest,' ask specifically whether negative amortization is possible.
Key Takeaway
Negative amortization occurs when your monthly payment is less than the interest owed, causing your loan balance to grow instead of shrink. The unpaid interest is added to the principal, so you can end up owing more than you originally borrowed. These loans are rare today but were common in the lead-up to the 2008 financial crisis.
Related Terms
Frequently Asked Questions
They exist but are rare and heavily regulated. They cannot be classified as Qualified Mortgages under Dodd-Frank, meaning lenders face greater legal liability. Most mainstream lenders don't offer them.
Review your loan documents for language about 'minimum payments,' 'payment caps,' or 'deferred interest.' If your statement shows a balance increasing despite making payments, you may have a negative-am loan.
Your loan balance grows over time instead of shrinking. If home values drop or don't rise enough, you can owe more than your home is worth (being 'underwater'), making it impossible to sell or refinance without a loss.
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