Negative Amortization
Negative amortization occurs when monthly payments don’t cover interest, increasing the loan balance. Learn where this risk arises.
Definition
Negative amortization occurs when a borrower’s monthly loan payment is insufficient to cover the interest due, causing the unpaid interest to be added to the principal balance. Over time, the loan balance grows rather than decreases. This situation can arise with certain adjustable‑rate mortgages, payment‑option ARMs, or student loans that allow deferred interest. Negative amortization increases the borrower’s debt and may lead to higher payments later. Borrowers should understand loan terms and avoid payment plans that allow the balance to grow uncontrollably.
Why It Matters
Negative amortization means your payment does not cover the interest, so the shortfall is added to what you owe and the balance climbs while you pay every month. Borrowers who make the minimum payment on an option ARM for a few years can end up owing more than the original loan, and if values have not risen they are underwater on a house they have never missed a payment on.
Examples
A borrower pays the minimum on a $400,000 payment-option ARM and after three years owes $418,000 despite paying on time throughout.
A loan hits its 110 percent balance cap and recasts to fully amortizing, and the payment jumps from $1,450 to $2,900 in a single month.
A graduated payment mortgage runs negative in years one and two by design, then crosses over as the scheduled payment rises.
Tips
Ask the lender directly whether the minimum payment covers all accrued interest. If the answer is no, the balance is growing and you should see the schedule showing by how much.
Find the recast trigger in the note, usually a balance cap or a fixed number of years. That date, not the rate, is where the payment shock lands.
Paying interest-only stops the balance growing but builds no equity. If you plan to sell soon that can be a defensible choice, and if you do not, it is a slow trap.
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