Negative amortization refers to a financial situation where the loan balance increases over time instead of decreasing. This occurs when the borrower pays less than the interest due on the loan, causing the difference to be added to the principal balance. Synonyms for negative amortization can include "deferred interest", which refers to the accumulation of unpaid interest, "upside-down loan", where the loan amount exceeds the value of the asset it finances, and "graduated payment mortgage", a loan that starts with low initial payment amounts but gradually increases over time. Regardless of the term used, negative amortization can have long-term consequences, making it vital for borrowers to carefully consider their repayment plans.