If you owe more than your car is worth, this calculator shows exactly how rolling that negative balance into your next loan changes your monthly payment, total interest, and overall cost.
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When you trade in a vehicle worth less than you owe, the difference (negative equity) is added to your new loan. This means you're financing more than the new vehicle is worth from day one — a practice sometimes called "rolling over" or "stacking" debt.
The immediate consequences are: a higher monthly payment, more total interest paid over the loan term, and the risk of being immediately underwater on the new vehicle as well — creating a cycle of negative equity.
BHPH dealers in California are legally permitted to roll negative equity into new contracts. At interest rates of 18–29%+, rolling even a small negative balance dramatically increases the total cost of the new loan. If possible, pay off the negative equity separately rather than rolling it in.
Results are estimates for planning purposes only. Actual loan terms vary by lender and dealer. Consult with a financial advisor before making major borrowing decisions.