Monthly payment with tax, trade-in, and negative equity handled correctly — plus what each loan term really costs.
In most states tax applies to price minus trade-in. Anything still owed on the trade rolls into the new loan.
| Term | Payment | Total interest | Total paid |
|---|
Longer terms buy a lower payment with more interest — and more months underwater on a depreciating asset.
This auto loan calculator turns price, down payment, trade-in, sales tax, and rate into a monthly payment, correctly rolling any negative equity from your old vehicle into the new loan. It also shows the total interest each term length adds.
We add sales tax to the price, subtract your down payment and trade-in value, add any negative equity, then amortize the result over your loan term at the given rate.
It means you owe more on your current car than it is worth. That gap gets added to the new loan, increasing the amount financed.
A longer term lowers the monthly payment but increases total interest paid. The calculator shows both so you can see the trade-off.