Question 1

When this is useful

Accepted Answer

Comparing finance offers, checking a dealer’s monthly-payment quote against the real numbers, or seeing how a bigger deposit or a shorter term changes what you pay. Dealers love to negotiate on the monthly payment — this shows the price and interest hiding behind it.

Question 2

How the payment is worked out

Accepted Answer

CalcWize uses standard amortising-loan math on the amount financed (price + sales tax + fees − down payment − trade-in). Each month, interest is charged on the outstanding balance and the rest of the payment reduces principal, so a longer term means more payments and considerably more interest.

Question 3

Watch the term, not just the payment

Accepted Answer

A lower monthly payment usually means a longer loan and more total interest. Stretching a loan to 72 or 84 months makes the payment look affordable while quietly adding thousands in interest — and you stay underwater (owing more than the car is worth) for much longer. Shorter is cheaper.

Question 4

Sales tax and fees

Accepted Answer

In many places, tax and documentation or registration fees are financed alongside the car, so you pay interest on them too. CalcWize includes them in the amount financed; set sales tax to 0 if it does not apply where you are or is paid separately.

Question 5

Common mistakes

Accepted Answer

Focusing only on the monthly payment, ignoring the APR (which folds in most fees), and rolling negative equity from an old loan into the new one. Always ask for the APR and the total of payments — not just the monthly figure — before you sign.

汽車貸款計算機 — 月付、利息與總成本

何時有用

月付如何計算

盯住期限，不只是月付

稅金與手續費

常見錯誤

不做的事