Auto Loan Comparison

Auto Loan Comparison

This tool lets you compare two auto loan options side by side to find the better deal. Enter the loan amount, interest rate, and term for each option, and the calculator instantly shows which loan has the lower monthly payment, lower total interest, and lower total cost — helping you make a data-driven decision.

How Loan Comparisons Work

Each loan option uses the standard amortization formula independently:

M = P x [r(1 + r)^n] / [(1 + r)^n - 1]

The calculator computes the monthly payment, total interest, and total cost for both loans, then highlights the differences. The better deal is the one with the lower total cost over the full loan term, though the lower monthly payment may be a priority depending on your budget.

Example

Key Factors That Affect Loan Comparisons

• Interest rate difference — even a 1% rate difference can save over $1,000 on a typical car loan
• Term length — a shorter term with a slightly higher payment often costs thousands less in total
• Loan fees — some lenders charge origination fees that should be factored into the total cost
• Total cost vs. monthly payment — a lower monthly payment with a longer term usually means more total interest paid
• Prepayment penalties — check if either loan charges a fee for paying off early

Tips

1. Always compare total cost, not just the monthly payment — a lower monthly payment with a longer term can cost thousands more overall
2. Get quotes from at least two lenders (dealer, bank, credit union) to create a meaningful comparison
3. A credit union rate of 4-5% versus a dealer rate of 7-8% on a $30,000 loan saves roughly $3,000-$5,000 over the loan term
4. Use the side-by-side results to negotiate with the dealer — showing a better offer often motivates them to match or beat it