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Loan payments are calculated using an amortization formula that spreads the repayment of principal and interest evenly across the loan term. The formula ensures that each monthly payment is the same amount, but the proportion allocated to interest versus principal changes over time.

In the early months, a larger share of each payment goes toward interest because the outstanding balance is still high. As you pay down the principal, the interest portion decreases and more of each payment reduces the balance. By the final months of the loan, nearly all of each payment goes toward principal.

The standard formula is: M = P[r(1+r)^n] / [(1+r)^n - 1], where M is the monthly payment, P is the principal, r is the monthly interest rate (annual rate divided by 12), and n is the total number of payments.

The loan term has a significant impact on both your monthly payment and the total cost of borrowing. Here is how different terms compare for a $25,000 loan at 5.5% interest:

• 36 months: $754/month, $2,139 total interest
• 48 months: $582/month, $2,912 total interest
• 60 months: $478/month, $3,700 total interest
• 72 months: $409/month, $4,503 total interest

A shorter term means higher monthly payments but significantly less interest paid overall. A longer term offers lower monthly payments but increases the total cost. The best choice depends on your budget. As a general rule, choose the shortest term you can comfortably afford to minimize total interest costs.

For auto loans specifically, financial experts recommend keeping the term at 60 months or less to avoid owing more than the car is worth (being "upside down" on the loan), since vehicles depreciate rapidly in the first few years.

The interest rate you receive depends on several factors, most of which you can influence:

• Credit score: This is the single biggest factor. Borrowers with scores above 740 typically qualify for the lowest rates. Each tier below that adds roughly 1-4 percentage points.
• Debt-to-income ratio: Lenders prefer borrowers whose total monthly debt payments are less than 36% of their gross income.
• Loan amount and term: Very small loans may carry higher rates because the lender's fixed costs represent a larger percentage. Longer terms sometimes have slightly higher rates.
• Secured vs. unsecured: Secured loans (backed by collateral like a car) generally have lower rates than unsecured personal loans because the lender's risk is lower.
• Shop around: Rates can vary significantly between banks, credit unions, and online lenders. Get quotes from at least three lenders. Multiple loan inquiries within a 14-day window count as a single hard pull on your credit report.