How Loan Payments Are Calculated
Loan payments are calculated using the standard amortization formula. With each payment, a portion goes toward interest and the rest reduces the principal balance. In early payments, more goes to interest; over time, more goes to principal.
M = P × [r(1+r)n] / [(1+r)n - 1]
Where M = monthly payment, P = principal, r = monthly interest rate, n = number of payments.
Types of Loans
- Personal loans: Unsecured, typically 6-7 years, rates 6-36%
- Auto loans: Secured by vehicle, 3-7 years, rates 4-15%
- Student loans: Federal (fixed ~5-7%) or private (variable 3-15%)
- Home equity loans: Secured by home, 5-30 years, rates 7-12%
- Business loans: Various terms, rates depend on creditworthiness
Tips to Reduce Loan Costs
- Improve credit score: Higher scores qualify for lower rates
- Choose shorter terms: Less time = less total interest
- Make extra payments: Even small extra payments save significant interest
- Compare lenders: Rates vary widely between lenders
- Refinance if rates drop: Refinancing can lower your rate