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Your monthly payment is calculated using the standard PMT (payment) formula: M = P[r(1+r)^n]/[(1+r)^n-1], where P is the principal, r is the monthly interest rate, and n is the number of payments. This gives a fixed amount that covers both principal and interest.

An amortization schedule shows each monthly payment broken down into the portion that pays interest and the portion that reduces your principal balance. Early in the loan, most of your payment goes to interest. Over time, more goes toward principal.

Extra payments go directly to reducing your principal balance, which means less interest accrues going forward. Even small extra payments (e.g. $50–$200/month) can shave years off your loan and save thousands in interest.

As of 2024, good personal loan rates range from 6%–12% APR for borrowers with excellent credit (750+). Average rates are 11%–20%. Rates above 25% are considered high-cost. Your credit score, income, and debt-to-income ratio heavily influence your rate.

Shorter terms mean higher monthly payments but significantly less total interest paid. Longer terms lower your monthly payment but increase total cost. A good rule of thumb: choose the shortest term where the monthly payment is comfortably within your budget (under 15% of take-home pay).

The interest rate is the base cost of borrowing. APR (Annual Percentage Rate) includes the interest rate plus any fees (origination fees, closing costs), making it the true cost of the loan. Always compare APRs, not just interest rates, when evaluating loan offers.