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How Loan Amortization Works

Amortization is the process of paying off debt with regular payments over time. Each payment covers both interest (the cost of borrowing) and principal (reducing the loan balance). Early payments are mostly interest; later payments are mostly principal.

The Loan Payment Formula

Where PMT = monthly payment, P = loan amount, r = monthly interest rate (annual rate ÷ 12), n = total number of payments (term in years × 12).

The Impact of Extra Payments

Making extra payments toward principal reduces your total interest paid and shortens the loan term. Even $50-100 extra per month can save thousands in interest on a long-term loan. The savings are proportionally larger early in the loan when the balance is highest.

Common Loan Types

• Auto loans: Typically 3-7 years, rates from 4-8% for good credit
• Personal loans: Usually 2-7 years, rates from 6-36% depending on credit
• Student loans: Federal rates are fixed by government; private loans vary widely
• Business loans: SBA loans typically 5-25 years with competitive rates

How to Pay Off Loans Faster

• Round up payments. If your payment is $347, pay $400. The extra $53 goes straight to principal.
• Make biweekly payments. Paying half your monthly payment every two weeks results in 13 full payments per year instead of 12.
• Apply windfalls. Tax refunds, bonuses, and side income applied to principal accelerate payoff significantly.
• Refinance when rates drop. If rates drop 1%+ below your current rate, refinancing can save thousands.