Amortization
Amortization spreads out loan repayment over time. Explore how principal and interest are allocated in a mortgage amortization schedule.
Definition
Amortization refers to the systematic process of paying off a debt over a set period of time through regular installments that include both principal and interest. In the early years of a typical 30‑year mortgage, the bulk of each payment goes toward interest; later payments gradually apply more toward reducing the principal balance. Lenders provide amortization schedules that detail exactly how each monthly payment is split between interest and principal and show the declining loan balance over the life of the loan. Understanding amortization helps borrowers evaluate how extra payments on principal can shorten the loan term and reduce total interest costs, and enables comparisons among different loan products.
Why It Matters
On a $500,000 loan at 6.5%, the first payment sends about $2,708 to interest and $452 to principal. That ratio is why selling in year three often leaves you with less equity than expected once commission and excise tax come out. It also means an extra $300 a month toward principal, started early, can cut roughly six years and well over $100,000 in interest off the same loan.
Examples
A homeowner four years into a 30-year $400,000 loan requests a payoff and finds the balance is $381,000. About $19,000 of principal against roughly $100,000 paid in.
A borrower sends one extra $2,400 payment each January. The loan retires in year 25 instead of 30 and saves about $118,000 in interest.
Refinancing a six-year-old mortgage into a fresh 30-year term at a slightly lower rate restarts the schedule. The payment drops $190, but total interest over the remaining years goes up.
Tips
Ask your servicer for the full amortization schedule and find the month where principal first exceeds interest. On most 30-year loans at current rates that is somewhere past year 18.
Mark extra payments 'apply to principal' or select that option online. Otherwise many servicers park the money and apply it to next month's payment, which saves you nothing.
Compare loan offers on total interest, not monthly payment. A 20-year term at a quarter point higher costs far less across the full period than a 30-year at the lower rate.
Related Terms
Principal
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Negative Amortization
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Bi-Weekly Mortgage
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