US mortgage math: APR versus interest rate and amortization
A US homeowner’s guide to comparing mortgage APR, fixed and adjustable loans, and total repayment.
The US reader’s question
Why can two United States mortgage offers share an interest rate but have different total borrowing costs?
슬라이더를 움직여 내 원금이 복리로 불어나는 눈덩이 효과를 확인해 보세요.
* 세제 혜택(ISA/연금저축 비과세) 및 월 적립식 복리는 풀버전 계산기에서 지원합니다.
대출이자 계산기 정밀 분석How the mechanism works
Compare the Loan Estimate, APR, points, closing costs and whether the rate is fixed or adjustable. APR is designed to express broader borrowing cost, but the payment schedule must also be checked.
A practical example
On a hypothetical fixed-rate mortgage, earlier payments devote more to interest than later payments. Use an amortization table to test how an extra principal payment changes both total interest and maturity.
What this does not promise
An adjustable-rate mortgage can reset. Never infer a guaranteed future rate from a teaser period, and budget for insurance and property taxes separately where appropriate.
Verify before taking action
Use the CFPB mortgage resources and lender Loan Estimates, comparing the same loan amount and term.
Primary public reference
Consumer Financial Protection Bureau: https://www.consumerfinance.gov/owning-a-home/
Educational context only. This is not an investment recommendation, a live market report, personalized tax advice or a guaranteed outcome. Check current rules and your circumstances before acting.
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