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What is Amortization? A Guide to How Mortgage Payments Work

12/26/2025

Amortization is the process of paying down a mortgage loan balance over time through regular, fixed payments. Each payment covers both the interest charged by the lender and a portion of the principal loan amount. Understanding your amortization schedule is crucial because it shows you exactly how your payments are allocated and how your equity builds, which is fundamental to making informed financial decisions in real estate.

How Does an Amortization Schedule Work?

An amortization schedule is a table that details each payment over the life of the loan. For most fixed-rate mortgages, the monthly payment amount remains constant. However, the proportion of that payment applied to interest versus principal changes dramatically over time. In the early years of the loan, a larger portion of each payment goes toward interest. As the principal balance gradually decreases, the amount of interest charged each month also decreases. This allows a larger part of your fixed payment to be applied to the principal in the later years of the loan term. This front-loading of interest is a key concept for homeowners to grasp.

The following table illustrates the first year of a 30-year fixed-rate mortgage for $400,000 with a 6.5% annual interest rate.

Payment DateTotal PaymentPrincipal PaidInterest PaidRemaining Loan Balance
Year 1, Payment 1$2,528.27$358.94$2,169.33$399,641.06
Year 1, Payment 6$2,528.27$378.86$2,149.41$397,464.15
Year 1, Payment 12$2,528.27$399.80$2,128.47$395,190.62

What is the Difference Between Principal and Interest?

To fully understand amortization, you must distinguish between principal and interest. The principal is the original amount of money you borrowed to purchase the home. When you make a payment that reduces the principal, you are directly increasing your ownership stake, or equity, in the property. Interest, on the other hand, is the cost of borrowing money, calculated as a percentage of the outstanding principal balance. It is the lender's charge for providing you with the loan. In the early stages of a mortgage, you are primarily paying for the cost of borrowing.

Why is Understanding Amortization Important for Homebuyers?

A clear grasp of amortization empowers you in several ways. First, it reveals the true long-term cost of your home. By looking at the total interest paid over a 30-year term, you can appreciate the significant savings potential of securing a lower interest rate or making extra principal payments. Second, it helps you understand how your wealth builds over time. Seeing your equity grow with each payment provides a clear picture of your investment's progress. Finally, it informs decisions about refinancing or selling; if you sell early in the loan term, you may have less equity than anticipated because you've paid down very little principal.

How Can You Pay Off Your Mortgage Faster?

Many homeowners seek strategies to build equity faster and save on interest. One effective method is to make extra payments toward your principal balance. Even one additional payment per year can shorten the loan term by several years and save tens of thousands of dollars in interest. Another option is to refinance to a loan with a shorter term, such as moving from a 30-year to a 15-year mortgage. This typically comes with a higher monthly payment but a significantly lower interest rate, allowing you to pay off the principal more aggressively. Before pursuing either strategy, it's essential to confirm with your lender that there are no prepayment penalties.

In summary, amortization is the engine behind your mortgage.

  • Your monthly payment is split between interest and principal.
  • Early payments are heavily weighted toward interest.
  • Reviewing your amortization schedule is critical for financial planning.
  • Making extra principal payments can accelerate equity growth and lead to substantial interest savings.
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