What Is Mortgage Amortization?
Mortgage amortization is the process of paying off your home loan over time with regular payments, so that the amount you owe decreases with each payment. Each monthly payment is split into two parts: one part goes toward the interest charged on the outstanding balance, and the other part reduces the principal, or the original amount you borrowed.
On a typical fixed-rate mortgage, the combined principal and interest payment stays the same for the entire loan term. But the portion that goes toward interest and principal changes with every payment. This gradual shift is what allows you to eventually own your home outright at the end of the loan term.
Amortization Schedule Basics
An amortization schedule is a table that lists each mortgage payment and shows how much is applied to principal and interest, as well as the remaining balance after each payment. It is a detailed roadmap of your loan from the first payment to the last.
The schedule is calculated using the loan amount, the interest rate, and the loan term. Because interest is charged on the outstanding balance, the interest portion of each payment is highest at the beginning and gradually decreases as you pay down the principal.
You can typically find your amortization schedule in the closing documents provided by your lender. It can help you see how your payments are allocated and how your equity builds over time.
Sources: Freddie Mac
How Principal and Interest Are Allocated Over Time
In the early years of your mortgage, most of each payment goes toward interest because your loan balance is still high. The remainder is applied to the principal. As the loan is paid down, the interest portion of each payment decreases, and the principal portion increases. This means that over time, more of your payment goes toward reducing the balance.
For example, on a 30-year fixed-rate mortgage, the interest is front-loaded. You pay a larger share of interest in the first years, and a smaller share as the loan matures. This is due to the way interest is calculated: it is based on the outstanding balance, which gets smaller with every payment you make.
Extra Payments on Amortization
Making extra payments toward the principal can have a significant effect on your amortization. Because interest is calculated against the principal balance, paying down the principal faster reduces the total interest you pay and can shorten the loan term.
For example, on a 30-year fixed-rate mortgage of $200,000 at 4% interest, paying an extra $100 per month toward principal can cut the loan term by more than 4.5 years and reduce interest paid by more than $26,500. The same loan with an extra $200 per month can cut the term by more than 8 years and reduce interest by more than $44,000.
Another strategy is to make half-monthly payments every two weeks instead of one full monthly payment. This results in the equivalent of one extra monthly payment per year, which can also shorten the loan term and reduce the total interest paid.
Sources: Wells Fargo
Example Amortization Schedules (15-Year and 30-Year)
The tables below show simplified amortization schedules for 15-year and 30-year fixed-rate mortgages. They illustrate how the monthly payment remains constant while the principal and interest portions change over time.
In the first year, most of each payment goes to interest. By the middle of the loan term, the split begins to shift more toward principal. By the final years, most of the payment goes toward principal. This pattern is typical for a fully amortizing fixed-rate loan.
Note that these examples are for illustration and do not reflect current rates or your specific situation. The 15-year term results in higher monthly payments but a faster payoff and less total interest compared to the 30-year term.
| Term | Monthly Payment | Total Interest Paid | Total Paid |
|---|---|---|---|
| 15-year | $1,479 | $66,288 | $266,288 |
| 30-year | $955 | $143,739 | $343,739 |
Sources: Freddie Mac
Amortization and Refinancing
When you refinance, you take out a new loan to pay off your existing mortgage, and the amortization process begins again. This can affect how your payments are allocated and the total interest you pay.
If you refinance into a new 30-year loan, you may have a lower monthly payment, but you could end up paying more interest over the life of the new loan because the term is extended. Alternatively, refinancing into a shorter term, such as a 15-year loan, can help you build equity faster and pay less interest, but your monthly payment may be higher.
The decision to refinance depends on your financial goals, current rates, and how long you plan to stay in the home. It is important to consider closing costs and the new loan's term carefully.
Frequently asked questions
Why is more of my early payment interest than principal?
In the beginning of your mortgage term, your loan balance is still high, so the interest charged on that balance is also high. Most of your monthly payment is applied to the interest you owe, and the remainder is applied to paying off the principal. As you pay down the principal, the interest portion of each payment decreases, and more of your payment goes toward reducing the balance.
Sources: Consumer Financial Protection BureauCan I change my amortization schedule?
The standard amortization schedule is set when you take out the loan, but you can effectively change it by making extra principal payments. You can also refinance into a new loan with a different term, which creates a new amortization schedule.
Sources: Freddie Mac, Wells FargoWhat is negative amortization?
Negative amortization occurs when you make payments that are less than the interest due, causing your mortgage balance to increase rather than decrease. The unpaid interest gets added to the amount you borrowed, so the amount you owe increases. This can be risky because you can end up owing more on your mortgage than your home is worth.
Sources: Consumer Financial Protection BureauDoes extra payment reduce my interest?
Yes, because interest is calculated against the principal balance. Paying down the principal faster reduces the total interest you will pay over the life of the loan.
Sources: Wells FargoHow does loan term affect amortization?
A shorter loan term, such as 15 years, means higher monthly payments, but you pay less interest overall because the loan is paid off faster. A longer term, such as 30 years, has lower monthly payments, but you pay more interest over time. The amortization schedule reflects these differences: the ratio of principal to interest changes more quickly with a shorter term.
Sources: Consumer Financial Protection BureauSources
- How does paying down a mortgage work? — Consumer Financial Protection Bureau
- Mortgage Key Terms — Consumer Financial Protection Bureau
- Understanding amortization — Freddie Mac
- Loan amortization and extra mortgage payments — Wells Fargo
- What is negative amortization? — Consumer Financial Protection Bureau