A mortgage amortization schedule is a table that shows how every monthly payment on your home loan is split between interest and principal, from the first payment to the last. Understanding your mortgage amortization schedule is the easiest way to see why you owe so much in the early years, how slowly your balance drops at first, and how much a few extra payments can save you.
In this guide, you will learn how an amortization schedule works, see a real example, and try our free calculator to build your own.
What Is a Mortgage Amortization Schedule?
Amortization simply means paying off a loan in equal installments over time. On a fixed-rate mortgage, your total monthly payment for principal and interest stays the same for the whole term. What changes is the mix inside that payment.
Each month, your lender first charges interest on the balance you still owe. Whatever is left from your payment goes toward the principal, which lowers your balance. Because the balance is highest at the start, the interest portion is also highest at the start. A mortgage amortization schedule lists this split for every single payment.
If you want a quick estimate of your full monthly payment, including taxes and insurance, try our mortgage calculator.
Free Mortgage Amortization Schedule Calculator
Enter your loan details below to see your monthly payment, your total interest, and a year-by-year breakdown of principal, interest and remaining balance.
This calculator covers principal and interest only. Property taxes, homeowners insurance and mortgage insurance are not included, so your real monthly bill will be higher.
Example: $300,000 Loan at 6.5% for 30 Years
Let’s look at a typical case. Say you borrow $300,000 at a fixed rate of 6.5% for 30 years. Your monthly principal and interest payment would be about $1,896.
In the very first month, about $1,625 goes to interest and only about $271 goes to principal. That means roughly 86% of your first payment is interest.
Here is how the balance falls over time:
| Time | Approximate remaining balance |
|---|---|
| After 5 years | $280,800 |
| After 10 years | $254,300 |
| After 15 years | $217,700 |
| After 20 years | $167,000 |
| After 30 years | $0 |
After a full decade of payments, you have repaid only about $45,700 of the original $300,000. Over the full 30 years, you would pay roughly $382,600 in interest on top of the $300,000 you borrowed. These figures are estimates and will vary slightly depending on how your lender rounds payments.
Why Early Payments Are Mostly Interest
Interest is calculated on your remaining balance. When you owe $300,000, a month of interest at 6.5% is about $1,625. As the balance shrinks, that monthly interest charge shrinks too, and more of your fixed payment is left over for principal.
In this example, the payment finally becomes more than half principal around year 19 to 20. Before that point, most of your money goes to the lender as interest. This is why selling or refinancing in the first few years usually leaves you with a balance that has barely moved.
How Extra Payments Change Your Amortization Schedule
Extra payments go straight to principal, so they reduce the balance that interest is charged on. That creates a snowball effect.
Using the same $300,000 loan at 6.5%, adding just $200 a month would pay the loan off in about 23 years instead of 30. You would save roughly $100,000 in interest, according to our estimate.
Before making extra payments, confirm two things with your lender:
- Extra money is applied to principal, not to your next month’s payment.
- There is no prepayment penalty on your loan.
To see how much faster you could be debt-free, use our mortgage payoff calculator.
How to Read Your Own Amortization Schedule
Your lender should give you a mortgage amortization schedule at closing, and most online accounts let you download an updated one. Look for these columns:
- Payment number or date: which installment each row represents.
- Payment amount: your scheduled principal and interest payment.
- Principal: the part that reduces your balance.
- Interest: the part that goes to the lender.
- Remaining balance: what you still owe after that payment.
If you have an adjustable-rate mortgage, your schedule will be recalculated every time the rate changes, so keep an eye on it.
Amortization vs. Recasting vs. Refinancing
Once you understand your schedule, you may wonder how to change it. There are three main ways:
- Extra payments: flexible, no fees, and you can stop any time.
- Recasting: you make a large lump-sum payment and the lender recalculates your payment on the lower balance. Learn more in our guide to mortgage recast vs. refinance.
- Refinancing: you replace your loan with a new one, which resets the schedule. Before doing it, check your costs with our refinance break-even calculator.
Does Amortization Affect Your Taxes?
If you itemize deductions, the interest you pay may be deductible, and because early payments are mostly interest, that deduction is larger in the first years. The rules and limits are explained in IRS Publication 936. Check with a tax professional about your own situation.
A Personal Note from José María
I built this calculator because I wanted a simple way for readers to see their loan in numbers instead of guessing. I am not a lender, a mortgage broker or a financial advisor, and I write FinanzasClave as an independent site to explain how mortgages work in plain English. Please use the calculator as a learning tool, and compare real offers from licensed lenders before making any decision. You can also find free, neutral guidance from the Consumer Financial Protection Bureau.
José María
Frequently Asked Questions
What is a mortgage amortization schedule?
It is a table listing every payment on your loan and how much of each goes to interest, how much goes to principal, and what balance remains.
Why do I pay so much interest at the beginning of my mortgage?
Interest is charged on your remaining balance, which is largest at the start. As you pay down the loan, the interest portion gets smaller.
Does paying extra reduce my monthly payment?
Usually not. On a standard loan, extra payments shorten the loan term and reduce total interest, but your monthly payment stays the same unless you recast.
Can I get a free amortization schedule from my lender?
Yes. Most lenders provide one at closing or in your online account. You can also build one with the calculator above.
Final Thoughts
A mortgage amortization schedule shows you exactly where your money goes each month and why the first years of a loan feel slow. Use the calculator above to build yours, try different extra payment amounts, and see how much time and interest you could save.
This article is for educational purposes only and is not financial advice. Rates, terms and tax rules change, so consult a licensed professional before making decisions.