What Is Loan Amortisation? 🏡
Amortisation is the process of paying off a loan. This happens over a set period of time through regular, scheduled payments. These payments are usually made monthly. They cover both the loan’s principal (the amount you borrowed) and the interest (the fee charged by the lender). A standard mortgage amortisation period can range from 20 to 30 years. Over this time, your regular payments systematically reduce your loan balance to zero.
An amortisation schedule is a detailed breakdown of this repayment plan. It’s a table that shows you exactly how each of your payments is divided. The schedule separates principal from interest. Lenders provide this schedule so you can see your progress. You can also track how the loan balance is declining over time.
The Amortisation Schedule: A Detailed Breakdown
When you first start paying off an amortised loan, a larger portion of each payment goes toward the interest. This is because the interest is calculated on the remaining loan balance. That balance is at its highest in the early years. As you continue making payments, the outstanding principal decreases. Consequently, the interest portion of your payments also gets smaller. This means that over time, a larger and larger share of each payment is applied directly to the principal. This accelerates your progress toward paying off the loan.
This predictable repayment structure is what makes an amortisation schedule so valuable. It allows you to know exactly how much you need to pay each month. You can also see how long it will take to pay off the entire loan.
You can learn more about different types of home loans in our comprehensive guide to mortgage types. For a more in-depth look at how interest is calculated, check out this resource on simple vs. compound interest.
How to Calculate an Amortisation Schedule
An amortisation schedule provides a clear, detailed overview of your loan repayments. It shows you exactly how each payment is divided between the principal and interest charges. This helps you understand how you’re paying off your loan over time.
For a home loan, the schedule outlines all your required monthly payments for the entire loan term. It breaks down each payment, indicating the portion that reduces your outstanding balance and the amount that covers the interest. It also illustrates how the interest is evenly distributed across your monthly payments.
Amortisation Calculation in Action
You can use an online amortisation calculator to easily create a schedule. However, understanding the basic calculation can help you see how the process works.
Here’s a simple example to illustrate how to calculate the first month’s payment distribution for your loan amortisation schedule:
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Loan Amount: $500,000
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Loan Term: 30 years
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Interest Rate: 4.19%
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Monthly Repayment: $2,443
Step 1: Calculate the first month’s interest.
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Multiply the loan amount by the interest rate:
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$500,000 x 4.19% = $20,950 (yearly interest)
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Divide the yearly interest by 12 to get the monthly interest:
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$20,950 / 12 = $1,745.83 (monthly interest)
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This is the amount of interest you will pay in your very first month.
Step 2: Calculate the first month’s principal payment.
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Subtract the interest payment from your total monthly repayment:
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$2,443 – $1,745.83 = $697.17 (principal payment)
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The remaining amount, $697.17, is what reduces your loan balance in the first month.
For the second month, the process is similar. You’ll use the new, slightly lower principal amount ($500,000 – $697.17) to calculate the interest. This means the interest portion of your next payment will be slightly less, and the principal portion will be slightly more. This shift continues with every payment until the loan is fully paid off.
