Loan amortization – Meaning, types, and how it works

Navigating the complexities of money borrowing and repayment can be daunting, especially for substantial sums. To address this, the concept of loan amortization was developed, providing a structured repayment plan with clear, periodic payments covering both principal and interest. In this article, we aim to simplify loan amortization and provide you with a comprehensive understanding of this financial tool.


What is Loan Amortization?

Loan amortization is a structured type of loan with a scheduled repayment framework encompassing both accrued interest and the principal amount. It focuses on paying off interest over a defined period, followed by addressing the principal or both simultaneously. This repayment method is commonly used for various loans such as car loans, personal bank loans, and home mortgages.

How Does Loan Amortization Work?

Understanding the mechanics of loan amortization is crucial. Interest calculations are based on the most recent ending balance of the loan, allowing for varying interest payments based on your adherence to the payment schedule. Any surplus payments made at the designated periods reduce the principal by the excess amount. This, in turn, lowers the remaining balance used to calculate subsequent interest. This system encourages extra payments, ultimately reducing the overall interest paid since it’s determined based on the most recent ending balance. Over time, interest and principal exhibit an inverse relationship within an amortized loan.

The Purpose of Amortizing a Loan

Loan amortization aims to provide borrowers with a clear roadmap for repayment. It allows for the gradual settlement of the loan over an extended period, with consistent payments at each interval. While sticking to the scheduled payments is key, borrowers also have the option to accelerate the process by making extra payments, effectively reducing the outstanding principal. This dual approach enables borrowers to address both interest and principal simultaneously, providing flexibility in managing the loan.


Types of Loan Amortization

  1. Full Amortization: This type ensures that paying the full amortization amount will result in a zero outstanding balance at the end of the loan term, making it the most common form of loan amortization.
  2. Partial Amortization: Partial amortization involves paying a portion of the amortization amount with each installment. This reduces the outstanding principal for each month. However, there may still be an outstanding balance at the end of the term if only partial payments are made.
  3. Interest Only: In interest-only amortization, no payments are allocated to the principal during the loan term. The focus is solely on paying off the interest, leaving the principal amount unchanged at the term’s conclusion.
  4. Negative Amortization: This type provides lower monthly payments compared to interest-only loans in the short term. However, it leads to increased outstanding principal over time. Shortfalls in payments are added to the total loan amount at the end of each month.

Practical Example of Loan Amortization

Let’s illustrate the four categories of loan amortization with a scenario: borrowing N300,000 with a 20-year repayment plan.

  • Full Amortization: The loan would be entirely paid off after 20 years.
  • Partial Amortization: Some amount may still be owed, but it would be significantly less than the initial N300,000.
  • Interest Only: The interest would be paid off, but the principal of N300,000 would remain.
  • Negative Amortization: It’s likely that more would be owed at the end of the loan term.


Loan amortization offers a transparent system for borrowers, providing a clear repayment plan while incentivizing timely payments through favorable interest rates. Sticking with a full amortization loan is recommended, as delving into other types may pose risks. By understanding the nuances of loan amortization, borrowers can navigate their financial commitments with confidence.

Leave a Reply

Your email address will not be published. Required fields are marked *