Amortization is the gradual decrease of a debt over a set period of time. It is a process of spreading out a loan into fixed periodic payments. Each monthly payment will be fixed to a certain amount of the loan. However, a portion of the payment will cater to the requirements of loan costs, which the lender gets to pay for acquiring the loan and reducing the principal loan amount.
While calculating the amortization of the loan, the payment is based on the amount of the loan, the total number of installments, and the annual interest rate charged. These three elements will help you evaluate your monthly payments and the interest fee.
Payment Formula: PMT=iPV/(1-(1+i)-n)
Using the payment formula, we can evaluate the present value of each loan installment paid to the lender. The payment calculated will be the total payment each month for the duration of the loan. Loan payments consist of two parts: principal and interest.
Interest Payment Formula: P*i
P= Remaining Principal
i= interest rate
Let’s take an example to calculate the Loan Amortization. For instance, we take out a loan of 2-year, $100,000 at 5% annually, with monthly payments.
The first step here is to calculate the monthly payment towards the loan. We will use the above formula to insert the present value of the loan, interest rate and the total number of installments.
For each month, the total payment will be 4387. Next, we need to calculate the interest paid towards the loan each month.
Interest= 100,000 * 0.05/12
It represents the payment paid towards the interest is $416.67 in this first month. However, this value will vary each month according to the balance of the loan.
The next step is to calculate the portion paid towards the principal. This value will be determined using the formula below:
Principal= 4387.14 – 416.67
Lastly, the balance figure evaluates the balance of the loan after a period’s payment is the previous balance of the loan minus the portion of the payment made towards the principal. For the first month, the calculation will be:
Balance= 100,000- 3970.47
Now that we have all our values calculated, the schedule of payments will look like this:
Common Types of Amortization Loans: