Before we get into the details of how simple interest is calculated, first let us understand what simple interest is.

Simple interest is a fast and simple strategy to calculate a loan interest charge. Simple interest is defined by multiplying all the interest rate by the principal and by the number of days that pass between payments. ​The formula for simple interest can be something like Simple Interest=P*I*N, where, P=Principle I=Interest Rate and N=Number of Days between Payments.

This sort of interest, as a rule, applies to short-term loans or vehicle credits, but till date, some mortgages also use the calculation method given above.

Uses of Simple Interest

  • Borrowing cash

In the case of borrowing, you will have to pay the interest on how much you have taken as a loan.

  • Lending money

In case of an investment account, settled deposit, or repeating deposit, you may get the sum as the interest on your principal.

How Simple Interest is Calculated

Interest on your loans adds on every day. Therefore, a part of your monthly compensation distributed to interest may vary. If you want to know how simple interest is calculated on your loan, you should follow the steps below:

1. Through the Online banking Account services page, get a fresh principal balance of your loan. You can also get the balance through phone service.

2. Now, multiply your interest rate with your principal balance, then divide it with the number of days in a year to find your total daily interest.

3. To find your due interest, multiply the sum above by the number of days that have passed after your final payment.

Here is an instance of how the number of days between payment can change the payment distributed to interest.

1. You have $10,000 as a principal balance.

2. If you multiply $10,000 by 8.5% interest and divide it by 365 days, it will equal to $2.33 per day.

3. Given that you made the payment 33 days ago multiply $2.33 by 33 days, and you will get $76.85.

This payment will be distributed to the accrued interest.

Now, let us assume that 29 days have passed between payments.

1. You have $10,000 as a principal balance.

2. If you multiply $10,000 by 8.5% interest and divide it by 365 days, it will equal to $2.33 per day.

3. Given that you made the payment 29 days ago multiply $2.33 by 29 days, and you will get $67.53.

This payment will be distributed to the accrued interest.

This example brings out the variation of four days between installments with a difference in the interest by $9.32.

Real-Life Simple Interest Loans

Two instances of how simple interest is calculated can be seen on vehicle loans and credit cards. For example, you are taking out a simple interest vehicle loan. If the car is $100, you will have to take out a loan of $100 to fund it at a yearly interest rate of 5%, which should be repaid in a year.

To know how it works, let us discuss some real-life situations where simple interest is employed.

Car Loans

Car loans are disbursed every month, which suggests that a part of the credit pays the outstanding credit balance each month, and the leftover portion goes toward the payment of interest. As the outstanding credit balance reduces each month, the payable interest decreases, which suggests that more of your monthly payment goes toward the repayment of the principal.

For instance, you have a car loan of $20,000. The simple interest is 4% with a repayable loan over five years duration. Using the above method of calculation, over 60 months, your payment will amount up to $368.33 each month. The first monthly payment will be $66.67, where the principal loan is multiplied by the interest rate and divided by 12. Then subtract $368.33 by $66.67, and you will get $301.66. This amount will be your principal repayment. From the second month, the principal loan will be $19,698.34, with $65.66 as payable interest. The principal repayment within that month will be $302.67. This will go on till the end of the 60th month where the total outstanding loan balance will equal to zero. This is how simple interest is calculated.

Other consumer Loans

Department stores usually give major equipment on the basis of simple interest for up to one year. For example, if you purchase a fridge for $2,000 at a yearly simple interest rate of 8% in a monthly payment, you will be paying around $174 monthly. In the end, you will be paying a total of $2,088, as total interest costs $88. This is considerably less than the $160, which you would pay as interest if you had the $2,000 credit for the entire year, rather than repaying some amount each month.

Certificates of Deposit

A certificate of deposit is a sort of bank speculation that pays out a particular sum of cash on a specific date. You will not be able to withdraw from a CD until that specified date.

Using the same calculation, if you subsidize in a one-year $100,000 CD with an interest rate at 2%, after a year, you will receive $2,000 in interest wage. Considering the CD compensates the same interest rate, but this time, for six months, your interest income will be $1,000 when the sixth month ends.

Discount on Early Payments

In the trading world, providers frequently present a discount to stimulate the early installment of their invoices. For instance, a $50,000 receipt may deliver a 0.5% discount if you pay back in a month.

As simple interest is calculated on a day-to-day basis, it’s most beneficial to those who pay their credits on time every month. Simple interest is mostly applicable to vehicle credits or short-term loans. Most contracts do not utilize simple interest; however, there are still some few banks that use this strategy for contracts for bi-weekly payment plans.


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