Category Archives: Uncategorized

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How to Calculate Savings Account Interest

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Depending on the institution where you have saved your money, banks often calculate savings interest using the following approaches:

Calculating Interests

  1. Daily interest – In this case, the banks will use your daily closing balance to calculate the interest for that particular day and save the interest amount in a separate account.
  2.  Monthly interest – The bank calculates the monthly interest using the average daily balance for the month or the lowest/minimum amount in that month.

Posting Interests

Once a bank determines your interest and stores the amount in a temporary account, the interest amount is posted in your account either monthly, quarterly, semi-annually, or annually.

The steps for calculating savings interest for customers can be quite tedious, however, the Franktek Microsystems software performs all those tasks automatically. Talk to us today for a quote.



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How to Calculate Sacco/Microfinance Loan EMI on Reducing Balance

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The reducing balance method is a formula used to charge interest on loans based on the outstanding principal.
Unlike the flat rate for loan interest calculation, the reducing balance method is cheaper especially when the loan is paid before maturity since interest for future installments is waived.
In this guide, you’ll use the reducing balance method to calculate an EMI(Equated Monthly Installment) for Sacco members.


Before you begin, ensure you have the below information:
  1. The principal of the Loan
  2. The loan interest per annum usually expressed in percentage(e.g. 18% p.a)
  3.  The repayment period(usually expressed in months). However, in some Saccos or microfinance institutions, the loan repayment period may run on a weekly or a bi-weekly basis although this is not common

Finding the EMI of a Loan in Reducing Balance

When you issue a loan to a client, you should calculate his/her EMI(Equated Monthly Installment).
Since most people seeking loans from banks or microfinance institutions earn their money on a regular basis(e.g. monthly), they need to know how much they are expected to repay in each period.
Bearing this mind, availing this information to the clients as soon as you disburse the loan to them will help them to better manage themselves financially.
The formula for finding the EMI on microfinance, banks, or Saccos is shown below:

Example of EMI Calculation using Reducing Balance Formula

Using the formula above, calculate the EMI of a loan using the information below:

  • Principal – $100, 000/=
  • Interest rate – 18% per annum
  • Number of repayments – 3 months

The first step is converting the annual interest to a monthly interest by dividing it by 12. So, 18% divided by 12 equals to 1.5% or 0.05.

Now, enter the values in the formula


EMI = (100,000 * (0.015+
(0.015 / (((0.015+ 1) ^ 3) – 1))))

EMI = 34,338.30/=

So if you disburse a loan of $100,000/= to a client at the rate of 18% per annum repayable in 3 months, the client should pay an Equated Monthly Installment of $34,338.30/= per month
Once you determine the EMI of the loan using the reducing balance formula, the next step is to calculate the loan repayment schedule.

Calculate Interest and Principal Repayment for the 1st Month

Interest 1st month= Original Pricnipal * 0.015
Interest 1st month= $100, 000 * 0.015 = $1,500/=
Principal Payment 1st month = 34,338.30 – 1,500 = 32,838.30/=

Calculate Interest and Principal Repayment for the 2nd Month

Interest 2nd month= ($100, 000 – principal for 1st month)* 0.015
Interest 2nd month= ($100, 000 – 32,838.30)* 0.015 = $1,007.43/=
Principal Payment 2nd month = 34,338.30 – 1,007.43 = 33, 330.87/=

Calculate Interest and Principal Repayment for the 3rd Month

Interest 3rd month= ($100, 000 – principal for 1st month – principal for 2nd month)* 0.015 = $507.46/=
Interest 3rd month= ($100, 000 – 32,838.30 – 33,330.87)* 0.015 = $507.46/=
Principal Payment 3rd month = 34,338.30 – 1,007.43 = 33, 330.87/=
If you tabulate the above information, you should get the below output:

Working on the reducing balance formula manually or using a spreadsheet application is quite tiring especially if the schedule of the loan spans for more than 3 months or when working with hundreds of Sacco/Microfinance clients.

Therefore, if you want to be more productive in your bank, consider using an application like Frantek Sacco Software.

The software will keep track of all your clients and enable you to create loan accounts while it calculates the schedule in the backend within seconds even for loans with up to 100 repayments periods as shown below.


Download Franktek Sacco Software


In this guide, you’ve used the reducing balance formula to calculate interest for loans. Although this formula is quite complex to work with, it encourages Sacco or microfinance clients because it is cheaper than the flat rate method for loan interest calculation.