When you take a home loan, personal loan, car loan, or another type of loan, you usually repay it through monthly instalments. These instalments are known as Equated Monthly Instalments, or EMI.
Your EMI mainly depends on three things: the loan amount, the interest rate, and the loan tenure. A higher loan amount or interest rate generally increases the EMI, while a longer tenure can reduce the monthly payment.
What Is EMI?
EMI stands for Equated Monthly Instalment. It is the amount you pay to the lender every month until the loan is fully repaid.
An EMI generally consists of two parts:
- Principal: The amount used to repay the original loan.
- Interest: The cost charged by the lender for providing the loan.
At the beginning of many loans, a larger portion of the EMI goes towards interest. As you repay the loan, the interest component generally decreases and the principal component increases.
How Is EMI Calculated?
The standard mathematical formula used to calculate EMI is:
EMI = P × R × (1 + R)N ÷ ((1 + R)N − 1)
Where:
- P = Principal loan amount
- R = Monthly interest rate
- N = Number of monthly instalments
If the annual interest rate is given, it is usually converted into a monthly rate before applying the formula. For example, an annual rate of 12% would correspond to a monthly rate of 1% when divided by 12.
Example of EMI Calculation
Suppose you take a loan of ₹5,00,000 at an annual interest rate of 10% for 5 years.
In this example:
- Loan amount = ₹5,00,000
- Annual interest rate = 10%
- Monthly interest rate = 10% ÷ 12 = 0.8333%
- Loan tenure = 5 years
- Total number of monthly payments = 5 × 12 = 60
Using the EMI formula, the monthly EMI would be approximately ₹10,624.
Over 60 months, the total amount paid would be approximately ₹6.37 lakh. The difference between the total repayment and the original ₹5 lakh loan represents the interest paid, subject to the exact loan terms and rounding used by the lender.
How Loan Tenure Affects EMI
Loan tenure has a direct effect on your monthly EMI. If you choose a longer repayment period, the EMI generally becomes lower because the repayment is spread over more months.
However, a longer tenure can also mean paying more interest over the entire loan period.
For example, a ₹5 lakh loan may have a lower monthly EMI over 7 years than over 5 years, but the total interest paid over 7 years can be higher.
How Interest Rate Affects EMI
The interest rate also plays an important role in determining your EMI. If the interest rate increases while the loan amount and tenure remain the same, the EMI generally increases.
This is why comparing interest rates is important when choosing a loan. Even a small difference in the rate can make a noticeable difference in the total interest paid over a long loan tenure.
How Is Principal and Interest Divided in an EMI?
Every EMI payment is divided between principal and interest. The exact split changes throughout the loan repayment period.
In the early stages, the outstanding principal is higher, so the interest component is generally larger. As the outstanding loan balance decreases, the interest charged also decreases and a larger portion of the EMI goes towards principal repayment.
Does EMI Remain the Same Every Month?
For a typical fixed-rate loan with a standard repayment schedule, the EMI generally remains the same throughout the agreed tenure. However, the principal and interest portions within that EMI change over time.
For floating-rate loans, changes in the interest rate can affect the EMI or the loan tenure, depending on the lender's terms.
How Can You Reduce Your EMI?
If you want a lower monthly EMI, there are several factors you can consider:
- Borrow a smaller amount.
- Look for a lower interest rate.
- Choose a longer repayment tenure.
- Make a larger down payment where applicable.
Remember that extending the tenure may reduce your monthly payment but can increase the total interest paid over the life of the loan.
Use an EMI Calculator
Calculating EMI manually can be difficult, especially when you want to compare different loan amounts, interest rates and tenures.
An EMI calculator can quickly estimate your monthly payment, total interest and total repayment amount. You can try different values to understand how changing the loan amount, interest rate or tenure affects your repayment.
Final Thoughts
EMI calculation is based mainly on the loan amount, interest rate and repayment tenure. Understanding these factors can help you compare loans and choose a repayment plan that fits your budget.
Before taking a loan, don't look only at the monthly EMI. Also consider the total interest payable, processing fees, other charges and the complete terms offered by the lender.
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