Methods Used by Lenders to Determine and Calculate Home Loan Interest Rates

When applying for a home loan, one of the most critical aspects borrowers consider is the interest rate – a key factor that influences monthly EMIs and the overall cost of the loan.
But have you ever wondered how to calculate the interest rate on a home loan? Understanding how lenders determine and calculate these rates can help you make informed choices, negotiate better terms, and plan your finances more effectively.
This article explains the types of home loan interest rates and the main factors lenders evaluate when setting them.

Types of Home Loan Interest Rates

Home loans generally come with two types of interest rates:

• Fixed Interest Rate: Remains constant throughout the loan tenure, offering greater stability in financial planning through fixed EMIs.
• Floating Interest Rate: Linked to market benchmarks like the RPLR, causing EMIs to vary with interest rate movements.

Key Factors Influencing Home Loan Interest Rates

The final interest rate offered by a lender isn't arbitrary; it’s influenced by both borrower-specific and macroeconomic considerations:

• Credit Score: A score above 700 improves your chances of securing a lower interest rate, as it indicates a strong repayment history.
• Income & Job Stability: Lenders prefer borrowers with steady, verifiable income and stable employment, as it lowers default risk.
• Loan Amount & Tenure: Higher loan amounts and longer tenures may increase the risk for lenders, leading to slightly higher rates.
• Down Payment: A higher upfront payment reduces the lender’s risk, often resulting in more favourable interest rates.
• Type of Employment: Salaried individuals, especially in government or reputed private organisations, are generally perceived as lower-risk compared to self-employed borrowers. 
• Geographic Location & Property Type: Urban properties often attract better rates than those in semi-urban or rural areas due to market demand and resale value.

Benchmarks Used by Lenders to Set Rates

Modern home loan interest rates, particularly floating rates, are linked to specific benchmark rates that reflect broader economic conditions:

• Repo Rate: Set by the Reserve Bank of India (RBI), this rate influences the cost at which commercial financial institutions borrow money. A decrease in the repo rate can lead to lower home loan interest rates.
• Retail Prime Lending Rate (RPLR): This is a benchmark rate set by individual lenders, reflecting the rate at which they lend to their most creditworthy customers. Floating-rate home loans are often pegged to this.  SMFG Grihashakti, for instance, offers floating interest rate home loans linked to the RPLR.
• External Benchmark Lending Rate (EBLR): This links loan rates to external benchmarks such as the repo rate, offering transparency and quick transmission of policy rate changes.

Apply Now

How Interest Is Calculated on Home Loans

Let’s understand this using a home loan of INR 50 lakhs, with an interest rate of 10% p.a., and a loan tenure of 20 years (240 months).

1. How to Calculate the Home Loan Interest Using the EMI Formula

The formula for calculating EMI is:

EMI = [P × r × (1 + r)^n] / [(1 + r)^n – 1]
Where:

• P = Loan amount = 50,00,000
• r = Monthly interest rate = 10% ÷ 12 = 0.00833
• n = Loan tenure in months = 20 × 12 = 240

Plugging in the values:
EMI = [50,00,000 × 0.00833 × (1 + 0.00833)^240] ÷ [(1 + 0.00833)^240 – 1] Therefore, EMI ≈ INR 48,251. 
Total repayment over 20 years = 48,251 × 240 = INR 1,15,80,260
Total interest payable = 1,15,80,260 – 50,00,000 = INR 65,80,260
To skip the manual calculation and get quick results tailored to your loan amount, tenure, and rate, use an online home loan EMI calculator.

2. How to Work Out Home Loan Interest for a Specific Month

To find the interest component of any EMI (say, the first one), we can use Excel's built-in formula:
=IPMT(rate, month_number, total_months, loan_amount)
So, for month 1:

IPMT = 0.00833, 1, 240, 50,00,000 ≈ INR 41,667 
So in the first month, you pay:

• Interest = INR 41,667
• Principal = 48,251 – 41,667 = INR 6,584

As the loan balance reduces each month, the interest portion decreases and the principal portion increases.

How SMFG Grihashakti Determines Competitive Home Loan Rates

SMFG Grihashakti aims to offer home loan interest rates that are both competitive and aligned with responsible lending practices. We take into account factors such as credit history, repayment capacity, employment type, and loan amount to determine a rate tailored to each borrower’s unique financial profile. This ensures that eligible applicants receive favourable terms suited to their specific needs.

Conclusion

Understanding how lenders determine and calculate home loan interest rates – and the key factors that influence them – can help you make informed financial decisions and plan your repayment strategy with confidence.
At SMFG Grihashakti, you can avail of home loans of up to INR 1 crore* with interest rates starting from just 10%* per annum, and flexible tenures of up to 30 years*. Check your eligibility and apply online today!