Loans & Credit
Published on September 24, 2025
A home loan payment uses the amortisation formula: EMI = P x r x (1+r)^n / ((1+r)^n - 1), where P is the loan after your down payment, r the annual rate divided by 12, and n the number of months. Borrowing 3,000,000 at 9% over 20 years costs 26,992 a month, and you repay 6,478,027 in total, of which 3,478,027 is interest.
Published by PraxisCalc, a Zeta Digilux Labs project
Buying a home is a major life milestone, and for most people, it involves taking out a home loan, also known as a mortgage. Understanding the components of a home loan is the first step toward making a confident and informed purchasing decision.
When you start exploring home loans, you'll encounter a few key terms that determine the structure of your loan and your monthly payments.
The Property Price is the total cost of the home. Your Down Payment is the initial, upfront portion of this price that you pay out-of-pocket. The remaining amount is what you borrow from the lender, which becomes your principal loan amount. A larger down payment (typically 20% or more) can result in a lower interest rate and allows you to avoid Private Mortgage Insurance (PMI).
The interest rate is the percentage of the loan amount that the lender charges you for borrowing the money. It's one of the most significant factors affecting your monthly payment and the total cost of the loan over its lifetime.
The tenure is the total length of time you have to repay the loan. Common terms for home loans are 15 or 30 years. A longer tenure will result in lower monthly payments, but you will pay significantly more in total interest. A shorter tenure means higher monthly payments but less interest paid overall.
See how these factors come together to determine your monthly mortgage payment. Our Home Loan Calculator makes it easy to experiment with different scenarios.
Use the Home Loan Calculator →Your monthly payment, or EMI, is calculated based on the principal loan amount, the interest rate, and the loan tenure. The formula ensures that you pay off the loan completely by the end of the term. In the early years, most of your payment goes toward interest, while in the later years, more goes toward paying down the principal.
A fixed-rate home loan locks your interest rate for the entire term, so your principal-and-interest payment never changes regardless of what market rates do afterward. This gives predictability but usually starts at a somewhat higher rate than the floating alternative, since the lender is pricing in the risk of rates rising during a long loan term. A floating (adjustable) rate moves with a reference index, so your payment can rise or fall over time; it often starts lower, which is why it can look more attractive during the affordability check, but it carries genuine payment-uncertainty risk over a 20 to 30 year term. Borrowers who expect to sell or refinance within a few years, or who have room in their budget to absorb a higher payment, are the ones best positioned to take on floating-rate risk in exchange for a lower starting rate.
Because home loan EMIs are structured so that interest dominates the early payments, extra principal payments made early in the loan term save far more total interest than the same extra payment made near the end. Even a modest additional payment applied directly to principal, made consistently in the first several years, can shorten a 30-year loan by multiple years and save a meaningful fraction of total interest paid. Before committing to a prepayment strategy, confirm your loan doesn't carry a prepayment penalty, and check whether your lender requires you to specify that extra payments should reduce principal rather than being held as an advance regular payment.
Beyond the down payment, a home purchase typically involves closing costs, appraisal fees, title insurance, loan origination fees, and prepaid items like the first year's homeowner's insurance and initial escrow deposit, which together commonly run a few percent of the purchase price. Underestimating these upfront costs is one of the most common budgeting mistakes first-time buyers make, since a buyer can be fully qualified for the loan itself but still come up short on cash needed to actually close. Get an itemized closing-cost estimate from your lender well before your target closing date so there are no last-minute surprises.
Many home loans require an escrow account, into which a portion of your monthly payment is set aside for property taxes and homeowner's insurance, which the lender then pays on your behalf when those bills come due. This spreads a large annual or semi-annual expense into smaller monthly amounts, reducing the risk of a missed tax or insurance payment, though it also means your total monthly payment (principal, interest, taxes, and insurance combined) is higher than the loan's principal-and-interest figure alone. Because tax assessments and insurance premiums can change year to year, expect an annual escrow analysis from your servicer that may adjust your monthly payment up or down to keep the account properly funded.
Subtract the down payment from the property price to get the loan amount, then apply the amortisation formula. For 3,000,000 at 9% over 20 years, r is 0.0075 and n is 240, giving a monthly payment of 26,992.
Multiply the monthly payment by the number of months, then subtract the principal. In the example that is 26,992 x 240 = 6,478,027, less 3,000,000, so 3,478,027 goes to interest. Over long terms the interest often exceeds the amount borrowed.
It reduces the principal directly and proportionally. Raising a down payment so the loan falls from 3,000,000 to 2,500,000 cuts the monthly payment to about 22,493 and saves roughly 580,000 of interest over the term.
It lowers the monthly payment but raises the total cost, because the balance stays outstanding longer. Stretching 20 years to 25 reduces the payment but adds hundreds of thousands in interest. It is a cash-flow decision, not a saving.
Only principal and interest. Property tax, home insurance, any mortgage insurance and society or maintenance charges sit on top. Lenders assess you against the full monthly obligation, so budget for that rather than the EMI alone.
A lump sum applied to principal removes all the future interest that balance would have generated. The earlier it lands the more it saves, because early payments are mostly interest. Ask whether prepayment shortens the tenure or lowers the EMI, since shortening saves far more.
On a floating rate loan most lenders hold the EMI steady and extend the tenure instead, so a rate rise quietly adds months rather than raising the payment. Check which method your agreement uses, because the cost difference is substantial.
A home loan is a long-term financial commitment. By understanding the core components and using tools to calculate your potential monthly payments, you can approach the home-buying process with a clear understanding of what you can afford, helping you find a home that fits both your lifestyle and your budget. For official guidance on this topic, see the CFPB's home-buying resources.
A home loan decision should include more than the headline EMI. Estimate down payment, closing costs, property taxes, homeowners insurance, maintenance, and any mortgage insurance before deciding what you can afford. Small changes in interest rate or loan term can shift both the monthly payment and total interest by a large amount over the life of the loan.
Start with the Home Loan Calculator, then compare a full mortgage payment in the Mortgage Calculator and affordability in the Loan Affordability Calculator.
Get a complete understanding of how your Equated Monthly Installment (EMI) is structured.
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