Home Loan EMI Calculator

How a home loan EMI is worked out

A home loan is an annuity in reverse. The lender finds the single instalment that, paid every month for the whole tenure, clears both the principal and all the interest that accrues on the balance still outstanding along the way:

EMI = P × r × (1 + r)ⁿ ÷ ((1 + r)ⁿ − 1)

P is the amount sanctioned, n is the number of monthly instalments and r is the monthly rate — the annual rate divided by twelve and by a hundred. On ₹50 lakh at 8.5% for 20 years, r is 0.0070833 and n is 240, which gives an EMI of about ₹43,391. Over the full term that is roughly ₹1.04 crore repaid, of which ₹54.14 lakh is interest. You pay for the house twice, near enough, and the second payment is invisible because it arrives in instalments.

The words that matter are balance still outstanding. Interest each month is charged only on what you owe at the start of that month, which is the reducing-balance method. It is worth knowing the alternative exists: a flat rate, still quoted by some vehicle financiers and small NBFCs, charges interest on the original amount for the entire tenure. On a three-to-five-year loan that works out to roughly 1.75 times the headline rate once you restate it on a reducing balance — a "10% flat" car loan is around 17% to 18% in the terms your home loan is quoted in. Housing loans from banks and housing finance companies are not written this way, so if a home loan offer looks cheaper than everything else on the table, look at the fees rather than the method.

Why the first years are almost entirely interest

On that ₹50 lakh loan, the first instalment splits into ₹35,417 of interest and ₹7,974 of principal. Around 82 paise in every rupee is rent on the money. The split shifts slowly at first — it is not until month 143, nearly twelve years in, that more of your EMI goes to principal than to interest. Expand the year-by-year schedule above and the balance column tells the same story: after five years of paying ₹43,391 a month, more than ₹44 lakh of the original ₹50 lakh is still outstanding.

This has one consequence worth acting on. A rupee prepaid in year two removes far more interest than the same rupee prepaid in year fifteen, because it is subtracted from the balance that every remaining month's interest is calculated on. Prepay ₹10,000 a month from the start of that loan and it clears in 12 years and 11 months rather than 20, saving about ₹21.79 lakh in interest. Those extra payments add up to ₹15.5 lakh over the 155 months the loan now runs, so each rupee prepaid removes roughly ₹1.40 of interest and the total handed to the lender falls from about ₹1.04 crore to ₹82.35 lakh. The same ₹10,000 a month started in year fifteen would save a small fraction of that, because most of the interest has already accrued.

Floating rates and the tenure that grows quietly

Most home loans in India are floating-rate, linked to an external benchmark — for the majority of lenders the RBI repo rate — plus a spread fixed at sanction. Linking a floating-rate retail loan to an external benchmark is a requirement of RBI's directions on interest rates, not a lender's choice. When the benchmark moves, your loan is repriced at the next reset date.

The part that catches borrowers out is what the lender adjusts. The default is to hold the EMI steady and extend the tenure. On the ₹50 lakh loan above, a one percentage point rise from 8.5% to 9.5% early in the term pushes the remaining schedule from 240 months to around 309 — nearly six extra years of instalments — while your bank statement shows exactly the same debit as last month. Nothing prompts you to notice, which is precisely the problem.

RBI's framework on floating-rate resets is designed to stop that happening silently. At the time of reset your lender must give you the option to switch to a fixed rate, to increase the EMI rather than the tenure, or to prepay in part or in full, and must communicate the revised tenure to you. Those options are yours to exercise, not the lender's to apply — if you do nothing, the tenure extension is what you get.

The other rule in your favour: on a floating-rate loan taken by an individual for a non-business purpose, a lender may not levy a foreclosure or prepayment penalty. You can pay a lump sum, set up a recurring extra payment, or move the whole loan to a cheaper lender without a charge on the amount prepaid. Fixed-rate loans carry no such protection and usually do charge.

What a home loan does and does not do for your tax

This is the single most misunderstood part of a home loan in India, and getting it wrong can cost a great deal more than the EMI difference between two lenders.

Under the old regime, a home loan on a house you live in gives you two separate reliefs: a capped deduction for the interest you pay, and a deduction for the principal repaid, which shares its ceiling with your other eligible investments. Under the new regime, which is now the default, neither of those is available for a self-occupied property. Not a reduced version — none of it.

There is one important exception, and it is the source of most of the confusion. Interest on borrowed capital for a let-out property remains deductible under the new regime at its actual amount, against the rental income from that property. So a landlord and an owner occupier with identical loans are treated completely differently. If you are weighing the two regimes and a home loan is part of the calculation, work out the tax both ways on the income tax calculator rather than assuming the loan tilts it. A salaried borrower on a self-occupied house can easily still be better off in the new regime despite losing both deductions — whether that is true of you is an arithmetic question, not a rule of thumb.

What this calculator cannot tell you

• What rate you will be offered. That depends on your credit score, income, employer category, loan-to-value ratio and whatever the lender is running that quarter. We deliberately publish no bank rate table here, because a rate that is stale is worse than no rate at all.
• The cost of the transaction. Processing fees, legal and technical valuation, documentation charges and GST are usually deducted from the disbursal, so you borrow the sanctioned amount and receive rather less. Stamp duty and registration sit on top of the property price entirely.
• Pre-EMI on an under-construction property. Until the last tranche is disbursed, most lenders charge interest only on what has actually been released. That period costs you money without reducing the loan by a rupee, and it is not in the schedule above.
• Whether prepaying is your best use of the money. The interest saved is certain, which is a genuine advantage. Whether it beats what the same money would do elsewhere depends on returns nobody can promise you.

Two habits make the numbers above behave in your favour. Choose the shortest tenure whose EMI you could still service in a bad month rather than a good one — on ₹50 lakh at 8.5%, going from 20 years to 30 saves ₹4,945 a month and costs about ₹34.27 lakh in extra interest. And when your income rises, raise the prepayment rather than the lifestyle. The schedule above rewards early money more generously than almost anything else available to a household balance sheet.