ToolFoxHow Home Loan EMI Is Calculated in India (2026)
20 September 2026 · 6 min read
An EMI, or Equated Monthly Instalment, is the fixed amount you pay the bank every month until a loan is cleared. It bundles two things into one payment: a slice of the money you borrowed (the principal) and the interest the bank charges for lending it. The amount stays the same each month, but the split between principal and interest shifts steadily over the life of the loan.
Understanding that split is the difference between feeling trapped by a loan and using it wisely. This guide explains exactly how the number is arrived at, and you can try any figures yourself in the EMI calculator.
The formula banks actually use
Every lender in India uses the same standard reducing-balance formula: EMI = P × r × (1+r)^n ÷ ((1+r)^n − 1). Here P is the loan amount, n is the number of monthly instalments (years × 12), and r is the monthly interest rate, which is the annual rate divided by 12 and then by 100.
For example, a loan of ₹10,00,000 at 8.5% per year over 20 years has a monthly rate of 0.7083% and 240 instalments. Plug those in and the EMI works out to roughly ₹8,678 a month. Over the full tenure you repay about ₹20.8 lakh, of which nearly ₹10.8 lakh is interest — more than the amount you originally borrowed.
Why early EMIs are mostly interest
The word "reducing-balance" is the key. Interest each month is charged only on the principal still outstanding. At the start the outstanding amount is large, so most of your EMI goes to interest and only a little chips away at the principal. As the balance falls, the interest portion shrinks and more of each EMI goes to principal.
This is why a loan barely seems to move in its first few years, then clears quickly near the end. It also explains why prepaying early saves far more than prepaying late: an early prepayment removes principal that would otherwise have attracted interest for the entire remaining tenure.
Tenure vs interest rate: which matters more?
Stretching the tenure lowers the monthly EMI, which feels good, but it sharply raises the total interest because the money is borrowed for longer. A shorter tenure means a higher EMI but far less interest overall.
A lower interest rate, on the other hand, reduces both the EMI and the total interest at once, which is why refinancing to a better rate or negotiating with your lender is almost always worth the effort. Compare a few scenarios side by side in the EMI calculator before you commit.
Fixed vs floating rates
A fixed-rate loan keeps the same interest rate, and therefore the same EMI, for the whole tenure (or a fixed initial period). A floating-rate loan is linked to an external benchmark, so when the benchmark moves your rate moves with it. When that happens, banks usually keep the EMI the same and change the tenure, or keep the tenure and change the EMI.
Floating rates are cheaper on average over long tenures but carry uncertainty; fixed rates cost a little more for the comfort of a predictable payment. Neither is universally better — it depends on where rates are heading and how much payment certainty you value.
Tax benefits worth knowing
Home loans carry specific tax deductions in India. Under Section 24(b), the interest paid on a home loan for a self-occupied property is deductible up to a yearly limit, and under Section 80C the principal repayment counts within that section's overall limit. The exact caps and whether they apply depend on the tax regime you choose and current rules, so treat this as a prompt to check rather than a final figure — the income tax calculator and a quick word with a tax professional will give you the number for your situation.