You take a ₹10 lakh home loan and the bank says the EMI is ₹8,678. A year later the loan statement says you still owe ₹9,80,098 - after paying ₹1,04,139 in EMIs, the loan has come down by less than ₹20,000. Most people's first reaction is that something is wrong. It is not; it is how every EMI works.
This guide explains EMI in four steps: what it is, why it is built that way, worked examples of what changes it, and a short summary to keep.
What an EMI is
An EMI (Equated Monthly Instalment) is the same fixed amount you pay every month until a loan is repaid. Each EMI has two parts: interest on what you still owe, and principal - the part that actually reduces the loan.
EMI = P × r × (1 + r)^n ÷ ((1 + r)^n − 1)
P = loan amount
r = yearly interest rate ÷ 12 ÷ 100 (the monthly rate)
n = number of monthly instalmentsFor ₹10,00,000 at 8.5% for 20 years: r = 8.5 ÷ 12 ÷ 100 = 0.007083, n = 240. Put them in and the EMI comes to ₹8,678.23. You do not need to do this by hand - the calculator below does it as you type - but it helps to know there is no hidden number in it.
Why your first EMIs are mostly interest
Every month, interest is charged on what you still owe. At the start you owe the most, so most of the EMI goes to interest. As the loan shrinks, the interest part shrinks too, and more of the same EMI pays off the loan.
| ₹10 lakh at 8.5% for 20 years | Interest paid | Loan repaid |
|---|---|---|
| Year 1 | ₹84,237 | ₹19,902 |
| Year 20 | ₹4,640 | ₹99,498 |
Same EMI, very different split. In year 1, over 80% of what you pay is interest; in year 20, under 5% is. That is why prepaying early saves so much more than prepaying late - covered in the prepayment guide below.
Remember: The EMI never changes, but its split does: interest first, principal later.
What the tenure does
The longer the loan, the lower the EMI - but the more interest you pay, because you owe money for longer. ₹10 lakh at 8.5%:
| Tenure | EMI | Total interest | Total you pay |
|---|---|---|---|
| 10 years | ₹12,399 | ₹4,87,828 | ₹14,87,828 |
| 15 years | ₹9,847 | ₹7,72,531 | ₹17,72,531 |
| 20 years | ₹8,678 | ₹10,82,776 | ₹20,82,776 |
| 25 years | ₹8,052 | ₹14,15,681 | ₹24,15,681 |
| 30 years | ₹7,689 | ₹17,68,089 | ₹27,68,089 |
Going from 20 to 30 years lowers the EMI by only ₹989 a month, but adds ₹6,85,313 of interest. Going from 20 to 15 years raises the EMI by ₹1,169, and saves ₹3,10,245.
What the interest rate does
Half a percent sounds small. On a ₹30 lakh, 20-year home loan it is not:
| Rate | EMI | Total interest |
|---|---|---|
| 8.0% | ₹25,093 | ₹30,22,369 |
| 8.5% | ₹26,035 | ₹32,48,327 |
| 9.0% | ₹26,992 | ₹34,78,027 |
| 9.5% | ₹27,964 | ₹37,11,345 |
| 10.0% | ₹28,951 | ₹39,48,156 |
Every 0.5% is roughly ₹950 a month and ₹2.3 lakh over the loan. When you compare lenders, compare the rate first; then ask what happens to it when the repo rate moves, because most home loans in India are on a floating rate.
Car and personal loans: short, but dearer
| Loan | EMI | Total interest |
|---|---|---|
| Car loan: ₹8 lakh at 9.5% for 5 years | ₹16,801 | ₹2,08,089 |
| Personal loan: ₹3 lakh at 13% for 3 years | ₹10,108 | ₹63,895 |
Short loans pay much less interest in rupees because they end quickly - but their rates are higher, so per rupee borrowed they cost more. A personal loan at 13% is worth clearing before you prepay a home loan at 8.5%.
Banks round each month's interest and EMI to the rupee, and some charge interest from the disbursement date rather than a month start, so your statement can differ from the formula by a rupee or two. Processing fees and loan insurance are extra.
The short version
An EMI is a fixed monthly payment made of interest on what you owe plus a part that repays the loan: EMI = P × r × (1 + r)^n ÷ ((1 + r)^n − 1). Early EMIs are mostly interest and late ones mostly principal. A longer tenure lowers the EMI a little but raises the interest a lot; a lower rate saves about ₹950 a month for every 0.5% on a ₹30 lakh loan.
- Fixed EMIThe amount stays the same; the split changes.
- Interest firstYear 1 is mostly interest, the last year mostly principal.
- TenureLonger = lower EMI, much more interest.
- RateEvery 0.5% matters - compare it first.
- Short loansHigher rates: clear them before cheaper ones.
- Check itUse the EMI calculator with your own numbers.
Questions people ask
How is EMI calculated?
EMI = P × r × (1 + r)^n ÷ ((1 + r)^n − 1), where P is the loan, r is the yearly rate ÷ 12 ÷ 100 and n is the number of months. For ₹10 lakh at 8.5% for 20 years it is ₹8,678.
Why has my loan barely come down after a year of EMIs?
Because early EMIs are mostly interest. On ₹10 lakh at 8.5% for 20 years, the first year's EMIs pay ₹84,237 of interest and only ₹19,902 of principal.
Is a longer tenure better?
It lowers the EMI, but you pay much more interest. 30 years instead of 20 on ₹10 lakh at 8.5% saves ₹989 a month and costs ₹6.85 lakh more in interest.
What is the EMI on a ₹30 lakh home loan?
At 8.5% for 20 years, about ₹26,035 a month, with about ₹32.5 lakh of interest over the loan.
Does the EMI change when the repo rate changes?
On a floating-rate loan, the lender usually keeps the EMI and changes the tenure, or changes the EMI, when its rate moves. Ask your lender which it does and whether you can choose.
This article is for education, not financial advice. Rates and terms differ by lender - check your loan agreement or ask your bank before deciding.
Educational only. This article explains how things work. It is not investment, tax, legal or career advice, and it is not a recommendation to buy or sell anything. What suits you depends on your own situation - check with a qualified adviser before acting on money decisions.