How Much of My EMI Is Interest? Reading an Amortization Schedule

The short answer

In the early years of a loan, most of each EMI is interest and only a small part reduces the loan. For a ₹30 lakh home loan at 8.5% for 20 years, the EMI is about ₹26,035, and in the first month ₹21,250 of it is interest and only ₹4,785 is principal. The split slowly flips; principal only overtakes interest in month 143, almost 12 years in. You can see this month by month in the amortization schedule of the free EMI Calculator.

What an amortization schedule is

An amortization schedule is a table with one row per EMI. The Lazyblink EMI Calculator shows five columns:

Column	What it means
Month	The EMI number, starting at 1
EMI	The fixed amount you pay each month
Principal	The part of this EMI that reduces your loan
Interest	The part of this EMI that is the bank's interest for the month
Balance	The loan still outstanding after this EMI

Every row follows the same rule:

Interest = outstanding balance × (annual rate ÷ 12)

Principal = EMI − interest

New balance = old balance − principal

Because the balance is largest at the start, the interest is largest at the start. As the balance falls, less of the fixed EMI goes to interest and more goes to principal.

A worked example: ₹30 lakh at 8.5% for 20 years

The monthly rate is 8.5% ÷ 12 = 0.7083%. The EMI works out to ₹26,035 (₹26,034.70). Over 240 months you pay ₹62,48,328, of which ₹32,48,328 is interest, more than the loan itself.

Here is how individual EMIs split:

Month	Principal	Interest	Balance after EMI
1	₹4,785	₹21,250	₹29,95,215
12	₹5,171	₹20,864	₹29,40,293
60	₹7,256	₹18,778	₹26,43,815
120	₹11,083	₹14,952	₹20,99,814
143	₹13,036	₹12,999	—
180	₹16,926	₹9,108	₹12,68,961
240	₹25,852	₹183	₹0

Month 1 interest is easy to check: ₹30,00,000 × 0.085 ÷ 12 = ₹21,250.

Year by year

Adding up the rows gives a clearer picture:

• First year: you pay ₹3,12,416 in EMIs. Interest is ₹2,52,709 and principal only ₹59,707.
• First 5 years: interest ₹12,05,897, principal ₹3,56,185. After five years of payments you still owe about ₹26.4 lakh.
• First 10 years: interest ₹22,23,978, principal ₹9,00,186. Half the tenure is over, but you have repaid less than a third of the loan.
• Last year: interest ₹13,921, principal ₹2,98,496.

This is why people are surprised by their outstanding balance when they check it a few years into a home loan.

How to view the schedule in the EMI Calculator

Open the EMI Calculator.

Enter the loan amount, the annual interest rate and the tenure. Tenure can be entered in months or years.

Read the EMI, total payment and total interest.

Click Show amortization schedule to open the month-by-month table. It scrolls inside its box.

Look for the row where the Principal column first becomes larger than the Interest column. That is your crossover point.

The schedule lists up to 360 months (30 years). Amounts are rounded to the nearest rupee on screen.

What the schedule tells you about decisions

Prepaying early saves the most

Any extra payment goes straight to principal, which cuts every future month's interest. A lump sum in year 2 removes interest that would have been charged for the remaining 18 years; the same amount in year 18 saves only two years of interest. If you plan to prepay, earlier is better. Check your loan agreement for prepayment charges first; many floating-rate home loans to individuals do not have them, but some loans do.

A shorter tenure changes the split from day one

The same ₹30 lakh at 8.5% over 10 years has an EMI of about ₹37,196. Month 1 interest is still ₹21,250 (it depends only on the balance and rate), but principal is ₹15,946 instead of ₹4,785. Total interest drops to ₹14,63,485, less than half the 20-year figure. For more on this trade-off, see home loan tenure: 15, 20 or 30 years.

Smaller loans follow the same pattern, faster

An ₹8 lakh car loan at 9% over 5 years has an EMI of about ₹16,607. In month 1, ₹6,000 is interest and ₹10,607 is principal. Shorter loans reach the crossover point sooner, often in the first month, because the balance is small relative to the EMI.

Things the schedule does not show

• Rate changes. The calculator assumes the rate stays fixed for the whole tenure. On a floating-rate loan, the bank will change either your EMI or your tenure when rates move, and your real schedule will differ.
• Fees and insurance. Processing fees, loan insurance premiums and late-payment charges are not included.
• Pre-EMI or moratorium periods. If interest was added during a construction phase or moratorium, the starting balance is higher. See what an EMI moratorium is.
• Your bank's rounding. Banks may round daily interest or EMIs slightly differently, so their statement can differ by a few rupees.

Reading your bank's schedule

Banks usually provide a repayment schedule on request or in net banking. It uses the same columns, sometimes with an opening balance column added. Compare it with the calculator using the same loan amount, rate and tenure. If the totals are far apart, ask the bank whether there were fees added to the principal, a pre-EMI period, or a rate change you missed.

Quick checks

• Month 1 interest should equal loan × annual rate ÷ 12.
• Principal + interest in any row should equal the EMI.
• Balance should fall every month and reach zero in the last row.
• Total interest should equal EMI × number of months − loan amount.

For the EMI formula itself and how each input affects it, read the EMI calculator guide.