# Loan amortization schedule explained: why early EMIs are mostly interest

> On a 20-year home loan, your first EMI sends about 80% of its money to interest. This guide builds the schedule month by month, shows the exact month the balance tips the other way, and tests what extra payments really save.

Published 2026-10-09 by Toolcloak. 3 minute read. Original: https://toolcloak.pages.dev/articles/loan-amortization-schedule-explained-why-early-emis-are-mostly-interest
Related free tool: [Loan Amortization Calculator](https://toolcloak.pages.dev/tools/loan-amortization-calculator)

An **amortization schedule** is the full table of a loan: every instalment, split into the part that pays interest and the part that reduces what you owe. Banks send it as a statement; most borrowers never read it. It explains almost everything that feels odd about a loan, such as why the balance barely moves in year one.

> **In short**
> - Each month, **interest = outstanding balance × monthly rate**. The rest of the EMI reduces the balance.
> - On a ₹30 lakh loan at 8.5% for 20 years, the EMI is **₹26,035**. In month 1, **₹21,250** of it is interest and only **₹4,785** is principal.
> - The split flips in **month 143**, nearly 12 years in, when principal first beats interest.
> - Total interest is **₹32.48 lakh**, more than the loan itself. Extra payments early on save the most.

## How one month is calculated

Take the example loan: **₹30,00,000 at 8.5% a year for 20 years**. The monthly rate is 8.5% ÷ 12 = 0.7083%. The EMI formula gives ₹26,035 a month. Every month then follows the same three steps.

**Month 1 of the example loan**

1. **Interest for the month.** ₹30,00,000 × 0.7083% = **₹21,250**.
2. **Principal repaid.** EMI ₹26,035 − interest ₹21,250 = **₹4,785**.
3. **New balance.** ₹30,00,000 − ₹4,785 = **₹29,95,215**.
4. **Repeat.** Month 2 charges interest on ₹29,95,215, so interest dips slightly to ₹21,216 and principal rises to ₹4,819.

*The EMI never changes. Only the split moves, a little each month, because the balance shrinks.*

Try it: [Loan Amortization Calculator](https://toolcloak.pages.dev/tools/loan-amortization-calculator). Enter amount, rate and tenure to see every month's interest, principal and balance.

## The schedule at a glance

| Month | Interest | Principal | Balance left |
| --- | --- | --- | --- |
| 1 | ₹21,250 | ₹4,785 | ₹29,95,215 |
| 12 | ₹20,864 | ₹5,171 | ₹29,40,293 |
| 60 (year 5) | ₹18,778 | ₹7,256 | ₹26,43,815 |
| 120 (year 10) | ₹14,952 | ₹11,083 | ₹20,99,815 |
| 180 (year 15) | ₹9,108 | ₹16,926 | ₹12,68,962 |
| 240 (last) | ₹183 | ₹25,852 | ₹0 |

*After five years you have paid about ₹15.6 lakh in EMIs but cleared only about ₹3.56 lakh of the loan.*

**Where each EMI goes, month by month (₹ thousand)**

| Month | Interest part | Principal part |
| --- | --- | --- |
| 1 | 21250 | 4785 |
| 24 | 20407 | 5628 |
| 48 | 19368 | 6667 |
| 72 | 18137 | 7898 |
| 96 | 16679 | 9356 |
| 120 | 14952 | 11083 |
| 144 | 12906 | 13128 |
| 168 | 10483 | 15552 |
| 192 | 7612 | 18422 |
| 216 | 4212 | 21823 |
| 240 | 183 | 25852 |

*The two lines cross at month 143. Before that point, most of every payment is the cost of borrowing.*

## The year-by-year view

**Interest paid in each year (₹ thousand)**

|  | Value |
| --- | --- |
| Y1 | ₹253k |
| Y3 | ₹242k |
| Y5 | ₹229k |
| Y8 | ₹204k |
| Y10 | ₹184k |
| Y13 | ₹147k |
| Y16 | ₹100k |
| Y20 | ₹14k |

*Year 1 interest is ₹2.53 lakh. In year 20 it is only ₹14,000. The loan gets cheaper to carry the longer you hold it.*

**The example loan in four numbers**

|  | Value | Note |
| --- | --- | --- |
| Monthly EMI | ₹26,035 | Fixed for 240 months |
| Total paid | ₹62.48 L | EMI × 240 |
| Total interest | ₹32.48 L | 108% of the loan |
| Principal passes interest | Month 143 | About 11 years 11 months |

*Total interest is the sum of all 240 interest figures. It is not 8.5% × 20 years, because the balance falls as you pay.*

## Why the first years are so expensive

Interest is charged on what you still owe, and at the start you owe everything. A larger balance means more interest, which leaves less of the fixed EMI to reduce the balance. The balance then falls slowly at first, and faster later, like a snowball in reverse.

**Where the first year's EMIs go**

|  | Share |
| --- | --- |
| Interest | ₹2.53 L (81%) |
| Principal | ₹0.60 L (19%) |

*Year 1 EMIs total ₹3,12,416. Only about 19 paise of each rupee reduces the loan.*

> **Why this matters if you sell early:** If you sell or switch lenders in year 3 or 4, your balance will still be about ₹27–28 lakh on a ₹30 lakh loan. Home loan borrowers are often surprised by how little equity they have built early on.

## Tenure changes the total cost a lot

A longer tenure lowers the EMI but raises total interest sharply. Same loan, same 8.5% rate:

| Tenure | EMI | Total interest | Interest as % of loan |
| --- | --- | --- | --- |
| 10 years | ₹37,196 | ₹14.63 L | 49% |
| 15 years | ₹29,542 | ₹23.18 L | 77% |
| 20 years | ₹26,035 | ₹32.48 L | 108% |
| 25 years | ₹24,157 | ₹42.47 L | 142% |
| 30 years | ₹23,067 | ₹53.04 L | 177% |

*Going from 20 to 30 years cuts the EMI by only ₹2,968 a month but adds ₹20.6 lakh of interest.*

**Total interest on ₹30 lakh at 8.5% (₹ lakh)**

|  | Interest |
| --- | --- |
| 10 years | 14.6 |
| 15 years | 23.2 |
| 20 years | 32.5 |
| 25 years | 42.5 |
| 30 years | 53.0 |

*Each extra five years adds more interest than the five years before it.*

## Rate changes

| Rate | EMI | Total interest |
| --- | --- | --- |
| 7.5% | ₹24,168 | ₹28.00 L |
| 8.5% | ₹26,035 | ₹32.48 L |
| 9.5% | ₹27,964 | ₹37.11 L |

*Each full percentage point moves the EMI by about ₹1,900 and the lifetime interest by about ₹4.5 lakh.*

On a floating-rate loan, a rate change usually keeps the EMI the same and changes the tenure instead, or the reverse. Check your sanction letter. The schedule is recalculated from the current balance each time.

## What extra payments save

Any extra amount goes straight to principal, so it removes all the interest that balance would have collected for the rest of the loan. We ran two simple plans on the same loan.

**Two ways to prepay the example loan**

| One extra EMI each year | ₹5,000 extra every month |
| --- | --- |
| Saves ₹6.17 L | Saves ₹12.73 L |
| Loan ends in 201 months (16 years 9 months) | Loan ends in 164 months (13 years 8 months) |
| Total interest ₹26.31 L instead of ₹32.48 L | Total interest ₹20.75 L |
| About 3 years 3 months sooner | About 6 years 4 months sooner |

*₹5,000 a month is ₹60,000 a year, close to two extra EMIs. The monthly plan saves about twice as much because the money arrives earlier and more often.*

> **Check prepayment rules:** Floating-rate home loans to individuals generally carry no prepayment penalty in India, but fixed-rate loans, business loans and some other products may. Ask your lender for the rule in writing and tell them to reduce tenure or EMI as you prefer.

## Reading a real bank statement

1. **Find the outstanding principal.** This is the number that matters if you want to close the loan today.
2. **Check the rate applied** in each period, especially after a rate reset.
3. **Add up interest paid** for the financial year. It is needed for tax certificates and deduction claims.
4. **Look for pre-EMI interest.** On under-construction homes you may pay interest only until possession.
5. **Compare the schedule** with the calculator. Small differences come from the day count and rounding.

## Frequently asked questions

### What is an amortization schedule?

It is a table showing every instalment of a loan, split into interest and principal, with the balance left after each payment.

### Why is most of my early EMI interest?

Interest is charged on the outstanding balance, which is largest at the start. The EMI is fixed, so a bigger interest share leaves less to reduce the principal.

### How is interest calculated each month on a reducing balance loan?

Monthly interest is the opening balance multiplied by the annual rate divided by 12. Principal repaid is the EMI minus that interest.

### When does the principal part overtake the interest part?

It depends on rate and tenure. On a ₹30 lakh loan at 8.5% for 20 years it happens in month 143. Higher rates and longer tenures push it later.

### Does paying one extra EMI a year help?

Yes. On the example loan it shortens the term by about 3 years 3 months and saves about ₹6.2 lakh of interest.

### Is it better to reduce tenure or EMI after prepaying?

Reducing tenure saves more total interest. Reducing the EMI gives more monthly cash flow. Choose based on your budget and how stable your income is.