Your loan instalment is the same every month, but what it's made of changes completely over time. An amortization schedule is the month-by-month table showing how each payment splits between interest and principal. Reading it tells you the real cost of borrowing and where prepayments do the most good. The free loan calculator builds the full schedule for you.
What “amortization” means
Amortizing a loan means paying it off in equal instalments over a fixed term, so the balance reaches exactly zero on the last payment. Interest is always charged on the outstanding balance, which shrinks each month — so even though the payment is fixed, the interest portion falls and the principal portion rises as you go.
The interest/principal split
Each month: interest = current balance × monthly rate; the rest of the payment reduces the principal. Early on the balance is large, so most of the payment is interest and barely any touches the principal. Near the end the balance is tiny, so almost the whole payment is principal.
Worked example
A ₹5,00,000 loan at 10% for 5 years — EMI ≈ ₹10,624:
| Month | Interest | Principal |
| 1 | ₹4,167 | ₹6,457 |
| 30 (halfway) | ₹2,371 | ₹8,253 |
| 60 (last) | ₹88 | ₹10,536 |
Same ₹10,624 payment throughout, but the interest share collapses from ₹4,167 to almost nothing. Total interest over the loan ≈ ₹1,37,440 on top of the ₹5,00,000 borrowed.
Why prepaying early saves the most
A prepayment goes straight to principal, which permanently removes all the future interest that balance would have generated. Because early balances are largest, a prepayment in year 1 wipes out far more interest than the same amount in year 4. If your loan allows penalty-free part-prepayments, the earlier the better. The EMI calculator covers the payment formula itself, and compound interest shows the mirror image — how balances grow when they're working for you.
FAQ
Why is my early payment almost all interest? Interest is charged on the outstanding balance, which is highest at the start.
Does a longer tenure cost more? Yes — a lower monthly payment but more total interest, because you borrow for longer.
When should I prepay? As early as possible — early prepayments cancel the most future interest.
Is my data private? Yes — the calculator runs in your browser and stores nothing.