How to read an amortization schedule
An amortization schedule is the month-by-month story of your loan: what each EMI pays in interest, what it repays of the principal, and what you still owe afterwards. It is the single most useful document for understanding why a loan behaves the way it does.
How each row is built
For every month, the lender charges interest on the balance you carried into that month — the annual rate divided by twelve, applied to the outstanding amount. Whatever remains of your fixed EMI after that interest is deducted goes to principal, and the balance falls by exactly that much.
Because the balance is smaller next month, the interest charge is smaller too, so slightly more of the same EMI goes to principal. Repeat that 240 times and you get the familiar curve where progress accelerates towards the end.
The crossover point
On a ₹50 lakh loan at 8.5% for 20 years, the interest portion of the EMI exceeds the principal portion until roughly month 142 — just under twelve years in. Only after that does more than half of each payment actually reduce your debt.
The crossover arrives earlier at lower rates and shorter tenures. It is the clearest argument for prepaying early: before the crossover, your EMIs are mostly rent on the money rather than repayment of it.
Using the schedule in practice
Three checks are worth doing. Confirm the closing balance in the schedule matches your lender statement; if it does not, the rate, the disbursement date, or a fee is different from what you assumed. Check the interest paid in each financial year, which is what tax deductions are based on. And look up the balance at the month you expect a bonus, to size a prepayment.
Note that the final EMI is usually a few rupees different from the rest. Lenders round the EMI to whole rupees, and the last instalment absorbs the accumulated rounding.
First and last EMI compared
- Loan
- ₹50 lakh at 8.5% for 20 years
- EMI
- ₹43,391
- Month 1 — interest
- ₹35,417
- Month 1 — principal
- ₹7,974
- Month 240 — interest
- ≈ ₹305
- Month 240 — principal
- ≈ ₹43,086
The payment never changes, but its job completely inverts. In month one you repay about 18% of the EMI as principal; in the final month you repay 99% of it.