What is Amortization?
financeDefinition
Amortization is the process of spreading a loan repayment over time through regular installments (EMIs). Each payment covers both interest and a portion of the principal. An amortization schedule is a table showing exactly how much of each EMI goes to interest versus principal reduction across the entire loan tenure.
Detailed Explanation
In loan amortization, the interest portion of each EMI is calculated on the outstanding principal balance. Since the outstanding principal decreases with each payment, the interest component also decreases over time, while the principal repayment portion increases.
This is why making prepayments early in a loan term is so powerful — you reduce the principal balance on which future interest is calculated. A prepayment of ₹50,000 in year 1 of a 20-year home loan can save you over ₹2 lakhs in total interest.
The word 'amortization' comes from the Latin 'amortire' meaning 'to kill off' — you are gradually killing off the loan debt over time.
Reading an amortization schedule
Take the same ₹25 lakh, 8.5%, 20-year loan. The EMI is about ₹21,700 and stays the same every month, but its make-up shifts. In month one roughly ₹17,700 is interest and ₹4,000 is principal. By the final year, almost the entire instalment is principal and only a few hundred rupees are interest.
The schedule is simply that month-by-month table: opening balance, interest charged, principal repaid and closing balance. Lenders must be able to give you this table, and the EMI Calculator generates one so you can see how your own loan behaves.
Why early prepayments save so much
Interest each month is charged on the outstanding balance. A rupee of principal repaid in year one stops generating interest for all the remaining years, and that interest would itself have compounded. A prepayment of ₹50,000 in the first year of this loan can save roughly ₹2 lakh of interest over its life if the EMI stays the same and the tenure shortens.
The same prepayment in year 15 saves far less, because little time is left for interest to build up. If you have spare cash, the first five years are where prepayment works hardest. Do check the loan agreement for prepayment charges before sending a lump sum.
Amortization beyond loans
In accounting, the word also describes spreading the cost of an intangible asset such as a patent or software licence across its useful life. The idea is the same: a large amount is recognised gradually over time. On this site, the term is used in its loan sense.
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