Why is so much of my early payment going to interest?

Because interest is charged on the outstanding balance, which is at its largest at the start. The split reverses over the life of the loan, and by the final years almost the whole instalment is reducing principal.

Does prepaying early really help that much?

Yes, disproportionately. Principal removed in year two would otherwise have accrued interest for the remaining eighteen years. The same amount paid in year eighteen saves interest on a small balance for two.

Should I choose a longer term for a lower payment?

Only if the monthly figure is genuinely unaffordable otherwise. A longer term costs considerably more in total, because a slower-reducing balance accrues interest for longer. The total interest figure shows the trade plainly.

Is this exactly what my bank will charge?

It is the standard amortisation calculation, so the instalment should match closely. Processing fees, insurance and any difference in how the bank rounds or compounds will move the real figure slightly.

Loan EMI Calculator

Monthly instalment, total interest and a full amortisation table.

Everything runs inside your browser. Your files never leave your device.

Result

The result appears here as you type.

Ask about Loan EMI Calculator

Questions about what this tool does, which option to pick, or what it can and cannot handle.

The question you type here is sent to an AI provider to be answered — your files and whatever you put in the tool above are not, and the assistant cannot see them. Answers are generated and can be wrong. The tool itself is not guessing: it runs deterministic code on your device.

About the Loan EMI Calculator

An EMI is the fixed amount you pay every month on a loan until it is repaid. The figure comes from the standard amortisation formula, and knowing it before you sign is the difference between a decision and a hope.

This calculates the monthly instalment from the principal, the interest rate and the term, and shows the total interest — which is generally the number that changes people's minds.

The amortisation split is worth understanding because it explains a lot of confusion about home loans. Every instalment covers interest on the outstanding balance first, and only the remainder reduces the principal. Early in a long loan the balance is large, so most of the payment is interest and the debt barely moves. On a twenty-year loan at nine per cent, roughly three-quarters of the first year's payments are interest. That reverses gradually, and the last years are almost entirely principal.

That structure is why prepayment early is so much more effective than prepayment late. A lump sum in year two removes principal that would have accrued interest for eighteen more years; the same amount in year eighteen saves two years of interest on a small balance. If you can prepay, prepay early.

Change the term and watch what happens. Extending a loan reduces the monthly figure and increases the total substantially, because interest accrues for longer on a balance that reduces more slowly. A cheaper month is not a cheaper loan, and the total interest figure is where that becomes visible.

Compare offers on the effective annual rate rather than the headline, since processing fees and insurance requirements change the real cost.

How to use it

1Enter the loan amount, the annual interest rate and the term in years.
2Read the monthly instalment, and then the total interest, which is the figure worth reacting to.
3Try a shorter term to see how much a higher monthly payment saves overall.
4Compare lenders on total cost including fees, not on the advertised rate alone.

Questions

Why is so much of my early payment going to interest?: Because interest is charged on the outstanding balance, which is at its largest at the start. The split reverses over the life of the loan, and by the final years almost the whole instalment is reducing principal.
Does prepaying early really help that much?: Yes, disproportionately. Principal removed in year two would otherwise have accrued interest for the remaining eighteen years. The same amount paid in year eighteen saves interest on a small balance for two.
Should I choose a longer term for a lower payment?: Only if the monthly figure is genuinely unaffordable otherwise. A longer term costs considerably more in total, because a slower-reducing balance accrues interest for longer. The total interest figure shows the trade plainly.
Is this exactly what my bank will charge?: It is the standard amortisation calculation, so the instalment should match closely. Processing fees, insurance and any difference in how the bank rounds or compounds will move the real figure slightly.