Why the total cost surprises people
The monthly figure is the one everybody focuses on, because it is the one that has to fit a budget. It is also the one that hides the size of the commitment. A loan of fifty lakh at 8.75 percent over twenty years costs roughly fifty-six lakh in interest — more than the amount borrowed — and nothing about a comfortable monthly EMI communicates that.
The mechanism is compounding over a long term. Interest accrues on the outstanding balance every month, and because early instalments barely reduce that balance, the interest keeps accruing on nearly the full amount for years.
This is why the year-by-year breakdown on this page is worth reading before signing anything. Seeing that the first year's payments went almost entirely to interest changes how people think about the tenure they choose, and it is much better to discover it now than in year three.
Tenure, and the trade nobody explains at the counter
Extending the tenure lowers the EMI, which is how loans get sold. It also raises the total cost substantially, and the second effect is rarely presented alongside the first.
Run the comparison yourself: take your loan amount and rate, and look at the total payable at fifteen, twenty and twenty-five years. The monthly difference between fifteen and twenty-five years is often modest; the difference in total interest usually runs to many lakhs. Whether that is worth it depends on what else you would do with the monthly difference, but it should be a decision rather than a default.
The general principle is to borrow over the shortest term whose EMI you can comfortably sustain — with emphasis on comfortably. A shorter tenure that leaves no margin turns any interruption in income into a missed payment, and the cost of that exceeds the interest you saved.
Prepayment, and when it is worth making
Prepayment is most powerful early, for the same reason total interest is so high: in the early years the outstanding balance is large, so removing principal prevents interest that would otherwise accrue for the whole remaining term. The same lump sum applied in year fifteen saves a small fraction of what it would have saved in year two.
To model it here, reduce the loan amount by the prepayment and compare the total interest with your original figure. If your lender reduces the tenure rather than the EMI when you prepay — which is usually the better option — shorten the tenure instead and compare that way.
Check the penalty position before committing. Under RBI rules, floating-rate home loans to individuals cannot carry a prepayment charge, but fixed-rate loans and many personal and business loans can, and a penalty can erase the benefit of prepaying a loan that is already well progressed.
Working out what you can actually afford
Start from your budget rather than from the amount you want. Decide the monthly figure you can sustain without relying on overtime, bonuses or a second income, then use this calculator in reverse: adjust the loan amount until the EMI matches that figure.
The commonly cited guidance is that all EMIs together should stay under about forty percent of take-home pay, and a home loan alone under thirty. Lenders will frequently approve more, because their assessment is of your ability to repay rather than of your quality of life while doing so.
Leave room for the costs that come with the asset rather than the loan. A home brings maintenance, property tax and insurance; a car brings insurance, servicing and fuel. Budgeting to the EMI alone is how people end up technically able to make the payment and unable to afford anything else.