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Every lender leads with the monthly payment, because it is the number that sounds manageable. The number that decides whether a loan is a good idea is the total interest, and it is rarely the one on the poster. The two move in opposite directions with the tenure: stretching a loan over more years lowers the monthly payment and raises the total cost, often by a great deal.

That trade-off is the single most useful thing to see laid out. The same amount at the same rate over five years versus fifteen produces a comfortable monthly figure in one case and, over the full term, a total repayment that can approach twice the sum borrowed. Neither is automatically wrong — a lower payment can be the right call for cash flow — but it should be a decision rather than a surprise.

The rate matters more on longer loans than short ones, so a fraction of a percentage point is worth negotiating on a mortgage and barely worth the phone call on a two-year personal loan. Change one field at a time and watch which output moves. This is a standard amortisation calculation and does not include processing fees, insurance or prepayment charges, which vary by lender and can shift the real cost.