When an instalment comes back higher than you hoped, the easiest fix offered is a longer tenure. It works — the monthly figure drops immediately. What is rarely spelled out is what you pay for that relief.
Why the instalment falls
The same principal is spread across more months, so each month carries less of it. But interest is charged on the outstanding balance for as long as the balance exists. Stretch the term and the balance stays high for longer, so interest keeps accruing on it.
The instalment falls quickly at first as you extend, then flattens. Going from ten to twenty years changes the monthly figure a great deal. Going from twenty-five to thirty changes it comparatively little, while adding five more years of interest.
When a longer tenure is the right choice
- The shorter-term instalment would leave no room for ordinary emergencies
- Your income is likely to rise and you intend to prepay later
- You are early in your career and buying sooner has its own value
- A shorter term would push your obligations past what a lender will accept
When it is worth resisting
- You can comfortably afford the shorter term and are extending out of habit
- The loan would run well past your expected retirement
- You are extending only to qualify for a larger amount than you need
The middle path
Many borrowers take a longer tenure for the safety margin and then prepay when they can — a bonus, a maturing investment. Because prepayments come off the principal, they reduce future interest disproportionately. Ask the lender how prepayment is treated, whether there are charges, and whether it shortens the tenure or reduces the instalment. The answers differ, and they matter.