Why a Longer Loan Term Can Cost You More Overall
A longer loan term lowers your monthly payment but increases total interest paid, because interest accrues every month on whatever balance is still outstanding — stretching repayment across more months means more months of accrual on a balance that's paid down more slowly, even though the interest rate itself hasn't changed.
This is one of the most common points of confusion when comparing loan offers, since a lower monthly payment intuitively feels like the better deal.
The mechanic behind the higher total cost
Interest is calculated on the remaining balance each period, not on the original principal alone. A shorter term forces larger payments that knock down the balance faster, reducing the base that future interest is calculated against — a longer term does the opposite, keeping the balance higher for longer and accruing interest against it for more total months.
When a longer term still makes sense
A longer term can still be the right choice if the lower payment meaningfully improves monthly cash flow or affordability, or if the extra cash freed up is used productively — the key is making that trade-off consciously, by checking the total interest figure alongside the monthly payment rather than looking at the payment alone.