Debt Refinancing: Compare Total Cost, Not Only the Payment

Monthly payment and total cost answer different questions

A longer term can reduce the monthly payment while increasing the amount repaid over the full life of the debt. Model both paths from the same starting balance and include upfront fees. If one path has a promotional period, show the rate that applies after it ends.

A payoff date must be mathematically possible

For revolving credit, a minimum payment that barely covers interest can create an extremely long or non-amortising path. A responsible calculator should refuse to invent a payoff date when the balance does not reliably fall.

Preserve the reason for refinancing

Cash-flow relief, interest saving and simplification are different objectives. State which one matters, then judge the new facility against that objective without hiding collateral, fees or term extension.

Compare the same debt over the same horizon

Place the existing facility and the proposed refinance on one timeline from the same starting balance. Include fees at the point they are charged and show both the monthly cash-flow change and the total modeled repayment. This prevents a longer term from appearing cheaper simply because the payment is spread over more months.

Identify the break-even condition

If refinancing has an upfront cost, calculate how long the interest or payment saving must continue before that cost is recovered. Then test what happens if the debt is repaid earlier than planned. A refinance that looks attractive over a long contractual term may not be attractive for someone likely to settle the balance much sooner.