Changing a mortgage: compare the term before celebrating a lower monthly payment
Novation and changing lenders offer different routes to renegotiation in Spanish banking guidance. An example shows why recovering an initial cost does not settle the whole comparison.
An offer that reduces the monthly payment does not by itself explain the cost of changing a mortgage. The Bank of Spain distinguishes novation, which changes terms with the same institution, from subrogation to another lending institution. Its explanation of 17 November 2022 also warns that a lower rate with a longer term may ultimately mean paying more interest over the whole contract.
To compare proposals, start with the same question. How much principal remains outstanding, and over how many months will it be repaid under each option? If an offer extends the term, a lower payment no longer describes exactly the same payment commitment. Then add the initial costs, the fees that actually apply to the contract and the tied or bundled products listed in the documentation.
Here is a calculation of our own with deliberately limited scope. Suppose a change costs 600 euros and reduces the monthly payment by 25 euros, with that difference remaining constant. Dividing 600 by 25 gives 24 months. That break-even point compares only that outlay with that difference in payments: it does not demonstrate an overall saving on interest and includes neither insurance, rate changes, differences in term nor other costs. It is not a bank offer.
A comparison sheet can keep one row per proposal, with columns for debt, remaining term, payment, initial cost and additional conditions. Leave a field unresolved when a figure is missing; replacing it with zero would make an incomplete option seem cheaper. The 2022 source is used here for the general distinctions, not to announce fees, incentives or legal deadlines applying in 2026. A decision requires examining the actual documentation for both alternatives, including if you decide to keep the current loan.