Fixed, variable or mixed-rate mortgage: which to choose
Banks want you to decide fast. You want to decide right. Those are different things. Here is what hundreds of real buyers have figured out about each format — no sales pitch attached.
How each type works
Fixed rate: you pay the same interest rate for the entire life of the loan. Your monthly payment never changes regardless of what the euribor does. The tradeoff is a higher starting rate than the other options, and banks apply early repayment fees (typically 0.5–2% in the first years, though this is negotiable).
Variable rate: the interest is recalculated every 6 or 12 months based on the euribor. If the euribor falls, you pay less; if it rises, you pay more. The typical spread banks offer ranges from euribor + 0.40% to euribor + 1.60%, depending on your profile and how many products you buy from them.
Mixed rate: combines both. An initial fixed-rate period (typically 5, 7 or 10 years, with some banks offering up to 15) followed by a variable tranche referenced to the euribor. By law, early repayment during the variable tranche carries no penalty — a flexibility banks are not eager to advertise.
What people who have already signed say
The consensus in Spanish mortgage communities is consistent: a well-used mixed mortgage tends to win on total interest paid, but it requires an active strategy.
The logic: Spanish mortgages use the French amortisation system, which means the early years carry the heaviest interest burden in absolute terms. If during those years you have a low fixed rate (say, 1.5–2%), the saving compared to a fixed mortgage at 3% is substantial. Once the fixed tranche ends, if market conditions allow, you subrógate to another mixed or fixed mortgage — potentially at a similar rate to what you would have signed today.
One user with a €200,000 mortgage explained it this way: if you manage to subrógate to under 2.8% when a 10-year fixed tranche at 1.5% ends, the mixed mortgage will have cost you less than a fixed mortgage at 2.1% from the start. If the rate you get then is worse, the original fixed mortgage would have won.
When each option makes more sense
Fixed rate makes sense if you prioritise predictability over potential savings, if the loan amount is small (below roughly €120,000–150,000, where the saving from a mixed mortgage does not justify the complexity), or if you have no appetite for monitoring and subrógating.
Variable rate is hard to defend when rates are elevated. Users who signed variable-rate mortgages before 2022 saw their payments surge when the euribor hit 4%. Today it makes sense mainly for short terms or when the spread is very low.
Mixed rate works best for larger loan amounts and borrowers with strong profiles, who can capture the savings in the early years and have the means to act before the variable tranche starts. For smaller mortgages or people who prefer not to be actively managing their loan, a fixed rate is simpler.
What to check in a mixed mortgage, according to the forums
- The initial fixed rate: there is not always much difference between a 5-year and a 10-year fixed tranche if the rate is similar, but banks do adjust the rate by tranche length, so ask for an explicit comparison.
- The spread on the variable tranche: some banks lure you with an attractive initial fixed rate but hide a euribor + 1.5% from year six onward. That is a deliberate trap. Euribor + 0.40–0.70% is reasonable; above + 1% is worth negotiating.
- Early repayment fees: during the variable tranche, the law guarantees free cancellation. During the initial fixed tranche, however, a fee may apply. Negotiate to have it removed.
- The length of the fixed tranche: a 5-year fixed period gives limited protection — if the euribor is high in year six, you absorb it immediately. Ten years gives much more room to manoeuvre.
What the banks' own behaviour signals
Banks steer borrowers away from mixed mortgages when it suits them. During periods of high rates, some banks — CaixaBank being a frequently cited example — offered nearly identical conditions for fixed and mixed products, effectively discouraging the mixed option. That pattern is revealing: when the bank does not want you to take the mixed mortgage, it is probably the one that works in your favour.
Banks are not neutral advisors. They are counterparties with their own incentives. If a product gives them less margin, they make it less visible.
Practical takeaway
There is no universal answer, but a useful rule of thumb appears repeatedly in the forums: if the mixed mortgage has a good initial fixed rate and you can subrógate before the variable tranche begins, it is the most cost-effective option in most cases. If you do not want to manage that process, or if your mortgage is small, a fixed rate at a reasonable level is the cleaner choice. A pure variable rate has little justification today except for very short terms.