Fixed or variable mortgage in 2026: which to choose

First, how Spanish mortgages differ from home

Three structural differences surprise many foreign buyers:

• Fixed means fixed for the whole term. In Spain a "hipoteca fija" locks the rate for 25 or 30 years. In the UK, a "fixed" deal typically lasts 2–5 years before reverting; in the US, 30-year fixed loans exist but refinancing culture is different. A Spanish fixed rate is a genuine lifetime lock.
• Variable mortgages track the Euribor. Not a bank's standard variable rate: the reference index is public, published monthly, and your contract defines the exact formula.
• The French amortisation system is used almost universally: a constant monthly payment where the interest share falls and the principal share grows over time.

What is the Euribor?

The Euribor (Euro Interbank Offered Rate) is the rate at which European banks lend to each other. The 12-month Euribor is the standard reference for Spanish variable mortgages. Your rate is calculated as Euribor + spread (diferencial) agreed with the bank — for example, Euribor + 0.50 %. The rate is then reviewed periodically, usually once a year: the bank takes the Euribor published for the review month and your payment is recalculated for the next 12 months.

The index moves with European Central Bank policy. In the last decade it has ranged from negative values (below −0.5 % in 2021) to above 4 % in 2023 — a swing large enough to change a typical payment by hundreds of euros per month. Any honest comparison must therefore test scenarios, not just today's value.

Fixed-rate mortgage: pay for certainty

The interest rate stays constant for the whole life of the loan. The advantage is total predictability: the payment you sign is the payment you will make in year 25, which makes household budgeting trivial and protects you completely from rate rises. The downsides: the starting rate is usually somewhat higher than the initial variable rate, and if rates fall you keep paying the agreed rate unless you renegotiate (novación) or move the loan to another bank (subrogación), both of which may carry fees.

Variable-rate mortgage: cheaper start, open risk

The rate is Euribor plus your spread, reviewed every 6 or 12 months. If the index falls, your payment falls at the next review; if it rises, so does your payment. Banks compensate the risk transfer with lower initial pricing. A variable loan tends to win when the Euribor stays low or falls over the life of the loan — and to hurt when it climbs, as borrowers who signed at near-zero rates discovered in 2022–2023.

The mixed mortgage: a middle path

Spanish banks also offer mixed (mixta) mortgages: a fixed rate for the first 5, 10 or 15 years, then Euribor + spread for the remainder. You get certainty during the years when the outstanding balance — and therefore the interest risk — is largest, and accept variability later, when the debt is smaller and your income has usually grown. In 2026 mixed products are heavily marketed and often carry the lowest initial rates, but read the variable phase conditions as carefully as the fixed phase.

Beyond the rate: what else to compare

• Linked products (bonificaciones): banks discount the rate if you take their payroll deposit, home insurance or life insurance. Price the insurance separately — a 0.30 % rate discount can cost more than it saves.
• TAE vs. TIN: compare the APR-equivalent (TAE), which includes fees and linked costs, not just the nominal rate (TIN).
• Early repayment fees: legally capped, and different for fixed and variable loans. If you plan to overpay, read our guide on whether to reduce the term or the payment.
• Non-resident conditions: buyers without Spanish tax residency are typically offered lower loan-to-value (often 60–70 % instead of 80 %) and slightly higher rates. Budget for that gap.
• Affordability rule: banks generally want the payment below roughly a third of your net household income. Check what that means for you with our guide to net salary in Spain.

How to decide: a practical checklist

• If the bad scenario (+1 or +2 points at review) would strain your budget, or you simply value peace of mind: fixed.
• If you have financial slack, expect rates to drift down, or plan to repay early (shortening the years of exposure): variable becomes more attractive.
• If you want certainty now but flexibility later: mixed.
• Whatever you choose, simulate the full amortisation schedule before signing — the total interest figure is far more revealing than the monthly payment.

Frequently asked questions

Can I switch from variable to fixed later?

Yes, by renegotiating with your bank (novación) or moving the mortgage to another bank (subrogación). Spanish law limits the fees for converting variable loans to fixed, but the new fixed rate will reflect market conditions at that moment, not today's.

Which is better if I might sell within 10 years?

A shorter horizon reduces the value of a 30-year rate lock and makes the cheaper initial pricing of variable or mixed loans more relevant. Run both scenarios over your expected holding period, not the full term.

Does the payment change immediately when the Euribor moves?

No. Your rate only updates at the contractual review date (every 6 or 12 months), using the index value defined in your deed.