Fixed, Variable or Mixed Mortgage

Understand how each mortgage type works in Spain, how the Euribor drives your monthly payment, which borrower profile fits each option and what to consider before signing.

How interest rates are determined

Every mortgage in Spain uses the French amortisation system (annuity method) to calculate monthly payments: each instalment covers part of the outstanding principal plus interest on the remaining balance. The key difference between a fixed, variable or mixed mortgage is not the formula itself but how the interest rate applied to the outstanding capital is set.

In a fixed-rate loan the bank and borrower agree on a single nominal interest rate (TIN) at signing. In a variable-rate loan the rate is recalculated periodically — typically every six or twelve months — using a reference index plus a spread. In a mixed mortgage a fixed rate applies for an initial period, after which the loan switches to a variable formula. Each structure distributes the risk of interest-rate movements differently between lender and borrower.

Spanish law (Ley 5/2019, known as the Ley de Contratos de Crédito Inmobiliario) regulates how banks can set and revise mortgage rates, caps early-repayment fees and requires lenders to provide a standardised information sheet (FEIN) that lets you compare offers on equal terms.

Fixed-rate mortgages

With a fixed-rate mortgage the TIN is locked in at the moment you sign and never changes throughout the life of the loan. Your monthly payment stays the same from the first instalment to the last (as long as you do not make early repayments that reduce the outstanding principal).

Advantages

• Total predictability: you know your exact monthly cost for the entire term, whether it is 20 or 30 years.
• Protection from rate rises: if the Euribor climbs sharply you will not feel it in your wallet.
• Easier long-term budgeting: ideal when planning for retirement, children or career changes, because you can forecast housing costs with certainty.
• Peace of mind: no need to track ECB meetings or Euribor publications; your payment is set.

Disadvantages

• Higher starting rate: the bank charges a premium to absorb the risk that market rates may rise during the loan, so the initial TIN is higher than a comparable variable offer.
• No benefit from falling rates: if the Euribor drops significantly, variable-rate borrowers will see their payment shrink while yours stays unchanged.
• Higher early-repayment fees: Spanish law allows banks to charge up to 2 % of the repaid amount during the first ten years and up to 1.5 % afterwards, compared with lower caps on variable mortgages.

Variable-rate mortgages

The interest rate is reviewed at regular intervals (usually every 6 or 12 months) using the formula: Euribor + spread. The spread (or differential) is fixed for the entire loan — for instance 0.75 % — but the Euribor fluctuates according to the monetary policy of the European Central Bank and interbank market conditions.

At each review date the lender takes the Euribor value published on the agreed reference date (typically the monthly average from two months prior) and adds the contractual spread. The resulting rate then applies until the next review.

Advantages

• Lower initial rate: in most market conditions the starting TIN is noticeably below what a fixed-rate product would offer.
• You benefit when rates fall: any drop in the Euribor is passed through to your payment at the next review.
• Lower early-repayment fees: capped by law at 0.15 % (if reviewed every 12 months) or 0.25 % (if reviewed every 6 months) of the amount repaid early.
• Often fewer tied products: some banks require fewer cross-selling commitments (insurance, payroll domiciliation) to unlock a competitive spread.

Disadvantages

• Payment uncertainty: your monthly instalment can rise substantially if the Euribor increases, as we saw between 2022 and 2024.
• Harder to plan ahead: not knowing future payments makes it difficult to commit to other long-term financial goals.
• Risk of financial stress: if you take out the mortgage when the Euribor is unusually low and your budget is tight, a sudden rate rise could strain your finances.

Mixed / hybrid mortgages

A mixed mortgage combines a first tranche at a fixed rate (commonly the first 5, 10 or 15 years) with a second tranche at a variable rate (Euribor + spread). It is a middle-ground product designed for borrowers who want stability during the early years — when the payment-to-income ratio is usually tightest — but are willing to accept market exposure in the second half of the loan.

The fixed-rate portion typically carries a TIN somewhere between a pure fixed offer and a pure variable offer. Once the fixed period ends, the spread for the variable tranche is agreed at signing, so you know from day one exactly what formula will apply later.

When a mixed mortgage makes sense

• You expect to repay a significant portion of the principal during the fixed tranche (through planned savings, an inheritance or the sale of another property), reducing your exposure when the variable period begins.
• You want maximum predictability during the early years, when the payment weighs most heavily on your income, and you are comfortable betting on a moderate Euribor in the future.
• You plan to sell the property or cancel the mortgage before the fixed tranche expires, effectively turning it into a fixed-rate loan in practice.
• You are looking for a compromise between the security of a fixed rate and the lower cost of a variable rate, without committing fully to either.

Quick comparison table

How the Euribor affects a variable-rate mortgage

The Euribor (Euro Interbank Offered Rate) is the rate at which major European banks lend money to one another. The variant most commonly used in Spanish mortgages is the 12-month Euribor. When a review date arrives, the bank takes the published value for the agreed reference month and adds the contractual spread. The resulting figure becomes the new nominal rate until the next review.

Because the Euribor tracks the ECB’s key interest rates and overall money-market conditions, it can move significantly over the life of a 25- or 30-year mortgage. During 2021 the 12-month Euribor sat below 0 %, yet by late 2023 it had climbed above 4 %. Those swings translate directly into higher or lower monthly payments for variable-rate borrowers.

A useful rule of thumb: simulate your payment at the current Euribor, then add two percentage points and check whether you could still comfortably afford the result. If the answer is no, a variable rate may not be the right choice for your situation.

How to decide based on your profile

There is no universally “best” mortgage type. The right choice depends on your income stability, risk tolerance, time horizon and current market conditions. Below are some general guidelines.

Choose a fixed-rate mortgage if…

• Your income is stable but leaves little room for payment increases.
• You value peace of mind over the possibility of saving a few euros per month.
• Your loan term is long (25–30 years) and you want no surprises along the way.
• Current fixed rates are historically low, locking in a good deal for decades.
• You are risk-averse by nature and losing sleep over rate movements is not for you.

Choose a variable-rate mortgage if…

• You have a wide margin in your budget: even if the payment doubled, your finances would not be at risk.
• You plan to repay aggressively or cancel the mortgage within a few years, limiting your exposure to rate swings.
• You believe rates will stay moderate in the medium term and you are comfortable accepting the risk if they do not.
• You want to keep early-repayment fees as low as possible because you intend to make partial overpayments regularly.

Choose a mixed mortgage if…

• You want stability during the first 5–15 years and flexibility afterwards.
• You expect to move or sell the property before the variable tranche kicks in.
• You are looking for a balance and do not want to pay the full premium of a pure fixed-rate product.
• You anticipate extra income later (career progression, partner returning to work) that would cushion any payment increase.