Fixed or variable mortgage in Spain 2026: what matters for investors

The "fixed or variable mortgage" question has been generating articles with inconclusive answers for years. And the reason is simple: most of those articles are written for first-time buyers, not for investors. For someone buying a home to live in, the monthly payment is an expense. For someone buying to let, renovate or resell, the payment is one item within a financial model. And that changes everything.

In 2026, with Euribor rising again (3.239% in October, 1.052 points higher than a year earlier, according to the Banco de España, Spain's central bank), the debate is relevant again. Fixed rates have also risen (from 2.49% to 2.71% on average for new mortgages fixed for more than 10 years, between September 2025 and September 2026, according to the Banco de España), variable rates are no longer as cheap as they seem and mixed mortgages have gained ground. Here is the analysis from the perspective of someone buying to invest.

Why 2026 forces you to rethink the calculation

During the years of zero rates (2015-2021) the choice was easy: variable won almost every time because Euribor was negative or around zero. Paying a 0.8% margin was cheaper than signing up to a 2.5% fixed rate. The problem is that many investors signed variable mortgages in those years without thinking that Euribor could reach 4.16%, as happened in 2023.

The 2026 scenario is different. The ECB has raised rates again in 2026 (in June and in September), Euribor has risen by more than a point in a year and is at levels that would have been considered normal before 2016. A Euribor above 3% is not historically low. It means the difference between a fixed and a variable mortgage is no longer as dramatic as in the golden years of negative rates, and the risk of a variable rate is still real.

The fixed-rate mortgage through an investor's eyes

A fixed-rate mortgage has one advantage for investors that nobody disputes: predictable cash flow. You know exactly what you'll pay for 20 or 25 years. That lets you calculate the net margin on the deal precisely, compare opportunities and project the yield without uncertain variables in the denominator.

In 2026, fixed rates for second homes or investment range between 3.2% and 4.5% depending on the lender and the applicant's profile. An investor with a good credit history, assets on the balance sheet and a property with a solid valuation can aim for the low end of that band. Someone buying their first investment with a 20% deposit will see offers closer to 4%.

The disadvantage is rigidity. If Euribor falls to 1% in 2028, whoever has a fixed rate keeps paying what was agreed. And if they want to repay early, the fee is 2% during the first 10 years (on the outstanding capital), or 1.5% after that period, under Ley 5/2019 (Spain's mortgage credit law). For an investor planning to hold the property long-term, this is perfectly manageable. For one thinking of selling in 3 years, it can be a significant cost.

The variable-rate mortgage: what you really need to understand

A variable rate is referenced to 12-month Euribor plus a fixed margin (diferencial) that the bank doesn't change during the life of the loan. In 2026 competitive margins are between 0.50% and 0.90%. With Euribor at 3.239% (October 2026), the effective rate with those margins comes out at between 3.7% and 4.1%. Not very different from fixed, at least at the moment.

The review is annual in almost all contracts. That means that if Euribor rises by 100 basis points next year, your payment goes up at the next review. If it falls, it also adjusts downwards. Euribor's volatility in 2022-2024 showed that this risk is entirely real: in 18 months the index went from negative to 4%. A €200,000 variable mortgage saw its monthly payment rise by more than €400 over that period.

A variable rate makes sense today for investors with enough liquidity to withstand payment increases without the deal going into the red, and for those with a short divestment horizon that lets them sell before the cycle turns against them.

The mixed mortgage: why it's gaining so much ground

A mixed mortgage combines an initial fixed-rate period (usually 3, 5 or 10 years) followed by a variable period referenced to Euribor. It's the product that has grown most in Spanish banks' product range over the last two years, and there's a clear reason: it fits very well with many investors' strategy.

Rates for the fixed period of a mixed mortgage are usually between 0.5 and 0.8 points lower than a pure fixed rate. In 2026 it's common to see mixed mortgages with initial fixed rates of between 2.8% and 3.4% for 5 years. For someone who buys, renovates and resells within that time frame, a mixed mortgage offers the predictability they need during the investment at a lower cost than a fixed rate.

The risk lies in ending up in the variable period without having planned for it. Someone who signs a mixed mortgage intending to sell in 5 years and in the end doesn't sell moves into the variable period in the middle of a cycle of uncertainty. It isn't necessarily a bad outcome, but it has to be in the equation from the start.

Which type fits which strategy

There is no universal best type. There is the type that fits the specific plan for the investment. These are the combinations that make most sense:

• Long-term buy to let (more than 10 years): Fixed is the most rational option. Predictable cash flow protects the net rental margin against any interest-rate cycle. Someone with 3 flats let out can't afford for their payments to rise by €500/month if the ECB decides to raise rates.
• House flipping (buy, renovate, sell within 12-24 months): Variable or a short mixed mortgage. The horizon is so short that the risk of Euribor rises is low, and you pay less at the outset. What matters here is the early repayment fee: it should be minimal.
• Bank repossessions or auction properties with a view to letting: Fixed or mixed. You already have the profit in the purchase price; you don't also need to optimise on financing by taking on extra risk.
• A 5-7-year investment, with a possible sale at the end: A 5-year mixed mortgage. Full protection during the investment, and an exit assessment when you reach the variable period.
• A large portfolio (several properties): Diversify. Combining fixed and variable rates lets you average out the risk and take advantage of different points in the cycle.

The mortgage mistake 80% of investors make

Choosing the type before being clear about the plan. It's the most common mistake and also the most expensive. The mortgage is the consequence of the investment strategy, not the precondition. First you define what you're going to do with the property, for how long and what cash flow you need for the deal to be profitable. Then you look for the product that fits.

A concrete example: an investor who buys a bank repossession for €120,000 (market valuation: €165,000) intending to let it for 15 years shouldn't be optimising over paying €20 a month more or less by choosing a variable rate. They should be optimising for predictable net cash flow over 15 years. Sign the fixed rate, let the property and forget about the mortgage rate for years.

What the banks don't tell you about the TAE

The TAE (Tasa Anual Equivalente, the Spanish equivalent of the APR) is the right metric for comparing mortgages, but it has pitfalls that investors should know about. The TAE includes arrangement fees, linked insurance and costs that form part of the total cost of the loan. That's fine. The problem is that it makes assumptions about the life of the loan that are rarely met with active investors.

If you plan to pay off the mortgage in 7 years but the TAE is calculated over 25 years, the comparison distorts reality. In addition, the life and home insurance that the bank includes in the TAE isn't always compulsory (the law prohibits making it a condition of the loan), although it is usually linked to a discount on the margin. Taking out that insurance outside the bank and losing a 0.25% discount can pay off if the external cost is sufficiently lower.

What you must negotiate in 2026

The interest rate is only one part of the mortgage negotiation. These are the points where there is most real room for manoeuvre:

• The margin: On variable mortgages, a broker with good banking relationships can get 0.2-0.4 points below the public offer. On a €200,000 mortgage over 25 years, that's more than €20,000 in interest.
• Early repayment fee: Critical for any investor who expects to sell or reinvest. The law caps the fees, but within that limit there is room for negotiation.
• Initial grace period (carencia): Paying interest only for the first 6-12 months can be decisive if the property needs renovating before it generates rent. Some banks grant it at no cost if the credit profile is good.
• Insurance: The bank can't force you to take out its insurance as a condition for granting the mortgage (Ley 5/2019 says so). It can, however, link it to a rate discount. Assess whether that discount makes up for the extra cost of the bank's own insurance.

Is it worth using a mortgage broker for investments?

For most active investors, the answer is yes. A well-connected broker works with multiple lenders, knows terms that aren't in the public shop window and only charges if they close the deal (often with a commission paid by the bank, not the buyer). The potential saving on margins and linked products usually far exceeds any fee involved.

Where it makes less sense is for investors buying exactly one property in an area where they already have an established relationship with their local bank. In that case, the existing relationship may be worth more than what a generic intermediary brings.

A real simulation: fixed vs variable for a typical bank repossession

A bank repossession bought for €130,000 with 70% financing (€91,000) over a 20-year term. 2026 scenario:

• Fixed-rate mortgage at 3.6%: Monthly payment ~€536. Total cost in interest: ~€37,700. Absolute predictability.
• Variable-rate mortgage, Euribor 3.239% + 0.7%: Initial rate ~3.9%. Initial payment ~€549. If Euribor rises to 3.5% in 2028 → the payment goes up to ~€560. If it falls to 1.5% → the payment drops to ~€462.
• Mixed mortgage (fixed for 5 years at 3.0%, then Euribor + 0.8%): Initial payment ~€505. Fixed period: maximum certainty. From year 6: it depends on Euribor at that point.

For an investor with rent of €800/month on that property, any of the three options generates positive cash flow. The difference lies in how much risk of variation they want to take on and in how nimbly they can adjust if the scenario changes.

Related resources: If you're considering financing the purchase of a bank asset or an auction property, start with the inventory of bank repossessions and court auctions. To work out whether the deal stacks up with the mortgage payment you're being offered, read our guide on how to calculate the yield on a flat and the analysis of 100% financing on bank repossessions.