Fixed or Variable Mortgage in 2026? Read the Curve First

Fixed or variable mortgage in 2026? Lock in fixed when the forward Euribor curve is sloping upward — and right now, sharply, it is. The 1-month Euribor sits at 2.00%, the 12-month at 2.76% (Euribor-rates.eu, 27 April 2026) — a 76-basis-point premium that says markets expect rates higher in a year, not lower. After the March Middle East war pushed Brent past $100, eurozone forward markets have priced in roughly two 25 bp ECB hikes by year-end (ECB account, 18-19 March 2026). That shifts the math.

The short version:

• Forward curve, not spot rate. The 1M-vs-12M Euribor spread (2.00% → 2.76%) is the market's published forecast. Compare against that, not today's headline number.
• Country structure matters more than personal preference. Variable barely exists in Germany, is rare and capped in France, dominates in Spain/Portugal/Netherlands, and in the UK there's no true variable — just a "standard variable rate" trap at 7.15%.
• The starting gap is bigger than you think. On a €250,000 25-year mortgage at typical Spanish rates, fixed already starts ~€100/month cheaper than variable today.
• Mixed/hybrid is the real third option. Fixed for 5–10 years, then variable. It's the fastest-growing new product in Portugal in 2026.
• Plan the post-fix moment now. UK borrowers rolling off a sub-2% deal onto a 7.15% SVR is the textbook reason this decision has a part two five years from now.

What just changed: the curve flipped

For most of the past two years, the Euribor forward curve was flat or sloping downward — markets expected lower rates ahead, and fixed offers reflected it. As of late April 2026 the slope has reversed. The 1-month Euribor exactly tracks the ECB deposit rate at 2.00%; the 3-month is 2.17%, the 6-month 2.47%, and the 12-month 2.76% (Euribor-rates.eu, 27 April 2026).

That 76 bp slope from short to long is not a fee for the bank's trouble. It is the consensus prediction that the ECB will tighten before the end of 2026. The trigger was the Middle East conflict that erupted in March, pushing Brent past $100 and inflation back above target — UK CPI jumped from 3.0% in February to 3.3% in March alone. The ECB Governing Council, meeting 18-19 March, held all three policy rates and explicitly preserved "agility to respond as the inflation outlook evolved" (ECB account).

The practical consequence: a variable-rate borrower who in February faced a likely flat-or-falling Euribor for the year now faces a likely rising one. That alone is enough to flip a marginal "go variable" call into "lock fixed."

How fixed vs variable actually works in your country

Mortgage product mixes are not symmetrical across the eurozone. Structural reality matters more than personal preference because you can only buy what banks actually sell:

Two things stand out. First, Germany and France are mostly fixed-only markets — the question barely exists there because variable retail products are scarce or rate-capped to the point of irrelevance. Second, the Netherlands introduced energy-label-based pricing on 1 April 2026: identical products carry different rates for an A-label home vs an E-label home, with a sustainability discount preserved only for offers issued before that date (Hypotheekrente.nl). That changes the comparison and rewards buyers in newer or already-renovated stock.

A note on Spain specifically: INE's last published average mortgage rate for new loans was 2.87% (December 2025), but that figure mixes legacy and new contracts. New fixed deals from 2.10% TIN are available because Spanish banks are leaning hard on fixed to defend market share against the post-2022 mortgage-volume slump.

Will mortgage rates fall in 2026?

Probably not — and the published market consensus says they're more likely to rise. Eurozone forward markets are pricing in approximately two 25 bp ECB hikes by December 2026, conditional on Middle East tensions sustaining oil above $90 per barrel. A Reuters poll of economists in early 2026 found a near-three-quarters majority expects no cut before year-end. The UK 2-year fix moved from 4.84% on 6 March to 5.82% on 23 April — a 98 bp jump in seven weeks driven entirely by repriced rate expectations.

That doesn't mean rates will rise. It means the bet that they will is currently the cheaper bet for a bank to underwrite. If you take a variable rate today, you are taking the opposite side of that bet — and you need a better reason than "I think the market is wrong."

The break-even, in plain numbers

Take a typical Spanish case: €250,000 borrowed over 25 years.

• Fixed at 2.85% (INE average for new mortgages, December 2025): monthly payment €1,167, lifetime interest €100,000.
• Variable at Euribor 12m + 0.85% = 3.61% today: monthly payment €1,266 at today's rate, lifetime interest €130,000 if rates stay flat.

Variable starts €100/month more expensive and pays €30,000 more in interest if Euribor doesn't move. For variable to come out ahead, Euribor 12m must fall and stay materially below 1.50% for most of the loan's life — a level last seen sustainably in the negative-rate era of 2015-2021.

Markets are pricing the opposite of that bet through end-2026. The variable case requires you to be confidently more dovish than the entire eurozone bond market for the next quarter-century. If you want to verify the math against your actual offer with proper rate-period modeling, track the comparison line by line in CasaTab — most online calculators don't handle rate-period transitions, which is the whole point of the exercise.

The third option: mixed (hybrid)

The fastest-growing mortgage product in Portugal in 2026 isn't fixed or variable — it's mixed: a fixed-rate period (typically 5, 7 or 10 years) followed by Euribor-indexed variable for the remainder. Portuguese bank Santander explicitly markets it as the "intermediate solution" (Santander Salto). Spanish lenders have been running mixed deals from 1.30% on the fixed leg.

The appeal: the fixed period covers the volatile near-term, while the variable tail captures any structural rate decline over 15+ years. The cost: you pay a small premium (typically 10–30 bp) for the optionality, and you face a refixing decision when the fixed period ends.

In April 2026, with the curve sloping up, mixed is mathematically attractive only if you believe the rate spike is short-lived — i.e., that 5-year fixed protection is enough to ride it out. If you believe the new regime is structural, full-term fixed is cleaner.

What happens when my fixed rate ends?

Your bank moves you onto its standard variable rate (or local equivalent) at the rate prevailing on that date — which is almost always materially worse than the fixed deal you came off. In the UK, the average SVR is 7.15% against a 5-year fix of 5.72% — a 143 bp jump for doing nothing. In Spain and Portugal, the post-fix variable defaults to Euribor + your contracted spread, which on older loans was negotiated when Euribor was still negative.

The mistake is treating the post-fix moment as a future problem. The right move:

1. Diary the fix-end date the moment you sign. Calendar it 6 months out, not 6 weeks — refixing offers move faster than re-mortgaging to a new lender.
2. Track the prevailing market rate now so you have a multi-year baseline. Without history you can't tell whether the renewal offer is good.
3. Plan the refinance, not the renewal. In the eurozone, switching lender (subrogación, rachat, Umschuldung) is often cheaper than your current bank's renewal offer.

This is also where the overpay-vs-invest decision becomes acute: a one-off chunk-down at the refix moment shrinks the principal that gets repriced and locks in years of savings.

A three-question decision framework

Skip the "are you the cautious type?" personality quizzes. Three questions:

1. What is the spread between today's fixed offer and (today's variable + 50 bp)? If fixed is cheaper or within 20 bp, take fixed — the market is telling you variable will reach that level anyway.
2. Can you absorb a 100 bp variable jump in the monthly payment without changing your life? If no, take fixed regardless.
3. What does your country actually offer? In Germany and France the question is mostly which fixed term, not whether to fix. In Spain, Portugal, and the Netherlands, it's a real choice — and mixed deserves a serious look.

The decision is arithmetic plus structure. The "personality" framing is what mortgage brokers use to close.

The piece nobody plans for: tracking it across rate periods

Whether you fix, go variable, or pick mixed, the mortgage you sign today is not a single rate — it's a sequence of rate periods, possible extra repayments, and at least one refix decision over the loan's life. Spreadsheets handle the first year. By year three, most are abandoned.

CasaTab's mortgage tracking is built for exactly this: rate periods with effective dates, extra repayments that recompute the schedule, and a running view of cumulative interest paid versus principal remaining. It's also the place to hold the mortgage decision next to the full cost of buying the house — the down payment, notary, taxes and fees that determined how much you needed to borrow in the first place.

The honest conclusion

In April 2026, the conventional advice — "go variable, the ECB will keep cutting" — is six months out of date. The curve has turned, the war has changed the calculus, and fixed offers across the eurozone are competitive enough to reward locking in. That doesn't mean fixed wins forever. It means the market currently agrees with the cautious choice — and when the market agrees with you, the cautious choice is no longer expensive insurance. It's the cheaper bet.

Lock in fixed if you have an offer at or below current variable + 30 bp. Take mixed if you want optionality and your country offers it natively. Pick variable only if you genuinely believe the curve is wrong — and have the cashflow to be wrong with.