I grew up hearing the word "Euribor" at home the way you hear people talk about the weather: "Euribor went up," "thank god Euribor came down," with that same mix of resignation and relief depending on which way it went. For years I had no idea what it actually was — I just knew it affected my parents' monthly payment. When I finally sat down and looked into it properly, it turned out to be a lot simpler than it sounded in those dinner-table conversations.
Euribor, no fluff
Euribor (Euro Interbank Offered Rate) is the interest rate at which European banks lend each other money. It's not something your bank makes up, and it's not decided at your local branch — it's an index calculated daily based on what a panel of large eurozone banks say they'd be willing to charge each other.
The one that actually matters if you have, or are about to get, a variable-rate mortgage in Spain is the 12-month Euribor, the reference almost every Spanish bank uses to work out your payment.
Why it hits you directly
If you have a variable-rate mortgage, your payment isn't based on one fixed number you agreed to at signing. It works like this:
Your interest rate = Euribor + spread
The spread is the margin your bank adds (say, Euribor + 0.80%), and that part is fixed — agreed at signing, never changes. But Euribor itself gets reviewed, usually every 6 or 12 months depending on your contract, and that's where your payment can go up or down without you doing anything at all.
If Euribor climbs a full point and your mortgage is €200,000 over 25 years, that's not pocket change — we're talking dozens of euros more a month, and thousands over the life of the loan.
Why it goes up and down (spoiler: not random)
Euribor closely tracks the interest rates set by the European Central Bank (ECB). When the ECB raises rates (usually to fight inflation), Euribor follows upward. When it cuts rates, Euribor tends to drop too.
For several years, roughly 2016 to 2022, Euribor sat in negative territory. Yes, negative — it literally subtracted from your payment. It was a genuinely weird period where having a variable mortgage felt like a party. Then rates went up to tame post-pandemic inflation, and Euribor shot up fast, catching a lot of people with a payment completely out of step with what they'd budgeted for.
Bottom line: Euribor doesn't move for no reason. It tracks ECB monetary policy, and that policy responds to inflation, economic growth, and ultimately human decisions you can follow but never control.
Variable, fixed or mixed: where Euribor fits in each
- Variable-rate mortgage: Euribor hits you directly, at every review.
- Fixed-rate mortgage: Euribor doesn't touch you directly — your payment stays the same no matter what rates do. In exchange, you usually pay a somewhat higher starting rate, as a kind of insurance against future hikes.
- Mixed-rate mortgage: fixed for a few years, then switches to variable — and that's when Euribor enters the picture.
There's no objectively "better" option. It comes down to how much uncertainty you're willing to accept in exchange for potentially paying less.
What I'd actually look at if I were getting a mortgage right now
With Euribor at high levels, a fixed rate buys more peace of mind, even if the starting rate is higher. With Euribor near zero or negative, variable usually works out cheaper short-term, though you always carry the risk of it climbing later.
There's no crystal ball here. But there is one honest question worth asking yourself: if Euribor jumps 2 points over the next few years, does your budget still hold up? If the answer is "no, I'd be in trouble," that tells you something real, regardless of what any forecast says.
How I actually use it to compare offers
Before signing anything, check the current 12-month Euribor value (Spain's central bank publishes it monthly) and run your payment both at today's rate and a couple of points higher, just to see the worst reasonable scenario.
The mortgage calculator lets you plug in different interest rates and instantly see how your monthly payment and total cost change, and the mortgage comparison calculator lets you compare several fixed and variable offers side by side before you commit to one.