Few indicators appear as frequently in financial news as the Euribor. When it rises, media outlets warn mortgage holders. When it falls, savers wonder what will happen to deposit rates. And behind every Euribor move, there is always the same figure: the European Central Bank. Yet the chain that runs from a decision in Frankfurt to the monthly payment you make at the start of the month is rarely explained in full. Understanding it requires no economics degree — it just requires knowing where to look and what each piece means.
What the Euribor is and why you keep seeing it in the news
The Euribor — Euro Interbank Offered Rate — is the interest rate at which major European banks lend money to each other in the interbank market. Each business day, a panel of leading institutions reports the rate at which they would be willing to lend euros to other banks, and those figures are used to calculate the index for several maturities: one week, one month, three months, six months, and twelve months.
The most closely watched in Spain is the twelve-month Euribor, because it is the reference used by most variable-rate mortgages to calculate the applicable interest rate at each review. If you have a variable mortgage reviewed annually, your bank will take the Euribor for that month, add a fixed spread agreed in the contract — say, 0.99 percentage points — and the result will be the rate you pay for the next twelve months.
The key point is that the Euribor is not set by any individual bank or any public body directly. It is a market index: it reflects what banks actually expect to pay or charge for short- and medium-term money. That is why it moves before the ECB acts formally — the market anticipates decisions.
The transmission chain: from the ECB to your mortgage
The European Central Bank’s primary mandate is to maintain price stability in the eurozone, with an inflation target of close to 2%. Its main tool for doing so is reference interest rates, of which there are three: the deposit facility rate (what banks pay to park money at the ECB overnight), the main refinancing operations rate (the price at which banks obtain ordinary funding from the ECB), and the marginal lending facility rate (the cost of emergency last-resort funding).
When the ECB raises its rates, it makes money more expensive for banks. Those banks pass that higher cost on to the interbank market, and the Euribor rises. In turn, banks pass the increase on to their customers through loan rates: mortgages, consumer credit, and business lending. The chain works in reverse too: when the ECB cuts rates, money becomes cheaper, the Euribor falls, and at the next review variable mortgages pay less.
How long it takes for the impact to reach your monthly payment depends on when your mortgage is reviewed. If it is reviewed in October and the ECB raises rates in June, you will not feel it until the following October. That explains why many mortgage holders in Spain took months to feel the rate hike of 2022 and 2023, even though the Euribor had already surged in the markets.
The Euribor responds not only to what the ECB has done, but to what the market believes it will do over the coming months. That is why it typically moves before official meetings.
Why rates rise and fall
The ECB does not move rates arbitrarily. There are two main scenarios that determine the direction.
When inflation rises above the target, the ECB raises rates. By making credit more expensive, it slows consumption and investment, reduces demand in the economy and, over time, contains prices. This is what happened between 2022 and 2024, when European inflation exceeded 10% and the ECB carried out the fastest rate-hiking cycle in its history, bringing the deposit rate from -0.5% to 4% in just over a year.
When the economy slows or inflation falls below the target, the ECB cuts rates to stimulate credit, consumption, and investment. Lower rates make loans cheaper, encourage businesses to invest and households to spend or take on mortgages, and in theory push prices upward.
There is a third variable that matters increasingly: expectations. The ECB publishes macroeconomic projections and its own forward guidance, and the market adjusts the Euribor according to what it anticipates the bank will do over the coming months. This means the Euribor can start falling before the ECB has formally cut rates, if the market discounts such a move with sufficient conviction.
What happens to your savings and deposits
Interest rates do not only affect those who have debts. They affect those who have savings just as directly.
When the ECB keeps rates high, banks can offer more attractive returns on savings accounts, term deposits, and money market funds. Money sitting idle starts to generate something. This is what happened in Spain between 2023 and 2025, when twelve-month deposits returned to offering yields of 2 to 3% after years of virtually zero.
When rates fall, that return disappears progressively. Banks adjust their deposit offering, and money in current accounts is again silently eroded by inflation. In a low-rate environment, savings lose purchasing power even though the nominal figure does not change.
Two important nuances. First, banks do not pass on ECB moves symmetrically: when the ECB raises rates, banks tend to improve loan rates before improving savings rates; when the ECB cuts, they eliminate savings remuneration before lowering loan rates. Second, the nominal rate on a deposit is not what matters: what matters is the real rate, which is the nominal rate minus inflation. A deposit at 2% with 3% inflation implies a loss of purchasing power.
Money market funds, which invest in very short-term debt, are particularly sensitive to ECB rates: when the deposit rate is positive and high, money market funds replicate it very directly and with more liquidity than a traditional term deposit.
The effect on investments
The impact of interest rates on financial markets is more indirect but equally real.
Fixed income. Bonds have an inverse relationship with interest rates. When rates rise, existing bonds — which pay fixed coupons — become less attractive compared to newly issued bonds with higher coupons, so their market price falls. The opposite happens when rates fall: bonds already issued with high coupons gain value. Longer-duration bonds are more sensitive to these moves. Someone who buys a long-duration fixed income fund in a rising-rate environment can suffer significant losses even if the bonds do not default.
Equities. The relationship is less mechanical but equally relevant. Higher rates imply a higher cost of capital for companies — borrowing becomes more expensive — and a higher discount rate when valuing future cash flows. This particularly penalises growth companies, whose value is based on earnings expected far into the future. Low rates do the opposite: they reduce corporate borrowing costs and push investors towards riskier assets because safe assets offer nothing. This partly explains the spectacular performance of global equity markets between 2010 and 2021.
Real estate. More expensive mortgages reduce the purchasing power of potential buyers, which dampens housing demand and, with some lag, puts downward pressure on prices or stabilises them. Lower rates do the opposite: they expand borrowing capacity and stimulate demand.
How to guide your decisions through the cycle
Understanding the rate cycle does not mean trying to time the market — a task that rarely ends well. It means having a clear sense of which decisions make the most sense at each point.
In a high-rate environment: deposits and money market funds offer real positive yields that did not exist a few years ago, so it is worth parking money you are not going to invest. If you have a variable-rate mortgage, analysing whether switching to a fixed rate makes sense becomes especially relevant before the cycle turns. In fixed income, short-duration funds carry less risk of capital loss than long-duration ones.
In a falling-rate environment: the return on cash falls and idle money loses purchasing power more quickly; it is worth reviewing whether you are holding more cash than necessary in current accounts. Long-duration bonds benefit from falling rates. A variable mortgage may become progressively cheaper without you doing anything. And riskier assets — equities — tend to attract more capital flows in search of return.
Reading the cycle does not have to be sophisticated. It is enough to follow two indicators: ECB decisions at its monetary policy meetings — there are eight per year — and the twelve-month Euribor, published daily. The trend of both over the past six months will give you a clear enough picture of which phase you are in.
What is not advisable is to ignore them. Interest rates are not a technical detail reserved for economists: they are the price of money, and that price determines how much you pay to borrow, how much you earn on savings, and how much the assets in your portfolio are worth today. Understanding it does not change the rules of the game, but it does let you play with better information.
The Euribor will rise and fall. ECB decisions will change direction as the economy demands. What remains constant is the chain: monetary policy, interbank market, mortgages, deposits, investments. Knowing that chain turns headlines into useful information rather than noise.
