Mortgage Interest Rates May 2026: What Variable Rate Mortgages Pay

Key data

If you have a variable rate mortgage, the numbers that the Bank of Spain has just published are not a bureaucratic formality: they are what will set what you pay each month starting from your next review. The Resolution of May 4, 2026 from the Bank of Spain (BOE-A-2026-9792) contains the official reference interest rates for the mortgage market corresponding to May 2026.

This publication is neither optional nor discretionary. The Bank of Spain has a periodic obligation to disseminate these indices, and financial entities have a legal obligation to apply them. There is no room for negotiation on the reference index: what the Bank of Spain publishes is what is applied.

What does this regulation establish?

The resolution publishes the official reference interest rates for the mortgage market corresponding to the month of May 2026. These indices are the values used as the basis for calculating the interest rate applicable in each review period of variable rate mortgage loans.

The published indices include:

• EURIBOR: the most widely used reference index for variable rate mortgages in Spain. It is the rate at which European banks lend money to each other and the one that determines the payment of the vast majority of variable rate mortgages in the Spanish market.
• Other official reference rates for the mortgage market: additional indices that the Bank of Spain publishes periodically and that some entities may use as a reference in their mortgage contracts.

The mechanics are straightforward: when the review date of your variable rate mortgage arrives, your bank takes the value of the index published by the Bank of Spain in that period and adds the spread agreed upon in your contract. The result is the interest rate that will be applied to your loan during the following period.

This publication has immediate practical effects for families and entities operating in the Spanish mortgage market.

Economic and operational impact

The impact of this resolution occurs on two different levels:

For variable rate mortgage holders: the value of EURIBOR and other published indices directly determines the amount of the monthly payment in the next review period. A variation of tenths in EURIBOR can translate into differences of tens or hundreds of euros per month depending on the outstanding capital and remaining term.

For financial entities and mortgage lenders: the obligation to apply these indices implies systematically updating the conditions of referenced loans. Any deviation from the official published values constitutes a regulatory breach.

The Spanish mortgage market has a volume of variable rate loans that affects thousands of families, as noted in the resolution itself. The magnitude of the aggregate impact of this monthly publication is therefore very significant for the Spanish household economy.

Who does it affect?

• Variable rate mortgage holders: any person with a mortgage loan whose interest rate is reviewed periodically based on EURIBOR or another official index. The review may be annual or semi-annual, depending on what is agreed in the contract.
• Banking entities: they are obligated to apply the rates published by the Bank of Spain in updating the payments of their customers with variable rate mortgages.
• Non-bank mortgage lenders: any entity that grants mortgage loans referenced to these official indices is equally obligated by this publication.
• Financial and mortgage advisors: they must know these values to correctly advise their clients on the impact on their payments and on possible decisions regarding early repayment or change of conditions.
• CFOs and financial directors of companies with mortgage financing: companies that have variable rate mortgage loans on real estate assets will also see their payments affected in the next review.

Practical example

Imagine a company that has a mortgage loan on its facilities with outstanding capital of 500,000 euros, a remaining term of 15 years and an interest rate referenced to EURIBOR plus a spread of 1%, with annual review.

When the annual review date of that loan arrives, the banking entity will take the value of EURIBOR published by the Bank of Spain in May 2026 (or the reference month agreed in the contract) and add that 1% spread. The result will determine the new monthly payment for the following 12 months.

The same principle applies to a family with a 200,000 euro mortgage: a variation of 0.5 points in EURIBOR can mean a difference of between 40 and 80 euros per month in the payment, depending on the outstanding capital and term. Over the course of a year, that is between 480 and 960 euros difference in the total cost of the mortgage.

That is why knowing the value published in May 2026 and anticipating its impact before the bank's letter arrives is a financial decision, not just an informational one.

What should companies do now?

1. Locate your variable rate mortgage loans: identify which real estate financing of your company is referenced to EURIBOR or another official index, and what is the review date agreed in each contract.
2. Consult the official published value: access the Resolution of May 4, 2026 from the Bank of Spain in the BOE to know the exact value of EURIBOR and other indices published for this period.
3. Calculate the impact on your payment: with the new index value and the spread of your contract, calculate what your new monthly payment will be for the next period. If you do not have internal tools, your financial advisor can do it in minutes.
4. Evaluate optimization options: if the new rate turns out to be significantly higher, analyze whether it makes sense to make a partial early repayment, negotiate a novation with your entity or study subrogation to a fixed rate. Each option has costs and benefits that must be calculated case by case.
5. Verify that your bank applies the correct index: when you receive the review communication from your entity, check that the value of the index it applies matches the one officially published by the Bank of Spain. Entities are obligated to use official values.