Key data
| Regulation | Resolution of June 17, 2026, from the Bank of Spain, publishing certain official reference interest rates for the mortgage market |
|---|---|
| Publication | June 18, 2026 |
| Effective date | June 18, 2026 |
| Affected parties | Holders of variable-rate mortgages and financial entities with indexed loans |
| Category | Real Estate |
| Period | May 2026 (reference data) |
| Regulatory framework | Circular 5/2012 of the Bank of Spain |
| Average mortgage rate Spain (>3 years, free housing) | 2.986% |
| Average rate eurozone (1-5 years, housing) | 3.430% |
Variable-rate mortgages indexed to the official rates of the Bank of Spain now have their May 2026 figures to calculate reviews. The Resolution of June 17, 2026, published in the BOE on June 18, sets the average rate for mortgage loans over three years for free housing granted in Spain at 2.986%. For the eurozone market, the average rate for housing loans between one and five years stands at 3.430%.
These data are published monthly in accordance with the Circular 5/2012 of the Bank of Spain and are the legal reference that allows borrowers and financial entities to precisely calculate adjustments to the conditions of their existing mortgage loans.
What does this regulation establish?
The Bank of Spain publishes monthly, in compliance with Circular 5/2012, the official reference interest rates for the mortgage market. These indices are not rates that the central bank sets at its discretion: they are the statistical average of actual mortgage loan transactions recorded in the corresponding period.
For May 2026, the two published indices are:
| Index | Scope | Term | Rate (May 2026) |
|---|---|---|---|
| Average rate for mortgage loans for free housing | Spain | Over 3 years | 2.986% |
| Average rate for housing loans | Eurozone | Between 1 and 5 years | 3.430% |
These indices are used as substitute reference rates in variable-rate mortgage contracts when the main agreed index (usually Euribor) is not available or when the contract so provides. They also serve as a direct reference in mortgages that expressly incorporate them as a review index.
Economic and operational impact
The direct impact of these indices materializes at the time of the periodic review of the mortgage payment. If your variable-rate mortgage is indexed to any of these rates, the financial entity will apply the value published for May 2026 in the next settlement.
For financial entities, the official publication is the mandatory starting point for recalculating the conditions of all existing mortgage loans that have a review in this period. Any payment adjustment that does not start from these published indices would lack legal basis.
For mortgage borrowers, knowing these rates allows:
- Independently verify that the bank correctly applies the index in the review.
- Anticipate the amount of the next payment before receiving the entity's communication.
- Detect possible errors or discrepancies in the settlement.
Who does it affect?
- Holders of variable-rate mortgages indexed to the average rate of mortgage loans for free housing in Spain (over 3 years).
- Holders of variable-rate mortgages indexed to the average rate of housing loans in the eurozone (between 1 and 5 years).
- Financial entities and banks with existing mortgage loans indexed to these rates, which must apply them in periodic reviews.
- Financial advisors, wealth managers and real estate consultants who advise clients with variable-rate mortgages on the impact of reviews.
- Real estate developers and companies with mortgage financing on assets indexed to these rates.
- Law firms and legal advisors managing claims or reviews of mortgage conditions.
Practical example
Suppose a variable-rate mortgage with a pending capital of 150,000 euros, a remaining term of 20 years and indexed to the average rate of mortgage loans for free housing in Spain over three years.
With the May 2026 index at 2.986%, and applying a typical spread of, for example, 0.50 percentage points, the applicable rate in the review would be 3.486%. On 150,000 euros over 20 years, this translates to an approximate monthly payment of 870 euros.
If the holder wants to verify that their bank has correctly applied the index, they only need to consult the Resolution published on June 18, 2026 in the BOE (BOE-A-2026-13285) and check that the base rate used matches the 2.986% published.
For mortgages indexed to the eurozone rate (3.430%), the same exercise applies: the resulting rate would be the sum of 3.430% plus the spread agreed in the deed.
What should companies do now?
- Locate your variable-rate mortgage contracts: Identify which reference index appears in the deed. If it is the average rate of mortgage loans for free housing in Spain or the average rate of the eurozone, this data directly affects you.
- Note the official values: Average rate Spain (over 3 years): 2.986%. Average rate eurozone (1-5 years): 3.430%. Keep the BOE-A-2026-13285 reference as documentary support.
- Calculate your next payment before the bank's letter arrives: Add the official index to the spread agreed in the deed and apply it to the pending capital. If the figure does not match what the entity communicates to you, file a written claim.
- If you are a financial entity or advisor: Update loan review systems with the values published on June 18, 2026. The application of an index different from the official published rate may generate claims and litigation.
- Archive the resolution: Download and keep the Resolution of June 17, 2026 as documentary support for any review of conditions carried out with this data.
Frequently asked questions
What is the official average mortgage rate in Spain for May 2026?
The average rate for mortgage loans over three years for free housing granted in Spain for May 2026 is 2.986%, according to the Resolution of June 17, 2026 from the Bank of Spain published in the BOE on June 18, 2026.
What is the average mortgage rate in the eurozone for May 2026?
The average rate for housing loans between one and five years in the eurozone for May 2026 stands at 3.430%, in accordance with the same Bank of Spain resolution.
How do I know if my variable-rate mortgage uses these Bank of Spain indices?
You must review your mortgage loan deed. If in the variable interest rate section it states "average rate of mortgage loans over three years for acquisition of free housing" or "average rate of housing loans in the eurozone", then the indices published on June 18, 2026 are the ones your entity must apply in the next review.
How often does the Bank of Spain publish these official rates?
The Bank of Spain publishes these official reference interest rates for the mortgage market monthly, in compliance with Circular 5/2012. Each publication covers data from the previous month and is used for periodic reviews of indexed loans.
What if my bank applies a rate different from the officially published one?
If the financial entity applies in the review a rate different from the one officially published by the Bank of Spain (2.986% for Spain or 3.430% for the eurozone in May 2026), you have the right to claim. You can file a complaint with the Customer Service of the entity and, if you do not obtain a satisfactory response, with the Bank of Spain as the supervisory body.
Official source
Consult complete regulation in official source
Notice: This article is for informational purposes only and does not constitute legal advice. For specific decisions, consult a qualified professional. Source: https://www.boe.es/diario_boe/txt.php?id=BOE-A-2026-13285