Special Taxes in Navarra 2026: What Changes for Your Business with the New AEAT-Hacienda Foral Agreement

Key data

Businesses operating in Navarra that are subject to special or environmental taxes now have a new coordination framework between the two administrations that oversee them. The AEAT and the Hacienda Foral de Navarra have formalised an addendum updating their tax collaboration agreement, published in the BOE on 6 April 2026.

The practical result: greater coordination between tax authorities, more uniform procedures and, potentially, greater capacity for cross-referencing data between both administrations regarding these businesses.

What does this regulation establish?

The addendum amends the existing collaboration agreement between the AEAT and the Organismo Autónomo Hacienda Foral de Navarra in two specific areas:

• Exchange of tax information: The flow of tax data between both administrations is strengthened. This means that information a business declares to the Hacienda Foral can be cross-checked more efficiently by the AEAT, and vice versa.
• Shared use of IT applications: Access to and joint use of the technological tools that both tax authorities use to manage Special Taxes and Environmental Taxes is expanded or modified.

The context is relevant: Navarra has a foral regime that entails differentiated tax management compared to the rest of the State. However, this management autonomy does not mean disconnection: coordination agreements with the AEAT are the mechanism that ensures there are no duplications or gaps in tax control.

This addendum updates that mechanism, seeking greater administrative efficiency and preventing businesses from falling into a space of reduced oversight due to a lack of coordination between administrations.

Economic and operational impact

This type of coordination agreement between administrations has direct operational consequences for affected businesses, although it does not in itself imply new tax burdens:

• Greater data cross-referencing: By strengthening the exchange of information, discrepancies between what is declared to the Hacienda Foral and what the AEAT holds on record will be more easily detectable. This increases the risk of inspection for businesses with inconsistencies between their filings.
• Harmonisation of procedures: Control and filing procedures are aligned between both tax authorities. Businesses that operated under different criteria depending on which administration they were dealing with must review whether their internal processes remain valid.
• Management applications: If your business uses the Hacienda Foral's IT applications to manage special or environmental taxes, there may be changes to the available tools or data submission formats.
• No new amounts or tax rates: The addendum does not modify tax rates or create new payment obligations. The impact is procedural and related to oversight, not an additional tax burden.

Who is affected?

This regulation directly affects businesses operating in Navarra that are subject to any of the following taxes:

• Impuesto sobre Hidrocarburos
• Impuesto sobre el Alcohol y Bebidas Derivadas
• Impuesto sobre la Cerveza
• Impuesto sobre Productos Intermedios
• Impuesto sobre las Labores del Tabaco
• Impuesto sobre la Electricidad
• Impuesto sobre el Carbón
• Environmental taxes applicable in the territory of Navarra

It also affects tax advisors and managers handling the tax affairs of these businesses, as they must be aware of the new coordination procedures between administrations to ensure proper compliance.

Practical example

A hydrocarbon distribution company headquartered in Pamplona files its Impuesto sobre Hidrocarburos returns with the Hacienda Foral de Navarra. Until now, the cross-referencing of that information with the data held by the AEAT depended on the previous agreement.

With the new addendum, both administrations share that information more efficiently and use coordinated management applications. If the company has any discrepancy between its declarations to the Hacienda Foral and the data the AEAT holds on its operations at the national level (for example, product purchases from domestic suppliers), that discrepancy will be more easily detectable by either administration.

The practical result for this company: it becomes increasingly important to have the documentation of its operations perfectly aligned between what it declares in Navarra and what its suppliers or customers declare to the AEAT.

What should businesses do now?

1. Identify whether you are affected: Check whether your business operates in Navarra and is subject to special taxes (hydrocarbons, alcohol, tobacco, electricity, coal) or environmental taxes. If so, this agreement directly affects you.
2. Review the consistency of your filings: Ensure that the information declared to the Hacienda Foral de Navarra is consistent with the data that your suppliers, customers or the AEAT itself may hold regarding your operations. Greater data cross-referencing increases the risk of discrepancies being detected.
3. Consult your tax advisor: Ask your advisor to review whether the special tax filing and control procedures in Navarra have changed as a result of this agreement, particularly with regard to management IT applications.
4. Check the management applications: If you use the Hacienda Foral's IT tools to manage these taxes, verify whether there are system updates or changes to data submission formats resulting from the new coordination with the AEAT.
5. Keep your documentation in order: In an environment of increased information sharing between administrations, the documentary traceability of your operations subject to special taxes is more important than ever. Make sure you retain all required supporting documents and records.

Official source

Disclaimer: This article is for informational purposes only and does not constitute legal advice. For specific decisions, please consult a qualified professional. Source: https://www.boe.es/diario_boe/txt.php?id=BOE-A-2026-7786