Transport fuel aid in 2026: what changes in October and how to prepare each vehicle
Royal Decree-Law 25/2026, published on 30 September and in force since 1 October, extends until December per-litre aid for certain owners of vehicles entitled to the professional diesel refund. It also introduces separate aid, calculated per vehicle, for transport professionals who cannot claim that refund for certain units in their fleets. These are not two names for the same benefit. The first follows diesel consumption and the procedure linked to the professional diesel card; the second requires an electronic application during a later period and depends on the authorisation, vehicle and activity. This distinction is especially important for mixed fleets and for vehicles registered in the Canary Islands, which are expressly included in several categories of the new table. The statutory reference is the original text of Royal Decree-Law 25/2026 in the BOE.
Two routes to aid that must be reviewed vehicle by vehicle
The first question is not how much fuel the company buys, but whether each vehicle meets the conditions in Article 52 bis of the Excise Duties Law for the partial refund of diesel used for professional purposes. If it does, Article 28 of the new decree extends the extraordinary per-litre aid for supplies in October, November and December. If it does not, a separate route may be available under Article 30, but only for the professionals, authorisations, activities and vehicle types listed there. A company having a truck eligible under the first route does not automatically make its vans or taxis eligible under the second: an individual record must be prepared for each registration number, and its registry details must be checked.
Per-litre aid for those entitled to the professional diesel scheme
Article 28 sets aid for October at €0.05 per litre of general-use diesel used as fuel in vehicles that meet the conditions in Article 52 bis. The text sets €0.12 per litre for November and €0.19 for December, but those later amounts are not an unconditional promise: they may fall depending on the Hydrocarbon Tax rates applicable in those months under the decree’s own rules. A cash-flow forecast should therefore distinguish the amount already applicable to October from the possible scenarios for November and December, without presenting the future nominal figures as guaranteed payments.
The extension is also governed by Articles 22 and 23 of Royal Decree-Law 18/2026. For supplies at retail outlets, payment with the regulated professional diesel card is a condition of the aid and counts as an application. At own-use facilities, the specific identification and management obligations laid down for the refund apply. The administration calculates the aid at the end of each calendar month and, where applicable, pays it into the account provided for registration in the relevant tax register. It would not be appropriate to advise filing a second, generic application through this route without reviewing the procedure applicable to the case.
There is an apparent paradox that calls for careful reading. Article 16 of the decree sets the rate of the partial tax refund regulated by Article 52 bis.6 at zero euros between 1 October and 31 December. That does not, in itself, abolish the extraordinary per-litre aid under Article 28: they are different legal concepts. The first temporarily changes the tax refund; the second extends extraordinary support for owners who meet the eligibility conditions of the professional diesel scheme. Confusing a “zero refund” with “no aid” could lead to the wrong decision about the fleet.
Direct per-vehicle aid for other transport units
Article 30 applies to self-employed individuals and companies with legal personality lawfully established in Spain that, when the decree enters into force, hold the authorisations or own the means of transport specified in the law. It includes classes VDE, VT, VTC, VSE, MDLE and MDPE, with the vehicles assigned to them and the required registration in the Register of Transport Companies and Activities; it also covers certain urban buses registered with the traffic authorities and a specific case involving adapted taxis. The activity must also fall under one of the Business Activities Tax (IAE) headings listed in paragraph 3, including collective urban transport, taxis, road passenger transport, ambulances, freight transport, removals and certain intermediary activities. It is not enough for the commercial activity to be informally described as “transport”.
The amount is based on a table of fourteen categories. Among the examples expressly listed, a diesel MDPE heavy goods vehicle of at least 7.5 tonnes registered in the Canary Islands is assigned €1,800; an MDLE light goods van, €180; a petrol VT taxi, €120; and a diesel VDE bus registered in the Canary Islands, €1,000. These are reference amounts from the table, not an assessment of what the company will receive. For categories 3, 4, 5, 7, 8 and 9, Article 30 provides for reduction coefficients if certain future price and tax scenarios occur; a definitive figure requires checking which of those scenarios materialises. It is also necessary to verify that the unit is not eligible for the professional diesel refund.
When and where to apply for per-vehicle aid
The statutory period for electronic applications for the aid under Article 30 runs from 1 November to 31 December 2026. As of this article’s publication date, 2 October, that period has not yet begun. Applications must be submitted using the form made available on the electronic portal of the competent tax administration and must include the bank account designated for payment. The decree states that payment, where appropriate, will be made by bank transfer from 1 December; that does not guarantee that every application will be decided or paid on that day.
The administering authority is determined by the beneficiary’s tax domicile, not by the route a truck travels. The state tax agency (AEAT) administers aid for those whose tax domicile is in the territory under the common tax regime; the relevant regional tax administration does so for tax domiciles in the Basque Country or Navarre. For a company whose tax domicile is in the Canary Islands, the relevant authority under this scheme is the AEAT. If the tax domicile and a vehicle’s registered domicile differ, those details must be kept separate because they answer different questions: administrative jurisdiction in one case and the table category in the other.
Conditions that may affect payment or require repayment
Additional Provision Four makes the full effectiveness of the aid in Chapters IV and V subject to compatibility with European State aid rules. As a matter of prudence, publication of the decree should not be described as an automatic, irreversible payment: an individual entitlement requires verification of the requirements, the administrative procedure and that condition of effectiveness. A company should not deduct the aid from an invoice or promise it to a customer as though it had already been awarded. The Sole Transitional Provision also states that this aid and these reductions are not taken into account when calculating transport price revisions resulting from changes in fuel costs.
There are subsequent conditions that may have significant consequences. Until 31 December, Article 36 restricts certain dismissals on grounds of force majeure or economic, technical, organisational or production reasons arising from the situation to which the decree responds for companies receiving direct aid; non-compliance entails repayment and the classification as null and void laid down in the law. This is not a general prohibition on every termination of employment and should not be applied without examining the grounds and the beneficiary. Article 37 adds a conditional obligation: if a beneficiary company is among those required by Law 9/2025 to have a sustainable commuting plan, failure to meet that duty may require it to repay the aid. Employment advisers should review both points before staffing decisions are made.
How to organise a mixed-fleet review
- Separate eligibility from the amount: first establish that the vehicle falls within the scheme; then calculate the figure applicable to the period or category.
- Separate the dates: the law has been in force since October, but the application for per-vehicle aid is submitted from November.
- Separate tax and registry details: the tax domicile determines the competent authority; the vehicle’s registered domicile may determine its category.
- Document the scenario: the per-litre figures for November and December and certain per-vehicle aid amounts may change under the conditions laid down by law.
- Review subsequent obligations: State aid, employment and the commuting plan, where applicable to the beneficiary.
This preparation also helps produce an honest cash-flow estimate. A forecast can distinguish between the “table amount”, the “conditional amount” and the “approved payment” without conflating them. A tax review for self-employed individuals and SMEs can check the tax position and documentation; for companies in the archipelago, tax advice in Tenerife and the Canary Islands can help organise the particulars of domiciles and registers; and if the aid affects staffing decisions, a specific employment-law review is appropriate. These links provide ways to seek advice; they do not replace checking the individual case file.
Frequently asked questions
Does setting the professional diesel refund at zero eliminate the per-litre aid?
No. Article 16 temporarily sets the tax refund rate under Article 52 bis.6 at zero, while Article 28 extends separate extraordinary aid for owners of vehicles entitled to the professional diesel scheme. The requirements and the specific fuel supply must be checked.
Can I apply for the direct per-vehicle aid now, in October?
No, under the period set in Article 30.4: electronic applications open on 1 November and close on 31 December 2026. October is the time to check authorisations, activities, vehicles and bank details, and to watch for the official form to become available.
Can the same company use both routes?
It may have vehicles that fall under different routes, provided each unit meets the relevant requirements. The prohibition on overlap applies to the vehicle: per-vehicle aid does not generally apply to units entitled to the professional diesel refund, except for the special Eurotaxi case provided for in the decree.
Official sources and scope
- BOE: Royal Decree-Law 25/2026, original text published on 30 September 2026, especially Articles 16, 28, 30 to 31 and 36 to 37, and Additional Provision Four.
- BOE: Royal Decree-Law 18/2026, Articles 22 and 23, whose procedure applies to the per-litre extension.
- AEAT: updates on Hydrocarbon Tax, 30 September 2026.
Information checked as of 2 October 2026. This guide explains the general framework published in the BOE; it does not, on its own, determine the eligibility of a particular registered vehicle, the final amount or its individual accounting or tax treatment. The European conditions, the rates applicable in subsequent months and the instructions on the competent authority’s electronic portal must be reviewed before applying for or recording the aid.
If you manage a fleet with different vehicles and authorisations, Advixy can help you prepare an eligibility matrix and review your documentation before the application period opens. Request a review of your case with your registration numbers, authorisations and tax details to hand.
