The Supreme Court will decide whether those who paid Madrid's waste fee and did not appeal have a right to a refund
AEDAF announces that the Supreme Court admits its appeal against the Madrid High Court judgment on the waste fee: at stake, the right to a refund.
The Spanish Supreme Court has admitted the cassation appeal filed by the Spanish Association of Tax Advisers (AEDAF) against the judgment of the High Court of Justice of Madrid on the rule regulating Madrid City Council's waste fee. According to AEDAF itself on 5 November 2026, the High Court will thus decide whether those who paid the waste fee and did not appeal will have a right to a refund.
The admission was communicated by AEDAF itself —an interested party in the litigation— and corroborated by Europa Press, which adds the case's procedural context. Even so, the detail of the cassation grounds comes from the appealing association, so the exact scope of the question and the grounds of the appealed judgment will have to be confirmed with the admission resolution and, in due course, with the Supreme Court's judgment.
What is at stake: the effects of a fee's annulment
The substance of the matter touches one of the most sensitive questions of local tax law: what happens to the amounts paid under a tax when the rule regulating it is annulled. The question the Supreme Court will resolve, in AEDAF's formulation, is whether the right to a refund also reaches those who paid the fee and did not challenge the corresponding assessments or self-assessments at the time.
The answer has enormous practical impact. If the right to a refund is recognised generally, taxpayers who paid the fee without appealing could claim the undue payment; if it is limited to those who appealed, the refund will be confined to the disputes already underway. The question connects with the debate on the effects of declarations of illegality of tax rules and on whether prior individual challenge is required, a terrain in which case law —including constitutional case law— has been refining the scope of each declaration of unconstitutionality or illegality.
A known phenomenon: from the capital gains tax to waste fees
The case fits into a succession of major battles over local taxes that have ended in mass refunds. The best-known precedent is the tax on the increase in value of urban land —the municipal capital gains tax— whose partial declaration of unconstitutionality in 2017 and above all in 2021 caused a flood of refund requests and forced the legislator to reform the tax in record time. The practical lesson of that episode is the one that today interests taxpayers and advisers on the waste fee: the annulment of the tax does not automatically equal the refund of what was paid, and the restitutionary effects depend on the judgment's technique —unconstitutionality with limited effects versus simple annulment— and on respecting the deadlines and channels of claim.
The context: Madrid City Council's waste fee
Madrid's waste fee has been the subject of intense legal debate since its introduction. Fees for the provision of public services must respect the reserve of law in their essential elements and avoid duplication with other taxes levying the same economic capacity, requirements that constitutional case law has developed on numerous occasions. The judgment of the High Court of Justice of Madrid now under cassation review ruled on the regulatory rule of that fee, and the admission of AEDAF's appeal opens the door to the Supreme Court setting doctrine on the patrimonial consequences of its annulment.
For tax advisers —the group the appellant represents— the question is front-line: thousands of taxpayers, individuals and companies, paid the fee during the affected fiscal years, and the Supreme Court's answer will determine the refund claim strategy, the deadlines and the reasonable expectations of success.
The litigation also has a long history. In March 2026, the contentious-administrative chamber of the Madrid High Court annulled Tax Ordinance 8/2024, which regulated the fee, for "substantial defects" in its processing, as it did not incorporate the annexes on the study of waste generation by economic activities; but it rejected AEDAF's claim to extend the nullity to firm acts, under article 19.2 of the consolidated text of the Local Treasuries Regulating Act. In other words: the annulment would benefit only those who had challenged their assessments. AEDAF appealed that pronouncement in cassation and the City Council, for its part, also appealed the judgment: the Supreme Court admitted the municipal appeal in September, in a ruling that could be projected onto other municipalities' waste fees. According to the association, the High Court has also agreed preferential processing of its appeal.
The background case law hovering over the case
Waste collection fees have been in the courts for years. European and national case law has established several ideas that condition their design: the obligation to reflect the real cost of the service in the rate, the prohibition of the fee having a markedly revenue-raising character disconnected from the service provided, and the requirement that the tax base bear a relation to waste generation or to the capacity to pay linked to the service. When the judicial annulment of a tax ordinance is not accompanied by an explicit pronouncement on refund, the debate opens on whether taxpayers who paid have an automatic right to a refund or must claim individually through the channels of the General Tax Act, with the corresponding limitation periods.
What can be expected from the procedure
After admission, the appeal will follow the usual channels of contentious-administrative cassation: formalisation, opposition, conclusions and, where appropriate, deliberation and judgment. Until there is a judgment, any refund claims that may be considered should be assessed with prudence, taking into account limitation periods and the particularities of each taxpayer.
Prudence remains necessary because, although Europa Press has corroborated the admission and the procedural context, the fine detail of the grounds comes from the appealing party: neither does AEDAF's note fully develop them, nor is the Madrid High Court judgment analysed in this article; both will have to be examined when available to assess each party's positions. It is the same standard of caution required by any case-law analysis at the interlocutory stage, such as the one accompanying other recent procedural news from the High Court, like the admission of the appeal on proof of the economic cause in ERTE furlough schemes.
Refund of undue payments and limitation
In the most favourable scenario for taxpayers —annulment of the fee with restitutionary effects—, the procedural instrument is the refund of undue payments under article 32 of the General Tax Act, whose request is subject to the four-year limitation period. That rule turns time into a critical factor: the oldest fiscal years may fall outside if the claim is delayed, which explains the race of firms and claim platforms every time a major municipal fee falls in the courts. The cassation judgment will also clarify whether the annulment carries the refund generally or whether each taxpayer must prove their payment and their claim in time.
Relevance for taxpayers and law firms
If the Supreme Court recognised the right to a refund with general scope, the precedent would interest all taxpayers who paid the fee in non-time-barred fiscal years and the municipalities with similar tax figures in litigation. If, on the contrary, it conditioned the refund on prior challenge, it would reinforce the timeless practical lesson: challenging doubtful tax assessments within the deadline preserves options that simple payment can close. In both scenarios, the case will be required reading for local tax practice and for advising companies and individuals with property or activity in Madrid, at a time of great activity of the High Court on matters of general interest, as was the recent doctrine on the refund of the severance payment in cases of reinstatement.
Frequently asked questions
What has the Supreme Court admitted?
The cassation appeal filed by AEDAF against the Madrid High Court's judgment on the rule regulating Madrid City Council's waste fee, according to the association on 5 November 2026.
What will the Supreme Court decide?
According to AEDAF, whether those who paid the waste fee and did not appeal will have a right to a refund.
Is there already a judgment on the merits?
No. What has been communicated is the admission of the appeal; the resolution of the merits will come with the cassation judgment.
Who is the appellant?
The Spanish Association of Tax Advisers (AEDAF), which is also the source of the news, so the scope will have to be contrasted with the High Court's resolutions.
What should those who paid the fee do?
Follow the evolution of the appeal and consult their adviser on deadlines and the advisability of claiming in their specific case, since the Supreme Court's answer may condition the strategy.
Sources
Fuentes
The specific data in this article come from the official sources cited.
