Key data
| Regulation | Resolution of November 4, 2026, from the General Technical Secretariat — summons in administrative litigation 984/2026 |
|---|---|
| Publication | November 11, 2026 |
| Entry into force | Not specified (procedural deadline of 9 business days from publication) |
| Affected parties | Companies and entities required to file Corporate Income Tax for fiscal year 2025 |
| Category | Tax News |
| Fiscal year | 2025 |
| Challenged regulation | Order HAC/529/2026, which approves the declaration models for CIT and NRIT for fiscal years beginning in 2025 |
| Appellant | MRW Courier Group, SA |
| Judicial body | National Court, Administrative Litigation Chamber, Second Section |
| Case number | 984/2026 |
| Deadline to intervene | 9 business days from publication in the Official Gazette |
| Legal basis for summons | Article 49 of Law 29/1998, regulating Administrative Litigation Jurisdiction |
The official Corporate Income Tax models for fiscal year 2025 are being challenged in court. MRW Courier Group, SA has filed administrative litigation case 984/2026 before the National Court (Administrative Litigation Chamber, Second Section) against Order HAC/529/2026, the regulation that approves the declaration forms for CIT and Non-Resident Income Tax (NRIT) for fiscal years beginning in 2025.
The Resolution of November 4, 2026, published in the Official Gazette on November 11, 2026, formalizes the mandatory summons provided for in Article 49 of Law 29/1998, which regulates Administrative Litigation Jurisdiction. This opens the door for any company or entity affected by these models to intervene in the proceedings and defend its interests, but the deadline is extremely short: 9 business days.
What does this regulation establish?
The published resolution does not resolve the merits of the case: its function is strictly procedural. It communicates that MRW Courier Group, SA has appealed Order HAC/529/2026 and that, in accordance with Article 49 of Law 29/1998, any interested party is summoned to appear in the judicial proceedings.
What is relevant for companies is the subject matter of the appeal: Order HAC/529/2026 is the regulation that approves the official declaration models for Corporate Income Tax and Non-Resident Income Tax for fiscal years beginning in 2025. In other words, the very forms that all corporations must use to file their annual CIT declaration for fiscal year 2025 are being challenged.
If the National Court upheld the appeal in whole or in part, it could declare these models null or modify them, which would have direct consequences for the CIT 2025 filing process for all Spanish companies.
Economic and operational impact
At this point, the impact is mainly one of procedural uncertainty. The appeal does not automatically suspend the obligation to file CIT 2025 nor does it invalidate the models while the proceedings are ongoing. However, it creates two types of operational risk that companies should assess:
- Risk of model nullification: If the National Court upheld the appeal, the official forms could be declared null or require modification, which would force companies to redo declarations already filed or wait for new models.
- Opportunity to intervene: Companies that have their own objections to the content of Order HAC/529/2026 can take advantage of this proceeding to assert their interests, but only within the 9 business day deadline from November 11, 2026.
The direct cost of intervening in the proceedings involves having legal representation before the National Court, which entails attorney and court representative fees. The decision to do so must be made quickly and by assessing whether the company has a concrete legitimate interest in the outcome of the appeal.
Who does it affect?
- All corporations required to file Corporate Income Tax for fiscal year 2025 (fiscal years beginning in 2025).
- Non-resident entities subject to Non-Resident Income Tax (NRIT) that also use the models approved by Order HAC/529/2026.
- Tax advisors and accounting firms that prepare CIT declarations for their clients and must stay informed of the appeal's progress.
- CFOs and financial directors of companies that wish to intervene to defend their interests in the proceedings.
- Companies in the logistics and courier sector, which share a sectoral context with MRW Courier Group, SA, although the appeal applies generally to all taxpayers.
Practical example
A mid-sized distribution company, required to file CIT for fiscal year 2025, discovers that Order HAC/529/2026 includes in its models some section or box that it considers exceeds what is legally provided or that creates an information obligation not supported by higher-ranking legislation.
That company, upon reading the Official Gazette publication of November 11, 2026, has 9 business days to intervene in case 984/2026 before the National Court, Second Section, under Article 49 of Law 29/1998. To do so, it must act immediately: contact its tax advisor and a lawyer specialized in Tax Law with experience before the National Court, assess whether its interest in the proceedings is sufficiently concrete and, if so, file the intervention brief within the deadline.
If it does not act within that deadline, it will lose the opportunity to participate as a party in the proceedings, although the outcome of the appeal will still affect it if the National Court modifies or nullifies the models.
What should companies do now?
- Act in the next 24-48 hours: The 9 business day deadline from November 11, 2026 is very short. If your company has any interest in the outcome of the appeal, do not wait.
- Consult with your tax advisor: Assess whether Order HAC/529/2026 creates any obligation or burden in the CIT 2025 models that you consider questionable or that specifically harms you.
- Consider intervention with a specialized lawyer: Intervening before the National Court requires an attorney and court representative. Weigh the cost against the potential benefit of influencing the outcome of the appeal.
- Follow the progress of the proceedings: Even if you do not intervene, the outcome of case 984/2026 may affect the models you use to file CIT 2025. Stay informed through Official Gazette publications and your advisor.
- Do not halt preparation of the CIT 2025 declaration: The appeal does not suspend the obligation to file CIT. Continue preparing the declaration using the current models from Order HAC/529/2026 until there is a judicial ruling to the contrary.
Frequently asked questions
What is case 984/2026 and what models does it challenge?
It is the administrative litigation case filed by MRW Courier Group, SA before the National Court (Administrative Litigation Chamber, Second Section) against Order HAC/529/2026. This order approves the official declaration models for Corporate Income Tax and Non-Resident Income Tax for fiscal years beginning in 2025.
What is the deadline to intervene in the appeal against the CIT 2025 models?
The deadline is 9 business days from the publication of the summons resolution in the Official Gazette, which took place on November 11, 2026. This deadline is set by Article 49 of Law 29/1998, which regulates Administrative Litigation Jurisdiction.
Do I have to continue filing CIT 2025 even though there is an appeal against the models?
Yes. The appeal does not automatically suspend the obligation to file Corporate Income Tax nor does it invalidate the models while the proceedings are ongoing. You must continue preparing and filing the declaration with the current models from Order HAC/529/2026 unless the National Court expressly orders precautionary suspension.
What consequences would it have if the National Court upheld the appeal?
If the appeal succeeded in whole or in part, the National Court could declare the models approved by Order HAC/529/2026 null or require their modification. This could force the Administration to approve new forms and, potentially, require companies that had already filed their declaration to redo it.
What companies can intervene in case 984/2026?
Any company or entity that has a legitimate interest in the outcome of the appeal can intervene, in accordance with Article 49 of Law 29/1998. In practice, this includes all corporations required to file CIT for fiscal years beginning in 2025 and entities subject to NRIT that use the models approved by Order HAC/529/2026. Intervention requires an attorney and court representative before the National Court.
Official source
View complete regulation at official source
Disclaimer: 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-2026-23652
