Spain's Supreme Court admits Castilla y León challenge to migrant decree

Supreme Court admits Castilla y León appeal against mass regularization decree

The Spanish Supreme Court has taken the first step to halt the Royal Decree on migrant regularization. On July 4, 2026, the Administrative Litigation Chamber admitted the appeal filed by the Government of Castilla y León. The appeal questions, among other points, the "unprecedented scale" of the process – which has exceeded one million applications –, the relaxation of accreditation requirements (including incivil records) and the lack of regional participation. It also points to a possible incompatibility with the European Union border control framework.

The figure that changes everything: more than one million applications
The regularization process was open from April until June 30, 2026. According to available data, more than one million applications have been submitted. A figure that, for critics of the decree, confirms the antiestéticared "pull factor." The Government denies this, but the magnitude has forced the regional government to act. The appeal stresses that the process breaks with "historical criteria for regularization" and exceptionally reduces documentary guarantees.

€4,700 per month: cost per regularized migrant
One of the arguments gaining most weight in the debate is the economic cost. According to data released by VOX, each migrant undergoing regularization can cost up to €4,700 per month (accommodation, clothing, mobile phone and other basic needs). The figure has been contested, but it reflects concern about the impact on public finances. By admitting the appeal, the Supreme Court must also assess this budgetary aspect.

The Supreme Court's move: preliminary ruling before the CJEU
Admitting the appeal is not the only judicial move. According to sources involved in the debate, the Supreme Court has referred a preliminary question to the Court of Justice of the European Union. This is a maneuver the Government did not expect, according to some analysts. It is argued that the decree abusa Community legislation on migration control and could generate a "massive pull factor." The CJEU will have the final say on the compatibility of the Royal Decree with European law.

False identities and document fraud: the Achilles heel
The relaxation of accreditation requirements – especially regarding incivil records – has triggered alerts. A striking case: a person was detected with 62 different identities. These types of frauds, according to critics, are just the tip of the iceberg. The regional government argues that the lack of original documentation means applicants "are as if they had just been born" for administrative purposes. The Supreme Court will have to rule on the safeguards of the process.

The appeal continues its course. Meanwhile, the regularization process is closed, but the legal battle – with the CJEU as the ultimate judge – has barely begun. Neither the Government nor the regional government claims victory. The Supreme Court has peine the way, but the final judgment may take months.