The Court of Justice of the European Union ruled in December 2025 that Poland breached EU law by endorsing constitutional rulings that rejected the primacy of binding EU judgments and by allowing a tribunal whose own makeup failed to meet basic standards of judicial independence.

In Case Commission v. Poland, the Luxembourg-based court held that Poland's Constitutional Tribunal "does not satisfy the requirements of an independent and impartial tribunal previously established by law." Dimitry Kochenov, lead researcher at the Rule of Law Group of Central European University's Democracy Institute, called the ruling a watershed moment.

"To say that a Constitutional Tribunal is not a court established by law in the eyes of EU law is definitely a first," Kochenov said.

The judgment carries no financial penalty. It does, however, draw a sharp line on what EU membership requires from national constitutional courts. The CJEU also rejected Poland's attempt to frame the dispute as a matter of constitutional identity.

What did Poland's Constitutional Tribunal actually do?

In 2021, the Constitutional Tribunal declared that key provisions of EU law could not be applied where they conflicted with Poland's constitution as interpreted by the tribunal itself. It then ordered Polish public authorities not to apply judgments of the CJEU.

That move effectively blocked national judges from enforcing EU law or following interim measures while related cases were still pending. Member states cannot invoke their constitutions to set aside treaty obligations once they have joined the bloc, the CJEU stressed.

The CJEU found that Poland's approach breached:

• The duty to provide effective judicial protection
• The principles of primacy and uniform application of EU law
• The binding nature of EU court judgments

Why does the 2015 appointments dispute matter?

The CJEU ruling addresses not only what the tribunal decided but who sat on the bench. In late 2015, after a contested parliamentary election, lawmakers lawfully elected three judges to soon-to-be-vacant seats on the Constitutional Tribunal.

The president refused to swear the three in. The new parliamentary majority then appointed its own candidates to the same seats. Those judges took office and sat on panels whose legality remained contested for nearly a decade.

A court's authority depends not only on what it decides but on whether it is properly constituted, the CJEU said.

What does the ruling change for practitioners?

For lawyers advising clients with matters touching EU law, the ruling sharpens an existing line of authority. Polish courts can no longer treat Constitutional Tribunal decisions that purport to override EU law as binding within the EU legal framework.

Laurent Pech, professor of law and dean of the Sutherland School of Law at University College Dublin, said the precedent strengthens the EU's hand in confronting similar rule-of-law backsliding elsewhere, where bodies "masquerading as courts" shield governments by invoking constitutional identity.

What are the practical obstacles to compliance?

Anna Wójcik, an assistant professor of law at Koźmiński University in Warsaw, said implementation will not be straightforward. The Constitutional Tribunal itself has already dismissed the judgment as a mere "decision," and the judges whose appointments are in question have shown no sign of stepping down.

Upcoming vacancies may create an opening to reshape the tribunal's composition. But Wójcik cautioned that turnover alone will not restore independence as long as the leadership structure remains intact, leaving Poland with "a Constitutional Tribunal operating in the form of an institutional hybrid."

Who defended the government position?

Notably, Poland's current pro-EU coalition did not. Warsaw accepted the European Commission's complaints, an unusual step in EU infringement proceedings and a break from the confrontational approach of the previous Law and Justice (PiS) government, which held power from 2015 to 2023.

Deputy Justice Minister Dariusz Mazur wrote on X that the CJEU ruling confirmed the tribunal is not independent because of unlawful judicial appointments. "The conclusion is one," Mazur wrote. "The Constitutional Tribunal must be rebuilt."

A European Commission spokesperson said Poland must now take the necessary steps to comply with the ruling.

What comes next?

Polish authorities now face clear legal obligations to bring the constitutional framework back into line with EU law, including addressing the contested rulings and restoring conditions for independent judicial review.

Wojciech Sadurski, Challis Professor in Jurisprudence at the University of Sydney and professor at the University of Warsaw, said the decision shifts the debate from abstract constitutional theory to the tribunal's basic legitimacy, weakening the authority of past rulings that relied on panels whose composition was contested.

How far and how fast that happens will depend on choices made in Warsaw. The court has now made the boundaries unmistakable.