On November 8, 2022, the Court of Justice set aside the General Court’s judgment in the Fiat State aid case.[1] In doing so, the Court of Justice effectively annulled the Commission decision which found that the tax ruling granted to the Fiat Chrysler group by the tax authorities of Luxembourg was an unlawful tax break of €20–30 million.[2] The Court of Justice affirmed the supremacy of national law in corporate taxation and rejected the Commission’s attempt to develop an EU-wide arm’s length principle as a standard of review for Member States’ tax decisions under State aid rules. The judgment is a setback for the Commission’s policy of using State aid rules to target allegedly unfair tax deals for multinational companies.








