The European Union’s top court will consider the legality of the UK’s online gambling point-of-consumption tax (POCT).

The UK implemented its 15% POCT last December, shortly after the Gibraltar Betting and Gaming Association (GBGA) launched a preemptive legal challenge. The GBGA believes the POCT discriminates against Gibraltar-licensed UK-facing operators and was primarily intended to boost the UK government’s tax coffers, rather than to protect UK punters from alleged harm.

On Tuesday, the UK’s High Court sided with the GBGA, announcing that it was sending the case to the Court of Justice for the European Union (CJEU). The High Court said the case raised a number of issues related to European Union law that would be best decided by the CJEU.

In issuing the High Court’s ruling, Lord Justice Charles agreed with the GBGA that the POCT was potentially in violation of Article 56 of the Treaty of the Functioning of the European Union (TFEU), which prohibits restrictions on the movement of goods and services between EU member states, unless said restrictions are intended to protect consumers.