Most powers of the Constitutional Court are explicitly determined by the Constitution. In accordance with the Constitution, the Constitutional Court decides in particular on the conformity of laws (and other statutory instruments) with the Constitution (and with laws, respectively), on constitutional complaints of violation of human rights and fundamental freedoms by individual acts, on jurisdictional disputes between various state actors, on the unconstitutionality of the acts and activities of political parties, on appeals against a decision of the National Assembly regarding the confirmation of the election of deputies, on the accountability of the President of the Republic, the Prime Minister, and ministers, as well as on the conformity of a treaty with the Constitution in the process of ratifying the treaty.
The Constitution determines that also other matters may be vested in the Constitutional Court by laws. In accordance with this provision the Constitutional Court decides, inter alia, on appeals against a National Assembly decision on the election of Slovenian members to the European Parliament, on the admissibility of a National Assembly decision not to call a referendum on the confirmation of constitutional amendments, or on a request of the National Assembly to review the constitutionality of consequences which could occur due to the suspension of the implementation of a law or due to a law not being adopted in a referendum.
The Constitutional Court has several strictly defined procedures in which cases may be brought before it.