At the moment of the announcement, there were four hours left to conclude the process in which the permanence in power of Prime Minister Viktor Orban is determined.
The day will also serve as a referendum on a law that prevents homosexuality from being discussed in schools and national media.
Political scientist Péter Krekó, director of the Political Capital institute, told the private television network ATV that it is not possible to predict who these data favor.
The current Hungarian administration is being questioned by the European Union (EU) regarding freedom of expression and national laws that, according to the EU, restrict the actions of judges and magistrates in this country.
On the other hand, the Child Protection Act, also questioned by the EU, limits the content on gender ideology in education, according to the EU, which opened an infringement procedure against Hungary.
Although previous polls predicted the closest vote in the last decade, they gave Fidesz a small lead in a process marked largely by undecided voters who seem to be moving away from the minority political forces.