The charge relates to tax due for image rights earnings during the Italian's time as Real Madrid boss in 2014-15.
The Madrid Community Prosecutor's office claims the 61-year-old concealed revenues "intending to avoid his tax duties towards the public treasury with no justification".
But, asked about the matter in his news conference, Ancelotti said: "I think it's an ongoing dispute. A lot of players and managers have the same problem with the tax authorities in Spain. I leave it to my lawyers in Spain, they are experts so I'm not worried about this and am concentrating on the game tomorrow."