The Italian poker sites have to pay 20% of their gross revenues in a levy to the Italian government.
This is not directly paid by the players but likely affects rewards and rake. Stars.it for instance typically rakes 5.5% rather than 5% at .com and caps the rake at a higher level €3 not €2 (5-10 players, NL above €0.10/€0.25).
As for Italian personal taxation, sorry I have no idea, all I have is the UK media which seems to think that pretty much all Italians are tax avoiders. Even the redditometro introduced to try and stop avoidance is presented as a symptom of Italian tax dishonesty.
http://www.economist.com/blogs/schum...-evasion-italy