Any help with taxes?Hello...

Any help with taxes? Hello all, I am a Marie Curie experienced researcher at a company in Italy, within an Innovative Training Network. I am having troubles to understand how taxes are calculated and I am wondering if anybody can give some input. The company is deducting from my annual gross what they call "company costs" (I want to understand these are kind of taxes like social security for having an employee, etc., although there is no number or document that they can show me). This makes around 1/3 of the total annual gross from the fellowship. I receive the remaining 2/3 gross, of which I pay around 50% taxes. In summary, I receive around 1/3 of the annual gross of the MC fellowship as net salary, which is even lower than some PhDs in other countries in my network. Anybody knows if this "company costs" have to be paid from my salary or from other parts of the project budget? Anybody in Italy that can share her/his experience? Thanks for any help and best regards! Laura