What is the taxation on dividends?

Witholding tax on dividends from ordinary shares paid to a foreign individual investor amount to 27%. Specific fiscal conventions in place between Italy and single foreign countries can entitle to a reduction of said witholding tax under certain circumstances.
The foreign individual investor can claim to the Italian tax authority a reimbursement up to 4/9 of witholding (i.e. up to 4/9 of 27%) of tax paid abroad certified by the relevant tax authorities.
If you are non resident in Italy and you want to claim the reimbursement, please refer to the following pages of the web site of the Italian Ministry of Economy and Finance.