Hello Everybody, I have the opportunity to work in USA and I'm resident in Italy and also an Italian citizen. Once I have the visa permit to work in usa, If I will pay less taxes in USA than what is due in Italy then should I pay the difference in Italy even though I did not work/live in Italy even the whole year?? Someone can help me?

I am NOT an expert in Italian taxes, but, normally, European countries do NOT tax income earned outside of the home country. You should consult with an Italian tax expert to confirm that assumption.

You DO have to pay taxes to the United States on the income earned while physically present in the United States. This includes federal and state income taxes, plus FICA (Social Security and Medicare) taxes.

If, for some reason, you DO have to pay Italian taxes on U.S.-sourced income earned while living and working in the U.S. you will be able to claim a tax credit on your Italian tax return for the income taxes paid to the United States.

Further, under the totalization agreement with Italy, your FICA and Medicare payments will be credited to the Italian-equivalent of Social Security.