The following documents must be filed by non-EU citizens applying for a permanent residence permit in Italy:
proof that the foreign citizen has lived in Italy for 5 years (the temporary residence permit);
the registration certificate issued by the local police force upon entering Italy;
proof of having a legal address in Italy (a rental contract or a recent utility bill);
proof of means of self-sustenance (bank statements, tax returns, payslips issued by the employer);
the criminal record and the application form issued by the Italian authorities.