@VicG2 having gone through this thread again and agreeing with the comments of my colleague @SusanY1 , I am now even more confused as to what we are all talking about , So let me state my understanding of the situation:
(a) You a US person ( citizen/GreenCard) moved to Italy in 2023 ( exact date here may be necessary ). You have established tax home in Italy on xx/xx/xxxx. Exact date here matters.
(b) Assuming that you are a resident of Italy and under the US-Italy tax treaty you may be liable for taxes on your world income.
(c) We do not know the exact sources of your income -- you said US pensions , savings etc. Need details here to understand which ones are taxable by Italy. Note that this may mean that you have to resource these incomes for form 1116 ( foreign tax credit)
(d) You said you are filing your 2023 -- is this your original or amended
(d) you also said did not know you had to file return in Italy -- what do you actually mean. Generally as a resident in Italy you are taxed on world income ( my understanding )-- therefore you exact date and immigration/tax status in Italy is important.
Could you please help here by providing the requested info. and correct my understanding as necessary .
pk
