Italy's incentive regimes cut your Italian tax, so the US credit shrinks with it.

If you qualify for an incentive regime, run the comparison rather than assuming the saving is real. Reduced Italian tax means a reduced credit on Form 1116, and the exclusion may become the better route instead. The two returns have to be modelled together.

IVIE and IVAFE are levied on foreign property and financial assets rather than on income. They are generally not creditable against US income tax, so they are a real cost rather than a timing difference.

The totalization agreement is one of the oldest in force and covers Italian social security, so a self-employed American contributing in Italy generally avoids the 15.3% US charge on a certificate of coverage.

For anyone transferring Italian tax residence from 1 January 2024, Legislative Decree 209/2023 replaced the older, more generous impatriate rules: broadly a 50% exclusion of qualifying employment and self-employment income, capped at €600,000 of income a year, for the year of transfer and the four following years, with conditions on prior non-residence and a commitment to remain resident. Descriptions written before 2024 describe a regime that no longer applies.

Italy's flat-rate regime for foreign pensioners moving to qualifying southern municipalities produces the same US arithmetic as the impatriate regime: a low Italian rate leaves little Italian tax to credit, and US tax on the same pension income does not go away because Italy charged little.