Italian income tax, the IRPEF, has three national bands: 23% to 28,000 euros, 35% to 50,000 and 43% above that. Those are the figures usually quoted, and they are incomplete.
Every taxpayer also pays an addizionale regionale, set by the region of residence, and most pay an addizionale comunale set by the municipality. Both are charged as a percentage of taxable income, not as a percentage of the tax due, which distinguishes them from the Belgian municipal surcharge and makes them proportionally heavier at lower incomes.
The two layers
Regions carrying health service deficits are required to apply higher rates, which is why the heaviest regional surcharges cluster in the south and in Lazio. Regions with balanced budgets sit at or near the statutory minimum.
Why they are charged in arrears
The surcharges are calculated on the previous year's taxable income and collected in instalments through payroll across the following year, with a balancing adjustment. This produces two effects that catch people out.
- A new arrival pays nothing in the first year and then meets a full year of surcharges in the second, which reduces net pay without any change in salary.
- Someone leaving Italy may still owe surcharges on the final year's income after departure.
- A change of address between municipalities takes effect from a reference date, so the move and the change in rate do not coincide.
- A fall in income is followed by surcharges calculated on the higher earlier income, in the same way the old French system worked before withholding at source.
What is surcharged
The base is taxable income for IRPEF purposes, which is gross salary less INPS social contributions at 9.19% and less certain deductions. It is not reduced by the employee tax credit, the detrazione, because that credit reduces tax rather than income.
This matters more than it sounds. A low earner whose IRPEF is reduced to nothing by the detrazione may still pay both surcharges, because they apply to income that remains taxable even where no national tax is due. The credit mechanism is covered in Italian detrazioni.
How large is the effect in practice
On a taxable income of 35,000 euros, a combined surcharge of 1.3% costs around 455 euros a year and one of 3.5% costs around 1,225. The difference of roughly 770 euros is not decisive on its own, but it is a permanent annual difference determined entirely by where you live.
Compared with the Swiss cantonal spread it is small. Compared with the Belgian municipal surcharge it is larger, because the Italian charge applies to income rather than to tax. The Swiss position is in the canton comparison.
The autonomous regions
Five regions hold special statutes with greater fiscal autonomy: Sicily, Sardinia, Valle d'Aosta, Friuli Venezia Giulia and Trentino-Alto Adige. The provinces of Trento and Bolzano in particular operate distinct arrangements with additional deductions and a generally lighter combined burden.
Separately, Italy has operated incentives to attract residents and workers to the south, including enhanced versions of the inbound worker regime with a higher exemption for those relocating to southern regions. Those are covered in the impatriati regime.
The Italian calculator applies an average regional rate, so your own region will sit above or below it. Start with the Italy Salary Calculator.