Double Taxation Treaties: How to Avoid Paying Tax Twice on Foreign Income in Rome

In a nutshell

If you live in Rome and receive income from abroad — a salary, a pension, rental income, dividends — you risk being taxed twice: once in the country where the income is earned, and again in Italy. To prevent this, Italy has signed double-taxation treaties with over 100 countries. On top of that, art. 165 of the TUIR (Italy's consolidated income-tax code) gives you a foreign-tax credit for taxes already paid abroad.

At a glance

Cost	Free for refund applications. Tax-residency certificate: marca da bollo (revenue stamp) €16.
Timeline	Tax-residency certificate: within 30 days. Mutual Agreement Procedure (MAP) for complex cases: can take years.
Where in Rome	Any of the 7 territorial offices of Agenzia delle Entrate (Italy's tax-revenue agency) — Roma 1 through Roma 7
Documents	ID document, €16 revenue stamp, the specific form required by the foreign country (e.g. W-8BEN for the USA, EU-DBA for Germany)

Italian tax resident? Then Italy taxes your worldwide income

Italy considers you a tax resident if, for more than 183 days in a year, you meet at least one of these criteria (art. 2 TUIR, updated by DLgs 209/2023):

• You are registered at the Anagrafe (civil-registry office at the Comune, which handles residency) of an Italian municipality
• Your domicile is in Italy (where you maintain your main personal and family ties)
• Your habitual residence is in Italy
• You are physically present in Italy for more than 183 days (new criterion from 2024)

Just one criterion is enough. If you're an Italian tax resident, you pay IRPEF (Italian personal income tax) in Italy on all income earned anywhere in the world (worldwide income, art. 3 TUIR). That's exactly where a treaty comes in.

How a bilateral treaty works

Italy's treaties follow the OECD Model Convention — a standard international template that sets out which country may tax which type of income. The basic principle is the distinction between the state of residence (where you live) and the source state (where the income is produced). The treaty then divides taxing rights between the two.

Four concrete examples:

Salary from a US employer — if you physically work in Italy for an American company, the Italy–USA Convention (art. 15) provides for taxation only in Italy. The US employer won't withhold US taxes if you submit Form W-8BEN. You declare the income in Quadro RC of your Italian return, converted to euros at the monthly average BCE exchange rate.

German pension — private pensions are taxed only in Italy (Italy–Germany Convention, art. 18). Public-sector pensions, however, are taxed in Germany (art. 19). In both cases you must declare the income in Italy and request an exemption abroad using Form EU-DBA and an Italian tax-residency certificate.

Dividends from US shares — the USA withholds a maximum 15% (Italy–USA Convention, art. 10). Italy taxes dividends at 26% with a flat withholding tax, but credits you the 15% already paid in the US. Net result: 15% USA + 11% Italy = 26% total.

Rental income from a Spanish property — rent is taxed where the property is located (Italy–Spain Convention, art. 6). You pay Spanish tax (Modelo 210) and also declare the income in Italy on Quadro RL. The Spanish tax is then offset via the foreign-tax credit.

The foreign-tax credit (art. 165 TUIR)

Even when a treaty allows both countries to tax the same income, you won't pay twice: art. 165 TUIR lets you deduct foreign taxes already paid from your Italian tax bill.

The formula:

Maximum credit = Italian tax × (Foreign income / Total worldwide income)

You claim this on Quadro CE in your Italian tax return (Modello Redditi PF — Italy's full annual income-tax return for individuals). Conditions:

• The foreign tax must have been definitively paid (i.e. not refundable)
• The foreign income must be included in your Italian taxable base
• The credit cannot exceed the share of Italian tax proportionally attributable to that foreign income

If the foreign taxes exceed the treaty cap, you can apply for a refund from the foreign country within their specific deadlines (e.g. 4 years for Germany, 3 years for France). Unused credit can be carried forward for up to 8 years.

How to get a certificate of Italian tax residency

When a foreign country asks you to prove you're a tax resident in Italy, you need to request a certificato di residenza fiscale from the Agenzia delle Entrate.

Where: any of the 7 Rome offices (Roma 1 Trastevere, Roma 2 Aurelio, Roma 3 Settebagni, Roma 4 Collatino, Roma 5 Tuscolano, Roma 6 Eur Torrino, Roma 7 Acilia). Book an appointment at agenziaentrate.gov.it.

What to bring: your ID and a €16 revenue stamp. The certificate is issued within 30 days (often sooner). It's in Italian, with a standard translation if the treaty requires one.

Each foreign country has its own specific form to attach: W-8BEN for the USA, Form 5000 for France, EU-DBA for Germany.

Mistakes to avoid

1. Not declaring foreign income in Italy. Even if you've already paid tax abroad, you must always include that income in your Italian return — then apply the credit. Omitting it exposes you to penalties of 120%–240% of the unpaid tax, plus penalties for not completing Quadro RW.
2. Skipping Quadro RW. If you hold foreign bank accounts, properties, crypto, shareholdings, or other assets abroad, you must complete Quadro RW every year — even if those assets produce no income. The penalty for omission ranges from 3% to 15% of the asset value (doubled for countries on Italy's tax-haven blacklist).
3. Converting foreign income at the wrong exchange rate. Use the BCE monthly average exchange rate for the month in which you received the income — not the daily rate or the 31 December rate. The Agenzia delle Entrate publishes the official rates each year.

Special cases

Dual tax residency: if two countries both claim you as a resident, the treaty applies the "tie-breaker rules" of art. 4 of the OECD Model. They're evaluated in order: where you have a permanent home available; where your centre of vital interests lies (family, work, assets); where you habitually live; your nationality. If the conflict still isn't resolved, the two tax authorities open a Mutual Agreement Procedure (MAP).

Inbound-worker regime (DLgs 209/2023): if you've moved to Rome from abroad for work, you may qualify for a 50% income exemption for 5 years, subject to specific conditions (tax residence abroad for at least 3 years, new employment relationship). See the dedicated Agenzia delle Entrate page.

High-net-worth new residents: individuals who transfer their tax residence to Italy can opt for a flat substitute tax of €100,000 per year on all foreign income (€200,000 for new applicants since DL 113/2024), under art. 24-bis TUIR.

Countries without a treaty: if the country where your income is produced has not signed a treaty with Italy, only Italian domestic law applies (TUIR + the blacklist decree). In these cases withholding rates may be higher and some degree of double taxation can be unavoidable.

Official sources

• MEF Department of Finance — Double-taxation treaties
• Agenzia delle Entrate — International taxation
• Agenzia delle Entrate — Foreign-income tax credit
• Agenzia delle Entrate — Inbound-worker regime
• OECD — Tax Treaties
• Normattiva — TUIR DPR 917/1986
• Normattiva — DLgs 209/2023 tax-residency reform
• Normattiva — DL 167/1990 fiscal monitoring

Legal references: DPR 917/1986 (TUIR) artt. 2, 3, 165; DL 167/1990 (Quadro RW); DLgs 209/2023 (tax-residency reform); OECD Model Tax Convention.