The Italy–U.S. Tax Treaty, Secondments and Social Security

U.S.–Italy tax treaty withholding rates

Short answer: under the U.S.–Italy income tax treaty, cross-border dividends are taxed at source at 5% (parent owning 25%+ of the voting stock for 12 months) or 15%, interest at 10%, and royalties at 0%, 5% or 8% depending on the type. Without the treaty, the U.S. withholds 30%. The rates apply in both directions: U.S. subsidiary to Italian parent, and Italian company to U.S. recipient.

To claim the reduced rate on payments from the U.S., the Italian recipient gives the U.S. payer Form W-8BEN-E (companies) or W-8BEN (individuals), and must meet the treaty's limitation-on-benefits test. See withholding on payments to Italy below.

The Italy-U.S. income tax treaty at a glance

The Italy-U.S. Convention for the avoidance of double taxation was signed on August 25, 1999, with a Protocol, and entered into force only on December 16, 2009. It applies to withholding taxes from February 1, 2010 and to other taxes from January 1, 2010, replacing the 1984 treaty. On the Italian side it covers IRPEF, IRES and IRAP; on the U.S. side, federal income taxes. It does not bind U.S. states or cities, a recurring surprise for Italian companies.

Three features matter for employers: the saving clause (the U.S. taxes its own citizens and residents, including green card holders, as if the treaty did not exist); a limitation on benefits (LOB) article that an Italian company must satisfy before claiming reduced withholding rates; and pre-BEPS permanent establishment definitions, since the U.S. has not signed the OECD Multilateral Instrument.

Permanent establishment: when U.S. staff make the Italian company taxable

A permanent establishment (PE, stabile organizzazione) is the point at which the Italian parent itself, not a U.S. subsidiary, becomes subject to U.S. federal corporate income tax (21%) on profits attributable to U.S. activity, plus the branch profits tax (reduced under the treaty). Under Art. 5 a PE arises in two main ways:

• Fixed place of business: an office, branch or similar place through which the business is carried on. A U.S. employee's home office can qualify if it is at the company's disposal (the company requires it, pays for it or lists it as a business address) and core activities happen there.
• Dependent agent: a person (typically an employee) who habitually exercises authority to conclude contracts in the name of the Italian company. A U.S. sales director hired directly by the Italian SpA who negotiates and signs customer contracts is the classic trigger.

Preparatory or auxiliary activities (storage, display, purchasing, market research) do not create a PE on their own, nor does an independent agent acting in the ordinary course of its business.

The domestic U.S. threshold is lower

Without the treaty, a foreign company is taxed on income "effectively connected" with a U.S. trade or business, a lower bar than PE. The treaty protects you only if you claim it: a foreign corporation relying on it should file Form 1120-F with Form 8833 (treaty-based position). A timely 1120-F also preserves deductions if the IRS later finds a PE.

States do not follow the treaty

A single employee working in California, New York, New Jersey or Illinois can create state income or franchise tax nexus, sales tax obligations and a payroll registration duty for the Italian company, even with no federal PE. See the state guide.

Social security: the Italy-U.S. Totalization Agreement

The income tax treaty does not cover social security. That is handled by a separate bilateral agreement signed in 1973, in force since November 1, 1978 and amended by a supplementary agreement effective January 1, 1986. It avoids double contributions and lets workers combine periods of coverage for pensions.

A nationality-based rule, not the usual five-year detachment

Most U.S. totalization agreements keep a posted worker in the home system for up to five years. The Italy agreement is older and works differently: coverage depends on the worker's nationality and on who the employer is, with no fixed time limit.

An Italian national who elects Italian coverage can change the choice during the second year after the work begins, or when acquiring or losing U.S. permanent residence. Exempt workers avoid U.S. Social Security and Medicare taxes (FICA: 6.2% on wages up to the 2026 wage base of $184,500, plus 1.45% Medicare with no cap, each for employer and employee). FUTA and state unemployment taxes are not covered and may still apply.

Certificates of coverage

• Italy to U.S.: the Italian employer requests a certificate of coverage (form IT/USA 4) from the INPS office for the province where the employer is located, giving the worker's details, both employers' names and addresses and the start date. Ask the local INPS office about the current submission channel. The U.S. payroll provider keeps a copy to justify not withholding FICA.
• U.S. to Italy: the U.S. employer requests a certificate from the SSA Office of International Programs, online at socialsecurity.gov/coc or by mail.

Totalization of benefits

A person with a split career can combine periods of coverage to qualify for a benefit, with each country paying a pro-rata pension for its own periods. On the U.S. side at least six quarters of coverage are required. Verify Italian minimums with INPS.

Secondment (distacco), local hire, transfer or EOR

There are four common ways to have someone working for you in the U.S.: a secondment (the employee keeps the Italian contract and is assigned to the U.S. subsidiary with a return clause); a local hire by the U.S. subsidiary under an at-will contract (licenziabilità senza giusta causa); a transfer (the Italian contract ends or is suspended and the person is re-hired locally, usually for a permanent move); or an EOR (Employer of Record), a third-party U.S. employer that hires the person and invoices you.

Article 15 and the "economic employer"

The 183-day exemption requires all three conditions: 183 days or less of presence, remuneration not paid by or on behalf of a U.S. resident employer, and not borne by a U.S. PE. If the Italian company recharges the secondee's salary to the U.S. subsidiary, the U.S. entity is effectively bearing the cost and the exemption fails from day one. Business trips of a few weeks with no recharge usually qualify; a six-month secondment with full recharge usually does not.

Payroll models

With a shadow payroll, the employee is paid in Italy while a U.S. payroll remits federal and state withholding on the U.S.-taxable part and issues a W-2. With a split payroll, part of the salary is paid in dollars. Any employer paying wages for U.S. services, including a foreign one, must generally withhold unless an exemption such as Art. 15 applies.

Tax equalization and tax protection

Under tax equalization the secondee bears a hypothetical tax (roughly what they would pay in Italy) and the company pays the actual U.S. and Italian taxes. Under tax protection the company reimburses only the excess over the home tax. Company-paid taxes are themselves taxable income, so gross-ups compound.

Individual tax residency in the U.S. and in Italy

U.S. residency: green card and substantial presence

A non-U.S. citizen is a U.S. tax resident if they hold a green card or meet the substantial presence test: at least 31 days in the current year and at least 183 days counting all days this year, one third of last year's days and one sixth of the days the year before. Days in certain visa categories (some students, teachers and trainees) are excluded. Residents are taxed on worldwide income.

In the arrival and departure years the person is usually dual-status (no standard deduction or joint filing unless a married couple elects full-year residency). A first-year election, Form 8840 (closer connection) or the Art. 4 tie-breaker with Form 8833 can change the result in specific cases.

State residency

New York, New Jersey and Massachusetts treat someone as a "statutory resident" if they keep a permanent place of abode and spend more than 183 days in the state. California presumes residency after more than nine months in a tax year. New York City adds its own income tax. Texas and Florida have no personal income tax, which changes the cost of an expatriate package.

Italian residency after Legislative Decree 209/2023

From 2024 the new art. 2 TUIR makes a person Italian tax resident if, for most of the tax year (183 days, 184 in a leap year, counting fractions of a day), they have in Italy their civil-law residence, their domicile (now the place where personal and family relationships mainly develop) or simply their physical presence. Registration in the anagrafe is only a rebuttable presumption. Agenzia delle Entrate Circular 20/E of November 4, 2024 explains the criteria.

Italian citizens moving abroad for more than 12 months must register with AIRE through the consulate. AIRE is necessary but not sufficient: a secondee whose family stays in Italy may remain Italian resident through domicile and be taxed on worldwide income in Italy.

Regime impatriati (from 2024)

Art. 5 of Legislative Decree 209/2023 replaced the old "rientro dei cervelli" regime for people moving tax residency to Italy from 2024. 50% of employment and self-employment income produced in Italy is exempt (60% if moving with a minor child, or if a child is born or adopted during the period), up to €600,000 of income per year, for five years. Requirements: non-residency for the previous three tax years (six if the person works in Italy for the same employer or group they worked for abroad; seven if they had also worked in Italy for that group before leaving), a commitment to stay resident for four years (otherwise the benefit is recovered with interest), high qualification or specialization, and work performed mainly in Italy. This matters when you bring a U.S. hire or a returning manager to headquarters.

Foreign tax credit

When both countries tax the same wages (typical for a secondee who remains Italian resident and spends more than 183 days in the U.S.), the U.S. taxes U.S. workdays first and Italy gives a credit under art. 165 TUIR, limited to the Italian tax on that income and available once the U.S. tax is final. The foreign earned income exclusion ($132,900 for 2026) applies only to U.S. citizens and residents living abroad, not to Italians working in the U.S.

The U.S. subsidiary: filings, withholding on payments to Italy, transfer pricing

Federal filings

• Form 1120: annual return for a C corporation (21% federal rate), due April 15 for calendar years, extendable six months with Form 7004.
• Form 5472: required from a U.S. corporation at least 25% foreign-owned, for each related party with reportable transactions (salary recharges, loans, royalties, management fees, capital contributions). A foreign-owned single-member LLC must file a pro forma 1120 with Form 5472 even with no income. Penalty: $25,000 per form per year, plus $25,000 for each 30 days of continued failure after IRS notice.
• Payroll: Forms 941, 940, W-2 and state equivalents. See payroll.

FinCEN's March 2025 interim final rule narrowed Corporate Transparency Act (BOI) reporting to foreign companies registered to do business in a state; U.S.-formed companies are currently exempt. Verify current status.

Withholding on payments to Italy and Form W-8BEN-E

U.S. payers withhold 30% on dividends, interest and royalties paid to foreign persons unless a treaty reduces the rate. To obtain treaty rates, the Italian parent provides Form W-8BEN-E, claiming benefits in Part III and naming the LOB test it meets; it is valid until the end of the third calendar year after signing. The payer reports on Form 1042-S and files Form 1042 by March 15. In Italy, dividends from a U.S. subsidiary are 95% exempt for an IRES taxpayer (art. 89 TUIR), so the credit for U.S. withholding is limited.

Transfer pricing for cost recharges

Every intercompany flow must be at arm's length under IRC section 482, treaty Art. 9 and art. 110, comma 7 TUIR: secondee recharges, management and IT services (the U.S. services cost method allows certain low-value services at cost), royalties and distribution margins. Document with an intercompany agreement signed before flows start, a U.S. transfer pricing study (protection against 20% to 40% penalties under section 6662(e)) and the Italian masterfile and documentazione nazionale.

In flux: the retaliatory "Section 899" tax proposed in 2025 was dropped from the final One Big Beautiful Bill Act. Groups with consolidated revenue of €750 million or more are subject to Italy's Pillar Two minimum tax, also introduced by Legislative Decree 209/2023; follow how the OECD "side-by-side" arrangement evolves.

Equity and bonuses paid by the Italian parent to U.S. staff

When U.S. managers join the parent's stock option, performance share or phantom plan, or receive a group bonus from Italy, U.S. rules apply, not the plan's Italian design:

• Nonqualified stock options: the spread at exercise is wage income, subject to withholding and FICA through U.S. payroll.
• Incentive stock options: possible only if the plan meets section 422 (shareholder approval, exercise price at least fair market value, $100,000 annual vesting limit). Italian plans are rarely designed that way.
• RSUs and performance shares: taxable as wages at vesting or delivery.
• Discounted options and deferred bonuses: may fall under section 409A, with a 20% additional tax if not compliant.

Even if the parent pays or delivers, the U.S. employer must report on the W-2 and withhold. Supplemental wages are withheld at 22% federal (37% above $1 million), plus state. For mobile employees, equity income is sourced by workdays over the grant-to-vest period, so a secondee may owe tax in both countries with a credit. On the securities side, the parent usually relies on Rule 701 or Form S-8 to offer shares to U.S. employees. See compensation.

FBAR, FATCA, quadro RW and IVAFE

Secondees often hold accounts in both countries. Penalties are severe even when no tax is due.

• FBAR (FinCEN Form 114): any U.S. person (including residents under the substantial presence test) with a financial interest in or signature authority over foreign accounts whose aggregate value exceeded $10,000 at any time in the year. Due April 15, automatic extension to October 15. A U.S. employee who can sign on the parent's Italian bank account may have to file.
• FATCA Form 8938: for U.S.-resident single filers, foreign financial assets above $50,000 at year end or $75,000 at any time; $100,000 and $150,000 for joint filers.
• Quadro RW: Italian residents report foreign financial assets and property (U.S. accounts, 401(k) balances, U.S. equity awards) in their tax return.
• IVAFE: 0.2% per year on foreign financial assets (0.4% for listed non-cooperative jurisdictions since 2024); bank accounts pay a fixed €34.20. IVIE applies to foreign real estate.

Practical guides

Frequently asked questions