UK SIPPs, US IRAs and 401(k)s, ISAs, harmonised vs non-harmonised funds — how Italy taxes each one, and how to restructure before arrival to avoid costly mistakes.
You've decided to move to Italy. Your tax advisor has confirmed the flat tax works. But then comes the question that trips up even experienced wealth managers: what happens to your existing investment structures? The answer depends entirely on what you hold and where — and getting it wrong can cost hundreds of thousands in unnecessary tax.
This guide covers the most common financial structures held by HNWI relocating from the UK, US, UAE, and Switzerland, and how Italian tax law treats each one.
A UK Self-Invested Personal Pension (SIPP) is one of the most common structures held by UK HNWI. When you become an Italian tax resident, the treatment depends on whether you're under the flat tax regime and how you access the pension.
If your SIPP income is foreign-sourced (which it is — the pension is UK-based), it is covered by the €300,000 annual flat tax. This means drawdowns from your SIPP are included in the flat tax lump sum. You pay no additional Italian tax on these withdrawals, regardless of the amount.
The Italy-UK Double Tax Treaty (Article 18) allocates pension taxation to the state of residence — Italy. However, HMRC typically applies 25% tax-free on the first withdrawal and progressive rates on the rest, unless you claim treaty relief. Filing a DT-Individual form with HMRC is essential to avoid double taxation.
Critical: Do NOT transfer your SIPP to a QROPS without expert advice. QROPS transfers trigger a 25% overseas transfer charge unless the receiving scheme is in the same country as your residence. There are very few Italian-qualifying QROPS. In most cases, leaving the SIPP in the UK and drawing down under treaty protection is the correct strategy.
US citizens and green card holders face unique challenges because the US taxes worldwide income regardless of residence. Moving to Italy means navigating two complete tax systems simultaneously.
| Structure | Italian Treatment (Flat Tax) | US Treatment | Key Risk |
|---|---|---|---|
| Traditional IRA / 401(k) | Foreign income — covered by flat tax | Taxed on distribution at ordinary rates | Must file both Italian and US returns. Foreign tax credits critical. |
| Roth IRA | Italy may not recognise tax-free status | Tax-free distributions (if qualified) | Italy may tax Roth distributions as ordinary income. Treaty does not explicitly address Roth. |
| US Brokerage (stocks, ETFs) | Under flat tax if foreign-sourced | Subject to US capital gains rules | PFIC rules apply to non-US funds held by US persons — punitive tax. |
US citizens cannot use the Italian flat tax regime. The US-Italy treaty and FATCA requirements mean US citizens in Italy need specialised cross-border CPAs, not generic Italian commercialisti. Budget €10,000-€20,000/year for proper compliance.
ISAs (Individual Savings Accounts) lose their tax-free wrapper the moment you leave the UK. You cannot contribute to an ISA as a non-UK resident, and while the underlying investments remain, any gains realised after departure are subject to your new country's tax rules.
Under the Italian flat tax, gains from ISA holdings are foreign-sourced and covered by the €300,000 lump sum. However, if you're NOT under the flat tax (e.g., after the 15-year period), gains would be taxed at Italy's 26% capital gains rate. Strategy: consider crystallising gains before departure or during the flat tax period.
This is the single most important portfolio decision for anyone moving to Italy outside the flat tax regime. Italian tax law distinguishes sharply between:
| Fund Type | Italian Tax Rate | Examples | Reporting |
|---|---|---|---|
| Harmonised (UCITS/OICR) | 26% on gains | Irish-domiciled ETFs, Luxembourg SICAV, most European mutual funds | Imposta sostitutiva — simple withholding |
| Non-harmonised | Up to 43% (progressive IRPEF) | US-domiciled ETFs (Vanguard, iShares US), Cayman funds, some UK OEICs | Redditi diversi — complex annual reporting |
The difference is dramatic: a €1M gain on a non-harmonised fund could cost €430,000 in tax, versus €260,000 on a harmonised equivalent. For flat tax residents, this distinction doesn't matter (all foreign income is covered). But for post-flat-tax life, portfolio restructuring is essential.
Action required: Before relocating, work with your wealth manager to move from US-domiciled ETFs to their Irish or Luxembourg equivalents. An iShares S&P 500 ETF domiciled in Ireland (CSPX) is taxed at 26%. The same fund domiciled in the US (IVV) faces up to 43%. Same underlying exposure, radically different tax treatment.
Italian-compliant life insurance wrappers (polizze vita) are one of the most powerful tools for HNWI. They offer tax deferral on investment gains, favourable inheritance treatment (proceeds bypass Italian succession rules and are largely exempt from inheritance tax), and portfolio flexibility. Many private banks in Milan offer these as standard for international clients.
No. The flat tax covers all foreign investment income for 15 years. The restructuring is for post-flat-tax life, or for structures (like US IRAs) that have complexities regardless of the flat tax.
It depends on MiFID II cross-border rules. Many UK managers can continue servicing existing clients, but some cannot onboard 'new' EU residents post-Brexit. Your Italian private bank can typically manage the portfolio domestically with equivalent or better terms.
Italy taxes crypto at 26% on gains exceeding €2,000/year (as of 2026). Under the flat tax, crypto income from foreign wallets/exchanges is foreign-sourced and covered. Italian-exchange crypto is Italian-sourced and taxed at 26%.
Disclaimer: This guide provides general information as of April 2026. Financial regulations and tax laws change. Always consult qualified professionals for your specific situation. The Italian Gateway coordinates between your existing advisors and Italian professionals.