Italy 100k Flat Tax vs UK Non-Dom (FIG): 2026 HNW Guide

For HNW individuals weighing Italy against the UK in 2026, the two regimes now solve fundamentally different problems. Italy sells a long, fixed, expensive certainty — €300,000 per year for up to 15 years on all foreign-source income, applicable to new residents from 1 January 2026. The UK sells a short, free, narrow shield — the Foreign Income and Gains (FIG) regime, which exempts qualifying foreign income and gains for four years and then drops the taxpayer onto full arising-basis worldwide taxation. Neither is a straight replacement for the old UK non-dom rule, and Italy's regime is roughly three times the price it was when the "€100K flat tax" nickname first caught on.

The 2025–2026 headline shift

Two policy changes reset this comparison. The UK's remittance basis, which allowed long-term non-domiciled residents to keep foreign income and gains outside UK tax as long as they were not brought onshore, was abolished on 6 April 2025. It was replaced by the FIG regime, which is time-limited rather than domicile-linked. In parallel, Italy's flat-tax regime for new residents — introduced at €100,000 per year, then doubled to €200,000 in August 2024, and further raised to €300,000 for new applicants under the 2026 Budget Law — is now materially more expensive than the number that gave the regime its shorthand name.

Grandfathering is asymmetric. Anyone who opted into Italy's regime before August 2024 continues at €100,000 per year. Those who elected between August 2024 and the end of 2025 continue at €200,000. Only new applicants transferring residency from 2026 onward pay the €300,000 rate. On the UK side, former remittance-basis users are offered a separate Temporary Repatriation Facility (TRF): a chance to designate pre-6 April 2025 unremitted foreign income and gains at 12% during the 2025–26 and 2026–27 tax years, then 15% for 2027–28, before the three-year window closes.

How each regime actually works

Italy: €300,000 substitute tax

Italy's HNWI flat tax is not a rate — it is a substitute tax. In exchange for a fixed annual payment of €300,000 (for new 2026 opt-ins), Italy waives ordinary income tax on foreign-source income of all kinds: employment income earned abroad, dividends, interest, capital gains on foreign assets, rental income on non-Italian property, business income earned outside Italy. It also switches off the IVIE (0.76%) wealth tax on foreign real estate and the IVAFE (0.2%) wealth tax on foreign financial assets for the electing individual, and disapplies the ordinary foreign-asset reporting obligations for those holdings. Italian-source income remains taxable under the ordinary progressive schedule (23–43% plus regional and municipal surcharges).

The regime is elected on the first Italian tax return after moving and applies for up to 15 tax years. It can be revoked at any time, but it cannot be re-entered once revoked. Capital gains realised on qualifying shareholdings in foreign companies during the first five years of the regime are explicitly excluded from the flat tax and taxed at ordinary rates — the main technical carve-out that catches clients unaware.

UK: four-year FIG exemption

The FIG regime is structured completely differently. It is not a lump sum; it is a claim-by-claim exemption. A qualifying new UK resident can elect, each year, to exclude qualifying foreign income and gains from UK taxation for up to four UK tax years from the date of arrival. The trade-off HMRC extracts is loss of the personal allowance and CGT annual exempt amount in any year the election is made, plus disqualification from certain reliefs. After year four, the individual falls onto full worldwide arising-basis taxation: 45% top marginal rate on income (England and NI), 24% CGT on residential property, 18–24% on other gains, and dividend rates up to 39.35%.

Unlike the old remittance basis, FIG has no ongoing offshore-versus-remitted distinction. Foreign income and gains earned during the four-year window can be brought into the UK freely once claimed. Functionally, FIG is a short front-loaded relief for taxpayers who plan to spend four years accumulating overseas before settling in the UK on a full-tax footing.

Break-even income levels

The right way to compare the two regimes is to model each against the counter-factual of paying ordinary tax on foreign income in the same jurisdiction. For Italy, the arithmetic is direct: at what level of foreign income does €300,000 of substitute tax beat Italy's 43% top marginal plus surcharges? Assuming a combined effective top marginal of roughly 45% on ordinary income (top IRPEF plus average regional and municipal surcharges — verify with a local adviser, as regional bands vary), the pivot sits around €670,000 to €700,000 of annual foreign income. Below that, ordinary Italian taxation on the same income costs less than the lump sum.

Two adjustments push the break-even lower. First, the flat tax also waives IVAFE at 0.2% and IVIE at 0.76% on foreign holdings — so a taxpayer with, for example, €15 million of foreign financial assets shelters roughly €30,000 of IVAFE per year, and a similar-sized foreign real-estate portfolio shelters materially more. Second, the flat tax insulates foreign capital gains from Italy's 26% flat rate on investment income; a client who realises €2 million in gains in a given year effectively saves €520,000 of Italian tax that year alone.

These are illustrative and rounded — the actual number depends on the region of residence, the mix of employment versus investment income, and the timing of realisations. Regional and municipal surcharges alone can swing the effective rate by roughly two percentage points. As of 2026, every serious comparison should be modelled on the specific fact pattern rather than a template.

For the UK FIG regime, the comparison is not a break-even number — it is a horizon question. FIG has no fee, but its four-year cap is a hard limit. On a €1 million foreign income base, four years of FIG shelter is worth roughly £1.6 million in avoided UK tax at a blended 40% average — but only for those four years. Italy's €300,000 flat tax, for the same taxpayer, costs €1.2 million over four years and continues to cover them for another eleven. The UK regime is cheaper if the horizon is short; Italy is cheaper if the horizon is long.

Family members and dependants

Italy's regime allows the taxpayer to extend the flat tax to family members — spouse, civil partner, children, parents, and other qualifying relatives — for an additional €50,000 per person per year under the 2026 rules. Each additional family member pays their own €50,000 substitute tax and receives the same waiver of foreign income tax, IVIE and IVAFE. A family of four with two adult earners can therefore shelter foreign income for all four heads under a combined annual cost of €450,000 (€300,000 + three × €50,000). The €50,000 add-on is up from €25,000 under the pre-2026 rules — it doubled alongside the primary rate hike.

The UK FIG regime has no family extension mechanism. Each individual claims (or does not claim) FIG on their own return, and each must independently meet the ten-year non-residence eligibility test. Married couples cannot pool the relief; a UK-resident spouse who was resident within the last ten years is barred from FIG regardless of the other partner's status.

The disqualifiers

Both regimes are gated by prior-residence tests, and this is where planning most often breaks down.

Italy requires the applicant to not have been an Italian tax resident for at least 9 of the prior 10 tax years. Anyone with a recent Italian residence history — including for study or work — is barred. A family member can be added to the primary election only if that family member independently satisfies the same nine-of-ten test.

The UK is stricter: FIG is available only to those who have been non-UK resident for at least 10 consecutive UK tax years immediately before returning. A single year of UK residence inside that ten-year window disqualifies the taxpayer for the full four-year FIG entitlement. This is a materially higher bar than the old non-dom rules — historic non-doms who kept a UK footprint through short visits cannot simply transition into FIG.

Other disqualifiers to flag with a specialist adviser: Italy's regime excludes gains on foreign qualifying shareholdings realised in the first five years; the UK requires an explicit annual claim on the self-assessment return; and both regimes interact with the applicant's home-country CFC, exit-tax and treaty-tie-breaker rules in ways that materially affect the actual outcome. A US citizen, for instance, remains liable to US worldwide taxation regardless of whether they claim Italian flat tax or UK FIG.

Inheritance tax: the sleeper issue

For HNW clients, inheritance tax often drives the choice more than income tax. The 2025 UK reforms shifted IHT from a domicile-based test to a residence-based one: an individual who has been UK-resident in 10 of the last 20 UK tax years is treated as a "long-term resident", and their worldwide estate becomes exposed to UK IHT at 40% above the £325,000 nil-rate band. The old non-dom shelter for foreign-situs assets no longer applies once long-term residence is triggered, and a ten-year "tail" continues to bite after leaving the UK.

Italy taxes inheritances and gifts at 4–8% with generous close-family exemptions, and the €300,000 flat-tax election disapplies Italian inheritance and gift tax on foreign-situs assets during the regime. For a €50 million estate held largely in foreign structures, the delta between UK 40% exposure and Italy 4–8% (or effectively 0% on foreign assets under the regime) is decisive in isolation. It is the single largest reason UK-based HNW families were modelling relocation into 2026.

Structural trade-offs

The regimes are not interchangeable in kind. FIG buys four years of full shelter at zero cost, with a hard cliff at year five. Italy's regime buys up to fifteen years of shelter at a heavy fixed cost, with pricing insensitive to income size above the break-even. Broadly, Italy suits the settled multi-decade relocation with large annual foreign income and substantial wealth-tax exposure. The UK FIG works for a shorter-horizon return — an entrepreneur planning to sell a foreign business within four years, or a professional cycling through a UK posting — provided the ten-year prior-non-residence gate is clean.

The decision also turns on non-tax factors that this analysis deliberately does not price: cost of living, healthcare, schooling, banking access, treaty positions relative to a third country of citizenship, and how each regime interacts with a US citizen's continuing IRS obligations. The tax calculus is a necessary condition, not a sufficient one, and any residency election should be structured through advisers licensed in both jurisdictions.

Where to go next

For deeper reference on either regime, see the country pages for Italy and the United Kingdom. For the mechanics of triggering and severing residence, read how tax residency works and the complete guide to tax residency 2026. Longer-form treatments of each regime live at Italy's HNW flat tax and the UK non-dom abolition. Users comparing multiple jurisdictions side by side can use the compare tool, and common cross-border questions are answered in the TaxAtlas FAQ. Information here is analytical, not advice — every HNW residency election should be signed off by qualified tax counsel in both source and destination jurisdictions.