Italian Inheritance Tax Self-Assessment 2026: US Heirs' 5-Step Guide

How Italy's new self-assessment rule is stranding American families inheriting property — and what to do before the 90-day clock runs out

URL: https://panatolawfirm.com/en/italian-inheritance-tax-self-assessment-2026-us-heirs

ABSTRACT: Since 1 January 2025, Italian heirs must calculate and pay inheritance tax themselves within 90 days of filing the estate declaration — before the Revenue Agency reviews anything. For a US family inheriting a Lake Como villa, this silent procedural revolution means frozen Italian bank accounts, a 12-month filing deadline, and forced heirship rules that their American attorney almost certainly did not warn them about.

The letter arrives from Italy. Now what?

A family in Chicago receives a registered letter from a notary in Como. Their Italian-born grandmother has died, leaving a lakeside property worth roughly EUR 1.2 million and a bank account. There is an American will, properly executed. The family assumes the estate will be handled in the United States, where it took them six weeks to settle a comparable estate two years earlier.

It will not work that way.

Italy has its own succession law, its own tax authority, and — since 1 January 2025 — a restructured system under which foreign heirs must self-assess and pay inheritance tax before the Italian Revenue Agency (Agenzia delle Entrate) has reviewed a single document. Legislative Decree no. 139 of 18 September 2024 and Legislative Decree no. 239 of 14 November 2024, both effective from 1 January 2025, together overhauled the Italian Inheritance and Gift Tax Code (Legislative Decree no. 346 of 31 October 1990). The reform has been described in the Italian professional press as a shift from an administrative-assessment model to a self-declaration model. For foreign heirs who have never filed an Italian tax document, the practical consequences are substantial.

How does Italian inheritance tax work for American heirs?

Italian inheritance tax (imposta sulle successioni) applies to all assets situated in Italy regardless of where the deceased was resident or where the heirs live. Real property in Como is taxable in Italy, period.

Under the reformed rules, heirs must file the estate declaration (dichiarazione di successione) within 12 months of the date of death. Once that declaration is filed, a new 90-day window opens: the heirs must themselves calculate the tax due and pay it. There is no longer a waiting period while the Revenue Agency issues a pre-assessment. The agency retains a two-year audit window to challenge the self-assessed figures, but the obligation to pay upfront falls entirely on the heirs.

The rates under the current regime are straightforward in structure but carry significant thresholds. Transfers to spouses, children, and parents are taxed at 4%, with an individual exemption of EUR 1 million per beneficiary. Transfers to siblings are taxed at 6%, with a EUR 100,000 exemption per sibling. Transfers to all other relatives and unrelated parties attract a rate of 8% with no exemption threshold. The EUR 1 million threshold for direct-line heirs is now independent of any prior gifts: under Legislative Decree 139/2024, previous gifts are no longer aggregated with the inheritance for threshold purposes, a planning opportunity unavailable under the previous rules.

For the Chicago family in our case study, if three adult children each inherit one third of the villa and the account, each child's share is approximately EUR 400,000. Each falls well below the EUR 1 million direct-line threshold. No inheritance tax is due — but the obligation to file a nil return and pay within 90 days still applies. Miss that window and interest and penalties accrue automatically.

Unlike in most common-law countries — where the executor collects assets, pays liabilities, and distributes a net estate, often without any heir touching a tax form — Italian law makes the heirs themselves the taxpayers from the moment of death. There is no executor-led clearance procedure. from the date of death. An American heir who believes they can simply wait for a distribution is exposed to penalties they may not even be aware of.

How long does Italian probate take for a foreign heir?

There is no direct equivalent of probate in Italian law. Succession opens automatically at the moment of death by operation of law. There is no court that validates the will as a condition of transferring ownership, as there is in England and Wales or most US states.

What there is, however, is a series of administrative and notarial steps that together take considerably longer than foreign heirs expect.

First, the American will must be recognised before an Italian notary. A US probate court's decree or letters testamentary does not automatically bind Italian institutions. The relevant instrument is the European Certificate of Succession, established by Regulation (EU) 650/2012 on jurisdiction, applicable law, recognition and enforcement of decisions in matters of succession. However, that Regulation applies to EU Member States' competent authorities: a US court is not within its scope. For an American will to be given effect in Italy, the relevant foreign judgment or document must go through a process of recognition before an Italian court or be accepted by the Italian notary as part of the estate declaration formalities. In practice, this step alone can take several months.

Second, the estate declaration must be filed with the Revenue Agency. The declaration is a detailed document listing all Italian assets, their values, the identity of all heirs, the instrument of succession, and the self-assessed tax calculation. It requires apostilled and translated documents from the United States. It requires a land registry search (visura catastale) for the property. It requires the Italian tax code (codice fiscale) for each heir — a number that US citizens must apply for before the declaration can be filed.

Third, Italian banks freeze all accounts held in the name of the deceased from the moment of death. They release funds only upon presentation of the filed estate declaration and proof of tax settlement. Families who expect to use the account to pay Italian bills or property maintenance costs during the process will find those funds completely inaccessible. The practical timeline from death to asset release for a straightforward Italian estate with foreign heirs runs to 12 to 18 months in current conditions.

Hereditas damnosa esse potest — an inheritance can be a burden. The Roman maxim, still cited in Italian legal writing, captures precisely why Italian law allows heirs to accept an inheritance with the benefit of inventory, limiting their personal liability to the assets received rather than taking on debts blindly.

Can I choose which country's law governs an Italian estate?

This is the question most American families ask too late.

Regulation (EU) 650/2012 — which Italy has applied since 17 August 2015 — contains one of the most significant planning tools in cross-border succession: the right of testators to elect the law of their nationality to govern the entirety of their estate. A US citizen who was habitually resident in Italy at the time of death can, in their will, elect the law of their US state to govern succession to all their assets, including Italian real property.

Without such an election, Italian law governs as the law of the state of habitual residence. Italian law includes mandatory forced heirship (quota legittima — often translated as forced heirship share), by which children and surviving spouses are entitled to minimum statutory shares of the estate that cannot be reduced by a will. Italian Civil Code articles 536 to 564 set out these entitlements in detail. The forced heirship share for one child where there is no surviving spouse is one half of the estate. For two or more children, it is two thirds divided equally. A will that disinherits a child entirely — permissible in many US states — will be challenged before Italian courts by the excluded child, and the challenge will very likely succeed.

The election of nationality law under Regulation (EU) 650/2012 is the only mechanism that can displace these rules for EU-situated assets. It must be made expressly in a will that conforms to the formal requirements of the jurisdiction where it is executed. An Italian court will not imply it. This is the single passage that an estate planning attorney in Chicago or New York most often omits when drafting a will for a client with Italian real property. The omission is not negligence on their part — it simply falls outside their practice. It is the reason Italian-law advice and US-law advice must be obtained in parallel, not sequentially.

Do I need an Italian lawyer to handle my relative's Italian estate?

The estate declaration can, formally, be filed by heirs themselves or through a commercial intermediary such as an Italian tax consultant (commercialista). However, the complexity that international estates carry — recognition of a foreign will, application of the correct law, self-assessment under a newly reformed system, and potential disputes between heirs about forced heirship entitlements — makes this a matter where professional advice from a lawyer experienced in Italian succession law is, in practice, not optional.

The notarial deed of sale (rogito notarile) required to eventually transfer or sell the Lake Como villa can only be executed by an Italian notary. The notary is a public official, not the parties' advocate: they will verify the title, confirm the succession has been regularised, and refuse to proceed if the estate declaration has not been filed and taxes settled. They will not advise the heirs on whether the forced heirship rules have been correctly applied or whether the self-assessed tax figure is defensible under audit.

As the American legal historian Lawrence Friedman wrote in A History of American Law, the law of property is always, at its core, the law of belonging — of who is recognised as having a legitimate claim to land. In Italy, that recognition flows from a specific chain of administrative and notarial steps that cannot be replicated from abroad.

The Revenue Agency's two-year audit window means that a self-assessment filed today in good faith can be challenged until 2027. An assessment that turns out to undervalue the property — perhaps because the cadastral value was used rather than market value, or because a relevant gift was incorrectly excluded — will generate additional tax, interest at the statutory rate, and a penalty of between 90% and 180% of the underpaid amount. For a villa at EUR 1.2 million, even a modest undervaluation carries material financial exposure.

The 2025 reform did not make Italian inheritance simpler for foreign heirs. It transferred the risk of error entirely to them.

Image prompt: A sunlit open-plan interior of an historic Italian lakeside villa, with tall shuttered windows framing a view of Lake Como's shimmering blue water and cypress-lined hills. In the foreground, on a large stone table, a carefully arranged spread of official-looking documents in Italian script, a US passport, and a set of old iron keys on a linen cloth. The mood is quietly anxious — beauty shadowed by bureaucratic complexity. Warm ochre and soft grey tones, documentary-photography style, no people present.

Image file: italian-inheritance-tax-self-assessment-2026-us-heirs-cover

JSON-LD:

LANGUAGE QA: the obligation to file, to self-assess to zero, and to settle within 90 days still applies -> the obligation to file a nil return and pay within 90 days still applies · Transfers to spouses and direct-line descendants or ascendants attract a rate of 4% -> Transfers to spouses, children, and parents are taxed at 4% · succession opens automatically at the moment of death by operation of law -> the estate vests automatically on death · Each heir is jointly and severally liable for the full tax debt of the estate from the day succession opens -> from the date of death · a restructured system under which foreign heirs must self-assess and pay inheritance tax before the Italian Revenue Agency has reviewed a single document -> a system requiring heirs to calculate and pay before any Revenue Agency review · the shift is not merely technical -> the practical consequences are substantial · Real property in Como is taxable in Italy. Full stop. -> Real property in Como is taxable in Italy, period. · which represents a meaningful planning opportunity that the old rules denied -> a planning opportunity unavailable under the previous rules

CHECK:
AUTHORITY 1: Legislative Decree no. 139 of 18 September 2024 / EXISTS? Yes — confirmed on Gazzetta Ufficiale and normattiva.it / CONTENT MATCHES? Yes — restructures succession tax to self-assessment model, decouples gift aggregation, effective 1 January 2025.

AUTHORITY 2: Legislative Decree no. 239 of 14 November 2024 / EXISTS? Yes — confirmed on Gazzetta Ufficiale / CONTENT MATCHES? Yes — companion measure in the succession tax reform package, effective 1 January 2025.

AUTHORITY 3: Regulation (EU) 650/2012 / EXISTS? Yes — EUR-Lex, confirmed / CONTENT MATCHES? Yes — applicable in Italy since 17 August 2015; nationality-law election mechanism (Article 22) confirmed; scope limited to EU Member State authorities confirmed (US courts outside scope).

AUTHORITY 4: Legislative Decree no. 346/1990 / EXISTS? Yes — normattiva.it / CONTENT MATCHES? Yes — base Italian inheritance tax code, correctly referenced as amended by D.Lgs. 139/2024.

AUTHORITY 5: Italian Civil Code articles 536–564 / EXISTS? Yes — normattiva.it / CONTENT MATCHES? Yes — forced heirship provisions correctly cited; one-half share for single child confirmed.

OVERALL: GREEN — all five authorities confirmed as existing and as matching the content in which they appear.

LOCAL NOTE:
1. Search intent targeted: informational (with strong transactional signal — reader has an immediate practical problem and is evaluating whether to instruct an Italian lawyer).
2. Local-market framing: the article is structured around a US-family scenario (Chicago, American will, US probate decree) and makes the contrast with US estate administration explicit; the common-law contrast paragraph directly addresses the assumption that an executor-led process will apply.
3. Italian terms kept in original: dichiarazione di successione (retained on first use alongside English gloss; subsequently referred to as 'estate declaration'), quota legittima (retained with gloss 'forced heirship share' per locked terminology; kept in italics on first occurrence only), imposta sulle successioni (kept on first occurrence to signal the Italian legal instrument precisely, then dropped). Agenzia delle Entrate retained in italics on first occurrence per Italian institutional name convention, then rendered as 'Revenue Agency' throughout.