Quick overview. The Portuguese tax authority (AT) confirms, in Ficha Doutrinária (Doctrinal Summary) Processo n.º 30493 (8 May 2026), that the sale of a quinhão hereditário, a heir’s undivided share in an inheritance that has been accepted but not yet partitioned, is not subject to IRS capital-gains tax, even where the undivided estate consists exclusively of one or more immovable properties. The gain does not constitute the “onerous alienation of real rights over immovable property” under Article 10(1)(a) of the Portuguese IRS Code (CIRS) and is therefore not reportable on the Modelo 3.
For foreign heirs holding undivided shares in Portuguese estates, particularly families managing cross-border succession where one or more co-heirs wish to exit without forcing partition, this confirms a planning route that, until 2025, had been treated by the AT as fully taxable. This note sets out what the Doctrinal Summary says, the binding Supreme Administrative Court (STA) judgment behind it, the practical conditions that must be met for the regime to apply, and how the result interacts with the parallel rule on inherited property sold after partition.
The legal background: STA judgment 7/2025
The position confirmed in Ficha Doutrinária n.º 30493 follows the binding case-law judgment of the Supreme Administrative Court (STA), Acórdão de Uniformização de Jurisprudência n.º 7/2025 of 29 April 2025 (Process 33/24.1BALSB), published in the Diário da República, 1st Series, n.º 107, of 4 June 2025. The STA held that:
“The alienation of a hereditary share [quinhão hereditário] does not constitute the ‘onerous alienation of real rights over immovable property’ within the meaning of Article 10(1)(a) of the IRS Code, with the result that any gains arising from such alienation are not subject to that tax.”
That judgment is binding uniformização de jurisprudência, it harmonises the interpretation across the Portuguese administrative courts and sets the position that the tax authority must adopt going forward. In accordance with Article 68-A(4) of the General Tax Law (LGT), the AT was required to revise its prior practice to conform with the STA’s reading, which it did through Ofício-Circulado n.º 20281/2025, of 25 July 2025. Doctrinal Summary n.º 30493 is the AT’s application of that revised position to a specific taxpayer enquiry.
What the AT now accepts
The AT’s revised position, as reflected in the Ofício-Circulado and reproduced in the Doctrinal Summary, is built on a precise legal distinction grounded in Article 2124 of the Portuguese Civil Code:
What a heir transmits, when selling a hereditary share, is the right to the inheritance, that is, the ideal quota-share that a successor holds in an undivided inheritance that has been accepted but not yet partitioned. The object of the sale is the universality of the goods and rights that compose the undivided estate, taken as a whole. It is not a sale of any individual right over any specific asset within the estate. The acquirer takes the legal position of the heir within the inheritance, with all the inherent rights, including the right to manage the estate and to demand its partition.
That legal characterisation has two consequences, which the AT now accepts plainly:
- First, because the object of the sale is the universal quinhão, not the underlying immovable property, the transaction does not fall within Article 10(1)(a) CIRS, which captures only the “onerous alienation of real rights over immovable property” (alienação onerosa de direitos reais sobre bens imóveis). The gain is therefore not a taxable capita-gain under Category G of the IRS (Personal Income Tax).
- Second, the result holds even if the undivided inheritance consists exclusively of one or more immovable properties. The composition of the estate does not change the legal nature of what is being sold. The seller is selling a position within an inheritance, not a portion of a building.
The Doctrinal Summary at issue confirms that, where these conditions are met, the gain “must not be declared on the Modelo 3.”
The critical conditions: what counts, and what does not
The AT’s position is not a general carve-out for inheritance-related sales. It applies only where the legal nature of the transaction is unambiguously the sale of the right to the inheritance or to the hereditary share, taken as a whole. The Ofício-Circulado states the rule expressly:
“This understanding applies only when it follows unambiguously from the public deed or similar document that what is being transmitted is the right of one or more heirs to the inheritance or to the hereditary share, as a whole.”
In practice, this turns on the drafting of the escritura pública (public deed or other constitutive instrument) that formalises the sale. The deed must:
- identify the object of the transaction as the right to the inheritance or the hereditary share;
- treat that right as a unitary whole, not as a bundle of fractional rights over specific assets;
- transfer the seller’s heir-position in the undivided estate to the acquirer, with the rights of estate management and demand-for-partition that accompany it.
Where the deed instead conveys a fractional right over a specific identified property within the estate, for instance, “one-third of the building at X address” rather than “the seller’s hereditary share in the estate of Y”, the transaction falls outside the AT’s revised position. It is then taxed as the sale of a real right over immovable property under Article 10(1)(a) of the Personal Income Tax Code (CIRS), with the consequent capital-gain computation, FIFO acquisition-cost rules, and Modelo 3 reporting.
The structural lesson, for both Portuguese and foreign clients, is that the IRS treatment of the sale is determined by the legal form chosen at the notary’s office. The same economic transaction, exiting an undivided estate against payment, can produce a fully taxable outcome or a fully non-taxable outcome depending on how the escritura is drafted.
The distinction from the sale of inherited property after partition
The Doctrinal Summary n.º 30493 position must be read alongside the AT’s separate position on the sale of property that has already been inherited and partitioned out to the heir as an individual asset. Those are two different regimes, and treating them as one is the most common error in cross-border estate planning.
When an heir sells the hereditary share itself, the undivided share in the inheritance taken as a whole, before partition, the gain is not subject to IRS, on the basis confirmed in this Doctrinal Summary.
When the inheritance has already been partitioned and the heir holds, individually, a specific immovable property that arrived through succession, any subsequent sale of that property by the heir is a sale of a real right over immovable property under Article 10(1)(a) CIRS. It is fully taxable as a capital-gain, with the acquisition date fixed at the date of death of the testator (under the AT’s longstanding position reaffirmed in Doctrinal Summary Processo n.º 30430 of 7 May 2026) and the acquisition cost fixed at the value used for Imposto do Selo or IMT at that date.
The planning conclusion is direct. Where the family expects a co-heir to exit, and the alternative is partition followed by a sale of the partitioned asset, the sale-of-quinhão structure can be materially more efficient, provided the deed is drafted to reflect the universal-share transaction and not a fractional sale of any specific property. The structuring choice has to be made before, not after, the escritura is signed.
Municipal Property Tax and Stamp Duty
A final point the Doctrinal Summary addresses, in negative form. The taxpayer who requested the binding information asked, additionally, what Municipal Property Tax (IMT) and Stamp Duty (Imposto do Selo) obligations the buyer of the hereditary share would face. The AT declined to answer that part of the question on the ground that the requesting party (the seller) lacked legitimacy to seek binding information on the buyer’s tax position. The buyer must request that separately.
In substance, the IMT and Imposto do Selo treatment of the acquirer of a hereditary share turns on a separate body of rules and is not addressed in this Doctrinal Summary. Any client contemplating either side of such a transaction, purchase or sale, should treat the buyer-side analysis as a separate work-stream, and obtain its own confirmation where the amounts involved warrant it.
Practical implications for foreign heirs and cross-border families
The Doctrinal Summary is most directly relevant in three client situations that MCS sees recurrently.
First, foreign heirs to a Portuguese estate, where one or more co-heirs are non-residents and one of them wishes to exit. The traditional route was partition followed by individual sale of the partitioned asset; the IRS consequence was a capital-gain computation on the full disposal value against the Imposto do Selo base at the testator’s date of death. The quinhão-sale route, properly documented, removes that personal income tax exposure entirely for the exiting co-heir.
Second, family buy-outs of an undivided estate, where the remaining co-heirs (often resident in Portugal) wish to consolidate the estate by acquiring the share of the departing heir (often resident abroad). Structuring the transaction as the sale of the quinhão rather than a fractional property sale is now the AT-confirmed route to keep the gain outside personal income tax for the seller.
Third, sales to third parties, investors, developers, neighbours, interested in acquiring an undivided position in an estate, typically as a step towards eventual partition or judicial action. Subject to civil-law constraints on the alienation of hereditary rights to non-heirs (including the preference rights of co-heirs under Article 2130 of the Civil Code), the structure works in the same way: the seller’s gain is not subject to personal income tax where the deed transfers the quinhão and not a specific property.
In all three situations, the structure depends on advance planning of the deed. The personal income tax outcome is not retrievable after the fact through reclassification.
Madeira angle
There is no Madeira regional variation in the IRS treatment of the sale of a hereditary share, Article 10 CIRS applies uniformly across the national territory. Two practical points are worth recording, however, for Madeira-based clients and for clients with Madeira-situated estates.
First, the quinhão-sale structure interacts with the Madeira regional personal income tax rate scale only where the seller, having concluded the escritura in the form required by the AT, would otherwise have been taxed at the regional rate on a property disposal. The point of the structure is that there is no personal income tax to apply at any rate; the regional scale is therefore not engaged. Where the seller relies on the structure, the gain falls outside the Modelo 3 (tax return) entirely.
Second, undivided Madeira estates are unusually frequent in MCS’s client book because of the regional pattern of family-owned coastal and interior property, quintas, terraced agricultural holdings, family houses passed down across generations without formal partition. Many of those estates remain undivided across two or three successions. The structure confirmed in Doctrinal Summary n.º 30493 is, for the first time, an AT-validated route to liquidate a position in such an estate without triggering IRS. For clients managing inherited Madeira property across multiple co-heirs, this is the most operationally useful tax development of the year so far.
Practical steps before signing the deed
The structure is robust only if the deed is robust. The internal review work, where a client is contemplating the sale of a hereditary share, is straightforward and entirely front-loaded.
Confirm that the inheritance has been formally accepted but not yet partitioned. Where partition has already occurred, the quinhão-sale route is closed, and the transaction must be analysed as a sale of an individual immovable asset.
Confirm with the notary that the deed will identify the object of the transaction as the right to the inheritance or to the hereditary share taken as a whole, by reference to Article 2124 of the Civil Code, and not as a fractional sale of specific immovable assets within the estate. Vague or hybrid drafting is the principal risk; the AT’s position turns on the deed being unambiguous.
Confirm the position of co-heirs and any preference rights under Article 2130 of the Civil Code. The structure is a tax instrument; the civil-law architecture around the alienation of hereditary rights is a separate constraint and must be cleared before the deed is signed.
For non-resident sellers, confirm the interaction with the relevant Double Taxation Convention. In substance, because the gain is not subject to personal income tax in Portugal under the AT’s revised position, the treaty allocation question does not arise on the Portuguese side. However, the seller’s residence-state treatment of the gain remains a separate matter that must be analysed on its own footing.
Madeira Corporate Services can assist clients in structuring the sale of a hereditary share in a manner consistent with Doctrinal Summary n.º 30493 and Ofício-Circulado n.º 20281/2025, in coordinating with the notary on the form and content of the deed, and in advising on the parallel civil-law constraints. The work is scope-controlled and engagement-based, and is most useful when commissioned before the deed is drafted rather than after.
Frequently asked questions
What is a quinhão hereditário in Portuguese law?
A hereditary share is a heir’s undivided share in an inheritance that has been accepted but not yet partitioned. Under Article 2124 of the Portuguese Civil Code, it is the ideal quota-share that a successor holds in the universality of goods and rights that compose the estate, taken as a whole. The heir does not hold individual rights over specific assets within the estate until the partition is formalised.
Is the sale of a hereditary share subject to IRS in Portugal?
No. Following STA Acórdão de Uniformização de Jurisprudência n.º 7/2025 of 29 April 2025 and Ofício-Circulado n.º 20281/2025 of 25 July 2025, the AT confirms — most recently in Ficha Doutrinária Processo n.º 30493 (8 May 2026), that gains from the sale of a quinhão hereditário are not subject to IRS, even where the undivided estate consists exclusively of immovable property. The gain is not declared on the Modelo 3.
Does this rule apply when the undivided estate consists only of one or more properties?
Yes. The composition of the estate does not change the legal nature of what is being sold. What the heir transmits is the right to the inheritance, taken as a whole, not a fractional right over any specific property within it. The AT confirms this expressly in Ficha Doutrinária n.º 30493.
What must the escritura pública say for the IRS exemption to apply?
The deed must unambiguously identify the object of the transaction as the right to the inheritance or to the hereditary share, taken as a whole, by reference to Article 2124 of the Civil Code. It must not describe the sale as a fractional sale of specific immovable assets within the estate. Vague or hybrid drafting closes the route.
How is this different from selling property that I inherited after partition?
If the partition has already taken place and the heir holds a specific property as an individual asset, any sale of that property is the sale of a real right over immovable property under Article 10(1)(a) CIRS and is fully taxable as a capital-gain. The acquisition date is fixed at the date of death of the testator. The route confirmed in Ficha Doutrinária n.º 30493 applies only to the sale of the undivided share before partition.
Can the buyer of the hereditary share rely on this position for other taxes?
The Ficha Doutrinária does not address the buyer’s IMT and Imposto do Selo obligations and the AT declined to do so on the ground that only the buyer has legitimacy to seek binding information on the buyer’s position. Any buyer should obtain its own analysis before completing.
Does this affect heirs resident outside Portugal?
The Portuguese IRS treatment is the same. Because the gain is not subject to Portuguese personal income tax, the Double Taxation Convention allocation question does not arise on the Portuguese side. The residence-state treatment of the gain (including in the United Kingdom, the United States, Germany, France and other common origin jurisdictions for MCS clients) must be analysed separately under that state’s domestic rules.
This article is provided by Madeira Corporate Services for general information purposes only. It reflects the legal and administrative position as at the date of publication and does not take account of subsequent legislative, administrative or judicial developments. The content does not constitute legal, tax, accounting or other professional advice and must not be relied upon as a substitute for advice tailored to specific facts and circumstances. The application of the Portuguese IRS Code (CIRS), of the Portuguese Civil Code, of Acórdão de Uniformização de Jurisprudência n.º 7/2025 of the Supremo Tribunal Administrativo, of Ofício-Circulado n.º 20281/2025, of Ficha Doutrinária Processo n.º 30493 and of related instruments depends on the individual situation of each taxable person and on the specific drafting of the relevant public deed.
Readers should not act, or refrain from acting, on the basis of any information set out in this article without first obtaining professional advice. Madeira Corporate Services accepts no liability for any loss arising from reliance on the content of this article. Any engagement with Madeira Corporate Services is subject to a separate written engagement letter setting out the scope of work, the applicable terms and the relevant fee arrangements.
Miguel Pinto-Correia holds a Master Degree in International Economics and European Studies from ISEG – Lisbon School of Economics & Management and a Bachelor Degree in Economics from Nova School of Business and Economics. He is a permanent member of the Order of the Economists (Ordem dos Economistas)… Read more
