Inheritance lawyer in Donostia: Gipuzkoa foral regime and the 95% ISD allowance

Inheritances in Donostia-San Sebastian and the Historic Territory of Gipuzkoa are governed by Basque foral law, both in civil terms (Fuero Civil Vasco, Ley 5/2015 de Derecho Civil Vasco) and in tax terms (the Juntas Generales de Gipuzkoa hold exclusive regulatory authority over the Inheritance and Gift Tax). As in Bizkaia, the ISD in Gipuzkoa applies a 95% allowance for direct heirs, and the foral civil rules establish specific features such as troncalismo and the special succession rights of the surviving spouse. Processing an inheritance in Donostia without knowledge of these rules can lead to errors with significant economic and legal consequences.

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Why BM Consulting

Specialised advice and personal service

At BMC we are specialist inheritance lawyers in Donostia-San Sebastian with expertise in Gipuzkoa foral law and the tax rules of the Juntas Generales. We manage the complete process: succession documentation, asset inventory, partition deed respecting foral law, ISD self-assessment before the Diputacion Foral de Gipuzkoa, municipal capital gains tax at Donostia City Council and Land Registry registrations. For contested inheritances, we act before the Courts of First Instance of Donostia-San Sebastian.

  • In Gipuzkoa the ISD allowance for direct heirs is 95% — a highly favourable Basque foral regime.

  • The deadline to settle the tax is 6 months from the date of death, extendable by a further 6 months.

  • The Fuero Civil Vasco establishes distinct institutions

    troncalismo, a four-fifths legitima (legítima foral), and the cuarto viudal for the surviving spouse.

  • Fiscal authority rests with the Diputacion Foral de Gipuzkoa, not the national tax authority.

How we work

From first contact to case completion

  1. Initial documentation and foral analysis

    We obtain the death certificate, the certificate of last wills and the copy of the will from the Colegio Notarial del Pais Vasco (headquartered in Bilbao, with offices in Donostia). We analyse the civil domicile of the deceased (Basque foral or common law) to determine the applicable civil rules. If there is no will, we process the declaration of intestate heirs.

  2. Inventory and foral valuation

    We prepare the asset inventory in Gipuzkoa: properties in Donostia city (Parte Vieja, Gros, Ategorri, Igeldo), in metropolitan municipalities (Hernani, Errenteria, Lasarte) and in tourist areas (Zarautz, Zumaia, Hondarribia). We identify the foral ancestral assets (bienes troncales) that may be subject to troncalismo.

  3. Partition deed with foral rights

    We draft the partition deed respecting the foral legitima (legítima foral) of Gipuzkoa — four-fifths in favour of the children — the surviving spouse's cuarto viudal and the troncalismo rules over foral real estate. For immovable property, the partition is formalised in a public deed before a notary in Donostia.

  4. Settlement before the Diputacion Foral and registrations

    We file the ISD self-assessment before the Diputacion Foral de Gipuzkoa with the 95% allowance for direct heirs. We manage the municipal capital gains tax at Donostia City Council and process the Land Registry registrations.

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The problem

Inheritances in Donostia-San Sebastian and the Historic Territory of Gipuzkoa are governed by Basque foral law, both in civil terms (Fuero Civil Vasco, Ley 5/2015 de Derecho Civil Vasco) and in tax terms (the Juntas Generales de Gipuzkoa hold exclusive regulatory authority over the Inheritance and Gift Tax). As in Bizkaia, the ISD in Gipuzkoa applies a 95% allowance for direct heirs, and the foral civil rules establish specific features such as troncalismo and the special succession rights of the surviving spouse. Processing an inheritance in Donostia without knowledge of these rules can lead to errors with significant economic and legal consequences.

Our solution

At BMC we are specialist inheritance lawyers in Donostia-San Sebastian with expertise in Gipuzkoa foral law and the tax rules of the Juntas Generales. We manage the complete process: succession documentation, asset inventory, partition deed respecting foral law, ISD self-assessment before the Diputacion Foral de Gipuzkoa, municipal capital gains tax at Donostia City Council and Land Registry registrations. For contested inheritances, we act before the Courts of First Instance of Donostia-San Sebastian.

Process

How we do it

1

Initial documentation and foral analysis

We obtain the death certificate, the certificate of last wills and the copy of the will from the Colegio Notarial del Pais Vasco (headquartered in Bilbao, with offices in Donostia). We analyse the civil domicile of the deceased (Basque foral or common law) to determine the applicable civil rules. If there is no will, we process the declaration of intestate heirs.

2

Inventory and foral valuation

We prepare the asset inventory in Gipuzkoa: properties in Donostia city (Parte Vieja, Gros, Ategorri, Igeldo), in metropolitan municipalities (Hernani, Errenteria, Lasarte) and in tourist areas (Zarautz, Zumaia, Hondarribia). We identify the foral ancestral assets (bienes troncales) that may be subject to troncalismo.

3

Partition deed with foral rights

We draft the partition deed respecting the foral legitima (legítima foral) of Gipuzkoa — four-fifths in favour of the children — the surviving spouse's cuarto viudal and the troncalismo rules over foral real estate. For immovable property, the partition is formalised in a public deed before a notary in Donostia.

4

Settlement before the Diputacion Foral and registrations

We file the ISD self-assessment before the Diputacion Foral de Gipuzkoa with the 95% allowance for direct heirs. We manage the municipal capital gains tax at Donostia City Council and process the Land Registry registrations.

95%
ISD allowance for direct heirs in Gipuzkoa
6 months
Deadline to settle the inheritance tax
Diputacion Foral
Competent authority in Gipuzkoa

My mother owned a flat in Gros and an account at Kutxabank. We had no knowledge of Basque foral law or how to process the inheritance with the Diputacion Foral. BMC explained the entire process, correctly applied the 95% foral allowance and resolved the inheritance on time. A highly competent inheritance practice.

Mikel Etxeberria Heir and industrial engineer, Donostia-San Sebastian

Inheritances in Donostia-San Sebastian: Gipuzkoa foral law

Donostia-San Sebastian, capital of the Historic Territory of Gipuzkoa, is governed by the same Basque foral rules that apply in Bilbao for succession matters. The Fuero Civil Vasco (Ley 5/2015 de Derecho Civil Vasco) and the tax rules of the Juntas Generales de Gipuzkoa establish a specific legal framework for inheritances that differs from the national Civil Code and from the tax regime of common-law autonomous communities.

The 95% allowance on the Inheritance and Gift Tax (ISD) for direct heirs, the foral legitima of four-fifths in favour of the children (with full freedom to distribute that share among them), the surviving spouse’s cuarto viudal and the troncalismo rules over foral real estate are the principal institutions that any inheritance lawyer in Donostia must master in order to process an inheritance in Gipuzkoa correctly.

At BMC we are inheritance lawyers in Donostia with experience before the Diputacion Foral de Gipuzkoa, the city’s Land Registries and the Courts of First Instance of Donostia-San Sebastian.

Inheritance Tax in Gipuzkoa: the foral regime and the 95% allowance

The Juntas Generales de Gipuzkoa hold exclusive regulatory authority over the Inheritance and Gift Tax in the Historic Territory. The current rules, set out in Norma Foral 3/1990 de Gipuzkoa and subsequent amendments, establish:

  • 95% allowance on the gross liability for spouses, descendants and ascendants (Groups I and II).
  • 50% allowance for siblings and Group III collateral relatives.
  • No special allowance for Group IV heirs.
  • Additional reliefs for acquisition of a family business (up to 95%), for disability and for transfer of the habitual residence.

Jurisdiction to settle ISD in Gipuzkoa lies with the Diputacion Foral de Gipuzkoa, with offices in Donostia-San Sebastian and throughout the province. Declarations may be filed electronically with a digital certificate.

The Gipuzkoa foral legitima: four-fifths with freedom of improvement

One of the most significant differences between Basque foral law and the national Civil Code in succession matters is the configuration of the legitima (forced heirship entitlement). Whereas under common law the strict legitima is one third of the estate, distributed equally among all children, under the Fuero Civil Vasco the legitima is four-fifths of the hereditary estate, but the testator retains full freedom to distribute that share among the children as considered appropriate. This means:

  • The testator may leave everything to one of the children, subject only to the condition that the total amount left to the children is not less than four-fifths.
  • The testator may not dispose of more than one-fifth of the estate outside the children or descendants (whereas under common law the free-disposal third may be distributed without restriction).

This flexibility in distributing the legitima among children is a powerful tool for succession planning involving family businesses or estates requiring unified management.

The cuarto viudal in Gipuzkoa

The surviving spouse in the Basque Country is not a forced heir (does not hold an entitlement to the legitima), but does have a right to the cuarto viudal (spousal quarter): one quarter of the net hereditary estate in usufruct, provided the surviving spouse lacks sufficient assets to cover their needs and concurs with children or other heirs of the deceased. This right is calculated on the net estate (assets minus liabilities) and may be highly significant in high-value estates.

The cuarto viudal is independent of any rights the deceased may have conferred on the spouse by will. If the testator has appointed the spouse as universal heir or has left a sufficient legacy, the spouse has no further entitlement to the cuarto viudal.

Inheritance disputes in Donostia: the property market and family businesses

Donostia-San Sebastian has one of the most expensive property markets in Spain. Flats in the Parte Vieja, Gros, Ategorrieta, Igeldo or the farmhouses (caserios) on the outskirts of the city can reach very high prices, generating disputes when heirs cannot agree on whether to sell or retain an asset. The main sources of conflict in Donostia inheritances are:

Caserios and rural estates with heritage value: The caserío (baserri) is an institution with deep cultural roots in the Basque Country. Many Donostia estates include a family caserío that the deceased wishes to pass to a single heir in order to preserve its integrity. Basque foral law, with its freedom of improvement between children, facilitates this transfer without the disputes that would arise under common law. However, other heirs may consider that the valuation of the caserío does not reflect its true market value, generating disputes about the amount of the legitima.

Industrial and technology companies: Gipuzkoa’s business fabric is one of the most dynamic in the Basque Country: metalworking, automotive, technology, cooperativism (Mondragon). Inheritances involving shareholdings in such companies require specialist valuations and careful management of the 95% foral ISD relief for family businesses.

High-value flats in El Antiguo or Igeldo: The most valuable residential neighbourhoods in Donostia generate disputes when heirs have different financial needs or different emotional ties to the family home.

Processing the inheritance of a Donostia resident with assets in other provinces

It is common for a Donostia resident to hold assets in other provinces or territories: an apartment on the Cantabrian coast, a property in Madrid or real estate in southern Spain. In these cases, processing the inheritance involves settling ISD before two or more different tax authorities:

  • Assets in Gipuzkoa: ISD before the Diputacion Foral de Gipuzkoa, with the 95% allowance.
  • Assets in other common-law regions: ISD before the relevant regional tax authority, applying that region’s rules, which may be more or less favourable than the foral regime.
  • Assets abroad: Analysis of the tax rules of the country where the assets are situated and any applicable double-taxation treaties.

BMC manages the coordination of ISD settlements across different territories, avoiding duplications and ensuring the correct application of each authority’s rules. We also advise on the potential impact of the Gipuzkoa foral wealth tax when inherited assets exceed the taxable thresholds.

Succession planning in Donostia: making the most of foral law

The Fuero Civil Vasco offers more flexible succession planning tools than common law. The freedom to improve between children — within the four-fifths of the foral legitima — makes it possible to design wills that ensure continuity in family businesses, the integrity of the caserío or the transfer to the children most involved in managing the family estate.

At BMC we offer a succession planning service tailored to Gipuzkoa foral law, including estate analysis, identification of troncal assets, fiscal simulation of succession scenarios and design of the most efficient will for each family situation.

FAQ

Frequently asked questions

The Gipuzkoa foral rules establish a 95% allowance on the Inheritance and Gift Tax (ISD) for spouses, descendants and ascendants (Groups I and II). An inheritance between parents and children in Donostia is taxed at just 5% of the liability that would apply without the allowance. The Diputacion Foral de Gipuzkoa holds exclusive regulatory authority over this tax in the Historic Territory, so the rules applicable in Donostia differ from the national framework.
The deadline to file the self-assessment of the Impuesto de Sucesiones before the Diputacion Foral de Gipuzkoa is six months from the date of death, extendable by a further six months if requested before the initial deadline expires. Failure to comply results in surcharges and interest under Gipuzkoa foral rules.
Troncalismo is an institution of the Fuero Civil Vasco that applies to real estate situated within the infanzonado vizcaino. In Gipuzkoa, troncalismo has a more limited application than in Bizkaia, but certain assets are subject to the foral regime of each Historic Territory. The Ley 5/2015 de Derecho Civil Vasco establishes the rules for ancestral assets (bienes troncales), which must remain within the deceased's family line. At BMC we identify whether assets in a Donostia inheritance are subject to troncalismo and advise on its implications.
The heir may accept with benefit of inventory (liability limited to the inherited estate), accept unconditionally (personal liability extends to the heir's own assets) or renounce. Where known debts or uncertainty over liabilities exist, acceptance with benefit of inventory is the most prudent option. A renunciation before a notary is final.
If the deceased held Basque civil domicile and left no will, the intestate inheritance is governed by the Fuero Civil Vasco, with foral particularities regarding the order of heirs and troncal assets. The declaration of intestate heirs is processed before a competent notary in Donostia or any notary office across the country.
Yes. Non-resident heirs have the same tax obligations in relation to assets in Gipuzkoa. The ISD is settled before the Diputacion Foral de Gipuzkoa within six months, with the same foral allowances applicable to residents. BMC manages inheritances with non-resident heirs in Donostia.
The cost depends on complexity: foral and common-law assets, troncalismo, number of heirs and disputes. BMC offers a free initial consultation and a fixed fee for straightforward inheritances.

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Frequently asked questions

Questions about Inheritance Lawyer in Donostia-San Sebastian

The Gipuzkoa foral rules establish a 95% allowance on the Inheritance and Gift Tax (ISD) for spouses, descendants and ascendants (Groups I and II). An inheritance between parents and children in Donostia is taxed at just 5% of the liability that would apply without the allowance. The Diputacion Foral de Gipuzkoa holds exclusive regulatory authority over this tax in the Historic Territory, so the rules applicable in Donostia differ from the national framework.
The deadline to file the self-assessment of the Impuesto de Sucesiones before the Diputacion Foral de Gipuzkoa is six months from the date of death, extendable by a further six months if requested before the initial deadline expires. Failure to comply results in surcharges and interest under Gipuzkoa foral rules.
Troncalismo is an institution of the Fuero Civil Vasco that applies to real estate situated within the infanzonado vizcaino. In Gipuzkoa, troncalismo has a more limited application than in Bizkaia, but certain assets are subject to the foral regime of each Historic Territory. The Ley 5/2015 de Derecho Civil Vasco establishes the rules for ancestral assets (bienes troncales), which must remain within the deceased's family line. At BMC we identify whether assets in a Donostia inheritance are subject to troncalismo and advise on its implications.
The heir may accept with benefit of inventory (liability limited to the inherited estate), accept unconditionally (personal liability extends to the heir's own assets) or renounce. Where known debts or uncertainty over liabilities exist, acceptance with benefit of inventory is the most prudent option. A renunciation before a notary is final.
If the deceased held Basque civil domicile and left no will, the intestate inheritance is governed by the Fuero Civil Vasco, with foral particularities regarding the order of heirs and troncal assets. The declaration of intestate heirs is processed before a competent notary in Donostia or any notary office across the country.
Yes. Non-resident heirs have the same tax obligations in relation to assets in Gipuzkoa. The ISD is settled before the Diputacion Foral de Gipuzkoa within six months, with the same foral allowances applicable to residents. BMC manages inheritances with non-resident heirs in Donostia.
The cost depends on complexity: foral and common-law assets, troncalismo, number of heirs and disputes. BMC offers a free initial consultation and a fixed fee for straightforward inheritances.
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