The planning of the Inheritance and Gift Tax (ISD) in Spain has become fertile ground for tax optimization, particularly due to the marked differences in regional bonuses. In our daily practice, we observe how these disparities can significantly impact the tax burden faced by heirs. In this article, we will break down the bonuses in various autonomous communities, strategies to optimize tax savings, and the inherent risks of tax fraud in the context of tax residence.
Communities with Zero Rate
Madrid, Andalusia, and the Canary Islands are paradigm examples of communities that have opted for 99% bonuses on ISD for 'mortis causa' acquisitions. This policy has been interpreted as a clear attempt to attract taxpayers from other regions, generating a fiscal competition that, while legitimate, has sparked controversies. The regional regulations, in these cases, allow heirs from groups I and II (descendants, ascendants, and spouses) to benefit from an almost negligible tax burden.
In Madrid, for example, Law 3/2020, of November 27, establishes this bonus, placing it among the most attractive in the country. However, these tax advantages are not without criticism, as they can lead to interregional inequalities and tensions with the principle of financial sufficiency of the autonomous communities.
Reductions by Kinship in Catalonia, Galicia, and the Basque Country
Catalonia, Galicia, and the Basque Country offer a different approach by applying significant reductions to the taxable base of the ISD, rather than direct bonuses. This method focuses on reducing the taxable base according to the degree of kinship, which can be more beneficial in high-value inheritances, where a percentage reduction has a considerable impact.
In Catalonia, Law 19/2010, of June 7, allows reductions that vary according to the degree of kinship, reaching up to 99% in some cases for direct descendants. In Galicia, reductions of 95% are applied for the first 400,000 euros inherited by descendants and spouses. These systems seek a balance between revenue collection and tax relief, although they can complicate succession planning due to the need to accurately value the involved assets.
Intermediate Regulation: Counterpoints and Considerations
Communities such as Castilla y León or Aragón present an intermediate approach, with less aggressive bonuses and reductions. These regions have opted for a fiscal policy that attempts to balance competitiveness with financial sufficiency, applying bonuses that range between 60% and 80%.
This type of regulation poses specific challenges in planning, as the strategy must consider both the value of the estate and the family structure of the deceased. Additionally, pending legislative reforms for 2026 could modify these percentages, requiring constant updates from advisors.
Tax Residence Planning and Risk of Tax Fraud
The choice of the deceased's tax residence is a crucial aspect of ISD planning. Since the residence determines the applicable regional regulations, some taxpayers consider changing their residence to benefit from more favorable taxation. However, this practice must be managed carefully to avoid tax fraud.
The jurisprudence of the Supreme Court (for example, STS 3823/2019) has established that the change of residence must be real and effective, not merely formal. This implies the need to demonstrate a genuine relocation of the center of personal and economic interests, which may be scrutinized by the Tax Administration.
- Verify the effective residence of the deceased.
- Ensure the correct valuation of the assets.
- Stay updated on pending legislative reforms.
Common Litigious Aspects
One of the most common issues we face in practice is the challenge of the tax residence by the Administration. Alleging tax fraud can lead to prolonged litigation, especially when the evidence of residence is inconclusive. The burden of proof lies with the taxpayer, who must demonstrate that the change of residence was legitimate and not merely a tax artifice.
The doctrine of the General Directorate of Taxes, in recent resolutions (DGT V0478-25 of 2025), has reinforced the need to present compelling and detailed evidence regarding the change of residence. This includes rental contracts, registration records, and evidence of local economic activity.
In conclusion, effective management of the ISD requires a strategic approach tailored to the regulatory particularities of each autonomous community. Tools like LexPartis can be of great help to professionals, allowing for more rigorous and efficient planning of these complex succession processes.