The process of regularizing undeclared or incorrectly declared inheritances before the State Agency for Tax Administration (AEAT) and the Autonomous Tax Authorities is an increasingly relevant topic in the field of succession law. In our daily practice, we have observed a growing number of inquiries regarding the statute of limitations for the Inheritance and Donations Tax (ISD), as well as the tax consequences faced by heirs. This article aims to break down the administrative procedure and the possible penalties, providing a clear framework to address these cases with rigor and effectiveness.
The Regulatory Framework of ISD
The Inheritance and Donations Tax (ISD) is regulated at the state level, although its management corresponds to the autonomous communities. It is essential to understand that the general statute of limitations for ISD is four years from the day after the expiration of the regulatory deadline for filing the self-assessment. However, this period extends to ten years for undeclared or incorrectly valued assets, as established by Article 66 of the General Tax Law. This extension is crucial, as it allows tax authorities to act on assets that have remained off the radar for a significant period.
Article 122 of the General Tax Law introduces the figure of late declaration, allowing taxpayers to regularize their situation before the Administration initiates a verification procedure. The submission of a late declaration involves a surcharge that varies depending on the time elapsed since the end of the voluntary deadline, ranging from 5% to 20%, with no late payment interest if submitted before the Administration requires payment.
Regularization Procedure
When the lack of declaration of an inheritance is detected, the procedure generally begins with a notification of provisional settlement. The AEAT or the corresponding Autonomous Tax Authority issues this notification, detailing the discrepancies found. At this point, the taxpayer has the opportunity to present allegations or additional documentation that may mitigate the tax debt or justify the initial omission.
It is important to highlight that during the inspection procedure, there is the possibility of reaching an agreement with the Administration. According to Article 155 of the General Tax Law, taxpayers can propose an agreement that, if accepted by the Administration, could reduce penalties by up to 50%. This option is particularly advantageous in cases where the omission was involuntary or good faith in regularization can be demonstrated.
Applicable Penalties and Surcharges
The failure to declare or the incorrect declaration of an inheritance can lead to significant penalties. The basis for the penalty is calculated on the tax amount not paid, applying a percentage that varies according to the severity and nature of the infringement. According to Article 191 of the General Tax Law, penalties can be mild, serious, or very serious, with percentages of 50%, 100%, or even 150% on the tax amount.
Additionally, the regulations provide for the possibility of reducing penalties if the taxpayer accepts the proposed settlement without filing appeals, potentially reducing the penalty by 30%. This incentive aims to encourage collaboration with the Administration, allowing for a more agile and less burdensome resolution for both parties.
Practical Cases and Common Litigations
In our experience, one of the most common litigations arises around the valuation of real estate included in the inheritance. The jurisprudence of the Supreme Court has established that the valuation must be objective and in accordance with market value, which does not always coincide with the cadastral value or the value declared by the taxpayer. Judgments such as STS 362/2025 have reiterated that the Administration must provide solid evidence to justify any adjustments in valuation.
Another frequent contentious aspect is that of cross-border inheritances, where the residence of the deceased or the heirs can complicate the determination of the applicable legislation. Recent guidelines from the DGT have clarified some of these aspects, but gray areas still persist that require detailed analysis of each specific case.
- Submit the late declaration before the initiation of a verification procedure to avoid late payment interest.
- Consider the possibility of reaching an agreement with the Administration to reduce penalties.
- Carefully analyze the valuation of real estate to avoid tax adjustments.
In conclusion, the tax regularization of undeclared inheritances requires a meticulous approach and a clear understanding of current regulations. Tools like LexPartis are invaluable for professionals, facilitating efficient and rigorous management of these complex processes, allowing us to focus on providing the best advice to our clients.