Taxing an Inheritance Before It Can Be Accepted: The Supreme Court Requires Income Tax on Income Earned by an Undivided Estate

By: Josep Navarro

The Spanish Supreme Court’s Judgment 833/2026 holds that a person named as an heir for a future date must report income allocated from an undivided estate, even before taking ownership or being able to dispose of its assets.

It is possible to owe Spanish personal income tax (IRPF) on an inheritance that has not yet been accepted. In Judgment 833/2026 of 2 July, the Court considered two people named as heirs whose will barred them from accepting for six years. While they waited, the estate generated a substantial capital gain. Although the intended heirs did not own or control the assets, the Court held they had to pay IRPF on the income earned in that period. The conclusion has a statutory basis, but raises a difficult question about economic capacity when a taxpayer must pay tax on income they did not personally generate and may not have received.

An inheritance held in limbo for six years

A woman died on 23 January 2013, naming her two nephews equal heirs subject to a six-year term. They could not accept the inheritance until the term ended on 23 January 2019; meanwhile, an executor administered the estate. This was an herencia yacente, an undivided estate: the deceased’s assets, rights and liabilities before their definitive acquisition by successors.

In 2014, management of the estate produced a capital gain of €1,416,230.96, calculated from the difference between the value of certain assets at death and their sale value. Half (€708,115.48) was allocated to each nephew. One nephew initially reported the amount on his IRPF return, then sought a refund because he could not yet accept the inheritance or own the assets. The Tax Inspectorate rejected the claim; the Regional Tax Tribunal and High Court of Justice of Madrid upheld the assessment. The case reached the Supreme Court as cassation appeal 2040/2024.

The question before the Supreme Court

The issue was whether income earned by an undivided estate must be allocated for IRPF purposes to people named as heirs subject to a term, before they acquire the assets. The taxpayer argued that a gain generated by property that was not yet his could not be attributed to him.

His argument had a civil-law basis. Article 805 of the Civil Code allows a will to set a date or term for the effects of appointing an heir. Here, the will delayed acquisition and expressly prohibited acceptance for six years. The Supreme Court acknowledged that before the term expired the named heir could not accept the inheritance or acquire the assets. It also rejected the argument that filing an IRPF return amounted to tacit acceptance: filing and paying tax fulfils a tax duty, not a civil-law act of accepting an inheritance. Even so, the appeal was dismissed.

The estate does not pay IRPF; the heirs do

Article 8.3 of the Spanish Personal Income Tax Act provides the basis. Undivided estates are not taxpayers for IRPF. Instead, their income is allocated to partners, heirs, co-owners or participants under the pass-through income regime. This prevents income from escaping tax between death and acceptance of the inheritance.

The estate must determine its income and communicate each person’s share. Recipients report that share in their own returns, preserving the income’s character: rental income, investment income, capital gains or business income, as applicable. Articles 88 to 90 of the IRPF Act govern classification, calculation and communication. The difficulty is that an appointed heir may be unable to accept or control the assets.

The Supreme Court gives “heir” a specific tax meaning. For Article 8.3, the term includes the person named in the will even if they have not accepted the inheritance or acquired the assets under civil law. Otherwise, income could fall outside both IRPF and Corporation Tax, since the estate has no legal personality and is not itself a taxpayer. Deferring acquisition delays acceptance, but does not remove the appointment of the heir for tax purposes.

Income generated by an undivided estate must be allocated for IRPF purposes to the people appointed as heirs, including heirs subject to a term, even if that term has not expired and the inherited assets or rights have not yet been acquired.

The taxpayer is not yet the owner

The judgment expressly recognises that participants in an undivided estate are not owners of the assets and rights that generate the allocated income. Nevertheless, the Court considers that the legislature placed such estates under the pass-through rules for other entities without legal personality. This is the most controversial part of the decision.

IRPF generally taxes income obtained by a taxpayer, including investment returns, business income and capital gains. Here, the nephew did not directly generate the gain; it arose from administration of assets over which he had no ownership or power of disposal. The Court says IRPF taxes income generated by the estate, not a transfer of assets to the heir. The tax debt is nevertheless charged to the appointed heir. Legally, this fits the statutory allocation regime; economically, income is assigned before the taxpayer can control the assets that produced it.

Is there double taxation with Inheritance Tax?

The taxpayer argued that the gain might be taxed twice: first under IRPF while the estate was pending, then under Spanish Inheritance and Gift Tax when the term expired and he acquired the assets. Article 24.3 of the Inheritance and Gift Tax Act provides that where an acquisition is suspended by a condition, term, trust or other limitation, it is treated as taking place when the limitation ends.

The Supreme Court rejected double taxation because the taxes apply to different taxable events:

IRPF taxes income and gains earned by assets while the estate remains undivided.
Inheritance Tax taxes acquisition of the assets and rights when the term expires and the heir can accept.

The Court added a qualification: the record did not show how the Inheritance Tax base had ultimately been calculated in 2019. It therefore considered the alleged double taxation future and hypothetical in the IRPF assessment under review. The judgment rejects double taxation on the facts before it, but does not examine a final Inheritance Tax assessment to determine whether the increase in value already taxed under IRPF affected the later valuation.

The practical problem: tax without access to cash

The judgment determines who must report the income but does not resolve the heir’s possible lack of liquidity. A person appointed for a future date may have received no money; the assets may remain under an executor’s control, and the will may prevent the heir from accepting, selling or disposing of them. Yet the allocated income must be included in the IRPF return.

In this case the gain allocated to the nephew exceeded €708,000. The rule is not limited to large estates: it may affect inheritances with rented property, company shares, investment portfolios or other assets that generate profits without putting cash in the heir’s hands. The tax authority taxes allocated income, not necessarily cash received. The taxpayer may need financing or personal assets to pay a liability arising from property they cannot yet own. The statute contains no rule guaranteeing access to estate liquidity to pay that tax.

Implications for succession planning

Judgment 833/2026 calls for careful review of wills containing future terms, conditions, restrictions on disposal or long administration periods. Deferring acquisition may protect younger heirs, prevent rushed decisions, preserve family assets or place temporary management in trusted hands. But a civil-law delay does not necessarily defer IRPF.

Where an estate may earn income while pending, arrangements should address who manages the assets and meets reporting duties; how each heir’s allocated income is calculated; what documents will be provided each year; how IRPF will be paid; whether the administrator may release funds solely to meet tax liabilities; and what happens if a named heir dies, renounces or ultimately does not acquire the assets.

The judgment does not resolve every scenario. In this case, the taxpayer’s right to inherit was certain and he had not renounced. The ruling should not automatically be extended to uncertain or conditional appointments that ultimately fail.

A legal rule that is hard to explain to taxpayers

The Court’s reasoning is that because an undivided estate does not pay IRPF, someone must; that person is the one named as heir, even if they cannot yet accept the assets. This prevents income from going untaxed but places the practical strain on the taxpayer. For tax purposes they are treated as an heir who must pay; under civil law they cannot yet accept, acquire or dispose of the assets.

The heir is not charged IRPF on the full value of an inheritance they have not received. The tax applies to income generated by the estate during the waiting period. Still, the paradox remains:

For civil-law purposes, the person cannot yet inherit; for tax purposes, they already have to pay as an heir.

Judgment 833/2026 settles the issue at least for heirs appointed subject to a term. It warns notaries, advisers and families that postponing an inheritance does not necessarily postpone its taxes. When civil and tax law move at different speeds, the Tax Agency may arrive first.