# Spanish Inheritance Tax 2026: How Andalucía's 99% Bonificación Reshapes HNW Estate Planning

Most international families assume Spanish inheritance tax (Impuesto sobre Sucesiones y Donaciones, ISD) is a national tax with a national scale. It isn't. ISD is a regional tax, and the variance between regions is the single largest tax-arbitrage opportunity for HNW estate planning in Western Europe. A €15M generational transfer between parent and child can cost €5.5M in Cataluña, €3.2M in Asturias, and **€55,000 in Andalucía** — for the same family, the same assets, the same date of death. The 99% bonificación is the structural reason most UK, German, and US families with €5M+ Marbella exposure now register the recipient generation as Andalusian-resident before the transfer, not after.

## Direct answer

ISD is regulated nationally by **Ley 29/1987 of 18 December** (Ley del Impuesto sobre Sucesiones y Donaciones) but ceded to the autonomous communities for rate-setting and bonificación. The national scale runs from **7.65% on the first €7,993** to **34% on amounts above €797,555**, with multipliers (coeficientes multiplicadores) of up to 2.4 applied based on the recipient's pre-existing wealth and family relationship to the deceased. Heirs are grouped: **Group I** (descendants under 21), **Group II** (descendants 21+ and spouses), **Group III** (siblings, ascendants in second degree, in-laws), **Group IV** (cousins, unrelated). Andalucía applies a **99% bonificación** on the cuota for Group I and II under **Ley 5/2021**, reducing the effective rate from 30%+ to roughly 0.3%-1% on most transfers. The bonificación is conditioned on the recipient being Andalusian-resident or the deceased having had Spanish residency or Spanish-situs assets — the residence test is the single most important compliance point.

## How ISD actually works — the four-step calculation

Every ISD calculation runs through four sequential adjustments. Understanding the sequence is the difference between getting the bonificación right and accidentally paying the national scale on a region's worst-case interpretation.

### Step 1 — Establish the taxable estate

Identify the assets passing to each individual heir. The taxable base for each heir is **their share of the net estate** (gross assets minus debts and deductible expenses), plus any pre-existing equalisation gifts (donaciones colationables) made in the prior 4 years.

Allowable deductions from the gross estate include:

- Mortgages secured against estate assets
- Funeral expenses (capped at €3,005)
- Final medical expenses
- Outstanding tax liabilities of the deceased

### Step 2 — Apply the personal allowance (reducción personal)

Each heir applies a personal allowance based on their group:

| Group | Relationship | National personal allowance |
|---|---|---|
| **I** | Descendants under 21 | €15,956.87 + €3,990.72 per year under 21 (capped €47,858.59) |
| **II** | Descendants 21+, spouses, ascendants | €15,956.87 |
| **III** | Siblings, in-laws, ascendants 2nd degree | €7,993.46 |
| **IV** | Cousins, unrelated | €0 |

Andalucía has expanded the Group I allowance under regional law to €1,000,000 per heir under specific circumstances (residence requirements, qualifying business asset transfers). The interplay with the 99% bonificación is examined in detail in [our Andalucía 99% bonification article](/article-andalucia-99-inheritance-bonification).

### Step 3 — Apply the national progressive scale to the taxable base

The cuota íntegra is calculated on the post-allowance base via the national scale (Ley 29/1987 art. 21):

| Taxable base | Marginal rate | Cumulative tax at top of band |
|---|---|---|
| €0 - €7,993.46 | 7.65% | €611.50 |
| €7,993.46 - €15,980.91 | 8.50% | €1,290.43 |
| €15,980.91 - €23,968.36 | 9.35% | €2,037.26 |
| €23,968.36 - €31,955.81 | 10.20% | €2,851.98 |
| €31,955.81 - €39,943.26 | 11.05% | €3,734.59 |
| €39,943.26 - €47,930.72 | 11.90% | €4,685.10 |
| €47,930.72 - €55,918.17 | 12.75% | €5,703.50 |
| €55,918.17 - €63,905.62 | 13.60% | €6,789.79 |
| €63,905.62 - €71,893.07 | 14.45% | €7,943.98 |
| €71,893.07 - €79,880.52 | 15.30% | €9,166.06 |
| €79,880.52 - €119,757.67 | 16.15% | €15,606.22 |
| €119,757.67 - €159,634.83 | 17.00% | €22,385.34 |
| €159,634.83 - €239,389.13 | 18.70% | €37,304.84 |
| €239,389.13 - €398,777.54 | 21.25% | €71,177.91 |
| €398,777.54 - €797,555.08 | 25.50% | €172,816.51 |
| €797,555.08+ | 34.00% | progressive |

### Step 4 — Apply the multiplier (coeficiente multiplicador)

The cuota íntegra is then multiplied by a coefficient based on (a) the heir's pre-existing wealth and (b) the heir's group:

| Pre-existing wealth | Group I-II coefficient | Group III coefficient | Group IV coefficient |
|---|---|---|---|
| €0 - €402,678.11 | 1.0000 | 1.5882 | 2.0000 |
| €402,678.11 - €2,007,380.43 | 1.0500 | 1.6676 | 2.1000 |
| €2,007,380.43 - €4,020,770.98 | 1.1000 | 1.7471 | 2.2000 |
| €4,020,770.98+ | 1.2000 | 1.9059 | 2.4000 |

A wealthy Group IV heir (e.g., a €5M-net-worth nephew receiving from an uncle) faces a cuota multiplied by 2.4 — pushing the effective rate from 34% to 81.6% on the top slice. This is why estate planning between non-direct relatives in Spain is a structural disaster outside of regional bonificación regimes.

### Step 5 — Apply the regional bonificación

This is where Andalucía changes everything. After the cuota and multiplier are calculated by the national rules, the regional bonificación is applied to the final cuota. Andalucía's 99% bonificación under Ley 5/2021 reduces the final cuota for Group I and II heirs to **1% of the calculated amount**. So a calculated cuota of €5,000,000 becomes a payable cuota of €50,000.

The bonificación applies to:
- Mortis causa transfers (deaths) — full 99% bonification on cuota
- Inter vivos donations — full 99% bonification on cuota
- Both Group I and Group II heirs

It does **not** apply to:
- Group III or IV heirs (siblings, cousins, unrelated)
- Non-Andalusian heirs (residency test)
- Donations of assets situated outside Spain to non-Andalusian recipients

## Worked example — €15M generational transfer

A UK-based widow holding a €15M estate (Marbella villa €5M + UK property €4M + global investment portfolio €6M) dies in 2026 with two adult children, one resident in London and one resident in Marbella. Each child inherits €7.5M.

### Path 1 — Marbella-resident child (Group II, Andalucía resident)

| Step | Calculation | Result |
|---|---|---|
| Gross share | €7,500,000 | €7,500,000 |
| Personal allowance | €15,956.87 | €7,484,043.13 |
| National progressive cuota | €797,555 at 25.5% scale = €172,817 + (€6,686,488 × 34%) = €2,275,406 | €2,448,223 |
| Coefficient (pre-existing wealth €500K) | × 1.05 | €2,570,634 |
| Andalucía 99% bonificación | × (1 - 0.99) | **€25,706 payable** |

### Path 2 — London-resident child (Group II, non-Andalusian)

The non-Andalusian heir does not access the regional bonificación. They are taxed under either national default rules (no bonificación) or, if they elect Andalusian residence test treatment under EU Court of Justice ruling C-127/12 (2014, "Comisión v España"), they may potentially access the regional bonificación for inheritance from a Spanish resident.

Post-CJEU C-127/12, EU/EEA non-Spanish-resident heirs can elect the regional regime applicable where the deceased was resident, or where Spanish-situs assets are located. The London-resident child is no longer EU post-Brexit, but UK-Spain tax treaty provisions and reciprocal arrangements may still apply — practical reality is that AEAT's interpretation of UK heirs' bonificación rights remains unsettled and case-by-case.

If the London child cannot access the bonificación:

| Step | Calculation | Result |
|---|---|---|
| Gross share | €7,500,000 | €7,500,000 |
| Personal allowance | €15,956.87 | €7,484,043.13 |
| National progressive cuota | €2,448,223 | €2,448,223 |
| Coefficient × 1.05 | €2,570,634 | €2,570,634 |
| **No bonificación** | | **€2,570,634 payable** |

### Combined family outcome

| Heir | ISD payable |
|---|---|
| Marbella-resident child | €25,706 |
| London-resident child (no bonificación) | €2,570,634 |
| **Total ISD on €15M estate** | **€2,596,340** |

Compare to a hypothetical scenario where both children are Andalusian residents at the time of inheritance: total ISD ≈ €51,412. The structural difference: **€2.5 million on a single transfer**.

This is the calculation that drives most HNW UK and German families to either (a) relocate the next generation to Andalucía in the years before the transfer or (b) transfer assets via inter vivos donation while the donor is Andalusian-resident, locking in the bonificación during the donor's lifetime rather than gambling on the heirs' residency at death.

## Regional comparison snapshot

For a €5M parent-to-child Group II transfer, effective ISD by region (2026):

| Region | Bonificación | Approximate effective ISD on €5M | Effective rate |
|---|---|---|---|
| Andalucía | 99% (Ley 5/2021) | €15,000 - €18,000 | ~0.3% |
| Madrid | 99% (Ley 4/2014) | €15,000 - €18,000 | ~0.3% |
| Cantabria | 100% (above €100K base) | ~€0 | ~0% |
| Murcia | 99% | €15,000 - €18,000 | ~0.3% |
| Galicia | 100% Group I (under 21); progressive Group II | varies | varies |
| Cataluña | None (ordinary scale) | €1,800,000+ | ~36% |
| Asturias | Limited reductions | €1,400,000+ | ~28% |
| Valencia | 50% on first €100K | €1,700,000+ | ~34% |
| Aragón | 65% bonification under specific conditions | €600,000+ | ~12% |

The variance is structural, intentional, and politically contested. Cataluña and Asturias have repeatedly proposed national harmonisation; Madrid and Andalucía have repeatedly defended regional autonomy. The Constitutional Court has consistently upheld the regional regime, most recently in **STC 60/2015** and subsequent rulings.

## The residence test — what makes you "Andalusian" for ISD purposes

For ISD purposes, the heir's residence is determined by **the autonomous community where they had their habitual residence for the longest portion of the preceding five years** before the date of death (mortis causa) or donation (inter vivos), per **Ley 22/2009 art. 32**.

So a UK national arriving in Marbella in 2026 cannot use the Andalusian bonificación on a death occurring in 2026 — they need to have been Andalusian-resident for at least 31 months out of the preceding 60. The residence-establishment timing is the single most important planning element for HNW families anticipating a transfer.

For inter vivos donations of real estate located in Andalucía, the regime applies regardless of donee residency under the post-CJEU C-127/12 reform — Spanish-situs real estate gifted to anyone follows the situs's regional regime.

For full mechanics of the Andalusian regime including residence requirements, family-relationship requirements, and worked €5M / €15M / €50M parent-to-child examples see [our dedicated Andalucía 99% bonificación article](/article-andalucia-99-inheritance-bonification).

## Where families commonly trip up

**Assuming the regional scale applies because the property is in Marbella.** It doesn't automatically. The bonificación applies based on heir residency (mortis causa) and asset situs (donations of Spanish real estate). A UK-resident child inheriting a Marbella villa from a Marbella-resident parent gets a partial path via post-CJEU election, but it's narrower than Andalusian residency.

**Forgetting the 4-year colación rule.** Pre-existing donations made by the deceased to the same heir in the 4 years before death are added back to the inheritance base. A €2M gift in 2023 followed by a €5M inheritance in 2026 is taxed on €7M (not €5M).

**Ignoring the multiplier.** The multiplier is the silent killer for non-direct heirs. A €1M inheritance to a wealthy nephew (Group IV with pre-existing wealth >€4M) faces a 2.4× multiplier on the top-rate cuota — pushing effective tax above 80% on the top slice. Estate planning between non-direct relatives must use lifetime structures (trusts, family limited partnerships, Spanish SLs with progressive ownership transfers) rather than relying on bequest at death.

**Filing the wrong form.** ISD is filed on **Modelo 650** (mortis causa, acceptance of inheritance) or **Modelo 651** (inter vivos donations), within **6 months of death** (extendable by 6 months on request before the deadline) or **30 working days of donation acceptance**. Late filings trigger LGT article 27 surcharges (5%-20%) plus statutory interest.

**Not coordinating with home-country inheritance tax.** UK Inheritance Tax (IHT, 40% above £325K nil-rate band), US Federal Estate Tax (40% above $13.6M as of 2026, with state-level variations), German Erbschaftsteuer all apply to global estates of their respective residents. The Spain bilateral treaties cover inheritance tax credit only with **Greece, France, and Sweden** — not with the UK, US, or Germany. Most HNW families therefore face double taxation on cross-border estates and need legal coordination.

**Misvaluing Spanish real estate.** ISD valuation uses the higher of: (a) the property's "valor de referencia" (Catastro reference value, in place since January 2022 under Ley 11/2021), (b) any other declared market value. Under-valuing to reduce ISD triggers a "comprobación de valores" by the regional tax authority and frequently produces a higher reassessment plus penalties.

## When to call Muse

If you're holding €5M+ Marbella assets and the next generation is dispersed across multiple jurisdictions, book an inheritance-planning call before any wealth-related decisions cross the calendar — Andalusian-residence positioning and inter vivos donation timing both require multi-year lead time and are typically the most tax-efficient lever in the entire HNW estate-planning toolkit.

## FAQ

**Does the 99% bonificación apply to non-Spanish-resident heirs?**

It depends. EU/EEA heirs can elect the regional regime applicable where the deceased was resident or where Spanish-situs assets are located, under post-CJEU C-127/12 reform. Non-EU heirs (UK post-Brexit, US, Singapore) face a less settled position — case-by-case interpretation by AEAT. The cleanest outcome is to establish heir residency in Andalucía at least 31 months before the expected transfer.

**What's the difference between mortis causa (inheritance) and inter vivos (donation)?**

Mortis causa = transfer at death, taxed via Modelo 650 within 6 months. Inter vivos = lifetime gift, taxed via Modelo 651 within 30 working days. Both face the same scale, multiplier, and bonificación. The donor's residency at the date of donation determines bonificación access for inter vivos transfers.

**Can I gift my Marbella villa now to lock in the bonificación?**

Yes — and this is a common HNW strategy. Inter vivos donation of Spanish-situs real estate during the donor's Andalusian residence locks in the 99% bonificación at the date of donation, regardless of where the heir lives or where the donor relocates afterward. Coordinate with our [wealth structuring guide](/article-2026-05-14-wealth-structuring) to weigh against the parallel CGT exposure on the donor.

**What about my UK inheritance tax exposure?**

The UK-Spain treaty does not include reciprocal IHT credit, so the UK 40% IHT and the Spanish ISD apply in parallel. Net cost can exceed 50% on the same assets. Most HNW UK-Marbella families address this via lifetime giving (UK 7-year rule), trust structures, or full UK domicile severance — outside the scope of this article, but the structural reason proper planning matters.

**Is the Andalucía bonificación at risk of repeal?**

Politically yes; practically no. The bonificación has survived multiple election cycles and Constitutional Court challenges. The Junta de Andalucía has consistently defended it as core to regional fiscal competitiveness. The risk horizon is 2030+ rather than 2026-2027, but every HNW family should build "what if it ends" sensitivity into their planning.

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**Modelling Spanish inheritance tax against your specific Marbella holdings and family geography?** Muse Marbella's tax desk works with cross-jurisdictional estate planners to model the full ISD + UK IHT / US Estate Tax / German Erbschaftsteuer interaction and structure timing, residency, and ownership transfers to keep effective tax defensible. Browse current inventory in our [properties listing](/properties), orient on the full acquisition flow in the [Marbella buyer guide 2026](/buyer-guide-2026.html), and review the broader tax architecture in our [Spanish property tax and legal complete guide 2026](/spanish-property-tax-legal-complete-guide-2026).



## Related Reading

- [Andalucía 99% Inheritance Bonificación 2026 — Full Mechanics | Muse Marbella](/article-andalucia-99-inheritance-bonification-en)
- [Wealth Structuring for Marbella Property 2026](/article-2026-05-14-wealth-structuring-en)
- [Patrimonio + Solidaridad 2026 — Andalucía's 100% Waiver | Muse Marbella](/article-spanish-patrimonio-solidaridad-mechanics-en)
- [IRNR Spain 2026 — Non-Resident Income Tax on Property Explained | Muse Marbella](/article-irnr-spanish-tax-non-residents-en)
- [Spanish Property Tax & Legal Complete Guide 2026 | Muse Marbella](/spanish-property-tax-legal-complete-guide-2026)