Both are Spain. Both speak Castilian (and the local cooficial — Mallorquín in the Balearics, Andaluz dialect in the south). Both are 35–45 minutes from a major international airport. The structural difference usually cited for the Marbella vs Mallorca trade is not climate, inventory, or buyer demographics — it is wealth tax: Andalucía applies a 100% bonificación to its regional Patrimonio, while the Balearic Islands charge their own scale. Above the threshold of the state solidarity tax the gap narrows sharply, because in Andalusia the relief is limited to the difference between the two bills. On €10M of net assets with no debt, the Andalusian taxpayer pays what the solidarity tax would charge: €10,000,000 − €700,000 = €9,300,000, which on the solidarity-tax scale gives €39,915.97 + 2.1% × (€9,300,000 − €5,347,998.03) = about €122,900 a year. The Balearic bill has to be computed on the islands' own scale by a tax adviser; the difference is that bill less this one, not the whole of it.
This piece runs the comparison at the granular level our HNW buyers actually need: Andratx and Son Vida against Sierra Blanca and the Golden Mile, German and Scandinavian buyer concentration against Marbella's diversified pool, and the regional Patrimonio mechanics that separate the two markets after tax.
A Marbella tax-resident with €10M of net assets does not pay zero: Andalucía's 100% bonificación is limited by the state solidarity tax, and the bill on that estate is about €122,900 a year, as worked above. A Mallorca tax-resident with the same €10M pays Balearic Patrimonio on the islands' own scale; this desk has not verified a figure for it and prints none. Inheritance tax is the second structural break — Andalucía applies a 99% bonificación to direct descendants; the Balearic Islands apply a lower (70%–99%) bonus depending on band and reform cycle.
Mallorca wins on island-isolation appeal, finca inventory in the rural Es Pla, German and Scandinavian community density, and the Tramuntana mountain microclimate around Deià and Sóller. Marbella wins on golf density, climate consistency, school breadth and resale liquidity.
Both sides of this comparison are described from the asking side. Spain publishes no per-property closing price in either region, so no completion figure appears here for Marbella or for Mallorca.
On the same budget, Andratx offers a port-view villa with Mediterranean garden where Sierra Blanca offers a larger villa on a substantially larger plot. The Andratx premium reflects German and Scandinavian demand and genuinely scarce port-frontage inventory.
The trophy band tightens. At the top, Andratx offers a port villa and Son Vida a gated estate; Marbella offers a Sierra Blanca designer villa or an upper La Zagaleta estate on materially larger plots. Current asking prices by zone, each with its sample size and date, are on the Marbella Property Index (museselection.es/marbella-property-index).
This is the analytical core. Both regions apply national Spanish IRPF, IRNR, IBI and ITP — what differs is the autonomous community treatment of Patrimonio and Inheritance.