Mortgage in Spain for Dutch buyers

The Spain-Netherlands Double Tax Convention (1971, with 2018 protocols) governs how income, capital gains and inheritance are taxed between both countries.

If you remain Dutch tax resident (less than 183 days/year in Spain):

• IRNR (Spanish non-resident tax): 19% on imputed rental income (1.1-2% of cadastral value), even if the property is not rented
• If rented: 19% on net rental income; deductible expenses include mortgage interest, IBI, community fees, insurance, repairs
• Dutch salary, AOW, bedrijfspensioen: remain taxed only in the Netherlands
• Box 3 declaration: Spanish property must be reported in your IB return at WOZ-equivalent value; mortgage is deductible
• Capital gains on sale: 19% Spanish CGT first; Dutch credit/exemption applies via treaty

If you become Spanish tax resident (>183 days/year):

• Worldwide income subject to Spanish IRPF (19-47% progressive)
• Dutch pension reportable in Spain with treaty relief
• Modelo 720 required if Dutch assets >€50k per category
• Beckham Law option if relocating for work — flat 24% on Spanish income for 6 years

Action point: consult both a Dutch tax advisor (for Box 3 and pension impact) and a Spanish gestor (for IRNR/ITP). Common mistake: forgetting to update Box 3 declaration in the purchase year.

The Dutch Box 3 (Inkomen uit sparen en beleggen) is a notional return on savings and investments — including foreign real estate. From the purchase year, your Spanish property enters Box 3 alongside any Dutch savings and investments.

How it works:

• Asset value: use the WOZ-equivalent (typically the Spanish cadastral value or appraisal value)
• Mortgage liability: deductible from the Box 3 value at the EUR principal outstanding
• Net taxable base: Spanish property value minus Spanish mortgage principal, added to Dutch Box 3 base
• Tax rate: ~36% (2024) on the notional return (legal challenges ongoing; rules evolving)

Practical tip: keep your Spanish bank statements, mortgage statement and IBI receipts for each tax year. Your Dutch tax advisor will need them to size Box 3 correctly and apply any treaty credit.