Mortgage in Spain for Swiss buyers

The Spain-Switzerland Double Tax Convention (1966, revised 2013 protocol) prevents double taxation between both countries.

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

• IRNR (Spanish non-resident tax): 24% on imputed rental income (1.1-2% of cadastral value) for non-EU/EEA residents
• If rented: 24% on gross rental income (limited deductions for non-EU residents — Swiss buyers can't deduct mortgage interest like EU residents)
• Swiss salary, AHV/AVS, BVG, 3a: remain taxed in Switzerland; treaty credit for any Spanish tax paid
• Capital gains on sale: 19% Spanish CGT first; Swiss federal/cantonal CGT may apply with treaty relief
• Swiss federal wealth tax: Spanish property declared at market value in your Steuererklärung; cantonal rates vary

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

• Worldwide income subject to Spanish IRPF (19-47% progressive)
• Swiss BVG/3a withdrawals reportable in Spain with treaty relief
• Modelo 720 required if Swiss assets >€50k per category
• Beckham Law option if relocating for work — flat 24% on Spanish income for 6 years

Action point: non-EU buyers face 24% IRNR (vs 19% for EU) and cannot deduct mortgage interest from rental income. If you plan to rent out the Spanish property, this materially affects your effective return — consult a Spanish tax advisor.

Your Spanish mortgage is in EUR. Your income is (probably) in CHF. The bank applies a 10-15% buffer on declared CHF income — slightly less than the 10-20% applied to GBP because CHF is historically more stable.

Why CHF is often an advantage: Long-term, CHF has appreciated against EUR (decades of trend). If CHF strengthens after you sign your mortgage, your effective monthly payment in CHF terms decreases. Many Swiss buyers benefit from this currency tailwind over the mortgage life.

Practical strategies:

• Open a EUR account in Spain and accumulate 6-12 months of mortgage payments before signing — proves stability cushion
• Use a forex specialist (Wise, Revolut, Currencies Direct) for CHF→EUR transfers — saves 0.5-1.5% vs your Swiss high-street bank
• Consider partial mortgage in CHF — extremely rare in Spain but Julius Baer/UBS occasionally arrange via Luxembourg/private banking channels for HNW clients
• Show CHF pension contracts (BVG, 3a, AHV) as stable income — pensions are not employment-dependent and banks value them highly
• Set CHF/EUR alerts on transfer apps so you can transfer larger amounts at favourable rates