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As long as you own a real state propiety in spain you must pay taxes
Taxes are according to your income, taxes paid in your country are deductibles in Spain, so you do not have to pay twice
The real satte tax is 1.1 per cent of the castastral value each year to be added to your income
Get more information here about spanish tax http://www.strongabogados.com/taxes.php#PersonalTaxes
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