There is of course a small window to apply for residencia before the end of the transition period if you are a citizen of the United Kingdom. If you’re living in Spain before the end of 31.12.20 you have until March 2021 to make your application.
To live in Spain for the Residency you need to either own a property, rent a property or have permission to live in a property. However, i have now seen that the Spanish authorities require proof that you are actually here in Spain, so if you could retain copies of your flight tickets, boarding cards, ferry tickets, utility bills, mobile bills, shopping and restaurant receipts and any other appropriate receipts as these may be needed.
If you need any help with your residency application or another legal matter here in Spain myself and my team can help www.justlawsolicitors.com online and in person established 1992.
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Marisa Moreno Senior Lawyer and Consul for Denmark