UK citizens without a certificate of EU registration
UK citizens residing before and after December the 31st 2020
They can apply for Spanish residence until June the 30th 2021 provided that they prove that they resided legally in Spain before December the 31st 2020.
UK citizens residing in Spain before the December 31st 2020 because they were family of another EU or EEA
They can apply for Spanish residence until June the 30th 2021 provided that they prove that they resided legally in Spain before December the 31st 2020.
UK citizens not residing in Spain before the December 31st 2020 but they are family of another EU or EEA and they are reuniting with them
Submission deadline: (a) June the 30th 2021 if they arrived before March the 31st 2021, or (b) three months after arrival if this occurs after March the 31st 2021.
UK citizen born or adopted after December the 31st 2020 from a resident in Spain
Submission deadline: (a) Three months from the birth or adoption, or from your arrival in Spain, or (b) until June the 30th 2021 if the birth, adoption or arrival occurs before March the 31st 2021.
Applications submitted after the deadline
The immigration office will assess individually the reasons of the application delay.
More information from the UK government.
You can find it in this link.
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WARNING
Please, note that this is general information. This is not specific legal advice. It is advisable to seek legal advice for any specific legal issue.