Assuming that you're either a State pensioner, or an early retiree, the financials (and other requirements) to support the application for a Non-Lucrative Visa/Residence Permit are published on the Spanish government website:
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http://www.exteriores.gob.es/Consulados/LONDRES/en/Consulado/Pages/Visas.aspx
- For the first applicant, the sum is calculated as 4 x IPREM (Public Income Index), which in 2020 was € 2,151.36 per month = € 25,816.32
- For each additional dependant, the sum is 1 x IPREM, i.e. € 537.84 per month = € 6,454.08
So for a married couple, that's € 32,270.40 (or its legal equivalent in foreign currency) for 2020. Although I don't have the published figures, IPREM has increased slightly for 2021, resulting in a total for a couple of approx. € 33,500.
Regarding healthcare, you'd need private health insurance for the first year, then you could switch to the Convenio Especial. PHI and the C.E. do not cover prescription costs, but the C.E. doesn't exclude pre-existing conditions. The C.E. is typically a little cheaper than PHI, at € 60 per person, per month, but at age 65, it increases significantly to € 157 per person, per month.
The Non-Lucrative Visa lasts for 3 months, during which you apply for the initial Permit. This is for 1 year and can be extended for 2 years - if you apply to renew the permit twice, i.e. 1 year + 2 years + 2 years, thereby living in Spain for a total of 5 years, you then achieve what the UK calls "settled status" and the Spanish call "Residencia Permanente". At this 5 year point, you no longer have to apply for further permits, as you're entitled to stay indefinitely. I understand that you have to prove the financials and healthcare provision at the initial application and also for each permit renewal, although another member said that this has to be proven every year (until you achieve permanent residency).
The visa process has to be started in the UK at the Spanish Consulate, although I see from their website that the office is temporarily closed.
Kind regards,
Kim