A1 Form

Hello, I am looking to move to Spain, I would be working remotely for a UK company, firstly, can I qualify for an A1? If so, can I extend this after 2 years? I’m not sure if you can advise on this or not, if U go to Spain without an A1 or if it runs out and begin paying my tax and social security in Spain, will my UK employer also have to pay social security to Spain?

Hi 
Have a look at the guidance here:
Apply for a certificate confirming you will pay UK National Insurance when working temporarily abroad (CA3822)
Thank you.