moving abroad (spain) working for the uk

Hello Currently, I'm working for a university in the UK. I'm Spanish and have my nationality there and also pre-settlement status in the UK as I was leaving here before Brexit (2020). I have agreed with my line managers that I can work remotely from Spain, but we are not sure of the tax implications that this has. I will be leaving my house in the UK if necessary. I would appreciate advice on the tax implications of working abroad for a UK employer. Thanks!!

Hi

You will need to complete a P85 Get your Income Tax right if you're leaving the UK (P85) to advise that you are leaving the UK and will continue to work for a UK employer.  
HMRC can then advise your employer to stop deducting tax, as you will be taxable on this employment income in Spain.  
If you rent out your UK property, while resident in Spain, you will need to complete a self assessment tax return to declare the rental income, as this is still taxable in the UK.

Thank you