A1 form needs renewed but now I'm retired what form do I use ?

I need a form for Portuguese authorities but now I'm retired which form do I use ?

Hi,
To answer your question we would require further details. For example if you are no longer working at all in the UK, but have a property or a business in Portugal, you should complete the CA8421.  
If you contact our National Insurance team, they will be able to advise you further.
National Insurance: general enquiries
Thank you.