Anonymer Teilnehmer 773 there is extensive reports about the whole process in this fb group… but for workcation its all documents again. freshly dated. financial, work, etc… plus residency proof = contract, housebook, id of owner, pictures, map. the same as retirement visa holders need to present… for soft power you will need to proof everything again as well. ongoing activity. plus pictures of you doing the activity
in many countries your account will be locked if you cannot provide a national tax id. so why not here? ;) and reporting is getting tighter every year. at some point the authorities will all share the data and then its easy to check the tax id and if tax documents have been filed.
i hope you can proof that that specific €$£ wasnt earned in that year ;)
anyway i am pretty sure that you have to file tax no matter what. even if the result is zero. the DTA will just determine where and how much tax you pay. not where you put in your (additional) documents.
why? because you dont like such an easy approach? :) in other countries its common that a bank requires your tax id and if you dont give these information then your account gets locked.
what if they spin it this way: to have a bank account active you have to hand in your tax documents each year or have whatever document that exempts you. they would put all the workload on the banks.