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"If you’ve been in the UK for 183 or more days you’ll be a UK resident."
So, I'd have to work here for 6 months to keep UK tax residence status.
That's like, summer and 5.5 months of winter. Fuck that.So, it looks like I'd have to tell my company, hope they still wanted to pay me if I moved to Spain, sort out some kind of payment shit like the other international guys have and then worry about what Spain wants on top of that.
I think your HMRC status changes when you move abroad. The SRT rules are at https://www.gov.uk/government/publications/rdr3-statutory-residence-test-srt/guidance-note-for-statutory-residence-test-srt-rdr3 which will determine your UK status which probably matters when looking at any DTA.
If you were doing it the other way round and were resident in the UK for tax purposes (lived here for more than 183 days) but employed in Spain by a Spanish company then you would have to do things like an HRMC tax return. That doesn't mean there is any extra tax to pay (although there might be) but there would be a chunk of extra paperwork. I think you need to find yourself an accountant that specialises in these things.