Thanks for the response Upnotover - the source of the income would be a family loan but I would be repaying it with income from a return on investment. Although I am a UK citizen, I was declaring my tax returns in USA until last year (through owning a single member LLC that has now closed) but this year that will not be the case. I was thinking of registering as a sole proprietor in UK again because I know I have to declare somewhere and although I hoped to register here, it seems completely impractical in my case.
With regards to what could happen in 2026, I don't want to simply postpone any issue now to next year. If I transfer the money now, would that probably be the case?