Just one point about residency raised by NAT and Fred Bloggs. There is a double taxation treaty which outlines how residency is determined if you actually satisfy residency requirements in both countries. The double taxation treaty precludes you being resident in both countries, otherwise you'd pay tax twice on some sources of income.
https://assets.publishing.service.go...-_in_force.pdf
Essentially the key criteria is where are your main personal and economic interests. However it makes things a lot easier if you make sure you don't satisfy residency requirements in the UK.
One misunderstanding is that if you are non-resident you aren't subject to tax. If you are deemed to be resident in Turkey but you spend a few weeks working in the UK then that income would be taxed in the UK even though you would be deemed to be resident in Turkey. The UK income would also have to be declared in Turkey but they would take into account tax paid in the UK.
https://assets.publishing.service.go...-_in_force.pdf
Essentially the key criteria is where are your main personal and economic interests. However it makes things a lot easier if you make sure you don't satisfy residency requirements in the UK.
One misunderstanding is that if you are non-resident you aren't subject to tax. If you are deemed to be resident in Turkey but you spend a few weeks working in the UK then that income would be taxed in the UK even though you would be deemed to be resident in Turkey. The UK income would also have to be declared in Turkey but they would take into account tax paid in the UK.

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