I departed from the UK in 2021.
During my UK time I earned money both in the UK and overseas (overseas part was taxed overseas accordingly to the overseas tax laws). The total of both earnings during UK part of the year is less than the personal allowance in the UK for 2021.
I qualify for 3rd case of split year treatment.
After I departed I earn money and are taxed only in the country I departed to and earn at.
Which amount do I include on the Self Assesment? Only UK part of the year from both of the countries?
On form SA109, do I need to tick any of the boxes: 15, 16, 17 to show I want to use my personal allowance regarding the earnings from both countries earned during the UK part (which would entitle me to a full refund)?
Do I need to additionally fill out any of the boxes 18-22 and get claim form 302 or 304 filled out as well? Which income do I list there if yes? All income during UK part that I would like to get full refund on or earnings from non-UK part of the year that I do not want to pay additional tax since I'm claiming split year treatment on them?
Many thanks for the guidance!