Hi,
As a national of a member state of the European Ecconomic Area (EEA), you are entitled to claim personal allowances by ticking box 16 of SA109 and entering in box 17, the 3 character code relating to the country you are a national and, or, a resident of. You can see the notes for box 16 and 17 on the SA109 help sheet for a list of countries in the EEA and for the other situations that personal allowances can be claimed in box 16 and the 3 character code for the country you are a national and, or, a resident of.
Residence, remittance basis etc notes
Thank you.