section 1032 states that certain allowances, deductions, reliefs and reductions shall not be granted to non-residents.
However, certain categories of non-residents (which includes Irish citizens) are entitled to proportionate allowances and reliefs based on the proportion that their Irish income bears to their total worldwide income.
If the person is a resident of another EU state and their Irish income is at least 75% of their total income, then full allowances/reliefs apply.