ERSM160820 - Ascertaining Foreign Securities Income (FSI) - up to 5 April 2015: non-domiciled/not s26A employees
ITEPA03/S41C(3) says that if any part of the relevant period is within a tax year to which subsection (4) applies, the securities income treated as accruing in that part of the period is “foreign”. This is subject to ITEPA03/S41D, which applies where the non-domiciled employee has one or more associated employments with UK duties - see ERSM160830.
With effect from 17 July 2014 it is also subject to ITEPA03/S24A (Restrictions on remittance basis), on which guidance can be found at https://www.gov.uk/government/publications/remittance-basis-of-taxation-dual-contracts-restrictions-for-foreign-domiciled-employees