For a departing individual, the ongoing UK tax and payroll tax withholding requirements depend on a number of things such as whether the individual is going to be absent from the UK for a period spanning a complete UK tax year, and whether they will continue to be employed by the UK company.
If the individual is to be out of the UK for less than two years but will remain on a UK contract, the employer needs to ascertain whether the period of absence will cover a complete UK tax year in order to determine whether their income for the period falls outside the scope of UK PAYE withholding. If, for example, the assignment overseas spans 15 months from March 2011 to June 2012, the whole of the 2011/12 UK tax year will be spent abroad and this is sufficient for the individual to become non-resident for UK tax purposes from the date of departure to the date of return – the implication being that PAYE withholding is not required for that period.
If, in our example, the assignment stretched from June 2012 to September 2013, which is still a period of 15 months but does not now include a complete UK tax year, there would be a continuing PAYE withholding requirement in respect of the individual’s income as they would remain tax-resident in the UK throughout.
The choice of start date for an assignment overseas can therefore have a considerable impact on the tax position of an individual leaving the UK to work.
If the individual is leaving permanently then provided they remain outside the UK for at least one complete UK tax year then they are likely to be treated as non-resident from the date of departure and hence not subject to UK taxes on the overseas income.
Employers of individuals leaving the UK for an assignment abroad will need to consider whether it is appropriate to apply for an NT tax code to be issued by HMRC. This is the tax code which allows the employer to deduct no income tax from an individual on their payroll. The nearest equivalent for National Insurance is known as Table X but care should be taken here. If the assignee is leaving for an assignment in another European country or a country such as the USA with which the UK has a social security agreement, then UK contributions are likely to be due throughout the assignment. This applies to both employer and employee contributions. In such situations an A1 form or 'certificate of coverage' should be applied for from the National Insurance Contributions Office, and a copy kept in case it needs to be provided to the authorities as evidence of a contribution liability.