UK Tax Authority Clarifies Social Security Contributions for Internationally Mobile Employees
Estimated reading time 2 minutes
UK member firm, Abbiss Cadres LLP, shares news on the UK tax authorities issued new guidance on the social security contributions (National Insurance Contributions or ‘NICs’) applicable to internationally mobile employees (IMEs).
This long-awaited update confirms the UK’s preference for the ‘apportionment approach’, aligning more closely with practices in other jurisdictions. Under this method, employers must apportion earnings such as salary, bonuses, and share-based compensation according to the period during which the employee was liable to UK NICs while the income was earned.
HMRC expects employers to review and correct prior filings through the Real Time Information (RTI) payroll process, potentially covering up to six years.
Why this matters for global employers
For multinational companies managing internationally mobile talent, this clarification introduces added complexity but also greater consistency with international norms. It reinforces the need for alignment between payroll, HR, and mobility teams when allocating compensation across jurisdictions.
As the UK founding member of CELIA Alliance, Abbiss Cadres LLP is ideally placed to support employers in applying this updated guidance. Their integrated expertise in law, tax, and HR consulting helps companies interpret and implement compliant approaches to social security contributions and share-based reward planning.
CELIA Alliance member firms around the world collaborate to help employers manage cross-border compliance in all aspects of global mobility, tax, and employment law.
The guidance is available in HMRC’s National Insurance Manual (NIM33650).