HM Revenue & Customs (HMRC) has updated its guidance on how National Insurance Contributions (NIC) should be applied to bonuses and other cash payments for employees who work across more than one country during the earning period.
This change replaces the previous “all or nothing” approach with a time-apportionment method. For employers with UK operations or internationally mobile employees, this has important payroll and compliance implications.
Under the previous practice, NIC was often determined based on the employee’s social security position at the time the payment was made. In many cases, this meant the full bonus was either subject to UK NIC or not at all.
HMRC has now clarified that this approach is no longer appropriate.
Instead, NIC must be calculated on a time-apportioned basis, reflecting the period during which the employee performed duties in the UK during the relevant earning period. This applies to:
Example
If an employee works:
during the bonus earning period, and receives a £12,000 bonus:
This update introduces several practical considerations:
1. Retrospective Corrections
HMRC expects employers to review prior payroll submissions and correct any NIC under- or overpayments through Real Time Information (RTI).
This may create an administrative burden, but addressing this proactively will reduce audit risk and potential penalties.
2. Enhanced Data Tracking
Accurate time apportionment requires:
Payroll and mobility teams will need robust data collection processes.
3. International Alignment
Where other jurisdictions still apply an “all or nothing” approach, there may be risk of:
Close coordination between UK and overseas payroll teams is essential.
4. Systems and Process Updates
Payroll and HR systems may need to be updated to:
While the guidance introduces compliance obligations, it may also present opportunities.
Where NIC was previously applied in full under the old approach, employers may identify:
A structured review of prior years may result in cost recovery or optimisation of social security contributions for internationally mobile employees.
To manage both compliance and cost impact, employers should:
For further guidance on managing NIC for bonuses and cash payments, including retrospective adjustments, compliance requirements, and planning opportunities, please contact our Global Mobility team at global.mobility@activpayroll.com