This Practice Note explains when National Insurance contributions (NICs) charges, namely primary and secondary Class 1 NICs and Class 1A NICs, arise in the context of employment-related securities and securities options. For more information about NICs generally, see Practice Note: National Insurance contributions—introduction. For current rates and thresholds applicable to NICs, see Practice Note: Key UK tax rates, thresholds and allowances. For details about PAYE and employment-related securities and securities options, see Practice Notes: PAYE implications of employment-related securities, PAYE implications of securities options and PAYE—readily convertible assets, intermediaries and jurisdictional scope. For details of an employer's reporting obligations in relation to employment-related securities and securities options, see Practice Note: Employment-related securities—reporting obligations. For details of the NICs (and tax) implications where an internationally mobile employee has employment-related securities or securities options, including the regimes that were introduced with effect from 6 April 2025 as part of the removal of domicile as a relevant factor in the UK tax system and the abolition of the remittance basis of taxation, see Practice