http://www.legislation.gov.uk/ukpga/2015/35/section/4National Insurance Contributions (Rate Ceilings) Act 2015An Act to set a ceiling on the main and additional primary percentages, the secondary percentage and the upper earnings limit in relation to Class 1 national insurance contributions.texttext/xmlenStatute Law Database2016-03-172015-12-17Final

4Interpretation

In this Act—

“SSCBA 1992” means the Social Security Contributions and Benefits Act 1992;

“SSCB(NI)A 1992” means the Social Security Contributions and Benefits (Northern Ireland) Act 1992.