Social Security Contributions and Benefits (Northern Ireland) Act 1992

2N.I.Subject to the following paragraphs, Class 4 contributions shall be payable in respect of the full amount of all [F1profits—

(a)which are the profits of any relevant trade, profession or vocation which is not carried on wholly outside the United Kingdom, and

(b)which are chargeable to income tax under Chapter 2 of Part 2 of ITTOIA 2005].