According to the Sunday Times Rich List, published in April 2006, Irvine was the fifth richest person of Northern Ireland at that time, having increased his personal fortune to approximately £160 million.
Podle Sunday Times Rich List, publikovaném v dubnu 2006, byl Irvine pátým nejbohatším člověkem v Severním Irsku, jeho majetek se šplhal asi k 160 milionům liber.