Cowin was listed on the Australian BRW Rich 200 list at number 70 in 2008, and 79 in 2009, and had an estimated net worth of A$486m and an estimated value of A$538m in 2010. Cowin was ascribed a net worth of A$1.8bn (24th) in the 2016 BRW Rich 200. Despite this, in 2017, he has been noted for his miserliness with regards to weekend worker penalty rates within Australia, regarding them as a "thing of the past". In 2019 the Financial Review Rich List, the successor of the BRW Rich 200, assessed Cowin's net worth at A$2.79 bn; and was ranked as the 25th richest Australian. Meanwhile, Forbes Asia assessed Cowin's net worth as US$1.7 bn in 2019; and he was ranked as the 23rd richest Australian by net worth.