| Relationships | Role | Relationship Start | Relationship End |
| Westpac Banking Corporation | Parent | 6/30/2007 | |
| Westpac Banking Corporation | Parent | 6/30/1999 | 6/29/2007 |
| Westpac Capital Trust Iv | Subsidary | 6/30/2007 | 9/15/2016 |
| Westpac Capital Trust Iii | Subsidary | 6/30/2007 | 4/24/2014 |
| Westpac Capital Trust Iii | Subsidary | 8/14/2003 | 6/29/2007 |
| Westpac Capital Trust Iv | Subsidary | 4/5/2004 | 6/29/2007 |
| Westpac Capital Trust I | Subsidary | 6/30/1999 | 12/28/2004 |