This document summarizes key aspects of SMSF borrowing rules under sections 67(4A), 67A and 67B of the Superannuation Industry Supervision Act. It discusses the changes made by sections 67A and 67B, and compares them to the previous rules under section 67(4A). It also outlines several unresolved issues around concepts like the 'single acquirable asset' and the nature of holding trusts.