According to the UK government, one of the key features of the Private Finance Initiative (PFI) is the scope it provides to transfer risk to private sector suppliers. Under the PFI, public bodies are expected to develop interdependent relationships with suppliers that allow risk to be transferred. However, it is the argument of the author that it will not always be possible for interdependent relationships to be engineered by public bodies – on many occasions, public bodies will find themselves asymmetrically locked-in to their supplier. This situation leads to private sector suppliers becoming dominant in those relationships which, in turn, will allow them to pass back risk and obtain greater returns. As a result, the author argues that it is not a question of whether risk can be transferred under the PFI, but when. This argument is illustrated by use of the contracts managed by the UK National Savings and Investments and the UK Lord Chancellor's Department.