Abstract
Abstract The Internal Rate of Return (IRR) is a commonly used indicator of the performance of Private Finance Initiative (PFI), schemes in the UK. Treasury guidance recognises, however, that IRR is potentially misleading, unless the relevant payment streams are of a flat, annuity, type. This paper uses data on a number of actual PFI schemes to examine whether the payment streams involved are sufficiently flat for IRR to be a reliable indicator. There is clear evidence that the assumption of flat payment profiles in PFI schemes is violated. As a result, quoting IRR alone in the PFI context is liable to understate both the true opportunity cost of PFI finance to the public sector, and the potential scale of private sector profit. Our analysis also indicates that a statistic based on average outstanding debt is a reliable indicator of the extent of departures of the relevant payment profiles from annuity type.
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