The trust that runs the Royal Derby Hospital has lost out on tens of millions of pounds because of an accounting change.
The University Hospitals of Derby and Burton NHS Foundation Trust was expecting to receive a £59m pound end-of-year bonus from the NHS for hitting its financial targets.
However, a last-minute accounting change meant they suddenly missed the target.
The change relates to the sale of assets worth £101m.
The hospital is refusing to say what the sale was but filed documents at the start of April, suggesting a property transaction occurred between the hospital, its charity, and its commercial arm, involving five large pieces of land.
The trust is expected to reveal more details next month.