This year’s Forecast evaluation report looks at the latest data for 2014-15 – five years on from our first forecast in June 2010. Lower-than-expected nominal GDP growth explains much of the error in our borrowing forecast from then, but receipts were weaker still. As a result, our borrowing forecast was £60 billion too optimistic, but more recent forecast errors have been much smaller.
"It is the duty of the Office to examine and report on the sustainability of the public finances"