Seven million pound increase since April
Tynwald members will be briefed on why there has been a £7 million increase in the capital cost of the proposed Liverpool landing stage.
In April the cost of the new facility - half a mile from the historic Pier Head site - was given as £31.3 million.
However, Tynwald will be told next week that the capital cost is now just over £38 million.
No explanation has been given as yet as to the reason for the rise.
Tynwald announces death of Douglas North MHK
Manx Utilities 'deeply saddened' by death of chairman
"Tynwald will be a less colourful place without John" says president
Douglas North MHK pays tribute to 'amazing friend'