The Department of Finance said tax receipts, the main source of exchequer revenue, rose 3.2 per cent on the year to €78.8 billion in the 10 months to October. Tax receipts, the main source of exchequer revenue, rose 3.2 per cent on the year to €78.8 billion. [ Exchequer revenue could decline over next 40 years under scenario in major new reportOpens in new window ]It said a fall-off in such receipts could lead to a decline in exchequer revenue over the next four decades, relative to the size of the economy. “Those projections, which I published on budget day, incorporated a substantial upward revision to revenues, mostly on corporation tax. The corporation tax figure for October alone was €1.13 billion, up 165 per cent on the year.