The watchdog said spending overruns average more than €2 billion a year and urged larger surpluses, tighter ceilings and more saving from corporation tax receipts.
On Tuesday, the Irish Fiscal Advisory Council warned that the Government's proposed Budget 2027 package is 'larger than appropriate,' with Chairperson Seamus Coffey cautioning that actual spending will likely exceed what is announced on Budget Day.
Spending overruns have become 'routine and have repeatedly pushed spending above budget-day plans,' IFAC noted, averaging more than €2 billion annually over the past decade since 2013.
Ireland faces significant spending pressures of €8 billion in 2027 from an ageing population and inflation; the Council noted that €7 out of every €8 collected in corporation tax would be used for ongoing commitments.
To protect public investment, Coffey argued that Ireland needs its own domestic budgetary rule set out in legislation, as the current medium-term plan allows spending to grow faster than the economy's sustainable rate.
While the economy 'continues to perform well,' the Council advocates running larger surpluses and saving a greater share of corporation tax receipts; the Government is currently saving approximately €6 billion annually in dedicated future-proofing funds.