There are caveats. Tax is not the Exchequer’s only income, and the headline balance is affected by transfers into Ireland’s two long-term savings funds. Ireland is not presently broke. Quite the opposite.
The problem is what is likely to happen when revenues stop being so ... supernatural.
Last year, after stripping out the once-off proceeds of the Apple tax case, Ireland collected €105.7bn ($122.9bn) in tax. Of that, €32.9bn ($38.2bn) came from corporation tax. Almost one euro in every three collected by the state came from this single source.
Even that understates the concentration. Foreign-owned multinationals paid 87% of corporation tax. The 10 largest payers supplied €18.6bn ($21.6bn) – 56% of all corporation tax and one euro in every six of all tax collected by the Irish state.
Ten Companies Supplying One-Third of the Tax
Ten companies, in other words, supplied one-sixth of the tax income of a sovereign country.
That is, from the Irish government’s point of view, as articulated to its own voters, an astonishing Irish economic success story. It is also fiscal insanity if the money is treated as permanent – which is exactly what is happening.
There is good reason to be deeply concerned: Ireland’s own Department of Finance describes the receipts as “volatile and unpredictable”, says that the "transitory element" cannot be relied upon indefinitely and acknowledges that without it there is an underlying deficit in the public finances.
The Irish Fiscal Advisory Council has put a number on that problem. It estimates that Ireland will record a headline general-government surplus of €9bn ($10.5bn) this year. Remove what it considers potentially transitory corporation tax, however, and that surplus becomes a deficit of €11bn ($12.8bn).
Both figures are true. The first makes Ireland look like one of Europe’s great fiscal success stories. The second says that an extraordinary tax windfall presently stands between the Irish state and a double-digit underlying deficit.
Reckless – But Within the Rules
The first figure is the one which, in practice, helps keep Ireland beyond the reach of meaningful European enforcement.
The European Union’s fiscal architecture was designed with a familiar villain in mind: the government that borrows too much and builds up unsustainable debt. Its reformed rules are more sophisticated than the old 3% deficit and 60% debt limits, and now also police net expenditure through medium-term national plans.
What the rules do not police effectively is a government that increases spending too quickly but happens, for the moment, to have a small number of multinational companies picking up the tab.
Brussels has noticed the danger. The European Commission has warned about Ireland’s concentrated revenues and explicitly recommended broadening the tax base.
But a warning is not the same thing as a rule.
Brussels Sees the Problem – But Cannot Act
The Commission calculated that Ireland exceeded its net-spending ceiling in 2025, with growth of 6.7% against a limit of 5.1%. The Fiscal Council’s estimate was higher again, at 9.3%. Yet the Fiscal Council says no enforcement follows while Ireland’s headline deficit remains below 3% of GDP and its debt below 60%.
For Ireland, those tests are particularly misleading. GDP is heavily distorted by multinational activity. The budget balance is meanwhile flattered by corporation-tax revenues which the Department of Finance itself says are unsafe to rely upon.
The danger therefore appears in the prose of European reports, but there is no mechanism to address it. Brussels can accurately describe Ireland’s vulnerability, but its rules still allow the country to pass the tests that matter.
That is how Europe may be surprised when a crisis comes – even in the case of a crisis it will have already predicted.
A Repeat of the Last Fiscal Crisis?
Consider the last Irish crash.
Between 2007 and 2010, annual tax receipts fell from €47.25bn ($54.9bn) to €31.75bn ($36.9bn) – a decline of 32.8%. Corporation tax then accounted for only about 13.5% of receipts, compared with 31% today.
Apply the same peak-to-trough decline to last year’s underlying tax take and annual revenues fall from €105.7bn ($122.9bn) to about €71bn ($82.5bn): an annual revenue loss of almost €35bn ($40.7bn).
This is not a forecast: the next downturn will not reproduce the last one exactly. It is, however, a stress test – and, given today’s much greater dependence on a small number of corporate taxpayers, perhaps a very generous one.
After all, a global recession impacting corporate profits is not unheard of: this week alone, there were further warnings that such a thing is possible. Tax rules mean that big companies can offset losses against future taxes, meaning that there is a scenario where the 10 companies bankrolling Ireland reduce their tax contributions to zero almost overnight.
For a crude sense of scale, €35bn is equivalent to roughly three-and-a-third months of last year’s total Exchequer spending. Closing such a hole through spending cuts alone would be the equivalent of the Irish state making no payment at all from around the third week of September until New Year’s Eve.
Ireland Says It Has Reserves – But Not on the Scale Needed
The Irish government does have some reserves: it can fairly point to the Future Ireland Fund, the Infrastructure, Climate and Nature Fund, and the cash reserves accumulated during the good years. These are substantial. But not nearly enough.
On present plans, the Fiscal Council calculates that between 2027 and 2030, €7 out of every €8 collected in corporation tax will be spent, with only €1 saved.
Ireland supposedly learned the relevant lesson after the “Celtic Tiger”: temporary revenues should not support permanent commitments. Back then, the collapse in taxes associated with property and consumption tore an enormous hole in the public finances. The revenues vanished; the commitments remained.
Europe’s Fiscal Rules Miss Ireland’s Unsustainable Surplus
This time the vulnerable revenues come from multinational profits rather than houses. The principle is identical.
Europe built its fiscal rules to catch unsustainable deficits after the last crisis. Ireland is demonstrating the danger of an unsustainable surplus before the next one.
If that crisis comes, Ireland may not have broken Europe’s rules at all. It will, however, have built the next crisis inside them.
