Britain's Fiscal Reckoning:
Why Austerity 2.0 Will Fail Where It Failed Before

There is a particular brand of British political cowardice that dresses itself in the language of responsibility. It speaks of "difficult choices" and "living within our means," of "fiscal sustainability" and "intergenerational fairness." It invokes the spectre of the bond markets and cites the IMF. And it arrives, reliably, at the same destination: cuts to public services dressed as prudence, and stagnation sold as virtue.

This is the tradition into which the current Government's fiscal framework falls. The spending review that emerges this month — with its real-terms cuts to day-to-day departmental budgets, its freeze on capital investment, and its insistence on reaching primary balance by 2028 — does not represent a serious attempt to put Britain's public finances on a sustainable footing. It represents a political calculation dressed as an economic one.

The Structural Problem the Treasury Won't Name

Britain's fiscal situation is genuinely difficult. That is not in dispute. The Office for Budget Responsibility has repeatedly identified a structural deficit that is not explained by the economic cycle. Tax revenues have underperformed forecasts. Public debt service costs have risen dramatically with interest rates. And the demands on the state — from an ageing population, a creaking NHS, a crumbling infrastructure inheritance — continue to grow.

But here is what the Treasury's framing conspicuously omits: the structural weakness in Britain's public finances is primarily a revenue problem, not a spending problem. The UK collects significantly less tax as a share of GDP than comparable European economies — France, Germany, the Netherlands, Denmark — while attempting to provide broadly comparable levels of public service. This is not a sustainable position, and no amount of spending constraint will make it so.

"The spending review does not represent a serious attempt to put Britain's public finances on a sustainable footing. It represents a political calculation dressed as an economic one."

Consider the arithmetic. If Britain raised its tax-to-GDP ratio to the average of comparable Western European economies — not to Scandinavian levels, simply to the European average — it would generate approximately £90 billion per year in additional revenue at current GDP. That is not a trivial sum. It is the difference between managed decline and genuine fiscal sustainability.

What the Evidence Shows

The evidence on fiscal consolidation is now sufficiently extensive to be reasonably definitive. The International Monetary Fund's own research — notably the work of Olivier Blanchard and his co-authors — demonstrated that the fiscal multipliers used to justify austerity after 2010 were substantially underestimated. Cuts of the kind implemented between 2010 and 2019 did not simply reduce borrowing; they reduced growth, which reduced revenues, which required further cuts in a self-defeating cycle.

The UK's productivity performance over this period is the sharpest possible illustration. Britain's productivity growth between 2010 and 2023 was among the weakest of any advanced economy. The causes are multiple and contested, but the systematic underinvestment in infrastructure, skills, and research capacity that characterised the austerity period has attracted a strong consensus as a significant contributor.

The Investment Gap Is Structural, Not Cyclical

Perhaps most damaging is the effect of austerity on public investment. Capital spending is always the first to be cut — it is politically easier to defer a hospital rebuild than to reduce a pension — and the compound effects of that deferral are now visible across the public estate.

RAAC concrete in schools. Victorian sewers in our cities. Court buildings that are literally falling apart. A prison estate that cannot house the people our courts send to it. These are not abstract fiscal statistics. They are the physical manifestation of two decades of underinvestment, and they impose real costs on the economy — in reduced productivity, increased maintenance expenditure, and the simple degradation of the quality of public life.

The Political Economy of Constraint

So why does the Government persist? The answer, I think, lies less in economics than in political economy — in the specific incentive structures that shape the choices of those in power.

Fiscal consolidation of the kind currently being pursued serves several political functions. It demonstrates "credibility" to financial markets, even when that credibility is largely performative. It constrains the policy space of future governments, which serves obvious partisan purposes. And it shifts responsibility for service deterioration from politicians to abstract fiscal necessity — from choice to fate.

None of these are good reasons to pursue policies that the evidence suggests will damage Britain's long-term economic capacity. But they are recognisable reasons, and understanding them is the first step to challenging them.

What Should Be Done Instead

The alternative to austerity is not profligacy. It is a coherent growth strategy built around public investment, a credible medium-term plan for revenue adequacy, and a genuine commitment to the structural reforms — in planning, in skills, in industrial strategy — that could shift Britain's growth trajectory.

Such a strategy would require political courage of a kind rarely seen in contemporary British politics. It would involve honest conversations with the public about the relationship between taxation and public services. It would require resisting the episodic pressure of the bond markets and the editorial pages of newspapers whose proprietors have obvious interests in low taxation.

It would, in short, require a government that was willing to govern — rather than to manage decline whilst pointing at the previous occupants of office.

We do not, at present, appear to have such a government. That is the real fiscal reckoning.

Professor R. Hartley is Professor of Political Economy at King's College London and a former Senior Adviser to HM Treasury. This essay represents his personal views. He has declared no financial interests relevant to this piece.