Britain's debt squeeze tests the pound’s power

As European nations grapple with rising borrowing costs and stagnant economic growth, the United Kingdom confronts a challenging fiscal balancing act. Despite possessing its own currency and an independent central bank, the UK grapples with substantial public debt, increasing debt servicing expenses, and dwindling fiscal maneuverability.

The question arises whether the sovereign currency confers a more resilient economic stance against shocks than nations like France, or if escalating government bond yields reveal the extent of monetary sovereignty even for currency-issuing countries.

Chancellor of the Exchequer John Healey has chosen to utilize a portion of the government’s fiscal flexibility to cushion the economy against external disturbances, rather than implementing drastic tax hikes or spending reductions. Nevertheless, he concedes that mounting borrowing costs have rendered it more difficult for the government to adhere to its fiscal guidelines.

According to the Office for Budget Responsibility (OBR), the government’s anticipated fiscal flexibility against its current surplus objective has contracted to £15 billion in the 2029–30 fiscal year, down from roughly £24 billion in its March projections. It is anticipated to rebound to £22 billion for the 2030 financial year. This flexibility does not signify discretionary funds at the government's disposal; rather, it represents the gap between fiscal projections and the minimum surplus requisite to satisfy the government’s fiscal rule, with decelerating growth or heightened financing costs capable of swiftly depleting this flexibility.

The OBR estimates the likelihood of meeting the present surplus rule at merely 56%, a decline from 59% in the 2025 budget, underscoring the uncertainty surrounding the government's projected fiscal condition.

Moreover, the Bank of England’s quantitative tightening strategy contributes to the costs of reduced fiscal headroom. Since 2022, the central bank has been progressively diminishing its bond holdings acquired under its earlier quantitative easing program. With interest rates on the rise, the income the bank receives from commercial banks’ reserves has amplified, at times surpassing the earnings generated by certain bonds in its portfolio.

Furthermore, the bank has encountered losses from selling bonds at a price lower than their redemption value. An indemnity arrangement between the bank and the treasury absorbs these losses, placing additional strain on public finances and leaving the budget increasingly susceptible to fluctuations in interest rates and bond yields.

Despite these challenges, the government anticipates a gradual decline in borrowing. Public sector net borrowing is projected to dwindle from roughly 4.4% of GDP in 2025–26 to 1.8% in 2030–31, where it is expected to remain in 2031–32. However, this reduction in annual borrowing does not necessarily equate to an immediate or proportional decrease in the accumulated debt.

The OBR projects that public sector net debt will peak at 97.3% of GDP in 2028–29 before decreasing to 95.6% in 2031–32. Conversely, public sector net financial liabilities are forecasted to attain 83.8% of GDP in both 2027–28 and 2028–29, subsequently easing to 81.7% in 2031–32. These divergent trajectories underscore the significance of distinguishing between various measures of public indebtedness.

Merely curbing the annual deficit is insufficient to diminish the accumulated debt burden, especially when growth remains sluggish and financing expenses remain high.

The trajectory of economic growth proves pivotal in determining the efficacy of the government's fiscal blueprint. The OBR forecasts 2026 GDP growth at around 1.25%, while lowering its 2027 projection to 1%, a half percentage point below its preceding estimate. This downward revision stems from higher energy prices and borrowing costs, which are dampening consumption and investment.

Moreover, escalating inflation exacerbates the outlook. Consumer price inflation soared to 3.5% in the 12 months leading up to September, up from 3.1% in August, primarily attributable to higher fuel and utility expenses. The OBR projects inflation to average around 3.4% in 2027, peaking at approximately 3.8% early in the year before retracting to 2% throughout 2028.

Furthermore, heightened energy prices diminish households' real disposable income, escalate government spending on welfare benefits and pensions, and elevate the cost of inflation-linked government bonds. The OBR warns that real disposable income per person will decline in the near term, with the projected level in 2030–31 falling below its March estimate.

Consequently, the government must reconcile competing priorities, including curbing expenditure, safeguarding households and public services, and evading measures that could further stifle growth. If economic performance proves weaker than anticipated, tax revenues could wane, and the residual fiscal headroom could dissipate before the deadline for fulfilling the fiscal rule.