The UK's budget deficit swelled to £23.3 billion in May, the largest monthly shortfall since the height of the pandemic. The figure, released by the Office for National Statistics, adds fresh pressure on the Bank of England's monetary policy and could push up gilt yields, potentially diverting investment from riskier assets into fixed-income instruments.
Pressure on monetary policy
The £23.3 billion deficit represents a sharp increase from recent months and exceeds most economists' expectations. Borrowing is running well above the Office for Budget Responsibility's forecast, leaving the government with less fiscal headroom just as the Bank of England weighs its next interest rate decision. Higher government borrowing typically forces the central bank to consider tighter monetary conditions to prevent inflation from reigniting.
The deficit figure lands at a delicate moment. Markets had been pricing in rate cuts later this year, but a widening budget gap could delay that timeline. If the Bank of England keeps rates higher for longer, it will ripple through mortgage costs, business loans, and overall economic activity.
Gilt yields and the shift from risk assets
Investors are already repricing UK government bonds. The May borrowing data suggests more gilt issuance ahead, which tends to push yields up as supply increases. Higher gilt yields make fixed-income investments more attractive relative to stocks and other risk assets. That repricing is already visible: the yield on the 10-year gilt rose after the release, and analysts expect further upward pressure if the trend continues.
The shift matters for anyone with a pension or investment portfolio. A sustained rise in gilt yields could pull money out of equities and into bonds, dampening stock market returns. The impact is especially acute for growth stocks and technology companies, which rely on cheap borrowing and long-duration cash flows.
What the deficit means for the Treasury
Chancellor Jeremy Hunt had set a fiscal rule to get debt falling as a share of GDP by the end of the forecast period. The £23.3 billion hole makes that target harder to hit. Tax receipts rose but not enough to offset higher spending on welfare, debt interest, and public services. Debt interest payments alone reached £8.3 billion in May, the highest for that month on record, eating up a significant chunk of revenue.
The Treasury has limited room to respond. Cutting spending or raising taxes ahead of a general election is politically difficult. The opposition Labour Party has already seized on the numbers to argue the government has lost control of public finances.
Unresolved question for the Bank of England
The next Monetary Policy Committee meeting is in August. The deficit data gives hawks on the committee another reason to vote against rate cuts. But the economy is also showing signs of weakness, with GDP growth stalling in April. The Bank must balance the risk of keeping policy too tight against the risk of stoking inflation with loose policy.
Whether the deficit will force the Bank of England to hold rates steady through the summer remains an open question. The answer depends on June's borrowing figures, due next month, and on how global bond markets react to the UK's widening fiscal gap.
