On Wednesday, October 14th, the yield on 10-year UK government bonds fluctuated around 5.4%, a significant increase from March, reflecting the continued rise in inflation expectations and financing costs due to the energy price shock triggered by the Middle East conflict. The Bank of England maintained its benchmark interest rate at 3.75%, and the market was highly sensitive to the subsequent policy path. The UK's consumer price index rose 3.1% year-on-year in August and is expected to climb further to around 4% early next year, while private sector wage growth slowed to 2.9% in the three months to July. Chancellor of the Exchequer John Healy will announce his first budget on October 28th. The £23.6 billion fiscal buffer projected by the Office for Budget Responsibility in March has narrowed due to rising debt interest rates, but a potential upward revision to wage growth forecasts could partially offset the pressure, becoming a key variable before the budget.

The upward revision of wage forecasts may alleviate fiscal buffer pressure.

The UK's Office for Budget Responsibility (OBR) projected in March that nominal wage growth would be 3.4% this year, falling to 2.4% in 2027, and further slowing to 2.1% in 2028. However, the energy shock has driven up inflation expectations, leading some economists to consider the forecast overly pessimistic. Economist Dan Hansen pointed out that the OBR's wage forecast "looks too low," posing a "significant upside risk" to the public finance outlook. He analyzed that a large upward revision is unlikely, but a moderate adjustment is "very likely," which could allow Healey to deal only with a minor deterioration in public finances, thus reducing the pressure to announce measures to correct the fiscal deficit. Ruth Gregory, deputy chief UK economist at Capital Economics, said that if the OBR adjusts its wage growth forecast to align with its own views, the fiscal buffer could be more than £8 billion higher. The Institute for Fiscal Studies believes that, in a reasonable scenario, income tax revenue could increase by about £9 billion compared to the March forecast. These estimates suggest that wage growth automatically boosts tax revenue through a fiscal drag effect, potentially providing Healey with a buffer and reducing the need for significant tax increases or spending cuts. Public sector borrowing reached £18.3 billion in August, exceeding expectations and further highlighting the importance of forecast adjustments.

The Second Round of Inflation Effects and Labor Market Assessment

The UK's Office for Budget Responsibility (OBR) needs to determine whether the energy shock will trigger a second round of inflation, i.e., whether workers have sufficient bargaining power to drive up wages. The Bank of England faces a similar assessment. Currently, the labor market is relatively weak, with the unemployment rate remaining at 4.9%, and private sector wage growth having fallen to its lowest level in recent years, indicating limited room for negotiation. However, the views of the new OBR Chairman, Jonathan Haskell, could influence this assessment. Haskell pointed out in 2023 that post-pandemic non-accelerating inflation could lead to a higher unemployment rate, implying a less-than-expected slack in the labor market, thus pushing up wage pressures. Deloitte's UK chief economist, Debblatim De, stated that sustained high inflation could drive up wages, one channel through which the government can achieve higher-than-usual revenue growth through fiscal drag, but this requires income to respond to inflation. Nick Riedpass of the Institute for Fiscal Studies also noted that the OBR has been pessimistic about wage growth in recent years, but higher inflation should, to some extent, be transmitted to nominal wages. This assessment will directly determine income tax forecasts, thus affecting the size of the fiscal buffer under the 2029-30 fiscal year's balance of daily expenditures and tax revenue rules.

Narrowing fiscal buffers and spending pressures coexist

In its March forecast, the government projected a £23.6 billion buffer to meet its daily spending balancing rules. However, since then, UK government bond yields have risen sharply, with the 10-year yield increasing by over 100 basis points from the beginning of the year, significantly increasing debt interest costs. Several institutions estimate the buffer has narrowed to between £11 billion and £12 billion, and could even turn into a deficit in an unfavorable scenario. The Institute for Fiscal Studies (IFS), in a reasonable scenario, indicated that considering higher borrowing costs and spending, the buffer might remain at around £20 billion, only slightly lower than in March, but changes in wage forecasts could cause fluctuations of around £10 billion. Besides wages, forecasts for immigration and housing construction could also influence the outcome. Healy's predecessor, Rachel Reeves, benefited from wage increases in last year's budget, partially offsetting the negative impact of declining productivity. Currently, inflation is eroding the real value of departmental cash budgets. The IFS estimates that maintaining actual spending on public services and meeting defense targets may require an additional £35 billion, posing a more significant challenge than the buffer itself. Healy needs to specify acceptable spending limits by October 28 to maintain the credibility of fiscal rules.

Frequently Asked Questions

Question 1: Why would an upward revision of wage growth forecasts directly improve the fiscal buffer? Answer: Rising nominal wages, through the fiscal drag effect, push more taxpayers into higher tax brackets, automatically increasing income tax and National Insurance revenue. The Institute for Fiscal Studies and Capital Economics estimate that a moderate upward revision could increase related tax revenue by £8 billion to £9 billion compared to the March forecast, offsetting some of the buffer erosion caused by rising debt interest. Question 2: How might Haskell's appointment as Chairman of the Office for Budget Responsibility (OBR) affect wage assessments? Answer: Haskell previously argued that post-pandemic non-accelerating inflation would result in higher unemployment, implying that the labor market is not as loose as data suggests, and workers have stronger bargaining power. This could prompt the OBR to revise wage growth forecasts upwards, thereby increasing expected tax revenue. Question 3: What does the current high yield on UK government bonds mean for the budget? Answer: The 10-year yield is hovering around 5.4%, a significant increase from March, directly increasing future debt interest payments. Several institutions estimate this has already narrowed the buffer from £23.6 billion, but the income effects of wages and inflation may partially offset this, ultimately depending on the OBR's overall forecast.