The 10-year gilt yield ended last week near 5.33%, with markets pricing at least three Bank of England rate increases by April 2027. Strategists at UBS and HSBC say a smooth budget could take up to 20 basis points off it. September borrowing came in above forecasts.
Britain's bond market has spent October preparing for the worst. Going into Wednesday's budget, it is positioned for something closer to the best.
The yield on the 10-year gilt stood at about 5.33% at Friday's close. Investors have been buying gilts on the view that Chancellor John Healey will deliver a budget built on fiscal discipline, and Royal London Asset Management has said it is overweight 30-year gilts after what it called a year of repricing. Strategists at UBS and HSBC estimate that a budget the market receives smoothly could pull the 10-year yield down by as much as 20 basis points.
That is a meaningful shift in tone from September, when long-dated gilt yields set records and the debate was about how much headroom the government had left.
What the arithmetic still says
The fiscal numbers have not improved. Public-sector borrowing was £24.5 billion in September, above forecasts. Household energy costs are set to rise by about 16% from January, which adds to inflation pressure just as the Bank of England is weighing whether to tighten.
Markets expect it will. Pricing implies at least three quarter-point increases in Bank Rate by April 2027, with the first possibly at the Nov. 5 meeting. Consumer confidence fell 11 points in October, to minus 24, the sharpest monthly drop since early in the pandemic.
So the setup is a bond market leaning toward good news from the Treasury while the central bank is expected to keep raising rates. Both can be true at once: a credible budget would lower the premium investors demand for holding long-dated debt, even as short-term rates rise.
Where the asymmetry sits
The question for Wednesday is less what the budget contains than what has already been priced.
One reading is that gilts have already discounted a credible, disciplined package. If so, the rally that UBS and HSBC describe is largely in the price, and the larger move would come from disappointment: optimistic forecasts, accounting changes in place of tax or spending decisions, or a heavier borrowing plan than expected. Long-dated gilts would be first to sell off.
The other reading is that positioning remains light after a difficult year for the asset class, and that with the Bank of England expected to keep tightening, a merely neutral budget would be enough to let longer maturities rally further.
Both views rest on market framing rather than on anything the government has announced. The Office for Budget Responsibility's forecasts, published alongside the budget, will settle much of it.
A crowded Wednesday
The timing compounds the risk. British clocks went back over the weekend, so the Federal Reserve's 2 p.m. Eastern statement will land at 6 p.m. in London, hours after the chancellor sits down. A reported levy on banks has already weighed on British lenders. Gambling stocks are also seen as exposed.
Sterling, long gilts and U.K. bank shares will absorb both events in the same session. Across the Channel, France's bond market is running its own test this week, after Moody's left its rating unchanged on Friday on the assumption that a deficit-cutting budget passes.
What to watch
The budget and the Office for Budget Responsibility's outlook on Wednesday, the Debt Management Office's revised issuance plans, the Fed decision that evening London time, the European Central Bank on Thursday and the Bank of England's decision on Nov. 5.