UK borrowing costs jump, stocks slide as speculation mounts over high-stakes budget

British government bond yields rose sharply, with the 10-year gilt climbing to 4.51%, and UK equities declined after reports indicated Finance Minister Rachel Reeves abandoned plans for a significant income tax hike, opting instead for a "patchwork" of smaller tax increases to address a £30 billion budget deficit. Analysts warn this approach will likely increase government borrowing and exert further upward pressure on yields, noting that UK long-term borrowing costs are already at their highest since the late 1990s and are the most expensive in the G7, creating significant uncertainty for investors ahead of the Autumn Budget on November 26th.

Analysis

British government bond yields surged following reports that Finance Minister Rachel Reeves has abandoned plans for a significant income tax hike. The benchmark 10-year gilt yield rose 7 basis points to 4.51%, with longer-dated 20- and 30-year gilts also seeing increases of 8.5 and 9 basis points, respectively. This U-turn, aimed at addressing a £30 billion budget deficit through a "patchwork" of smaller tax rises, immediately pressured UK equities, with the FTSE 100 dropping over 1% and major banks like Lloyds, Natwest, and Barclays each losing more than 2.7%.

Analysts, such as Rory McPherson of Wren Sterling, warn that this fragmented approach will likely necessitate increased government borrowing, thereby exerting further upward pressure on gilt yields. The UK's long-term borrowing costs are already at their highest since the late 1990s and represent the most expensive in the G7, highlighting a challenging fiscal environment. Toni Meadows of BRI Wealth Management notes the government faces a "rock and a hard place" scenario, needing to promote growth while cutting spending and increasing taxes.

The market reaction reflects concerns about the government's broader economic credibility, as suggested by Julian Howard of GAM Investments, with the uncertainty surrounding detailed budget plans proving particularly damaging in the short term. While the Bank of England may still consider interest rate cuts post-budget, investor optimism for such cuts has notably curbed, with bets shedding six basis points. The Autumn Budget, expected on November 26th, is now a critical juncture for clarity and market stability.

Key Decisions for Investors

• Monitor the specifics of the Autumn Budget on November 26th for detailed fiscal plans and their potential impact on sovereign debt and interest rates.
• Evaluate exposure to UK government bonds, particularly longer-dated gilts, given the sustained upward pressure on yields and the UK's elevated borrowing costs relative to G7 peers.
• Consider potential continued volatility in UK equities, especially financial institutions like Lloyds, Natwest, and Barclays, as fiscal uncertainty and higher borrowing costs could impact their operational environment and profitability.
• Assess the implications of potential further tax changes, including those on pensions, ISAs, and capital gains, as these could affect investment strategies and consumer spending.