Budget 2026: Four OBR forecasts lay bare Britain’s fiscal vulnerability

The headline reports that four forecasts from the Office for Budget Responsibility have exposed Britain's fiscal vulnerability ahead of the Budget 2026 announcement, with the underlying projections highlighting constraints on public finances. The transmission mechanism runs primarily through gilt markets: a perceived widening of the fiscal deficit or shrinking headroom against the government's fiscal rules tends to lift long-dated gilt yields as investors demand a larger term premium for holding UK sovereign debt. Sterling is exposed through the rate differential channel, since higher gilt yields can support the currency in the short term but also raise concerns about fiscal credibility that weigh on it if they are not matched by policy clarity. Long-maturity gilts and sterling-denominated rate-sensitive assets, including UK housing-linked and utility equities, are likely to be most sensitive to any repricing of the government's borrowing path. Traders should watch the Office for National Statistics public sector finances release and bond auction results over the coming weeks, as weak demand at gilt auctions would provide a direct read on whether fiscal concerns are being priced in

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