UK fiscal strategy tests bond market tolerance under Burnham plans

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UK fiscal strategy under Burnham

Highlights

Bank of America economists estimate the margin for meeting the UK's fiscal rules has shrunk to £19 billion by 2029/30, down from the Office for Budget Responsibility's previous £24 billion estimate.
Budgetary timing tactics could allow a Burnham government to delay fiscal consolidation beyond the mid-2029 election by leveraging rolling targets and deferred spending decisions.
CG Asset Management maintains a defensive position on UK government bonds, favoring short-dated and inflation-linked gilts due to inflation concerns and fiscal strategy uncertainty under Burnham.

Budget constraints and timing options

As reported by Reuters, Burnham last week commits to keeping fiscal rules that require day-to-day spending to be matched by revenue, while still promising broader economic change. He has not yet explained how he will reconcile those limits with spending demands, borrowing pressures and Labour's 2024 manifesto pledge not to raise taxes on working people.

In March, the Office for Budget Responsibility estimated that Rachel Reeves' plans would meet the rules with a current budget surplus of 24 billion pounds by 2029/30. But that forecast is based on economic assumptions from before the war in the Middle East, and Bank of America economists last week estimate the margin has narrowed to 19 billion pounds.

That shrinking headroom raises the possibility of delaying tougher fiscal decisions into later years. Bee Boileau of the Institute for Fiscal Studies says it is plausible a Burnham government could promise future fiscal consolidation while adding to spending in the near term, even though Reeves' reforms, including two-year spending reviews, make such rule management harder.

A possible route would be an initial Budget this year that broadly keeps existing plans and meets the balanced current budget rule in 2029/30, followed by a more defining Budget in 2027. From April 2027, the rolling three-year target shifts to 2030/31, potentially allowing consolidation to be pushed beyond the next election, due by mid-2029 at the latest.

A spending review due next year could complicate that approach because it requires departmental budgets to be set for the post-election 2030/31 financial year. For a pre-election Budget in 2028, Burnham could again move consolidation back to 2031/32, without specifying detailed cuts for a year outside the scope of Spending Review 2027 departmental budgets.

Investor caution and gilt market implications

Bond investors say formal compliance with fiscal rules may no longer be enough to reassure markets. Emma Moriarty, portfolio manager at CG Asset Management, says gilt investors are judging British debt against a crowded sovereign bond market where competition for buyers remains intense.

Some advisers argue Britain still has room to borrow more, particularly for infrastructure spending that the fiscal framework would permit. Jim O'Neill, a former government minister and former Goldman Sachs chief economist who has recently advised Burnham, has supported that view, but Moriarty says markets are likely to focus more on the overall volume of borrowing than on its stated purpose.

Boileau also warns against allowing the fiscal buffer to shrink too far, saying the Iran war has likely already reduced it. She argues governments need room to absorb shocks without being forced into abrupt policy changes after small forecast revisions.

For now, CG Asset Management says it is maintaining a defensive stance on British government bonds, preferring short-dated and inflation-linked debt over long-dated conventional gilts. The positioning reflects concern about inflation risk and the potential for a negative market reaction to fiscal developments under a Burnham government.

In our earlier coverage of Andy Burnham’s push for a clearer pro-growth agenda within Labour, we outlined how Britain’s weak productivity and stagnant real wages are intensifying pressure on the party to prioritise faster expansion. We also noted criticism that Labour risks diluting growth by elevating competing goals and by focusing on “good” and more evenly distributed growth, including proposals that could weaken key innovation clusters rather than reinforce them.

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