Budget game tests John Healey’s shrinking fiscal headroom

By Olivia Hart

John Healey will announce the autumn budget to parliament on 28 October; the Resolution Foundation expects available headroom to halve to about £12bn from £23.6bn. The interactive budget game presents that narrowing margin as the central test of the chancellor’s strategy.

How large is the fiscal buffer?

The government’s fiscal rules require day-to-day spending to match receipts by the end of this parliament. At the spring statement, Healey’s immediate predecessor, Rachel Reeves, left £23.6bn of “headroom” against those rules.

The source links that reduction to surging debt-interest costs as the war in the Middle East drives inflation and unsettles bond markets. Market thinking cited in the game puts the minimum at £14bn of headroom needed to avoid provoking a bond-market reaction.

That threshold sits above the Resolution Foundation’s £12bn projection, although the game names no investors or documents behind the estimate. In plain terms, forecast headroom falls below the level described as sufficient to calm bond markets.

Which spending promises compete for the buffer?

The game says Healey faces pressure to make room for three priorities:

• A cost-of-living support package.
• Higher defence spending.
• Financing Andy Burnham’s long-term priority to spread “good growth” to every postcode.

He must also raise enough money for services demanded by voters, keep taxes at acceptable levels and retain creditors’ confidence in the government’s ability to repay its debt. The source provides no package values, spending totals or implementation dates for the three new priorities.

That omission prevents a direct comparison between the proposed spending pressure and the projected £23.6bn starting buffer. In plain terms, the spending agenda is clear, but its price is not.

How does the game test policy choices?

Players begin in the red, mirroring the chancellor’s fiscal starting point. They must design policies while watching available headroom expand, shrink or turn negative after each decision.

The alerts track two forms of political response. One shows whether bond markets, which may reject the government’s assumptions, remain convinced; the other shows how opinion polls react to the emerging package.

Players also receive Treasury briefings through a chart icon. Wry notes from Andy Burnham appear through a note icon when guidance is needed.

Success requires balancing the books while keeping backbenchers satisfied and avoiding a bond-market backlash. In plain terms, the game tests political and financial credibility at the same time.

How reliable are the estimates?

HM Revenue & Customs supplies the core fiscal impacts used in the game. Estimates of income from individual measures and the current government balance come from various economists, thinktanks and the government’s own assumptions.

Estimates for other measures appear in their descriptions. These projections often depend on assumptions about future growth, inflation, collection rates and other variables that may not materialise as forecast.

The methodology warns: “So this game should be seen as illustrative of the relative sizes of the impacts of measures.” It also advises readers not to buy or sell gilts based on the game.

The figures can compare the scale of different policy choices, but they do not constitute a complete budget forecast. In plain terms, the estimates indicate relative costs rather than a guaranteed market outcome.

Healey’s 28 October package will face the same three tests presented in the game: funding priorities, limiting political damage and preserving market confidence. The game cannot determine whether the available measures can close the gap between projected headroom and investors’ warning threshold.