How Andy Burnham could surprise UK markets this autumn

Burnham’s arrival has not unsettled markets

Andy Burnham’s arrival in Downing Street has produced a much calmer market reaction than his rise to the Labour leadership did only a few months ago.

UK government bond risk premiums remain contained, and investors appear to expect the new prime minister to avoid major fiscal disruption this year. The dominant view is that Burnham’s political ambitions will be constrained by two commitments: sticking to the fiscal rules and avoiding large increases in the main taxes.

That combination points toward a relatively modest Autumn Budget, with an emphasis on policies that are visible to voters but inexpensive and easy to implement.

Possible measures include lower bus fares, tax relief for the hospitality industry and a shift in some policy costs from electricity bills to general taxation. The latter could cost a few billion pounds, but it may also help reduce headline inflation if it coincides with a fall in the regulated energy price cap in October.

That would be useful at a time when the Bank of England remains highly sensitive to inflation pressures.

Fiscal room gives Burnham some flexibility

Burnham inherits several unresolved spending pressures from the previous government.

Planned real-terms cuts to unprotected departments in 2029 may cost around £6 billion to reverse. The recently announced Defence Investment Plan also contains an estimated £4.7 billion funding gap.

Those numbers are significant but not necessarily large enough to break the fiscal framework.

Changes prepared under outgoing Chancellor Rachel Reeves are expected to create roughly £16 billion of extra borrowing room against the current budget rule this autumn. That could offset part of the deterioration in official forecasts caused by higher borrowing costs and lower migration assumptions.

A modest package of tax increases could add further room. Several measures considered last year were never introduced, and a combination of smaller changes affecting banks, pensions and other areas could finance limited spending increases.

The most likely outcome therefore remains a blend of extra spending, targeted tax rises and a modest increase in borrowing.

Gilt issuance is still set to fall

Even with some fiscal easing, UK government bond issuance is expected to decline sharply this year.

The Debt Management Office plans to issue £246 billion of gilts, down from £304 billion in the previous fiscal year. That reduction matters because investors tend to focus less on the wording of fiscal rules and more on the amount of debt the government needs to sell.

Britain is also undergoing genuine fiscal tightening as frozen tax thresholds continue to raise revenue without formally increasing tax rates.

This relatively supportive issuance backdrop helps explain why markets have not reacted strongly to Burnham’s arrival.

Under a modest-budget scenario, the outlook would probably not change expectations for the Bank of England to resume rate cuts in 2027.

A larger investment push could change the market view

The first major source of surprise is capital expenditure.

Burnham has long supported larger social housing and infrastructure programs. The challenge is that the fiscal rule requires net financial debt to begin falling within three years.

The word “financial” creates some flexibility.

Investment made through loans or equity stakes can receive more favorable treatment because it creates financial assets as well as liabilities. That is why proposals such as regional housing banks and greater use of the National Wealth Fund may become important.

These structures can make public investment appear less damaging under the fiscal rules, but they still often require upfront government funding and additional gilt issuance.

That is what markets will ultimately watch.

Plans involving Thames Water or broader public control of infrastructure could provide an early indication of how aggressively Burnham intends to use these investment vehicles.

Welfare reform could lower gilt yields

A second potential surprise is welfare reform.

Welfare spending is taking a growing share of government expenditure, but efforts to reduce disability or pension benefits have previously triggered major political resistance.

Burnham has given little indication that he wants to challenge the Triple Lock, which raises the State Pension by the highest of inflation, wage growth or 2.5%.

Still, a credible reform package could be welcomed by investors if it meaningfully improves the long-term fiscal outlook.

The potential savings may be limited in the short term, but the political signal could matter. A government willing to make difficult welfare choices may be viewed as more serious about debt sustainability.

That could lower gilt yields, particularly at longer maturities.

Property tax reform carries political risk

Property taxation is another area where Burnham may seek change.

Stamp duty is widely criticized because it discourages housing transactions, while council tax is still based on property values from 1991. Both systems are seen as outdated and inefficient.

But reform would create major political problems.

Replacing or reducing stamp duty could raise questions about people who have recently paid large amounts when buying homes. Revaluing council tax would produce clear winners and losers across regions and households.

It may also generate little or no additional revenue, limiting its value under the fiscal rules.

For that reason, a more likely first step would be an expansion of the mansion tax scheduled to begin in 2028 rather than a complete redesign of property taxation.

Raising the personal allowance would be expensive

Burnham may also consider raising the income-tax personal allowance.

The allowance has remained frozen at £12,570 since 2021. A 10% increase would cost the Treasury around £11 billion a year.

That would provide visible support to workers, but it would also weaken one of the main forces currently reducing UK borrowing. Frozen thresholds increase the effective tax burden as wages rise, generating significant additional revenue.

Reversing part of that process could cause investors to question the government’s commitment to projected deficit reductions.

One possible compromise is a tax switch: cutting National Insurance by two percentage points while raising income tax by the same amount. Because income tax covers a broader base, such a move could raise roughly £6 billion annually while leaving many employees’ tax bills broadly unchanged.

Even so, markets might still react cautiously if the overall package points toward higher borrowing.

Fiscal rule changes may eventually become unavoidable

The largest medium-term risk is a change to the fiscal rules themselves.

One option would be to exclude defence spending or selected investment from the borrowing limits. The government could argue that markets should distinguish between borrowing for day-to-day spending and borrowing for long-term assets.

Investors may accept that distinction in principle, but more borrowing still means more bond issuance.

That is the key market issue.

Fiscal rules matter only because they limit how much debt the government can issue. If the rules are changed in a way that permits substantially higher borrowing, gilt yields would probably rise even if the spending is classified as investment.

A major rule change is not widely expected in 2026, but it appears increasingly likely over the following years if Labour’s ambitions exceed the available tax and spending room.

A snap election remains the biggest wildcard

The most disruptive surprise may have nothing to do with the Budget.

A snap general election remains unlikely, but it cannot be ruled out. Betting markets place the probability at roughly 15% to 20%.

Labour currently holds a working majority of 166 seats, and opinion polls suggest it could lose nearly half of them if an election were held immediately. That makes an early vote look highly risky.

But Burnham recently won more than 50% of the vote in Makerfield, a constituency that might otherwise have gone to Reform UK. If his personal popularity spreads nationally, he may be tempted to seek a fresh mandate before it fades.

New prime ministers have often sought their own mandate. Theresa May did so in 2017, and Boris Johnson followed in 2019.

Burnham may also conclude that his policy agenda requires a full five-year term, even if an election produces a smaller majority.

Why markets may dislike an early election

A snap election would introduce two risks for investors.

If Labour won another majority, markets might expect a stronger mandate for higher borrowing and more aggressive public investment. If Labour failed to win, the result could create political paralysis or a weaker government.

Neither outcome would be especially positive for gilts or sterling.

The 2017 election also provides a warning. Theresa May entered the campaign with a strong polling position but lost the Conservative majority.

That history makes an election a dangerous strategy, which is why it is not the central scenario. But the probability may be higher than current betting-market odds suggest.