Any delaying of tough decisions by John Healey at the Budget is โ€œnot the right approachโ€, a leading economic think tank has said as it urged the Chancellor to raise some ยฃ8 billion in taxes to rebuild his halved fiscal buffer.

The Resolution Foundation called for the Budget on October 28 to hike taxes โ€“ including on pensioners โ€“ to plug the financial headroom that it predicted has dropped from ยฃ24 billion to as little as ยฃ12 billion because of the Middle East war, as well as to provide support targeted at those struggling most with the cost of living.

James Smith, chief economist at the think tank influential upon the Labour Governmentโ€™s thinking, told a Tuesday briefing: โ€œWe think thereโ€™ll be a pretty chunky deterioration in the public finances.โ€

He warned the Treasury against its apparent plan to defer key choices to next yearโ€™s spending review.

โ€œThe idea seems to be to sort of take this temporary hit to the public finances, which you can view as temporary if you think the war is going to be a temporary phenomenon, and say weโ€™ll take difficult decisions in the future, weโ€™ll not do anything all that major and have a sort of minimal fiscal event at the Budget.

โ€œAnd we think thatโ€™s really not the right approach because thereโ€™s really two big challenges that we need to face head on here.โ€

The first should be to help families through โ€œthe difficult winter aheadโ€, including through support with soaring energy bills for households where no one has an income of more than 24,000, he said.

But the foundation urged the Government not to extend the long-running fuel duty freeze, which it said disproportionately benefits high-income families, and to instead introduce small predictable increases.

The second priority should be rebuilding the Chancellorโ€™s fiscal headroom โ€“ the leeway against his day-to-day spending rules โ€“ to at least ยฃ20 billion through spending restraints and around ยฃ8 billion in tax rises, the think tank said.

Its proposals include a tax switch which would see employee national insurance cut by 2p and income tax rates go up by the same amount, hitting the self-employed, landlords and pensioners with taxable income.

That measure would raise around ยฃ6 billion in 2029-30, the Resolution Foundation said.

It also recommends closing capital gains tax loopholes to raise ยฃ4 billion by ending exemptions for the owners of assets when they die or leave the UK, and charging national insurance on partnership income such as for law firm partners, which would raise another ยฃ2 billion.

Mr Smith said: โ€œIf you wanted to set out how you would actually fund that higher defence spending, the sort of switch weโ€™ve proposed in the past of moving some tax from national insurance to income tax, increasing taxes on unearned income from not being an employee, that would be a way to make a serious dent in that.โ€

He added: โ€œWhat weโ€™re calling for today is a Budget that focuses up to our problems and doesnโ€™t push everything off into the never never.โ€

Meanwhile, Mr Healey has ruled out bringing capital gains in line with income tax rates, according to the Financial Times.

Capital gains tax is a levy on the profits made after selling investments or assets, such as second homes or shares.

The annual amount of profit taxpayers can make before owing tax is ยฃ3,000, with anything above this taxed between 18% and 24%, compared with between 20% and 45% for income tax.

Clean energy tycoon Dale Vince, who has previously donated millions to Labour, urged ministers to equalise the taxes and backed estimates that this could raise up to ยฃ14 billion per year.

The Treasury declined to comment.