Rishi Sunak has contrasted his "clear-eyed realism" with the "starry-eyed boosterism" of his Tory leadership rival Liz Truss, while she vowed to use a September emergency budget to "immediately" cut taxes.
The two candidates vying to replace Boris Johnson as prime minister continued to clash over their plans for the economy after the Bank of England warned this week that the UK would fall into the longest recession since the financial crisis, with inflation set to soar to more than 13%.
Sunak has argued that inflation must be brought under control before taxes are lowered, saying Truss's promised unfunded tax cuts would further drive up prices.
In an interview with The Times, the former chancellor said: "The priority for me is to not do things that make it worse and I think putting £40 billion plus and borrowed money into an economy that's seeing an inflation spiral does risk making it worse.
"It might be okay but I think it means taking a gamble with people's savings, their pensions, their mortgage rates, it's not a gamble I'm prepared to take so I don't want to make it worse."
He told the newspaper the British people deserved "clear-eyed realism and not starry-eyed boosterism".
But Truss said she did not accept the "inevitability of a recession" as she pledged to "immediately" cut taxes if she wins the race for No 10.
"Despite the Bank of England's stark assessment this week, I do not believe in resigning our great country to managed decline or accepting the inevitability of a recession," the Foreign Secretary wrote in The Sunday Telegraph.
"I would hit the ground running by bringing in an emergency budget, charting a firm course to get our economy growing in order to help fund our public services and NHS.
"I would use this to immediately tackle the cost-of-living crisis by cutting taxes, reversing the rise on national insurance and suspending the green levy on energy bills".
Truss wants to accelerate by six months her plan to scrap the national insurance hike, implementing the change within days of a September emergency budget instead of waiting until April in line with usual Treasury rules, the newspaper reported.
During a campaign visit to Solihull on Saturday, Truss told reporters: "What I'm about as a Conservative is people keeping more of their own money, growing the economy so we avoid a recession and the best way to do that is lower taxes, but also unleashing investment into our economy."
She hit out at Sunak's economic legacy as chancellor, saying: "Under the plans at present, what we know is Britain is headed for a recession.
"That is not inevitable, but we need to avoid that by making sure our economy is competitive, that we're encouraging businesses to grow and that we are keeping taxes low.
"Having the highest taxes for 70 years is not going to deliver that economic growth and it's leading our country to a recession."
The Foreign Secretary earlier insisted tax cuts, not "handouts", would help families with spiralling fuel bills this winter.
She told the Financial Times: "Of course, I will look at what more can be done. But the way I would do things is in a Conservative way of lowering the tax burden, not giving out handouts."
Responding to her comments, Sunak said: "It's simply wrong to rule out further direct support at this time as Liz Truss has done, and what's more, her tax proposals are not going to help very significantly people like pensioners or those on low incomes who are exactly the kind of families that are going to need help."
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