Prior to revealing plans to reduce the welfare cost, a Cabinet minister stated that benefit claimants who are judged physically capable of working will be punished if they decline employment chances.
According to Liz Kendall, individuals have a "duty" to participate in training or employment programs and will forfeit financial assistance if they choose not to.
The last Tory administration's pledge to cut the welfare spending by £3 billion over five years will be upheld by the Labour Government.
Under the previous government, welfare eligibility would have been tightened so around 400,000 more people signed off long-term would be assessed as needing to prepare for work by 2028/29 to deliver the savings.
If people repeatedly refuse to take up the training or work responsibilities, there will be sanctions on their benefits
Liz Kendall
Facing broadcasters on Sunday, Ms Kendall declined to reveal how specifically Labour will cut costs ahead of announcing a package of legislation next week, saying only the Government will introduce its own reforms.
The Work and Pensions Secretary told Sunday Morning With Trevor Phillips on Sky News: “If people repeatedly refuse to take up the training or work responsibilities, there will be sanctions on their benefits.
know, I'm very old, so I remember some of this.
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'The benefits system can incentivise and disincentivise work'
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“The reason why we believe this so strongly is that we believe in our responsibility to provide those opportunities, which is what we will do.
“We will transform those opportunities, but young people will be required to take them up.”
Ms Kendall said she believed “many millions” of disabled people and those with long-term health problems want to work, and “we need to break down the barriers to that happening”.
Asked whether some 400,000 people would ultimately be denied their current benefits, she told the BBC’s Sunday With Laura Kuenssberg: “I’m saying we will bring forward our own reforms. You wouldn’t expect me to announce this on your programme.
“But my objective is that disabled people should have the same chances and rights to work as everybody else.”
The latest official forecasts published by the Government show the number of people claiming incapacity benefits is expected to climb from around 2.5 million in 2019 to 4.2 million in 2029.
Last year there were just over three million claimants.
Ms Kendall will launch proposals on Tuesday designed to “get Britain working” amid Government concerns about the projected rise.
Her white paper is expected to include the placement of work coaches in mental health clinics and a “youth guarantee” aimed at ensuring those aged 18-21 are working or studying.
The Cabinet minister said the reasons for the increased number of claims are “complex” and that Britain is “an older and also sicker nation”.
She suggested some people have “self-diagnosed” mental health problems, but added there is a “genuine problem” with mental illness in the UK.
“I think there are a combination of factors here,” she said. “I do think we are seeing an increase in the number of people with mental health problems, both self-diagnosed – I think it’s good that stigma has been reduced – but also diagnosed by doctors.
“We’re also seeing more people in their 50s and above, often women, with bad knees, hips, joints. We’ve got a real problem with our health service.”
Asked whether she believes “normal feelings” are being “over-medicalised”, Ms Kendall told the BBC: “I genuinely believe there’s not one simple thing. You know, the last government said people were too bluesy to work.
“I mean, I don’t know who they were speaking to. There is a genuine problem with mental health in this country.”
It comes after Sir Keir Starmer used a Mail On Sunday op-ed to promise a crackdown on “criminals” who “game the system”.
The Prime Minister wrote: “In the coming months, Mail On Sunday readers will see even more sweeping changes. Because make no mistake, we will get to grips with the bulging benefits bill blighting our society.
“Don’t get me wrong, we will crack down hard on anyone who tries to game the system, to tackle fraud, so we can take cash straight from the banks of fraudsters.
“There will be a zero-tolerance approach to these criminals. My pledge to Mail On Sunday readers is this: I will grip this problem once and for all.”