The long-term unemployed face having to earn their benefits with full-time unpaid community work from next year.
Chancellor George Osborne is to give details of tough new conditions being attached to unemployment handouts - pledging to end the "something for nothing" culture.
Claimants who go through the coalition's flagship Work Programme but still fail to find a job will be required either to do community work, report to a job centre daily, or undergo intensive treatment to tackle problems such as illiteracy or mental illness.
Those who break the rules of the Help to Work scheme, for example by failing to turn up for duty without a good reason, could lose their benefit for four weeks. A second offence would see them lose it for three months.
Mr Osborne will announce the US-style initiative, which is due to come into force in April, in his speech to the Tory conference in Manchester tomorrow.
He will promise that the Government will not "abandon" the long-term unemployed.
"For the first time, all long-term unemployed people who are capable of work will be required to do something in return for their benefits to help them find work," he will say.
"They will do useful work to put something back into their community making meals for the elderly, clearing up litter, working for a local charity.
"Others will be made to attend the job centre every working day.
"And for those with underlying problems, like drug addiction and illiteracy, there will be an intensive regime of help.
"No one will be ignored or left without help. But no one will get something for nothing.
"Help to work - and in return work for the dole. Because a fair welfare system is fair to those who need it and fair to those who pay for it too."