Some young people could see reductions to the benefits they are entitled to, under a radical overhaul of the system to be recommended by a government-commissioned review.
Alan Milburn's year-long report, which will be published on Tuesday, will recommend moving under-25s off the main sickness and disability benefits, the Times reported, external.
Milburn, a former Labour health secretary, has been tasked by the government with helping reduce the one in eight 18- to 24-year-olds in the UK who are not in education, employment or training - or "Neet".
He said on Wednesday night that his plans would not be "pain-free" and would affect both existing and new claimants.
His report is expected to recommend that under-25s are no longer able to claim the health element of universal credit or personal independence payment (Pip).