The Chancellor has announced £820m of funding to guarantee paid work placements for 18 to 21-year-olds "not earning or learning" for over 18 months.
The funding will pay for three years of the Youth Guarantee scheme offering young people in England an apprenticeship, training, education, or help to find a job.
Latest figures show almost a million young people not in education, employment or training - known as Neets.
Making her Budget speech on Wednesday, Rachel Reeves said the money would "give the young people who were let down by the Conservatives the support and opportunity they deserve".