The government’s flagship welfare policy, Universal Credit, is to be introduced in 90 jobcentres in north-west England, Iain Duncan Smith says.
The work and pensions secretary told the BBC the change would apply only to single claimants, with couples and families joining at a later stage.
But ministers have not set a target date for that to happen.
The benefit is currently distributed at just 10 jobcentres, having been delayed a number of times since its creation.
Ministers say the changes will get under way next week.