Labour's promise to introduce measures to get the long-term unemployed and under-25s into work would last throughout the next Parliament, the party said.
Ed Miliband's party will promise to fund the package via a tax on bankers' bonuses and high-earners' pensions in its 2015 manifesto.
Last month the party confirmed reports that funding - also including the proceeds of restricting pension tax relief for high earners - was only in place for 2015/16.
Now it says the scheme - estimated on present claimant levels to cost £1.9 billion in its first year and £900 million a year thereafter - is affordable right through to 2020.
Under the scheme, under-25s on Jobseeker's Allowance for more than a year - two years for others - would have to take a taxpayer-subsidised job for six months or risk losing benefits.
More top news
Downton Abbey actress Joanne Froggatt is to star in a new ITV drama exploring the devastating cost of deceit.
It's been 12 years in the making but the spacecraft Rosetta's mission has finally come to an end. Here is what you need to know about it.
The boss of DreamWorks has hinted that a fifth Shrek movie is in the pipeline saying there is "more to come" from the franchise.