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
ITV News witnesses the young victims of the world's worst humanitarian crisis amid an outbreak of the greatest spread of cholera ever known.
Prince Philip's final public engagement as a royal before retiring will take place in early August, Buckingham Palace has announced.
Passengers have been escorted off the Oblivion rollercoaster ride at Alton Towers after it stopped at its highest point.