The SNP will tomorrow demand extra powers for Holyrood on job creation, wages, taxation and welfare ''as early priorities" when the new Scotland Bill is debated in the House of Commons.
But unionist parties last night accused the SNP of running scared of its own economic policy after omitting full fiscal autonomy from its plan to beef up the Bill.
The Scotland Bill is meant to translate last year's Smith Commission on more powers into reality, giving Holyrood control of income tax rates and bands and some welfare benefits.
Tomorrow's second reading is the first chance for MPs to debate its main principles.
The SNP amendment for the debate says the Bill fails to implement Smith in full and falls short "of what people in Scotland want and what Scotland's economy and society needs".
Listing more powers to be included, it says the Bill "will require substantial amendment".
Although Nicola Sturgeon said during the General Election that SNP MPs would vote for full fiscal autonomy (FFA), which would see Holyrood control all tax and spending, there is no such demand in the SNP amendment.
Instead, there is simply a reference to Scotland moving "to a position in the medium term where the Scottish Parliament and Government are responsible for all revenue-raising".
The Institute for Fiscal Studies has claimed FFA would mean a Scottish deficit of almost £9 billion by 2020 because public spending would exceed tax revenue.
The Barnett formula, which gives Scotland £1,400-a-head more in public spending than the UK average, would also be scrapped under FFA.
Labour accused the SNP of "sprinting away" from its policy, while the Tories said the party was "cowering" from the implications of a standalone Scottish economy.
However, the SNP insisted that its priority was securing powers over welfare, jobs and the economy.
The party's Westminster leader Angus Robertson said: ''The Scotland Bill published by the UK Government is woefully lacking - failing to meet even the limited powers set out in the Smith Commission and falling far short of the aspirations of people in Scotland as expressed so firmly at the General Election.
"The Smith powers are widely seen as the bare minimum which should be delivered to Scotland and yet every party in the Scottish Parliament  - even the Scottish Tories - have backed the view of the cross-party Devolution Committee that the Bill as it stands simply doesn't measure up.
"It is abundantly clear that there needs to be substantial changes and improvements to bring the Bill up to scratch - and to deliver the powers people in Scotland want to see.
"As it stands, major powers over social security, the minimum wage and other key economic powers would remain in the hands of David Cameron and George Osborne - it is time these powers were delivered to Scotland to allow us to take real action to grow our economy and tackle poverty.
"Last month, people in Scotland spoke loudly and clearly in demanding substantial new powers and gave the SNP an unprecedented mandate to pursue them. Westminster must show it has listened to Scotland's voice and agree to these changes to strengthen the Bill."

However, the SNP was savaged by other parties for skating over full fiscal autonomy. The party advocated FFA in its October submission to the Smith Commission.
In a TV debate on April 8, the First Minister also said she wanted FFA "as quickly as the other parties agree to give it" and when Labour leader Jim Murphy asked "Would your MPs vote for it next year?", she replied: "Yes. I would vote for it."
The unionist parties seized on the comments in light of the IFS deficit figures, claiming swingeing spending cuts or tax hikes would be needed to patch the SNP's "black hole".
The SNP argued borrowing to cover deficits is a universal feature of modern economies.
The party's ardour for FFA has appeared to cool, with hints the Scottish economy would need to improve for many years before the "fiscal framework" was right for FFA.
Shadow Scottish secretary Ian Murray said: "The SNP promised in their manifesto to deliver FFA, but they have barely settled into their Westminster offices before abandoning it.
"The SNP know their policy would be a disaster for Scotland, they just won't admit it.
"FFA would mean a level of austerity even George Osborne wouldn't dream of, which is why the SNP are sprinting away from their own flagship policy."
Jackson Carlaw, deputy leader of the Scottish Tories, said: "It's no surprise to see the SNP cower from calling for FFA. Like the business case for independence, it's been exposed as full of flaws, and a set-up which would hit people and businesses in the pocket."
Scottish Liberal Democrat leader Willie Rennie added: "The SNP know their economic plans are bad.
"If they had the courage of their convictions they would have tabled an amendment mentioning FFA. Once again, when reality meets rhetoric, the SNP sidestep the opportunity to put their plans into play and instead carp from the sidelines."
The SNP insisted it wanted "full revenue-raising in the medium term" but its priority was securing powers over welfare, jobs and the economy.
"The other parties are trying to misrepresent the SNP position because they are determined to stop Scotland's parliament getting meaningful new powers," a spokesman said.