Just days away from a crucial vote on the GOP's tax overhaul package, The Tax Foundation and Committee for a Responsible Federal Budget have released new analyses breaking down the estimated cost of the bill.

By the numbers: The conservative Tax Foundation predicts the plan will increase the federal deficit by $1.47 trillion, or $448 billion when you factor in economic growth; while the group of budget hawks say it could end up costing $2.2 trillion, or $1.5 trillion including economic growth.

The bottom line: The wide range shows how imprecise the estimates are, but neither group thinks the tax bill is going to pay for itself.

Tax Foundation Analysis:

"The plan would significantly lower marginal tax rates and the cost of capital, which would lead to a 1.7 percent increase in GDP over the long term, 1.5 percent higher wages, and an additional 339,000 full-time equivalent jobs."

When fully implemented, the bill "would spur an additional $600 billion in federal revenues from economic growth."

Over the next decade, the cuts "would increase GDP by 2.86 percent over the current baseline forecasts."

"Overall, the plan would decrease federal revenues by $1.47 trillion on a static basis and by $448 billion on a dynamic basis."

Committee for a Responsible Federal Budget analysis: