The Senate's latest tax plan would lavish billions of dollars in tax cuts on the wealthiest Americans but leave those at the bottom of the income ladder with higher taxes.

That's what the latest estimate shows from the Joint Committee on Taxation, released Thursday as the House was set to vote on a separate version of a tax overhaul.

Under the Senate plan, all income groups would get big tax cuts early in the coming decade, according to the committee's estimates.

But by 2021, households making $10,000 to $30,000 would see their taxes go higher than if Congress did nothing.