The tax bill passed by the Senate in the wee hours of Dec. 2 will – if it becomes law – widen the gap between the rich and the poor at a time when income inequality is already approaching historic heights.

Initially, most U.S. households are likely to experience a modest tax cut under the Senate plan. However by 2027, the average family earning less than US$50,000 would pay about $250 more in taxes under the Senate plan, while the average family earning more than $1 million would experience a tax cut topping $8,000 a year, according to estimates from Congress’s own Joint Committee on Taxation.

Yet even those stark statistics understate the full impact of the Senate bill on long-term inequality in the United States.

In my own research, I examine the relationship between the tax system and inequality. In my view, there are two significant reasons why the bill’s impact will be even more dramatic – and even more regressive – than the Joint Committee on Taxation’s estimates suggest.

Read more at The Conversation