The GOP plan to reform corporate taxes — which the Trump administration last week claimed could make Mexico pay for President Trump's border wall — would effectively charge companies 20 percent on their imports. To consumers, it would feel a lot like a hefty new sales tax on foreign-made products. And, like any sales tax, it would put the most strain on the poorest households.

Families at the bottom of the income ladder could pay 5 to 8 percent of their incomes as a result of increased prices from the Republican proposal, according to new calculations from Katheryn Russ, an associate professor of economics at the University of California, Davis. Middle-class families would pay between $700 to $1,000 a year, or about 1.3 to 2 percent of their incomes.

These charts show how the new tax would affect a range of American households. The highest-earning 10 percent of households would pay the most, because they buy the most. But since poorer families spend a larger share of their paychecks toward purchasing food, clothing and other necessities — which are often imported — the import tax would make a larger impact on their budgets.