GOP tax bill would cost poor Americans $1,600 a year and boost highest earners by $12,000, CBO says WASHINGTON (AP) — The Republican tax bill approved by the House would cost the poorest Americans roughly $1,600 a year while increasing the income of the wealthiest households by an average of $12,000 annually. That's according to a new analysis released Thursday by the Congressional Budget Office. The analysis found that middle-income households would see a boost of roughly $500 to $1,000 per year.