An analysis by the Urban Institute of the proposed American Health Care Act (AHCA) indicates that changes to federal taxes and health care benefits would be regressive: that is, taking both tax reductions and benefit reductions into account, the average high-income family would be significantly better off and the average low-income family would be significantly worse off under the AHCA.
The analysis can be obtained at http://www.urban.org/sites/default/files/publication/89071/2001188-who-gains-and-who-loses-under-the-american-health-care-act_1.pdf.