Where did you go to university? usa medical supply Meanwhile, for pre-Medicare retirees, the ACA's exchangesoffer tax credits to offset premiums costs for families withincomes between 100 percent and 400 percent of the federallydefined poverty guideline. That works out to an annual incomebetween $11,490 and $45,960 for an individual, and between$23,550 and $94,3200 for a family of four.