Premiums would rise if a last ditch lawsuit by Congressional Republicans against the Patient Protection and Affordable Care Act is successful, a new study finds. 

The suit, which accuses the Obama administration of spending money that was not authorized by Congress, takes aim at the cost-sharing reductions (CSRs) that the Department of Health and Human Services have disbursed to insurers to lower the costs of the policies they offer to those with incomes below 250 percent of the federal poverty line. 

The CSRs are aimed at silver-level plans on the exchange. While a person who is making above the income threshold bears 30 percent of the cost of health care services if enrolled in a silver plan, those with lower incomes pay for a smaller share of the cost, ranging from 26 percent for those just below the threshold to as little as 6 percent for those with incomes below 150 percent of the FPL.