MADISON, Wis. (AP) — The federal health care overhaul signed into law last year will drastically cut the number of uninsured Wisconsin residents by 2016 but will drive up premiums for some customers and could cause some companies to drop coverage for their employees, a report released Wednesday found.

Former Democratic Gov. Jim Doyle's administration hired Massachusetts-based Gorman Actuarial, LLC, and Massachusetts Institute of Technology economist Jonathan Gruber last year to study the effects of health care reform on Wisconsin markets. The state used federal planning grants to pay for the report.

According to the study, the changes will result in a 65 percent decrease in the number of uninsured people in the state, from 520,000 now to about 180,000 by 2016. The report attributed the drop to mandates that people purchase health insurance and tax credits to offset the cost of premiums and make insurance more affordable. The mandates are among key aspects of the overhaul being challenged in court. If the mandates are repealed, only about 62,000 people would gain coverage, the report projected.