Part of the battle over health care reform is the lack of trust between the group. There are people who don't trust the government. There are people the government doesn't trust.
Both sides have their say in this post. The health care reform bill includes proposals for the IRS to check your eligibility for the programs. They don't trust some to fill out a form correctly and honestly, so all have to allow the government into their financial business.
Section 431(a) of the bill says that the IRS must divulge taxpayer identity information, including the filing status, the modified adjusted gross income, the number of dependents, and "other information as is prescribed by" regulation. That information will be provided to the new Health Choices Commissioner and state health programs and used to determine who qualifies for "affordability credits."
You can see why some are highly upset with that.