The health-care bill that Congress passed in March contained two surprising new taxes to help pay for the changes: an extra 0.9% levy on wages for couples earning more than $250,000 ($200,000 for singles) and a new 3.8% tax on investment income on those same people (technically, people with "adjusted gross incomes" above those amounts).

Each tax signals a radical change in policy. For workers, the extra 0.9% levy puts a progressive element in what used to be a totally flat tax. The 3.8% tax on investment income also knocks down a longstanding wall by applying a "payroll" tax to unearned income. Until now, FICA taxes for Social Security and Medicare have applied only to wages, not investment income.

While many details remain unclear and the Internal Revenue Service hasn't issued any guidance, here are preliminary answers to the most important questions taxpayers are asking.

These taxes take effect in 2013, two elections away. Might they be repealed first?

Not likely. "Congress would have to undo the health reform, and budget constraints would still be there," says Clint Stretch of Deloitte Tax. "Even if Republicans take control of Congress, President Obama holds the veto pen until Jan. 20, 2013."