Uncle Sam has thrown open the door for tax-free savings to more people than ever before. For 2010 and beyond, the $100,000 income limit to qualify for a Roth IRA conversion has been lifted, making everyone eligible to convert to a Roth. There's an extra sweetener, too -- make the switch in 2010 and you can choose to split up the tax bill. How much do you know about the rules for Roth conversions? Test your knowledge.

By Rachel L. Sheedy