You can convert a regular IRA into a Roth if your income is $100,000 or less (and starting in 2010 the income restriction disappears), but you have to pay taxes on the sum being converted.
The silver lining: With the S&P off 20%, there's less to be taxed on today. If your IRA was entirely in an S&P 500 fund and you're in the 28% bracket, you'd pay $2,800 less to convert a $50,000 IRA now than you would have last fall.
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Last updated August 16 2008: 4:37 PM ET