It seems to me that there is nothing to demonstrate how to calculate the fed income tax on a roth conversion in 2010. Example: On Jan 2, 2010, IRA owner Bob converts his $500,000 regular fully deductible IRA to a Roth and incurrs a tax of $175,000 (35%). He has other W-2 income of $200,000. How do you calculate the tax on the conversion? What happens if there is a fed tax increase in the middle of 2010 raising the highest rate to 38 or 40 percent effective after he converted in 2010. Is Bob grandfathered for his Roth Conversion tax payment in 2011 & 2012?