Use the calculator at Roth Conversion Calculator to help you with your conversion:
Roth IRA Conversion with Distributions
If you are already retired, then the question is usually much less about the taxes as it is about distributions. Actually, its always about taxes, but distributions are a close second. The only reason to convert if you are already retired is this: You don't need the money that you are required to withdraw through Required Minimum Distributions (RMD).
To determine your RMD for a IRA or 401(k) or other qualified account, you can use the calculator at: Required Minimum Distributions Calculator
To stop the RMDs, you can convert to a Roth. But – you will be taxes on the current conversion immediately, which can increase your tax liability. Here is what you need to ask yourself:
Should I delay my tax bill to 2011 and 2012? Unless you are in the highest bracket (35%) this is probably a good option. Run your analysis both ways to make sure, but unless your tax rate goes up in 2011 and 2012, delaying works for you. The exception is if you know you will be in the top tax bracket for 2010, 2011 and 2012. Currently the top tax bracket is scheduled to rise to 39.6% in 2011. In this situation, paying your entire bill in 2010 might work to your advantage.
Should I convert only part? If it's a good idea to convert some, in this situation it's probably a good idea to convert all of it. But – make sure you can afford the tax payment. If you can't, or it's just too much of a stretch, maybe a partial conversion is a good option.
Try to run through multiple scenarios for the factors that affect your situation. Splitting your tax bill or not is pretty easy to test out. Predicting your future tax rate? This is much more difficult. Now try it all again with only half of your balances. One point of all of this I want to make clear: The harder something is to predict, the wider range of potential outcomes you need to plan for. So, mix it up! Run your scenarios and compare the results and decide for yourself: Should I Convert to Roth?
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