This calculator can help you decide on whether to use a traditional IRA or to convert to a Roth IRA.
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Source of taxes due on conversion: if you select funds outside your
IRA, an amount equal to the tax due is added to the non-sheltered
account corresponding to the regular IRA.
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Contributions can be higher than the IRA limit. The calculator will put
as much as possible into each IRA, and put the excess into a
non-sheltered account.