That's exactly what I have been doing... my tax rate will be low from now until I start my pension and SS so I have been doing conversion to the top of the 15% tax bracket and paying ~10% of the converted amount in federal income tax. It is less than 15% because before Roth conversions our income is principally qualified dividends and capital gains and those are less than our deductions and exemptions so a portion of the Roth conversion is taxed at 0%, a portion at 10%, and a portion at 15% and that averages out to ~10%.
You can get a good idea of the impact by modeling it out in Taxcaster or TurboTax.
Be aware though that if you do too much and exceed the top of the 15% tax bracket that the incremental tax is onerous... about 30%... but that can easily be overcome but recharacterizing any excess above the top of the 15% tax bracket. The past couple years I have done my tax return and then recharacterized an amount sufficient so my taxable income is exactly the top of the 15% tax bracket.
I-orp would have me convert much more but I don't see the wisdom in doing that... I'm just not a believer.
+1 to everything said, including the comment about I-orp. I'm using the same strategy but used tax software to model returns, including modeling conversions while delaying SS until 70 as well as start of RMD's, to end of PF life. Fortunately, I don't need the ACA so don't have to worry about that complication.
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