From the moment the Roth IRA was created in the late 1990s, it has been a popular vehicle to generate future tax-free growth and income, whether by contributing to the account on an ongoing basis, or even doing a Roth conversion of an existing IRA or other pre-tax retirement account.
Yet the caveat is that the decision to contribute or convert to a Roth IRA incurs an immediate tax liability. And in the extreme, a large Roth conversion can generate so much taxable income that it actually drives up the IRA owner’s tax bracket to the point that the transaction becomes wealth destructive!
Fortunately, though, the decision to do a Roth conversion doesn’t have to be “all or none” – and in fact, not only is a “partial” Roth conversion permitted, but in practice it’s often the optimal strategy, allowing retirement account owners to convert just enough to fill the lower tax brackets, without causing “too much” income that would trigger the top tax brackets.
In fact, the Roth recharacterization rules make it feasible to precisely fill the bottom tax brackets, but not a dollar more, by converting more than enough to fill the lower tax brackets each year, and then doing a partial recharacterization to back into the optimal partial Roth conversion amount after the year is over!