A Little-Known ‘Back Door’ Trick for Boosting Your Roth Contributions - WSJ

An additional after-tax contribution to your 401(k)—now allowed in the plans of many large employers— can grow tax free if it’s moved to a Roth account.
Article Fri, Jul 09, 2021
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An additional after-tax contribution to your 401(k)—now allowed in the plans of many large employers— can grow tax free if it’s moved to a Roth account.