NewInvesting··9 min
The Backdoor Roth Is Simple. The Pro-Rata Rule Measures a Date You Weren't Watching.
Contribute to a traditional IRA, convert to Roth, done. That works cleanly only if your other traditional IRA balances are empty, and the balance that decides it is measured on December 31, not on the day you convert. Which means a rollover in November can retroactively tax a conversion you made in March.
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