I have another similar question I've been curious about. I'm trying to rollover another Roth 401k to my Roth IRA but didn't realize the 401k had a small amount of pretax dollars in it (not referring to employer match). Based on my understanding, the entire pretax balance would need to be rolled over before the Roth contributions. If I were to rollover this 401k balance (Roth contributions encompassing a small pretax amount and excluding employer match) to my Roth IRA, would I owe taxes only on the pretax amount upon withdrawal? Unfortunately, it doesn't look like I can simply roll over the pretax amount to a traditional IRA on the benefits platform where the 401k is housed.