I'm planning on starting MBR, but I'm really on the fence about whether to do in-plan rollover to 401k Roth, or roll out to my Roth IRA. My plan supports both, but in-plan is far more streamlined. Vanguard makes it dead simple to execute automatic same-day conversion; I set it up once, and forever after my after-tax contributions are converted to Roth 401k the same day they hit my account.
If I roll out to my Roth IRA, I have to make a phone call to Vanguard each time. There is no fee to do this, but calling Vanguard CS ~26 times a year isn't super appealing.
Of course I could roll out less frequently, but I'm wary of the complications of those converted funds that may have earnings. I don't have a traditional IRA and don't really feel like setting one up (looks like it would require $1,000-$3,000 to set one up at Vanguard, and I don't qualify for a deductible IRA). So rolling out earnings into a traditional IRA and contributions to Roth IRA isn't a great option.
My hesitancy about rolling earnings into Roth IRA isn't so much about paying ordinary income tax on those minimal earnings. It's more about wanting to avoid making my future life more complicated. I'll have to keep track of up to 26 different conversion amounts (and the associated earnings, if any) per year. It could end up being hundreds of conversions over the next 10+ years. It's unclear to me whether I'd ever have to detail any of this information on an IRS form; maybe if my withdrawals never exceed my original contributions before I'm 59.5, then it's nothing to worry about?
The main point in favor of the after-tax going to Roth IRA is that I have access to it while I'm still working. That could end up being super useful should I continue working at my current employer for quite a while longer, which is a distinct possibility.
For those who have studied or executed MBR, do you have any insight or advice? Am I imagining that the consequences of mixed contributions/earnings is more complicated than it really is? Should I consider making things easier in myself by just converting once or twice a year?