Can you do Roth conversions in your 401k? Or if not, in service withdrawals?
Assuming you're talking about aftertax aka megabackdoor Roth 401k contributions, the prevailing sentiment is contributions to those can be withdrawn as Roth principle contributions once rolled into an IRA.
So if you do $30k in megabackdoor Roth 401k over the next say 5 years, once you leave your employer and roll to an IRA you can withdraw $150k of the Roth principle without any penalties as part of your withdrawal plan (similar to Roth IRA contributions). Effectively this converts all the growth to Roth and avoids capital gains on it, but locks it up to 59 unless you pay penalties.
are you maxing your pre-tax 401k now?
What is your highest tax bracket?
I thought that you still had the same limits total between pre and post tax 401k, so would have to give up the tax break to put more into the post tax 401k.
This is only true if OP is referring to Roth elective deferrals. Assuming they are referring to after-tax contributions, those can be made per 401k up to a total of elective deferral, match, and aftertax up to $66k in 2023 ($69k in 2024).
let me check my uncerstanding here, so in 2024 401k limit is 23k, catch up is 7.5k, and say employer match is 10k. So that is 40.5k into pretax 401k.
Are you saying a person could also have 28.5 go into your employers plan as post tax roth contributions??
Yes, assuming the plan allows in plan conversions (most allowing aftertax contributions do, otherwise aftertax contributions are worse than taxable investments because the gains become traditional IRA).
In 2024, I am planning on contributing $23k elective deferral, receiving $13.8k match, and will put $32.2k into megabackdoor Roth.
Something interesting to note, the $69k 401k total limit is per
unrelated 401k so if I wanted to put $69k into my current 401k between those three sources and change jobs I'd be able to contribute more in my next 401k above $69k/year.
For example in 2021 I changed jobs and contributed a total around $75k between two 401ks, because when I joined my company I did megabackdoor Roth all the way to the $58k limit. I'd also contributed around $17k total at my first company 401k between all those sources. The elective deferral limit is per person, per year, but the total plan limit is per unrelated plan per year.