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I don't believe future tax rates will go down, rather up.
Roths are not all that great as you can't contribute much to them. Matching is the only factor that matters, if you get matching a 401 is worth it. Otherwise not. Most used to get matching and many still do. The main issue with 401k and later rolled over IRA money are the many limits, penalties and taxes on you handling that money.
401 k is good for employee match and also for most people who will not have income after they retire so lower tax bracket.
For high income, the top marginal tax rate is 37% on ordinary income, and the 3.8% Net Investment Income Tax (NIIT) often applies to IRA/401(k) withdrawals once your modified AGI is high.
So the top federal rate you’re likely to hit on big withdrawals is effectively:
37% federal income tax
+ 3.8% NIIT (if your MAGI is above the NIIT threshold)
→ ~40.8% total federal tax on the highest dollars (ordinary income)
California income tax
California taxes retirement distributions as ordinary income too, with a top marginal rate of 13.3% on taxable income above about $1,000,000 (plus a 1% mental health surcharge effectively included in that 13.3% figure).
So as a top earner in California, you may face:
up to ~40.8% federal
+ 13.3% California
→ ~54% combined marginal tax on dollars you pull from a traditional retirement account
Why didn't Grok mention the mega backdoor Roth?
The BIG trap: the pro-rata rule
This is where most people get burned.
The rule
When you convert any Traditional IRA money, the IRS looks at ALL your Traditional, SEP, and SIMPLE IRAs combined.
You cannot isolate just the after-tax dollars.
Example (bad outcome)
You have:
$93,000 pre-tax in a rollover IRA
$7,000 after-tax contribution
Total IRA balance: $100,000
After-tax percentage: 7%
You convert $7,000:
7% is tax-free
93% is taxable 😬
Result: you owe tax on ~$6,500
The correct mechanism: a Roth conversion
What does work is a Roth conversion, which is not a contribution.
How a conversion works
Money moves directly from:
401(k) → Roth IRA
The converted amount is:
Included in taxable income
Not subject to contribution limits
You can convert any amount, even millions
Key rule
Converted money must move directly from the pretax account into the Roth.
If you take possession of the money first, it’s no longer a conversion.
Why didn't Grok mention the mega backdoor roth?
Yes, I did get some matching, but it wasn't huge, a couple thousand dollars per year.
Now it feels like it was just bait to get me to trap my stocks where they would be taxed at the maximum rate rather than the capital gains rate.
I think there is something wrong with the GROK analysis. It ignores compounding in the tax free 401k (after a while, compounding is like jet fuel on the savings). The 'after tax' money outside of 401k is taxed on investment returns but not inside the 401k.

I can't speak for GROK, but don't make it sound like we are all illiterate because we never took advantage of the MBR.
You are in a small and lucky club in that you CAN do one and make enough money to do one.
Trust me, when I first learned about the MBR I couldn't wait to do my first one.
However, it's plan dependent. I worked for 3 fortune 50 companies and none of those fuckers had 401k plans that allowed for the mega backdoor roth. Sadly, I was never able to do one.
Always side hustle!
I think there is something wrong with the GROK analysis. It ignores compounding in the tax free 401k (after a while, compounding is like jet fuel on the savings). The 'after tax' money outside of 401k is taxed on investment returns but not inside the 401k.
Plus I will be in a lower tax bracket.
zzyzzx says
Plus I will be in a lower tax bracket.
That is what I thought as well. But thanks to inflation, I will be in a high tax bracket in a few years when I have to do the RMDs. I suspect the same will happen to you.
Outside of 401k, you would still be paying taxes on distributions as they are generated (lower compounding). Only the appreciation remains tax free until you cash out. Also, I believe California taxes capital gains as income, so the 15 or 20 percent is raised by your income bracket for state tax purposes.
zzyzzx says
Plus I will be in a lower tax bracket.
That is what I thought as well. But thanks to inflation, I will be in a high tax bracket in a few years when I have to do the RMDs. I suspect the same will happen to you.
You don't think the Guv has gamed out the Roths on the basis of life expectancies? They tend to be a null proposition unless you live to a pretty old age into a higher tax bracket, and then in your dotage it's not that great.
You can't really put that much into them without lots of up front tax liability. I don't know why people are so obsessed by them. Just plunk whatever spare after tax money you have into one to the allowable limit and let it grow for whatever it is.
You don't think the Guv has gamed out the Roths on the basis of life expectancies? They tend to be a null proposition unless you live to a pretty old age into a higher tax bracket
leaving me no room to do Roth conversions
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Grok:
When I started working, the capital gains rate was 28% or so, so the difference was not so great. I should have paid better attention.