this post was submitted on 19 Sep 2024
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[–] lunatic_lobster 2 points 1 month ago (1 children)

I largely agree with all the points made here however I think the overall message is a bit misleading. I would disagree that Roth investments are the preferred for long term investments. You aren't accounting for the opportunity cost of the taxes paid in the initial investment year. Those taxes, while small compared to what you will withdraw tax free are also losing out on 8x-ing themselves (as you would have invested that amount in a traditional tax advantaged account).

What this means is Roth is the preferable savings method if you are in a lower marginal tax rate than you expect to be in retirement. However traditional is better if you are in a higher marginal rate than you expect to be in retirement. If the marginal tax rate was the same when you invest and retire then the difference between Roth and traditional would be nil.

[–] UnderpantsWeevil 1 points 1 month ago (1 children)

You aren’t accounting for the opportunity cost of the taxes paid in the initial investment year.

If you're maxing out your contributions, it won't matter, except in so far as what you can earn on taxed income outside of the IRA account. That's going to be marginal relative to the contribution. And the compound returns inside the IRA make it meaningless.

What this means is Roth is the preferable savings method if you are in a lower marginal tax rate than you expect to be in retirement.

Unless you're going straight into a white shoe law firm or extraordinary paying tech job after you graduate, that's pretty much everyone. But even folks going into Fortune 500 companies typically start in the $60-80k/year range and climb up from there.

If the marginal tax rate was the same when you invest and retire then the difference between Roth and traditional would be nil.

The amount of money you have in the fund is going to be much larger.

Say I invest $5000/year up front and get a 10% return for 40 years. I'm looking at putting in $200,000 over that time and taking out $2.2M.

Assuming the tax rate is 25% for each of those years, I paid $50k in taxes to invest that initial $200k. But I get the $2.2M back tax-free.

If I put the $200k in tax-deferred, I have to pay $550k to get my balance out again.

Now, we can argue that I could put the $400/year in deferred taxes into a taxable savings account. And maybe we get clever by shielding that investment from taxation annually because we just shove it all in Microsoft or Berkshire B and let it ride. That nets me another $177k over 40 years, assuming the same rate of return (for which I'm still on the hook at 15% long term gains rate - so really only $150k).

The ROTH is $350k better. That's the whole reason the fund exists. It's another accounting gimmick to give wealthy people a stealth tax cut. Only suckers put their money in Trad IRAs.

[–] lunatic_lobster 1 points 1 month ago* (last edited 1 month ago) (1 children)

You seem to be using many different assumptions separately. In the first you assume you are maxing a Roth IRA (in my initial response I was also considering 401ks as many of them have Roth options nowadays). If you are maxing your Roth 401k and Roth IRA you are likely a high earner and therefore likely in a higher tax bracket than you will be in retirement. This means that kind of person will likely prefer traditional investments.

Your assumption there is someone maxing out their retirement options and in a relatively low tax bracket doesn't seem like reality. So in your math example they wouldn't be putting the extra in a taxable brokerage account but in the same tax advantaged account.

Quick edit: also I'm confused on the extra $400/year into taxable account. It should be $1,250 per year (25% of the 5,000) which would be closer to $600,000 before the capital gains tax.

[–] UnderpantsWeevil 0 points 1 month ago (1 children)

If you are maxing your Roth 401k and Roth IRA

You can't max both, you have to choose between them.

Your assumption there is someone maxing out their retirement options

The math doesn't change if your contributions are smaller. This is a game of percentages.

[–] lunatic_lobster 1 points 1 month ago

You definitely can max both a 401k and IRA you can also max an HSA. All these combined allow for an individual (not family) to save $34,150 (there are some edge cases I'm ignoring). Someone who can afford to save almost the US median salary amount is almost certainly going to have a higher benefit from traditional than Roth.

Also, the math completely changes if you aren't maxing because if you aren't maxing the contribution than adding more to the contribution gives you more tax advantaged investments (instead of taxable brokerage investments).