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re: Employer 401k vs Roth 401K

Posted on 5/20/26 at 9:39 am to
Posted by GoCrazyAuburn
Member since Feb 2010
41103 posts
Posted on 5/20/26 at 9:39 am to
You're taxed in buckets. So each dollar earned is taxed at the lowest possible rate, until you hit the next bucket.

For 178k income married/jointly filing, 32,200 standard deduct, taxable income 145,800.

First 24,800 is taxed at 10% - 2,480
24,800 to 100,800 taxed at 12% (76,000 * 12%) - 9,120
100,800 to 145,800 taxed at 22% (45,000 * 22%) - 9,900

Total Tax: 21,500

Effective rate: 21,500/178,000 x 100 = 12.08%. Changes if single or filing head of househould, but if jointly thats the number.
Posted by CenlaLowell
Alexandria, la
Member since Apr 2016
1304 posts
Posted on 5/20/26 at 9:44 am to
quote:

transferring a Roth to children after death is tax free

I never knew this Thanks for this information
Posted by TorchtheFlyingTiger
1st coast
Member since Jan 2008
3183 posts
Posted on 5/20/26 at 10:28 am to
Plug those numbers in here and you will get a great visual to better understand the taxes marginal rate and effective rate. Be sure.to select flow for a better visual depiction. Thanks to the.poster that shared this a few days back engaging-data.com/tax-brackets/
Posted by LSUFanHouston
NOLA
Member since Jul 2009
41081 posts
Posted on 5/20/26 at 1:07 pm to
quote:

The image is about a 12% effective ta


Effective rate is a garbage stat when it comes to tax planning

Marginal rate is what matters

The tax rate you paid on dollars already earned has nothing to do with the tax rate on the next dollar earned
Posted by TorchtheFlyingTiger
1st coast
Member since Jan 2008
3183 posts
Posted on 5/20/26 at 1:18 pm to
Delete
This post was edited on 5/20/26 at 1:21 pm
Posted by notsince98
KC, MO
Member since Oct 2012
22084 posts
Posted on 5/20/26 at 2:00 pm to
quote:

Effective rate is a garbage stat when it comes to tax planning


It matters a lot when running the numbers for evaluation.
Posted by LSUFanHouston
NOLA
Member since Jul 2009
41081 posts
Posted on 5/20/26 at 5:04 pm to
quote:

It matters a lot when running the numbers for evaluation.


Historical evaluation? I guess, but what use is that?

Future planning is what is important. If I go an additional X, what is my Y cost?

Everything else that makes up the effective rate is a sunk cost.
This post was edited on 5/20/26 at 5:05 pm
Posted by TorchtheFlyingTiger
1st coast
Member since Jan 2008
3183 posts
Posted on 5/20/26 at 5:30 pm to
Isn't effective rate useful to capture result of "If I go an additional X, what is my Y cost?"

Unless you assume the entire withdrawal falls in owners top marginal rate. Seems relevant to me when comparing withdrawal rate to tax rate on next dollar contributed at today's tax rate. Same for Roth conversion analysis.
This post was edited on 5/20/26 at 5:31 pm
Posted by LSUFanHouston
NOLA
Member since Jul 2009
41081 posts
Posted on 5/20/26 at 6:15 pm to
quote:

Isn't effective rate useful to capture result of "If I go an additional X, what is my Y cost?"


Absolutely not.

Let’s say you - without additional X - are at a 17% effective rate and a 24% marginal rate. Let’s also say you are $40,000 below the top of the 24% bracket.

You want to convert $25,000.

Are you paying a 17% rate or a 24% rate on that $25,000?

Also, if you have income taxed at the qualified rate, such as qualified dividends or long term gains, your effective rate is going to be different than if all the income was ordinary.

Let’s say instead of a $25.000 conversion, you are looking at $25,000 of additional long term capital gains.

Is your additional tax going to be the 17% effective… or at the 15% long term gains rate for that total income level? (Setting aside the issue of net investment income tax)

Effective rate might be a decent historical discussion at parties or message boards, but it’s garbage for tax planning,
Posted by notsince98
KC, MO
Member since Oct 2012
22084 posts
Posted on 5/20/26 at 8:28 pm to
No when you are running simulations or case studies.
Posted by LSUFanHouston
NOLA
Member since Jul 2009
41081 posts
Posted on 5/20/26 at 8:41 pm to
quote:

No when you are running simulations or case studies.


If you are running total base calcs… but that’s not really tax planning as no decisions are being made.

No one uses - or should use - effective rate when determining impacts of additional income or deductions.
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