Dave Ramsey on Roth vs. traditional 401(k)

Personal finance guru Dave Ramsey recently weighed in on the topic of 401(k) retirement plans and a lesser-known enhancement to the concept called the “Roth 401(k).” And I have to say:

I’ve rarely seen a concept explained more clearly in 45 seconds than Ramsey did in this video.

Here is the text of what Ramsey said, in full:

“The Roth mathematically kicks the traditional [IRA’s] bottom. And here’s why: If you take $200 a month from age 25 to age 65, 40 years, and invest it in a decent growth stock mutual fund, you’ll have $2.5 million in there.

However, only $96,000 of the $2.5 million is the actual principal you put down. So if you have made a [401(k)]you would have got a tax break for $96,000. You still wouldn’t have paid taxes on the $96,000. But you’ll pay taxes on the entire $2.5 million as you take it out.

If you did that with a Roth instead [401(k)]you would pay taxes on the $96,000 [before you put them in the plan as your contribution] and zero taxes on the rest of the two and a half million.”

As I listen to the explanation, it seems clear to me. But let’s take this step by step and see if we can make it a little more systematic.

This post was updated on January 26, 2025 to include a section on when a regular 401(k) might actually be preferable to a Roth.

Created under the Revenue Act of 1978 as section 401(k) of the Internal Revenue Code, 401(k) plans began to become popular in the early 1980s and really gained momentum as defined benefit pension plans fell out of favor in the 1990s. Then, in 2001, the Economic Growth and Tax Reconciliation Act created a new savings vessel called the Roth 401(k), and it became available to employers on January 1, 2006.

So 401(k) plans have been around for almost 50 years and Roth 401(k)s have been around for almost 20 years, even though many workers don’t know much about the latter. What is the big difference between the two?

It works like this. (I should say it works “very roughly” like that. Consult your tax advisor for details). Let’s say you earn $50,000 and, between your own and employer contributions, you decide to put 10% of your salary, or $5,000, into a 401(k) plan. That $5,000 contribution is made pre-tax, meaning subtracted from your taxable income, so before you change it, your taxable income just dropped to $45,000. By the way, you just dropped out of the 22% tax bracket and the 12% tax bracket!

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