Roth vs Traditional 401k: Which Should You Choose?

Clients often ask me some version of the same question: when it comes to Roth vs traditional 401k contributions, which side should I choose? It’s a good question, and I’ll give you my honest answer in this post. But before we talk about taxes, I want to start somewhere else, because there’s a bigger decision that matters far more.

The Biggest Decision Isn’t Roth or Traditional. It’s Saving at All.

If you’re not saving for retirement, the pre-tax versus Roth question doesn’t really matter. There’s nothing to decide.

Here’s how I put it to clients: saving is about 90% of the work. Choosing whether to pay your taxes now or later is a secondary question, maybe even a third-tier one. The person who saves steadily into the “wrong” bucket will almost always end up far ahead of the person who never starts because they’re stuck on the perfect choice.

So if you’re not contributing to your 401(k) yet, start there. Even a small percentage of your paycheck is a real beginning. If money feels too tight to save anything right now, my post on getting off the paycheck-to-paycheck treadmill is a good place to begin.

If you’re already saving, well done. You’ve done the hard part. Now let’s make the next decision a simple one.

What Is a Traditional (Pre-Tax) 401(k)?

With the traditional side of your 401(k), your contributions come out of your paycheck before income taxes are taken out. (Social Security and Medicare taxes still apply.) That lowers your taxable income this year, which lowers your tax bill this year.

The money grows tax-deferred over the years. When you take it out in retirement, those withdrawals are taxed as ordinary income.

In short: tax break now, pay taxes later.

What Is a Roth 401(k)?

The Roth side works the other way. Your contributions go in after taxes, so there’s no tax break on this year’s return. Your paycheck will be a little smaller than if you’d put the same amount in pre-tax.

The payoff comes later. Qualified withdrawals in retirement, both what you put in and all the growth, come out tax-free. (Generally, that means you’re at least 59½ and it’s been at least five years since your first Roth contribution to the plan.)

In short: pay taxes now, tax-free later.

Not every plan offers a Roth option, though most larger plans do now. Check your plan’s website or ask HR. The IRS has a helpful page of FAQs on designated Roth accounts if you want the official details.

Roth vs Traditional 401k: A Quick Side-by-Side

• When you pay taxes: Traditional, later in retirement. Roth, now, as you contribute.
• Effect on this year’s taxes: Traditional lowers them. Roth doesn’t.
• Withdrawals in retirement: Traditional withdrawals are taxable income. Qualified Roth withdrawals are tax-free.
• Required minimum distributions (RMDs): Traditional balances are subject to RMDs, generally starting at age 73 (75 if you were born in 1960 or later). Roth 401(k) money is no longer subject to RMDs during your lifetime.
• Contribution limit: One combined limit shared by both sides.

The Contribution Limit Is Shared Between Both Sides

One thing that surprises people: you don’t get a separate limit for each side. The annual limit covers your traditional and Roth contributions combined.

For 2026, the IRS limit for employee contributions to a 401(k) is $24,500. If you’re 50 or older, you can generally add an $8,000 catch-up contribution, for a total of $32,500. If you’re 60, 61, 62 or 63 this year, a higher catch-up of $11,250 may apply if your plan allows it. You can see the official numbers in the IRS announcement of the 2026 401(k) limits.

So if you split your contributions, both halves count toward that single number. Most people aren’t anywhere near the limit, and that’s okay. Again, the goal is to be saving steadily.

One more note for higher earners: starting in 2026, if you earned more than $150,000 in Social Security (FICA) wages from your employer the year before, your catch-up contributions generally have to go in as Roth. If your plan doesn’t offer Roth, you may not be able to make catch-ups at all. Your plan should handle this for you, but it’s good to know.

What About the Employer Match?

If your employer offers a match, make sure you’re contributing at least enough to get all of it. That’s free money (just check your plan’s vesting schedule, since you may need to stay a certain number of years to keep all of it), and it’s usually the best return you’ll find anywhere.

Traditionally, employer matching contributions have always gone in on the pre-tax side, even if your own contributions were Roth. That means most people already have some pre-tax money building up just from the match.

That’s starting to change. The SECURE 2.0 Act now lets employers give employees the option to receive vested matching contributions as Roth. If you choose that, the match counts as taxable income to you in the year it’s made. Not every plan offers this yet, so check with your plan.

My Approach: A Balanced Split Is Almost Never a Bad Idea

In financial planning, as in life, balance is almost never a bad idea. That’s the heart of how I answer the Roth vs traditional 401k question for most clients.

I often suggest starting with a roughly 50/50 split between pre-tax and Roth. Here’s why I like it:

• The pre-tax half lowers your taxable income now. That reduces your yearly income tax bill and leaves a bit more room in your monthly budget.
• The Roth half builds a tax-free bucket for retirement. That gives you money you can draw from later without adding to your taxable income.
• You don’t have to predict the future. Nobody truly knows what tax rates will be in 20 or 30 years, what your income will look like in retirement, or where you’ll be living. Having money in both buckets gives you flexibility to choose which one to draw from each year.

That flexibility really shows up once you retire. Your required minimum distributions are figured on your pre-tax balances and have to come out of that pre-tax money. But beyond what’s required, you get to choose. Need an extra $15,000 for a new roof or a car? Pulling it from the Roth side can keep you from jumping into a higher tax bracket or nudging up your Medicare premiums that year. Having both buckets lets you manage your taxes year by year instead of being stuck with whatever one account dictates.

There’s real peace in that. You don’t have to get the “perfect” answer. You just need a sensible one you can stick with.

When I’d Lean More Toward Pre-Tax

A 50/50 split is a starting point, not a rule. Some situations call for leaning one way.

If you live in a high-tax state like New York or California, you may be especially motivated to lower your tax bill each year. Between federal and state income taxes, every pre-tax dollar can save you more right now. Most states, including New York and California, give you the same break on pre-tax 401(k) contributions. In that case, leaning more heavily toward the pre-tax side may make more sense.

The same can be true if you’re in your highest-earning years and expect your income to drop in retirement.

When I’d Lean More Toward Roth

On the other side, leaning into Roth tends to work best for people who expect to have a lot of money saved by retirement.

Here’s why. Pre-tax 401(k) balances come with required minimum distributions, generally starting at age 73 (75 if you were born in 1960 or later). The IRS requires you to withdraw a certain amount each year, and those withdrawals are taxable whether you need the money or not. If your pre-tax balance is very large, those required withdrawals can push you into a higher tax bracket in retirement.

Roth money avoids that problem. Thanks to SECURE 2.0, designated Roth accounts in a 401(k) are no longer subject to RMDs during your lifetime, starting in 2024. (Your beneficiaries still have distribution rules after you’re gone.) You can read more on the IRS page on required minimum distributions.

So if you expect to have significant retirement assets and want to shield as much of that money from taxable required withdrawals as possible, a heavier Roth tilt can make sense. We can always play around with the math for your situation.

Large balances aren’t the only reason to lean Roth, though. A few other situations can tip the scales:

• You’re in a lower tax bracket now. If you’re early in your career or in a lower-income season, you’ll likely pay less tax today than you will later. Paying it now on Roth contributions can be a good trade.
• You want to leave money to your kids. Most adult children who inherit a 401(k) have to empty it within 10 years, whether it’s Roth or pre-tax. The difference is that qualified Roth withdrawals are generally tax-free, while pre-tax withdrawals are taxed, often right in your children’s peak earning years. (Spouses and a few other heirs get more flexible rules.)
• You’re married and thinking about the surviving spouse. After one spouse passes, the survivor usually ends up filing as single within a year or two (a bit longer with a dependent child at home), with narrower tax brackets on roughly the same income. Roth money gives them more flexibility.
• You want to keep retirement income low on paper. Qualified Roth withdrawals don’t count as taxable income, so they don’t push up Medicare premiums or make more of your Social Security taxable.
• You worry taxes will rise. Nobody knows where tax rates are headed. Roth money is one way to lock in today’s rate on part of your savings.

That said, this situation doesn’t fit most people. And because none of us can truly predict what our situation will look like in retirement, I still like to see clients participating in both buckets now.

A Few Common Worries, Answered

“What if I pick wrong?”

You can’t really pick wrong if you’re saving. That’s the point of the balanced approach. And you can usually change your split anytime through your plan’s website, so this isn’t a forever decision.

“Will Roth make my paycheck smaller?”

A little, compared to putting the same amount in pre-tax, because you’re paying the taxes now. If that’s a stretch, a split gives you some of the tax break today while still building your Roth bucket.

“What happens to my 401(k) if I change jobs?”

Both sides of your account stay yours. You’ll have a few choices for where the money goes next. I walk through them in my post on what to do with an old 401(k).

A Simple Example of the Roth vs Traditional 401k Split

Let’s say you’ve decided to save 10% of your paycheck. With a 50/50 split, you’d set 5% to go in pre-tax and 5% to go in Roth. Your taxable income drops by the pre-tax 5%, so you get part of the tax break today. The other 5% grows in your Roth bucket for tax-free withdrawals later.

If you live in a high-tax state, you might shift that to 7% pre-tax and 3% Roth. If you’re a strong saver expecting a large nest egg, maybe 3% pre-tax and 7% Roth. The total you save stays the same. Only the timing of the taxes changes.

That’s really all the Roth vs traditional 401k choice comes down to: when do you want to pay the tax? Most plans let you set these percentages separately on their website in just a few minutes.

What to Do Next: A Simple Checklist

Here’s how to put all of this into action this week:

• Make sure you’re saving. If you aren’t contributing yet, start, even if it’s a small percentage. This is 90% of the work.
• Get the full employer match. Contribute at least enough to capture every dollar your employer offers.
• Check whether your plan has a Roth option. Log in to your 401(k) website or ask HR. While you’re there, see whether they offer Roth matching.
• Start with a split, like 50/50. Set half your contribution to pre-tax and half to Roth.
• Adjust for your situation. Lean pre-tax if you’re in a high-tax state or your peak earning years. Lean Roth if you expect large retirement balances.
• Raise your savings rate over time. Bump it up by 1% each year or whenever you get a raise.
• Revisit once a year. Look again whenever your income changes, you move to a different state, or your family situation changes.

One quick note: I’m a financial planner, not a tax professional. Everyone’s tax picture is a little different, so it’s wise to check with a tax pro about your specific situation before making big changes.

The Bottom Line

The Roth vs traditional 401k decision matters, but it matters far less than the decision to save in the first place. If you’re saving, you’re doing the most important thing. From there, a balanced split between pre-tax and Roth gives you a tax break today and tax-free money tomorrow, without needing to predict the future.

Good stewardship isn’t about finding the perfect answer. It’s about faithfully doing the sensible thing, year after year, and trusting that steady steps add up.

If you’d like to see where you stand overall, try the free Family Money Check-Up. And if you’d like to talk through your own 401(k) split, you can book a quick 15-minute intro call. No pressure, just a clear conversation.

This post is for educational purposes only and isn’t tax, legal, or individualized investment advice.

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