Roth vs. Traditional 401(k): Why High Earners Should Consider Roth 401(k) Contributions

High-income professionals in their forties and fifties often made their 401(k) election years ago without much thought, automatically choosing the pretax option because it seemed obvious – defer taxes now and pay later when you’re in a lower bracket. But… you might not be in a lower bracket later.

The professionals we work with who’ve done an exceptional job saving and building wealth often discover they’ll stay in high tax brackets throughout retirement. When that happens, deferring taxes today just kicks the can down the road while giving up the opportunity to build a pool of tax-free income through Roth 401(k) contributions.

What Makes Roth 401(k) Different for High Earners?

Can high-income earners contribute to a Roth 401(k)?

Yes, and this is where many successful professionals get surprised. Unlike Roth IRAs, which phase out for high earners, Roth 401(k) contributions have no income limits. If your employer offers this option, you have access to a powerful tax diversification tool that many people aren’t even considering.

For 2025, you can contribute up to $23,500 to your 401(k) – whether traditional or Roth – with an additional $7,500 catch-up contribution if you’re 50 or older. That means high earners can potentially put $31,000 annually into tax-free growth through their employer plan.

Why do high earners often stay in high tax brackets during retirement?

When you’ve been disciplined about saving throughout your career, retirement doesn’t necessarily mean a dramatic drop in tax rates. Consider what creates taxable income in retirement:

• Required minimum distributions (RMDs) from traditional 401(k)s and IRAs
• Continued investment income from taxable accounts
• Social Security benefits (up to 85% taxable for higher-income retirees)
• Potential part-time work or consulting income
• Rental property or business income

Many of our clients discover their retirement tax situation looks remarkably similar to their working years, especially when RMDs begin at age 73.

How Should High Earners Evaluate This Decision?

What factors matter most in the Roth versus traditional analysis?

The decision comes down to comparing your current marginal tax rate against your expected retirement rate, but it’s more nuanced than simple bracket comparison. We work with clients to evaluate:

Current tax situation:

• 2025 marginal tax rates range from 10% to 37% for federal taxes
• State income tax implications (no state tax on retirement income in some states)
• Current deduction opportunities and tax planning strategies

Projected retirement scenario:

• Expected withdrawal needs and timing
• Mix of taxable, tax-deferred, and tax-free accounts
• Potential changes in tax policy over 20-30 years
• Estate planning considerations

Should you split contributions between Roth and traditional?

Tax diversification often makes sense for high earners who expect to remain in elevated brackets. Rather than an all-or-nothing approach, many professionals benefit from building both tax-deferred and tax-free buckets.

This strategy provides flexibility to manage taxable income year by year in retirement, potentially keeping you in lower brackets despite having substantial assets. The exact split depends on your specific situation and long-term projections.

Why Most High Earners Haven’t Considered This Strategy

The Roth 401(k) option has only become widely available in recent years, and many employers didn’t historically promote it to higher-income employees. The assumption was often that successful professionals would benefit from current tax deferrals.

But tax planning isn’t one-size-fits-all, and it certainly isn’t a set-it-and-forget-it decision. When you’re building substantial wealth, the long-term tax implications of today’s choices become magnified over time.

The professionals who are most surprised by this analysis are often those who’ve been most successful at following traditional retirement advice – maximize that pretax contribution, get the immediate deduction, worry about taxes later. Sometimes “later” arrives with a bigger tax bill than expected.

What This Means for Your Planning

Making this decision on purpose rather than by default requires looking at the long-term tax impact of your choice. It’s not just about this year’s tax return – it’s about building an efficient wealth accumulation and distribution strategy over decades.

If you’ve never analyzed how your current contribution strategy aligns with your projected retirement tax situation, that analysis could reveal opportunities you’re currently missing. The Roth 401(k) might be a powerful tool sitting right in front of you, available through your employer plan, that you simply haven’t considered.

Frequently Asked Questions

Can I change my 401(k) contribution election if I’m already contributing to traditional?

Yes, most employers allow you to change your election during open enrollment or sometimes throughout the year. Check with your HR department about timing and procedures.

What happens to employer matching contributions with a Roth 401(k)?

Employer matches usually go into the traditional (pretax) side regardless of your contribution choice, providing automatic tax diversification.

Can I do both Roth and traditional contributions in the same year?

Yes, if your 401k plan allows Roth contributions, you can usually split your contributions between both, as long as your total doesn’t exceed the annual limit ($23,500 for 2025, plus catch-up contributions if eligible).

Should I convert existing traditional 401(k) money to Roth?

That’s a separate strategy called Roth conversion, which creates immediate taxable income. Whether it makes sense depends on your current tax situation and long-term projections.

How does this interact with Roth IRA strategies?

High earners who can’t contribute directly to Roth IRAs due to income limits can still access Roth 401(k) contributions, making workplace plans potentially more valuable than previously considered.

The key insight here isn’t that Roth is always better for high earners – it’s that the decision deserves intentional analysis rather than default assumptions. When you’re building wealth on purpose, every element of your strategy should align with where you’re headed, not just where you are today.

Let’s talk about your next step.

Investment advisory services are offered through CapSouth Partners, Inc, dba CapSouth Wealth Management, an independent registered Investment Advisory firm. Information provided by sources deemed to be reliable. CapSouth does not guarantee the accuracy or completeness of the information. This material has been prepared for planning purposes only and is not intended as specific tax or legal advice. CapSouth does not offer tax, accounting or legal advice. Please consult your tax or legal advisor to discuss your specific situation before making any decisions that may have tax or legal consequences.