Most people hear “Roth” and picture the wrong lever. Here’s how to figure out which one actually applies to you.
If you’ve ever looked into Roth strategies, you’ve probably run into the same pattern. Someone reads an article about Roth conversions, assumes that’s the Roth conversation, and then dismisses the idea because they’re nowhere near retirement. Or they hit the income limit on a Roth IRA, conclude that Roth is off the table, and never think about it again.
Both reactions miss the point. “Roth conversion” isn’t the Roth question. It’s one lever out of three. The real question isn’t whether you should do a Roth conversion. It’s which Roth lever actually applies to your situation, and that answer depends on your employer’s plan, your current income, and where you sit in your career.
Who This Is For
This article is written for a specific kind of reader. If you see yourself in one or more of these situations, the rest of this is worth your time:
- You’re a high-income earner whose income blocks you from making direct Roth IRA contributions
- Your employer’s 401(k) plan may allow after-tax contributions above the standard limit, and you’re not sure whether it does
- You have a large traditional 401(k) balance and you’re approaching retirement or a lower-income year
- You’re within 5 to 10 years of retirement and staring at a sizable pre-tax balance you’d like to manage more tax-efficiently
If any of those hit, the three levers below are worth understanding before you talk to your next advisor, CPA, or HR rep.
The Three Roth Levers
1 Roth 401(k) Contributions
The first lever is the most straightforward, and the most overlooked by high-income earners.
The income wage limits that block Roth IRA contributions do not apply to Roth 401(k) contributions. If your plan offers a Roth 401(k) option, you can direct your salary deferral into Roth regardless of how much you earn. A household earning $400K can contribute the full annual 401(k) limit on a Roth basis. The rules that shut them out of a Roth IRA simply don’t exist inside the workplace plan.
The question isn’t can I contribute. It’s should I. The general rule of thumb: if you expect your tax bracket in retirement to be higher than (or roughly the same as) it is today, Roth 401(k) contributions win. If you’re confident your retirement bracket will be meaningfully lower, traditional pre-tax contributions may win instead. Most high-income earners underestimate how high their retirement bracket will be once required minimum distributions and Social Security stack on top of their portfolio income.
2 The Mega Backdoor Roth
This is the one nobody tells you about.
Some employer 401(k) plans allow after-tax contributions above the standard employee contribution limit. If your plan also allows in-service conversions (or in-plan Roth rollovers), you can route those after-tax dollars into the Roth portion of your plan. The result is that instead of capping out at the standard employee 401(k) limit, you can potentially push tens of thousands of additional dollars per year into tax-free growth.
Two plan features have to line up for this to work:
- After-tax contributions above the standard limit must be permitted in the plan document
- In-plan Roth conversions or in-service rollovers must be available so the after-tax money doesn’t sit in a tax-inefficient bucket
The reason most employees miss this: HR doesn’t proactively explain it. The plan documents are dense, the election is buried, and unless someone points at the specific feature, it just sits there year after year while employees assume they’re already maxed out. We’ve reviewed plans where employees had been leaving tens of thousands of dollars of tax-free growth on the table every year for a decade.
The only way to know if this applies to you is to look at your plan documents, specifically the section on after-tax contributions and in-plan conversions.
3 Roth Conversions
This is the lever everyone thinks of first, and it’s the most situation-dependent of the three.
A Roth conversion means taking dollars that are currently sitting in a traditional IRA or 401(k), paying tax on them at today’s rates, and moving them into a Roth where all future growth and withdrawals come out tax-free. The trade-off is simple on paper. Pay tax now to avoid paying (potentially higher) tax later. But the timing window matters enormously.
The best windows for Roth conversions tend to be:
- Lower-income years: a career transition, reduced hours, or any year where taxable income drops temporarily
- Early retirement, before Social Security and RMDs kick in: often the lowest tax bracket window of someone’s adult life
- Down-market years: converting when account values are depressed means moving more shares at a lower tax cost
The strategy most advisors use is bracket-filling: convert only enough each year to fill up your current marginal tax bracket without pushing into the next one. Done right over a multi-year window, this can meaningfully reduce the tax drag on a large traditional balance.
When conversions are usually a bad idea: peak earning years with no expected income dip, and cases where you’re confident your retirement bracket will be materially lower than your current one.
So Which Lever Is Right For You?
The honest answer is that it depends on a handful of specific things: your career stage, your income, your employer’s plan features, your existing pre-tax balances, and your expected future tax bracket.
Rather than guess, we built a quick decision tree that walks through those questions and gives you a personalized assessment on all three levers. You’ll see which one deserves your primary focus, which are secondary, and which you can deprioritize right now. It takes about 90 seconds.
What the tool assesses: The decision tree considers your career stage, household income, Roth 401(k) availability, after-tax contribution allowance, traditional pre-tax balance, and expected retirement tax bracket. Based on your answers, it evaluates whether Roth 401(k) Contributions, the Mega Backdoor Roth, and Roth Conversions each deserve to be your primary focus, a secondary consideration, or something to deprioritize right now.
A Common Scenario
To make this concrete, consider a hypothetical example.
A software engineer earning $300K has been maxing her standard 401(k) for eight years. She assumes, like most of her colleagues, that she’s shut out of Roth because of the income limits on Roth IRAs. She’s right about the IRA. But when she finally sits down with an advisor and reviews her employer’s plan documents, she discovers that her plan allows after-tax contributions above the standard limit, plus in-plan Roth conversions. That’s roughly an additional $30,000 per year she could have been routing into tax-free growth.
Eight years of missed compounding on that is a six-figure oversight. And she’s not an outlier. Most high-income employees at plans that offer this feature have no idea it exists. The feature isn’t hidden, but it’s buried in plan documents nobody reads, and HR benefits teams aren’t in the business of giving tax strategy advice.
That’s the entire reason we wrote this article. If there’s a chance you’re in the same position, it’s worth 15 minutes to find out.
Are You Leaving Six Figures of Tax-Free Growth on the Table?
If you’ve read this and you’re wondering what Roth options are best for your situation, that’s exactly the kind of question worth talking through. A 15-Minute Discovery Call is a quick conversation to hear your situation, answer what we can, and if it makes sense to go further, the deeper analysis happens as part of our planning process.
No pitch. Just a conversation.
Book Your 15-Minute Discovery CallFrequently Asked Questions
What is the difference between a Roth contribution and a Roth conversion?
A Roth contribution is new money you add to a Roth account from your paycheck or bank account, subject to annual contribution limits. A Roth conversion is moving money you already have in a traditional pre-tax account into a Roth account by paying income tax on the amount converted.
Can high-income earners contribute to a Roth?
Yes, through a Roth 401(k) if your employer offers one, because the income limits that block direct Roth IRA contributions do not apply to Roth 401(k) contributions. High-income earners may also qualify for the Mega Backdoor Roth if their plan allows after-tax contributions above the standard limit plus in-plan Roth conversions.
What is the Mega Backdoor Roth?
The Mega Backdoor Roth uses after-tax 401(k) contributions combined with in-plan Roth conversions to move significantly more money into Roth than the standard 401(k) employee limit allows. It requires two specific plan features: after-tax contributions above the standard limit, and in-plan Roth conversions or in-service rollovers.
When is the best time to do a Roth conversion?
The best windows are typically lower-income years, early retirement before Social Security and RMDs begin, and down-market years when account balances are temporarily depressed. The common thread is a period when your taxable income is lower than normal, so you can pay tax on the converted amount at a lower rate.
Is a Roth 401(k) better than a traditional 401(k)?
It depends on whether you expect your tax bracket to be higher or lower in retirement. If you expect a higher or similar bracket, Roth 401(k) generally wins; if you expect a meaningfully lower bracket, traditional pre-tax contributions may win instead.
How do I know if my employer’s 401(k) plan offers a Mega Backdoor Roth?
Review your plan’s Summary Plan Description or 401(k) portal for two specific features: after-tax contributions above the standard limit, and in-plan Roth conversions or in-service rollovers. Both features must be present for the Mega Backdoor strategy to work.
This article is produced by Ceva Capital LLC dba Ceva Advisors. The information contained herein is intended solely to provide educational content to our clients and other readers that we find relevant and interesting. Opinions expressed are as of the date of publication and are subject to change. Nothing in this document should be construed as investment, tax, or legal advice; we provide advice on an individualized basis only after understanding your circumstances and needs. Information provided comes from sources we believe are reliable, but accuracy is not guaranteed.
