Roth IRA vs. 401(k): The Complete 2026 Comparison

It's usually not either/or. A 401(k) is an employer plan (any income, $24,500 deferral, plus the match); a Roth IRA is a personal account (income-capped, $7,500/$8,600, tax-free growth). Their limits are separate, so eligible savers can use both. The useful question is how each account fits your budget and needs.

This comparison uses ordinary personal IRAs and a typical 401(k), not separate Roth SEP/SIMPLE arrangements. Regular IRA contributions require eligible compensation (or qualifying spousal compensation on a joint return). Traditional and Roth IRA regular contributions share one annual limit. The workplace deferral limit is shared across pre-tax and Roth deferrals; plan eligibility, compensation and testing rules still apply.

Run your own numbers. The Roth vs. Traditional calculator models the tax-timing side of this decision; this page maps the full workplace-plan-vs-personal-account landscape and how to use both.

Roth IRA or 401(k) — which should you choose?

The framing that dominates search results — "Roth IRA vs. 401(k), pick one" — is mostly a category error. They share your household budget, but not the same contribution limit:

• Different access. A 401(k) requires a sponsoring employer, which can be your own business. You can open a personal Roth IRA yourself, but regular contributions require eligible compensation, or qualifying spousal compensation on a joint return.
• Different, stacking limits. In 2026 you can defer up to $24,500 into a 401(k) and separately contribute up to $7,500 to a Roth IRA ($8,600 if you're 50 or older). The limits are independent — maxing one doesn't touch the other.
• Different gatekeeping. A 401(k) has no income limit to contribute at all. A Roth IRA phases out by modified AGI: Single/Head of Household $153,000–$168,000, Married Filing Jointly $242,000–$252,000, and Married Filing Separately $0–$10,000 if you lived with your spouse at any time during the year. If you lived apart all year and file separately, use the single-filer range. Above the top of your range, direct Roth IRA contributions are off the table — but the 401(k) door stays open.

Because the buckets don't offset, a common approach is to use both and let order do the work: capture the full employer match first (it's compensation you forfeit otherwise), then layer on a Roth IRA and the rest of the 401(k). We map that funding sequence below, along with workplace-plan features (possible loans, the Rule of 55, after-tax-to-Roth routes and ERISA protection for covered plans) and the ones that make a Roth IRA worth opening early (an open investment menu, no lifetime RMDs, its own five-year clock).

One thing this page deliberately doesn't relitigate: the pure Roth-vs-pre-tax tax-timing question — pay tax now or later. That decision compares the tax saved now with the tax that the resulting withdrawals would add later, and it deserves its own treatment. Here, the spotlight is the structural divide between a workplace plan and a personal account, and how to use both.

What are the four account types you're actually choosing between?

"Roth IRA vs. 401(k)" sounds like a choice between two boxes. It isn't. You're really navigating a 2x2 grid, and naming all four cells is the fastest way to stop comparing apples to oranges.

Two questions define the grid. First, when do you pay the tax? A pre-tax contribution reduces taxable income now and is generally taxable when withdrawn. Traditional IRAs may also contain nondeductible contributions, and workplace plans can contain separate non-Roth after-tax money; those amounts require basis tracking. A Roth account takes after-tax money in and pays nothing on qualified withdrawals later. Second, where does the account live? An employer plan is sponsored by your workplace; a personal IRA you open yourself at a broker. Cross those two axes and you get four accounts:

• Traditional 401(k) — pre-tax money, employer plan.
• Roth 401(k) — after-tax money, employer plan.
• Traditional IRA — personal account; contributions may be deductible or nondeductible.
• Roth IRA — after-tax money, personal account.

The vertical axis — the tax-timing call between pre-tax and Roth — is the same decision whether you're inside a 401(k) or an IRA. Because that question depends on the incremental tax at contribution and withdrawal, this page hands it off; we cover it in full in the Roth-vs-traditional comparison. What this page focuses on is the horizontal axis: what changes when the same tax treatment sits inside a workplace plan instead of a personal account. That's where the substantive differences live — contribution ceilings, employer matching, creditor protection, loans, the investment menu, vesting, and rollover mechanics.

One cell trips people up. The Roth 401(k) is a designated Roth account inside the workplace plan — after-tax dollars, tax-free qualified growth, but governed by 401(k) rules, not IRA rules. Critically, it has no income limit to contribute. A Roth IRA cuts off high earners (the 2026 MAGI phase-out runs $153,000–$168,000 single / $242,000–$252,000 married filing jointly), but you can fund a Roth 401(k) at any income. Same "Roth" label, very different gatekeeping. The detailed Roth 401(k) mechanics — five-year clocks, the pre-tax match bucket, and post-2024 RMD changes — get their own dedicated page.

Keep the four cells in mind as you read; the matrix below is the spine of everything that follows. And note the framing throughout: this is general education about how the accounts differ, not a recommendation about which belongs in your plan.

Is there an income limit on a 401(k) like there is on a Roth IRA?

No. This is the single biggest structural difference between the two accounts, and the one most people get wrong. A 401(k) has no income limit to contribute — Traditional or Roth. You can earn $80,000 or $800,000 and still defer up to the $24,500 elective limit (2026), with no phase-out and no high-earner cutoff. A Roth IRA is the opposite: your ability to contribute at all is gated by income.

For 2026, the Roth IRA contribution phase-out runs by modified adjusted gross income (MAGI):

• Single / head of household: $153,000–$168,000 (full contribution below, none above)
• Married filing jointly: $242,000–$252,000
• Married filing separately: $0–$10,000 if you lived with your spouse at any time that year; otherwise the single-filer range applies

The two caps do fundamentally different things, and conflating them is the root of the confusion. The Roth IRA limit controls who is allowed to contribute — cross the top of the range and your direct contribution drops to zero. A 401(k)'s limit is just a ceiling on how much you can put in; there is no MAGI phase-out for deferrals. Plan eligibility, compensation, terms and nondiscrimination testing can still limit contributions.

The myth: high earners can't get Roth money

A common belief is that once you're over the Roth IRA income line, tax-free retirement savings is off the table. It isn't. Being phased out of a direct Roth IRA leaves at least three Roth paths open:

• The Roth 401(k) — the designated Roth bucket inside your workplace plan. Same $24,500 deferral limit, no MAGI gate. This is precisely why the Roth 401(k) is attractive to high earners: it's the only way many of them can put new money directly into a Roth without extra maneuvering.
• The backdoor Roth IRA — a nondeductible Traditional IRA contribution followed by a conversion, which has no conversion-income ceiling but still requires eligible contribution compensation, annual IRA room and attention to the IRA pro-rata rule.
• The mega backdoor Roth — if an eligible plan permits non-Roth after-tax contributions, those amounts may later reach Roth through an in-plan conversion or eligible rollover to a Roth IRA. Employer contributions and ordinary deferrals reduce annual-additions room.

So the Roth IRA income limit is real, but it's a limit on one specific account, not on Roth saving in general. For the exact figures, see the Roth IRA income-eligibility and MAGI phase-out details; for the workaround when you're over the line, see the backdoor Roth IRA explainer.

How does the employer match work — and is it tax-free?

The match is the single best argument for funding a 401(k) before anything else. It is, quite literally, free money: an employer contribution you earn just by deferring some of your own pay. A common formula is a full match on the first 3% of salary plus half on the next 2% — but formulas vary, and many savers contribute at least enough to capture the entire match before sending a dollar anywhere else. Leaving match on the table is leaving compensation on the table.

Here is the part most comparison pages skip. A traditional employer match is pre-tax, and it stays pre-tax even when your own deferrals go into the Roth side of the plan. It lands in a separate pre-tax bucket, grows tax-deferred, and is taxed as ordinary income when you withdraw it — along with all of its growth. So a "Roth 401(k)" account often has two tax characters living under one plan: your Roth deferrals (tax-free in retirement) and the employer match (taxable later).

The practical check is how the match itself is labeled. A pre-tax match and its growth are generally taxable when withdrawn. An elected Roth match follows the Roth rules below; the word "Roth" on your own paycheck contribution does not settle the match’s treatment.

The new optional Roth match (SECURE 2.0 §604)

There is now an exception. SECURE 2.0 §604 lets a plan offer employees the choice to take the employer match (and nonelective contributions) as Roth instead of pre-tax. The catches:

• The plan must offer it, and you must elect it. Choosing Roth for your salary deferrals alone does not make the employer match Roth.
• You must already be fully vested in that contribution type when it is allocated. Choosing Roth does not bypass a vesting schedule or make a partly vested match eligible.
• It is income in the year allocated to your account. That may differ from the year the employer deducts the contribution. Later withdrawals of the Roth match and its growth are tax-free when the qualified-distribution rules are met.
• It's reported on Form 1099-R (code G), not your W-2. Expect a separate tax form for the Roth-elected match.

A Roth IRA, by contrast, has no employer match at all — there is no employer in the picture. The match is a workplace-plan feature, full stop, and it's one of the clearest reasons the 401(k) earns the first dollars.

How much can you put in each for 2026 (and the three catch-up rules)?

The two accounts sit on entirely separate limits, and that is the first thing to get straight: contributing to one does not eat into the other. For 2026 you can put up to $24,500 into a 401(k), 403(b), or governmental 457(b) as your own elective deferral, and up to $7,500 into a Roth IRA ($8,600 if you're 50 or older, which folds in a $1,100 catch-up). Max both and a saver under 50 is sheltering $32,000 across the two — the limits are additive, not shared.

That $24,500 is only your slice. The §415(c) cap on total annual additions to a 401(k) — your deferrals plus the employer match plus any after-tax contributions — is $72,000 for 2026 (up from $70,000 in 2025), with catch-up contributions stacking on top of that. Employer contributions and other counted additions reduce the remaining after-tax room; compensation and plan limits may reduce it further. That room can support the mega-backdoor route (covered later); the Roth IRA has no equivalent employer or after-tax layer.

The three catch-up regimes

• Standard age-50 catch-up. Turn 50 by year-end and your 401(k) deferral limit rises by $8,000, to $32,500 total.
• Ages 60–63 "super catch-up." Under SECURE 2.0 §109, in the year you're 60 through 63 the catch-up jumps to $11,250 instead of $8,000, lifting your 401(k) deferral limit to $35,750. It reverts to the standard catch-up at 64.
• The §603 Roth catch-up rule (new pressure for 2026). If your prior-year FICA wages from that same employer exceeded the indexed threshold, your catch-up can no longer go in pre-tax — it must be made as a Roth (after-tax) contribution. The statute set the floor at $145,000; the figure indexes in $5,000 steps, and the threshold that governs the 2026 determination — based on your 2025 W-2 wages — is $150,000. The earlier IRS administrative transition relief lapsed after 12/31/2025, so plans are generally expected to begin applying the rule for 2026 under a reasonable, good-faith reading of the statute; the final regulations themselves apply to contributions in taxable years beginning after December 31, 2026 (with a later date for certain governmental and collectively bargained plans). The rule reaches only elective-deferral catch-ups — not SEP or SIMPLE employer contributions, and not self-employment income itself. An owner paid FICA wages by their corporation can be subject to the wage test. Related-employer, common-paymaster and successor situations need the applicable rules, not a blanket no-aggregation assumption.

The §603 rule doesn't cost you a dollar of contribution room — it changes the tax bucket the catch-up lands in. For a high earner who assumed their catch-up was shaving today's taxable income, that's a real planning shift worth confirming with the plan administrator. See the catch-up timeline visual for how the three regimes overlap by age, and the deep dive on 2026 Roth IRA contribution limits for the IRA side in detail.

Roth or pre-tax — how do you actually decide on the tax?

Compare the tax saved on a contribution now with the tax that the resulting retirement withdrawals would add later. A household's average rate is not automatically the rate for its next withdrawal: pension income, Social Security and other withdrawals may already use the deduction and lower brackets.

Here is a limited illustration, not a complete account comparison. Assume a single filer under 65 has $40,000 of fully taxable retirement-account income in 2026, no other income, the basic standard deduction and no other adjustments or credits.

The tax-return tax table can differ slightly from this bracket-schedule illustration. A separate hypothetical $10,000 contribution wholly deductible at 24% saves $2,400 today. These figures show why lower-bracket room can matter; they do not prove that the resulting retirement dollars will face a 6.55% rate. A fair comparison also uses the same starting spendable budget, investment assumptions and treatment of tax savings.

State taxes and a future move can change the result. Neither account always wins. See Roth versus Traditional IRA and the comparison calculator. The 2026 schedules in Revenue Procedure 2025-32 support the figures above.

Do Roth IRAs and 401(k)s have required minimum distributions?

Required minimum distributions (RMDs) are the amounts the IRS forces you to withdraw — and pay tax on — once you reach a certain age. Whether they apply turns on two things: the account type and whether the money is pre-tax or Roth. Across the four cells here, the answer splits cleanly.

Roth IRA — none for the owner, ever. A Roth IRA has no lifetime RMDs for the original owner (§408A(c)(4)). You can leave the balance untouched and growing for your entire life. (Beneficiaries who inherit a Roth IRA do face their own distribution rules — a separate topic.)

Roth 401(k) — none, beginning 2024. This is the part most stale articles get wrong. SECURE 2.0 §325 eliminated lifetime RMDs from designated Roth accounts inside an employer plan starting in 2024. 2023 was the last year they applied. Before that, a Roth 401(k) — unlike a Roth IRA — did force annual withdrawals once you hit RMD age, which is why people rolled the balance into a Roth IRA to escape them.

Traditional 401(k) and Traditional IRA — yes, at 73 or 75. The final rules specify age 73 for people born in 1951–1958 and 75 for those born in 1960 or later. The accompanying proposed rule specifies 73 for 1959; that provision is not finalized in T.D. 10001. Earlier cohorts had earlier starting ages. An employer plan may allow a still-working delay for someone who is not a more-than-5% owner; IRAs do not. Taxable RMD portions are ordinary income, and missing a required amount can trigger an additional tax. See the final and proposed rules and Publication 575.

The "roll your Roth 401(k) out to dodge RMDs" reason is dead

For years the standard advice was to roll a Roth 401(k) into a Roth IRA purely to avoid the Roth 401(k)'s RMDs. Since 2024, that reason no longer exists — both accounts are now RMD-free for the owner. And to clear up a persistent myth: there was never a $5 million threshold above which Roth 401(k) RMDs kicked in. That figure was made up; the §325 repeal is total.

Other reasons to roll a Roth 401(k) into a Roth IRA may still make sense — a wider investment menu, consolidation, or lower fees — but be aware a rollover can affect your 5-year clock. RMD avoidance is no longer one of them.

Which gives you better access to your money before retirement?

This is where the two accounts diverge most sharply. Each has an early-access feature the other simply doesn't have, so "more flexible" depends entirely on which lever you need.

The 401(k) can lend; an IRA can't

A 401(k) may offer a loan, but it does not have to. Plan terms, vested benefits and existing or recent loans affect the available amount. Repayment is generally required within five years, with an exception for a loan used to buy a principal residence. See the IRS plan-loan FAQs for limits and conditions.

An IRA cannot lend to its owner. Taking cash out is a distribution. An eligible distribution may qualify for a rollover, but that is a different transaction, with reporting and eligibility rules — not a borrowing feature.

• The usual redeposit deadline is 60 days after receipt. To roll over the entire eligible distribution, replace the full amount, including any withholding. Some distributions are not eligible; specific exceptions or relief can change the deadline.
• The once-per-12-month limit covers IRA-to-IRA 60-day rollovers, counting your IRAs together. It does not cover same-type trustee-to-trustee IRA transfers, Traditional-to-Roth conversions, or eligible rollovers to or from workplace plans. Those transactions still have their own rules.
• A missed deadline does not make every Roth dollar taxable. Without applicable relief, the payment remains a distribution; tax depends on the account, remaining basis, ordering rules and qualification. A qualified Roth distribution or a withdrawal of remaining regular contributions can still be tax-free. An ineligible redeposit can create an excess contribution.

Successful indirect rollovers are still reported; they are not treated as though no transaction occurred. Deadline relief does not waive the one-rollover-per-year restriction. See the IRS rollover explanation, our 60-day rollover guide and why a Roth IRA is not a loan account.

The Rule of 55 — and the trap of rolling out

If you leave your employer in or after the calendar year you turn 55, distributions from that employer’s qualified plan can qualify for an exception to the 10% early-distribution tax. The plan must permit the withdrawal; ordinary income tax can still apply. Qualifying public-safety employees and private-sector firefighters have special age/service rules described in Publication 575.

The age-55 exception does not apply to IRA distributions. After a rollover to an IRA, money withdrawn from that IRA follows IRA rules. That is different from saying all penalty-free access is permanently lost: remaining regular Roth contributions and other statutory exceptions may still be available. Substantially equal periodic payments (SEPPs) are one possible exception, not the only one. A later eligible transfer to an accepting employer plan must be evaluated under that plan’s rules; do not assume a former employer’s exception follows the money.

Roth IRA contributions come out anytime

For an ordinary personal Roth IRA, nonqualified withdrawals use ordering rules: regular contributions first, then conversions and rollover amounts, then earnings. Conversion amounts are generally taken in tax-year order. Remaining regular-contribution basis comes out free of federal income tax and the early-distribution tax at any age. It is not simply your lifetime contribution total: earlier withdrawals and other adjustments can reduce what remains. Converted amounts and earnings have additional rules. See the withdrawal guide and Publication 590-B.

Which is better protected from creditors and lawsuits?

This is a real advantage of the 401(k) that almost no consumer comparison mentions, and it cuts the opposite way from most of this page: the workplace plan generally wins on asset protection.

An ERISA-covered 401(k) carries unlimited federal ERISA anti-alienation protection. Under ERISA's anti-alienation rule, the assets in a qualified employer plan generally cannot be reached by creditors at all — and that protection holds both inside and outside of bankruptcy, with no dollar ceiling. A creditor who wins a lawsuit against you usually cannot touch a 401(k) balance (the main carve-outs are the IRS, a QDRO in divorce, and certain criminal-restitution claims).

One condition matters for the self-employed: this protection requires an ERISA-covered plan, and a solo 401(k) covering only the owner — or the owner and a spouse — generally is not one. Labor Department regulations provide that an individual and their spouse are not treated as employees of a business they wholly own, so a plan with no employee participants falls outside ERISA. Outside bankruptcy, such a plan depends on state law rather than anti-alienation. Inside bankruptcy the outcome is generally unchanged, because the Bankruptcy Code shields retirement funds held in any plan qualified under IRC §401(a) whether or not ERISA applies.

For a bankruptcy case filed from April 1, 2025 through March 31, 2028, the general federal exemption cap for covered Traditional and Roth IRA assets is $1,711,975 in aggregate, not per account. But it is not a universal ceiling: the statute excludes specified employer-plan rollover contributions and their earnings from that cap, and a court may increase the capped amount if the interests of justice require it.

The source of the money matters. The exclusion in 11 U.S.C. §522(n) names specific employer-plan rollover provisions and the earnings attributable to those rollovers. It does not list ordinary IRA-to-IRA rollovers or Roth conversions as independent ways to escape the cap. Records tracing the money matter; do not assume that every transaction called a "rollover" or "conversion" has the same protection.

Outside of bankruptcy — an ordinary lawsuit, a creditor judgment, a malpractice claim — IRA creditor protection is governed by state law and varies widely. Some states fully shield IRAs; others protect only what's "reasonably necessary" for support; a few offer little. The 401(k)'s ERISA shield does not depend on which state you live in.

For most savers this asymmetry never matters. But it is a legitimate reason some people leave money in a 401(k) rather than rolling it out — relevant for physicians, business owners, landlords, and anyone with meaningful lawsuit exposure. Asset-protection planning is fact-specific and state-specific; this is general education, not legal advice.

How do investment choices and fees compare?

A 401(k) commonly offers a plan-selected menu; some plans also offer a brokerage window. An IRA's choices depend on its custodian and IRA investment restrictions. Broader choice does not automatically mean lower cost or a better investment.

Compare account charges and investment expense ratios. A plan may add administration fees, but it may offer institutional pricing or investments unavailable through your IRA provider. IRAs can carry custody, transaction or advisory fees too. The Labor Department's 401(k) fee guide explains what to check.

• Vesting: your own plan contributions and their earnings are fully vested. Employer contributions may vest on a schedule. Check it before treating a future match as money you can keep after leaving.
• Employer stock: a qualifying distribution may preserve net unrealized appreciation (NUA) treatment. Generally, the plan's cost basis is taxable when distributed, while eligible appreciation receives long-term capital-gain treatment when the stock is sold. Lump-sum and other conditions matter; rolling the shares into an IRA generally loses that treatment. Publication 575 explains the requirements.

Compare the actual plan and IRA rather than assuming one account always wins.

What order should you fund a 401(k) and a Roth IRA?

For most savers with access to both, the question isn't 401(k) or Roth IRA — it's the order you feed them. A common approach is a "waterfall": fill each tier only after the one above it is full. The waterfall visual below lays out the same sequence.

• 1. Capture the full employer match. If your plan matches, say, 50% of the first 6% you defer, contributing less than 6% may leave employer compensation unclaimed. Check the formula, vesting and any true-up rules; a match is not a promise about investment returns.
• 2. Fund a Roth IRA and/or an HSA. Up to $7,500 ($8,600 if 50 or older) into a Roth IRA, subject to the MAGI limits. An HSA, if you meet HSA eligibility requirements, offers its own triple-tax-advantaged space many savers fill in parallel.
• 3. Go back and max the 401(k) to the $24,500 elective-deferral cap ($32,500 with the age-50 catch-up, $35,750 in the 60–63 window).
• 4. Mega backdoor Roth, if the plan allows it — eligible non-Roth after-tax money can move to Roth through an in-plan conversion or permitted rollover. Employer additions and ordinary deferrals use some of the $72,000 cap; it is not an extra Roth allowance.

Before any of this: most frameworks put a starter emergency fund and any high-interest debt (credit cards) ahead of retirement contributions beyond the match — avoiding interest at your actual card rate can be valuable without taking investment risk. That is step zero, not part of the retirement waterfall itself.

None of this is a personalized recommendation. It's a general framework; the right tier ordering depends on your tax bracket, plan features, and goals.

Why hold both buckets at all

The deeper rationale for splitting contributions across pre-tax and Roth is tax diversification — and it's a concrete planning lever, not a slogan. In retirement, having both a pre-tax 401(k) and a Roth IRA lets you choose which account to draw from each year. That withdrawal-sequencing flexibility can help you stay under an IRMAA Medicare-premium tier, keep below the NIIT thresholds ($200,000 single / $250,000 MFJ), limit how much of your Social Security gets taxed, and avoid pushing long-term capital gains into a higher stacking bracket. That flexibility depends on the accounts and withdrawal rules; it does not guarantee a lower total tax bill.

The high-fee exception. The waterfall assumes a reasonable 401(k) menu. If your plan's funds carry steep expense ratios or layered recordkeeping fees, that can strengthen the case for the Roth IRA step before additional unmatched plan contributions. Over decades, fee drag compounds against you as relentlessly as returns compound for you.

Another benefit to check is the Saver's Match, starting with tax-year 2027 contributions. It is a federal benefit, separate from an employer match: an income-based rate of up to 50% applies to as much as $2,000 of net qualifying contributions after counted distributions, for a maximum of $1,000 per eligible person. A Roth contribution can qualify, but direct Treasury payment needs an accepting traditional IRA or non-Roth plan portion. The early-2027 IRA calendar explains how the designated contribution year changes the benefit and claim year.

For the self-employed, see the Solo 401(k)-versus-Roth-IRA comparison.

Can a 401(k) get you more Roth money than the limits suggest?

Sometimes. A mega-backdoor Roth starts with non-Roth after-tax contributions to an eligible workplace plan. These differ from Roth 401(k) salary deferrals. They may reach Roth through an in-plan conversion or an eligible rollover to a Roth IRA. An eligible 403(b) can support these features too; this is not a 401(k)-exclusive legal category.

The 2026 annual-additions ceiling is generally the lesser of $72,000 or 100% of compensation. Ordinary employee deferrals, employer contributions and non-Roth after-tax contributions share that room. Qualifying catch-up contributions sit outside this ceiling; plan limits and testing can reduce what is available.

The plan must allow non-Roth after-tax contributions. To move them to Roth while employed, it must also offer an available in-plan conversion or eligible in-service distribution route. Without that route, an eligible distribution after a later separation may still permit a rollover. Meanwhile, earnings on non-Roth after-tax money are generally tax-deferred, not taxed annually like a regular brokerage account.

Destination matters. Under Notice 2014-54's allocation framework, a distribution's after-tax portion can go to a Roth IRA while its pre-tax portion goes to a Traditional IRA or another eligible plan. You cannot simply declare that a mixed distribution contains only basis. Pre-tax money moved to Roth is generally taxable. The ordinary Roth IRA income limit and annual contribution cap do not cap an eligible rollover.

Different from an ordinary backdoor Roth

An ordinary backdoor Roth begins with an eligible Traditional IRA contribution, often nondeductible, followed by a Roth conversion. The contribution still uses annual IRA room and requires eligible compensation; conversion tax depends on the same owner's aggregate Traditional, SEP and SIMPLE IRA basis and balances. The mega-backdoor route begins in a workplace plan and can end in its Roth account or a Roth IRA.

See the mega-backdoor guide, ordinary backdoor guide and rollover route comparison before treating either label as a tax-free shortcut.

Who should lean toward the 401(k), and who toward the Roth IRA?

There is no universal winner here. The accounts solve different problems, and the right emphasis depends on your situation. Think in terms of signals that tilt the decision rather than a verdict. The head-to-head scorecard above lays out the line items; this is how to read them for your own case.

Signals that lean toward the 401(k)

• You have an employer match on the table. Capturing the full match is the closest thing to free money in the tax code, and no Roth IRA can replicate it. For many savers this comes first, full stop.
• Your income is above the Roth IRA gate. Direct Roth IRA contributions phase out at $153,000–$168,000 (single/HoH) and $242,000–$252,000 (MFJ) in 2026. A 401(k) has no income limit to contribute, Traditional or Roth, so high earners often route more here.
• Creditor protection matters to your decision. An ERISA-covered 401(k) generally protects benefits from ordinary creditors without a dollar cap. Exceptions include qualified domestic-relations orders. An owner-only solo 401(k) generally is not covered by ERISA Title I, although qualifying retirement funds can still receive federal bankruptcy protection. An IRA’s outside-bankruptcy protection depends on applicable state law, not the federal bankruptcy cap.
• You are comparing early-access rules. A qualifying separation in or after the calendar year you turn 55 can permit plan withdrawals without the additional 10% tax. IRAs do not have that exception, but remaining Roth contribution basis and other IRA exceptions are separate access routes.
• Your plan offers a mega backdoor Roth. If it allows non-Roth after-tax contributions and an available Roth conversion or rollover route, it can support additional Roth saving. Employer contributions and ordinary deferrals reduce annual-additions room; not every dollar under the cap is automatically Roth.

Signals that lean toward the Roth IRA

• Your plan menu is expensive or thin — high expense ratios, recordkeeping fees, few fund choices. Over decades, fee drag compounds against you.
• You want the open investment universe. An IRA may offer more choices through its custodian. Some 401(k) plans also offer brokerage access; compare actual menus and restrictions.
• You value contribution-withdrawal flexibility. Roth IRA contributions (not earnings) can be withdrawn anytime, tax- and penalty-free.
• You expect a higher tax rate later. If your future rate looks higher than today's, paying tax now in a Roth often appeals.

For most savers, though, the honest answer is both, in sequence — not one or the other. A common approach: capture the full match first, then fund a Roth IRA (and/or an HSA) for the open menu and flexibility, then return to max the 401(k), then the mega backdoor if the plan supports it. See the funding-order section for that walkthrough. As always, this is general education, not personalized advice — what fits depends on your situation.