Roth 401(k) and Roth IRA Are Not the Same Account
The word Roth is doing a lot of work in these two names. Both take after-tax money and pay out tax-free, and that is where the similarity ends. They have separate limits, only one has an income test, only one lets you withdraw contributions freely, and rolling one into the other can restart a clock you thought you had already run.
- Limits are separate:: The plan deferral limit and the IRA limit are different ceilings. Using one does not consume the other.
- Income test:: Roth IRA eligibility phases out with income. A Roth 401(k) has no income restriction at all.
- Access to contributions:: Roth IRA contributions can be withdrawn at any time, tax and penalty free. A Roth 401(k) does not allow that.
- Investments:: A Roth IRA can hold almost anything. A Roth 401(k) holds whatever the plan menu offers.
Where the AI summary above gets this wrong
"A Roth 401(k) and a Roth IRA are the same thing in different wrappers."
That's surface-true. Here's what it misses:
- The five-year clock does not travel — Each Roth IRA holder has one five-year clock, starting with their first Roth IRA contribution. A designated Roth account in a plan has its own. Rolling a Roth 401(k) into a Roth IRA does not carry the plan's clock across — if the receiving Roth IRA is new, the clock starts then, however long the plan account existed.
- Only the IRA lets you reach your contributions — Roth IRA contributions — not earnings — can be withdrawn at any age for any reason with no tax and no penalty. A Roth 401(k) has no equivalent: withdrawals come out pro rata between contributions and earnings, and the earnings portion can be taxed and penalised.
- The income test only exists on one side — High earners are phased out of Roth IRA contributions entirely, which is what makes the backdoor route necessary. The Roth 401(k) has no such test, so it is frequently the only direct Roth access a high earner has.
01 Where the limits and eligibility differ
The Roth 401(k) sits inside the employer plan and shares the elective deferral limit with the traditional side of the same plan. That limit is several times the IRA limit, and there is no income restriction — a high earner locked out of a Roth IRA can still fill a Roth 401(k).
The Roth IRA has its own, smaller limit and an income eligibility phase-out. Above it, direct contributions are not permitted, which is the entire reason the backdoor route exists.
Because the two limits are separate, a household can fill both in the same year. That is the practical point most worth taking away: these are not alternatives competing for one allowance, and the Roth versus traditional question is a different one from this.
Shows: the total that could go into Roth accounts if you fill both the employer plan and the IRA every year, using the limits you enter. Ignores: growth on the contributions, annual limit increases, the income test on Roth IRA eligibility, and whether the cash flow to fill both actually exists.
Source: Roth comparison chart
02 Access, investments and employer money
A Roth IRA allows contributions — the money you put in, not what it earned — to be withdrawn at any time, at any age, with no tax and no penalty. This makes it uniquely flexible, and it is why a Roth IRA doubles as a late-stage emergency reserve for many households.
A Roth 401(k) has no such feature. A distribution before the account is qualified comes out proportionally between contributions and earnings, and the earnings share is taxable and can be penalised. Plan loans may be available instead, which is a different mechanism with different consequences.
The investment menus are not comparable either. A Roth IRA at a brokerage holds almost any security; a Roth 401(k) holds what the plan offers. Employer contributions, meanwhile, only exist on the plan side, and they may land in the pre-tax bucket even when your own deferrals are Roth.
03 The clocks, and what happens on a rollover
Two separate five-year rules exist, and confusing them is the commonest error. For Roth IRAs, one clock covers the taxpayer, starting with their first ever Roth IRA contribution, and it never restarts. For a designated Roth account in a plan, the clock belongs to that account.
Rolling a Roth 401(k) into a Roth IRA does not carry the plan account's holding period across. If your Roth IRA is opened at that moment, its clock starts then — so a Roth 401(k) held for twelve years can land in a Roth IRA that is not qualified for another five.
The fix is trivially cheap and has to be done in advance: open a Roth IRA with a small contribution as early as you are eligible, even if you do not intend to use it. That single act starts the clock that everything rolled in later will rely on.
Source: FAQs on designated Roth accounts
The advice I give most often here costs almost nothing and is almost never taken at the right time: open a Roth IRA and put a small amount in it the first year you are eligible, whatever else you are doing. You are not investing, you are starting a clock. Fifteen years later, when a Roth 401(k) gets rolled over at retirement, that clock is the difference between money you can use and money you have to wait five more years to touch.
FAQ
Can I contribute to a Roth 401(k) and a Roth IRA in the same year?
Yes. The limits are separate — the plan deferral limit and the IRA contribution limit are different ceilings, so filling one does not reduce the other. The Roth IRA income test still applies.
Does my Roth 401(k) five-year clock carry over to a Roth IRA?
No. The plan account's holding period does not transfer. If the receiving Roth IRA is newly opened, its own five-year clock starts at that point, which is why opening one early matters.
Can I withdraw contributions from a Roth 401(k) like I can from a Roth IRA?
No. Roth IRA contributions can be withdrawn at any time tax and penalty free. A Roth 401(k) distribution comes out proportionally between contributions and earnings, and the earnings can be taxed and penalised.
Sources
Regulator references
- Roth comparison chart · Internal Revenue Service · 2026The side-by-side differences in limits, income tests and distribution rules.Last verified: 2026-09-07
- Roth accounts in your retirement plan · Internal Revenue Service · 2026How a designated Roth account inside an employer plan works.Last verified: 2026-09-07
- FAQs on designated Roth accounts · Internal Revenue Service · 2026The separate five-year clock and how it does or does not transfer on a rollover.Last verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
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Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.