Roth IRA vs Roth 401(k) 2026: limits, match, RMDs, and which to fund first
Two Roth accounts, both producing tax-free retirement income, but with very different contribution limits, employer-match dynamics, distribution rules, and expense structures. The Roth IRA is the personal account at $7,000 cap. The Roth 401(k) is the workplace plan at $23,500 cap. The right answer is rarely "one or the other"; it's almost always "both, in the right order".
The side-by-side limit comparison
| Feature | Roth IRA | Roth 401(k) |
|---|---|---|
| Base limit (2026) | $7,000 | $23,500 |
| Age 50+ catch-up | +$1,000 | +$7,500 |
| Ages 60-63 super catch-up | n/a | +$11,250 |
| Income phase-out | $150K-$165K (S) | none |
| Employer match available | no | yes (typically pre-tax) |
| RMDs (post-2024) | no | no |
| Withdraw contributions any age | yes | pro-rata, not contribution-first |
| Typical expense ratio | 3-5 bps | 15-40 bps |
| Fund choice | unlimited | plan menu only |
| Creditor protection | state-dependent | ERISA, federal |
Sources: IRS Notice 2024-80, SECURE 2.0 Act of 2022 §109 (60-63 super catch-up) and §325 (Roth 401(k) RMD elimination), IRC §408A (Roth IRA), IRC §401(k) (401(k)). Creditor protection varies by state for IRAs (BAPCPA federal floor of ~$1.5M).
The employer match question
Employer matching is the single biggest argument for the 401(k) over the IRA. A typical match is 50% on the first 6% of salary, or 100% on the first 3%. For a $100K earner, that's $3,000-$6,000 per year of effectively free retirement contribution. No IRA strategy beats that return.
The match goes to the pre-tax bucket by default. Even if you direct your elective deferral 100% to Roth 401(k), the match lands in the Traditional bucket inside the same 401(k). SECURE 2.0 §604 legalised Roth employer matches starting 2023, but plan adoption has been slow. As of 2026, Vanguard's How America Saves report shows roughly 20% of plans permit Roth match. Most plans still default to pre-tax match.
The pre-tax match means even a 100%-Roth elective deferral builds a meaningful Traditional bucket over time. This is helpful for tax diversification: you end up with a natural mix even if you didn't plan for one. The match dollars also produce a standard-deduction-filling chunk of retirement income that pays $0 federal tax on roughly the first $15-17K of withdrawals per year.
The RMD harmonisation under SECURE 2.0
Before 2024, Roth IRAs had no RMD requirement during the owner's lifetime, but Roth 401(k) balances were subject to RMDs at the applicable age (72, then 73 from 2023). The common workaround was to roll the Roth 401(k) to a Roth IRA before age 73 to eliminate the RMD obligation.
SECURE 2.0 §325, effective 1 January 2024, eliminated RMDs from designated Roth balances in 401(k) and 403(b) plans. Roth 401(k) now matches Roth IRA in this respect: no RMD during the original participant's lifetime.
The mechanical implication: the rollover workaround is no longer needed. There are still other reasons to consolidate (lower expense ratios in an IRA, broader fund choice, simpler estate planning, single account view), but the RMD-driven reason is gone.
Early-withdrawal rules: contributions-first vs pro-rata
A subtle but important difference. Roth IRA distributions follow the IRC §408A(d) ordering rules: contributions come out first, then conversions (oldest first, subject to the 5-year rule), and earnings last. Contributions can be withdrawn at any age for any reason without tax or penalty.
Roth 401(k) distributions before age 59.5 follow a pro-rata rule between basis and earnings. Each withdrawal is treated as partially basis (non-taxable, no penalty) and partially earnings (taxable plus 10% penalty if not a qualified distribution). There is no contributions-first treatment.
For a 45-year-old considering early access, $50,000 withdrawn from a Roth IRA with $40K of contributions and $30K of earnings (total $70K balance) is treated as $40K of contribution principal (no tax, no penalty) and $10K of earnings (taxable plus penalty). The same $50,000 withdrawn from a Roth 401(k) with the same composition is treated as 4/7 basis ($28,571 tax-free) and 3/7 earnings ($21,429 taxable plus 10% penalty). The 401(k) treatment is dramatically worse for early access.
This is one of the structural reasons many retirees roll Roth 401(k) balances to a Roth IRA at retirement or job change. Once in the Roth IRA, the contributions-first ordering applies. For ongoing employees, the rollover usually requires job separation or in-service rollover availability (varies by plan).
The fund-first sequence
Step 1. Capture the full employer 401(k) match. This is the highest-return dollar you will ever put aside.
Step 2. Max the Roth IRA at $7,000 (or backdoor Roth if above the income phase-out). Reasons to favour Roth IRA over Roth 401(k) for these dollars: lower expense ratios (Vanguard, Fidelity, Schwab all offer index funds at 3-5 basis points), unlimited fund choice, contributions-first early-withdrawal ordering, and the long-term simplicity of a single Roth IRA versus multiple Roth 401(k)s accumulated across employers.
Step 3. Return to the 401(k) and continue contributing up to the elective deferral limit ($23,500 in 2026). Mix Roth and pre-tax based on your bracket and tax-diversification target.
Step 4 (high earners). If your 401(k) permits after-tax contributions and in-plan Roth conversion, use the Mega Backdoor Roth to fill the gap up to the $70,000 annual addition limit.
Step 5. Use a taxable brokerage account for anything above the retirement-account limits.
The exception to Step 2: if your 401(k) plan is unusually high-quality (extremely low expense ratios on great index funds, like the TSP for federal employees), you might skip directly to maxing the 401(k) and revisit the IRA later. For most W-2 workers, the IRA wins on fund quality and cost.
Consolidation at job change
When you leave an employer, you generally have four options for your 401(k) balance: leave it in the former employer's plan, roll it to your new employer's plan, roll it to a Traditional IRA (for the pre-tax portion) and a Roth IRA (for the Roth portion), or cash out (almost never the right answer).
Roll to IRA is usually the right answer for the Roth 401(k) portion. The Roth IRA picks up the lower expense ratios, broader fund choice, contributions-first ordering, and simpler estate planning. The 5-year qualification clock transfers (with some quirks around which clock is counted; the IRS rules favour the participant on this).
For the pre-tax 401(k) portion, the calculus is similar but less clear-cut. Leave in the prior plan if it has very low expense ratios (TSP, large-employer plans with under-10-bps index fund options). Roll to Traditional IRA if you want fund flexibility and you do NOT plan to do backdoor Roth conversions in the future (which would be blocked by the pro-rata rule). Roll to new employer's 401(k) if you want to keep the IRA pool empty for future backdoor Roth purposes and the new plan accepts rollovers.
The backdoor-Roth-preserving roll into the new 401(k) is the choice that high earners often regret omitting. Many people roll old 401(k) into a Traditional IRA for fund choice, then years later become high enough earners to want backdoor Roth and discover that the Traditional IRA balance contaminates the conversion via the pro-rata rule. Reversing the decision (rolling IRA back into a 401(k)) is possible but clunky.
FAQ
Which has the higher contribution limit?
Roth 401(k) by a lot. $23,500 base elective deferral vs $7,000 Roth IRA in 2026. Add catch-ups and the gap widens further.
Does Roth 401(k) have income limits?
No. The Roth IRA has phase-outs ($150K-$165K single, $236K-$246K MFJ in 2026). The Roth 401(k) has no income limit, making it the high-earner's primary Roth vehicle.
Are Roth 401(k) RMDs still required?
Not since 1 January 2024. SECURE 2.0 §325 eliminated RMDs from designated Roth balances in 401(k) and 403(b) plans. The rollover-to-Roth-IRA-before-73 workaround is no longer needed for RMD reasons.
Which should I fund first, Roth IRA or Roth 401(k)?
Take the full 401(k) match first (free money). Then prioritise Roth IRA for the next dollars (lower expense ratios, broader fund choice). Then return to the 401(k) for additional contributions up to the elective deferral limit.
Can I take Roth 401(k) contributions out early?
Yes, but the pro-rata rule applies between basis and earnings. Each withdrawal is partially basis (no tax, no penalty) and partially earnings (taxable plus 10% penalty if not qualified). Roth IRA contributions follow contributions-first ordering, which is much more flexible for pre-59.5 access.
Does the employer match for Roth 401(k) also go to Roth?
Default no, it goes to pre-tax. SECURE 2.0 §604 (effective 2023) legalised Roth employer matches, but plan adoption has been slow. As of 2026 most plans still default to pre-tax match. Ask your plan administrator about the option.
Not financial, tax, or legal advice. Figures sourced from IRS Notice 2024-80 (2026 limits), IRC §408A (Roth IRA), IRC §401(k) (401(k) plans), IRC §402(g) (elective deferral limit), SECURE 2.0 Act of 2022 §109 (super catch-up), §325 (Roth 401(k) RMD elimination), §604 (Roth employer match), Vanguard How America Saves report (plan availability statistics), BAPCPA 2005 (federal IRA bankruptcy protection). Tax laws change. Consult a fiduciary financial advisor, CPA, or qualified retirement planner.