What Is a Designated Roth Account? Roth 401(k) IRC §402A Explained 2026

A designated Roth account is the IRS's formal name for the Roth portion of an employer-sponsored retirement plan — the Roth 401(k), Roth 403(b), or governmental Roth 457(b). Defined by IRC §402A (added by the Pension Protection Act of 2006), the term covers all employer-plan Roth features in a single statutory bucket. It's distinct from a Roth IRA, which is governed by a separate IRC section (§408A) with different contribution limits and rules. Most readers and HR departments call this a "Roth 401(k)" — "designated Roth account" is the formal IRC term used in tax law and IRS guidance.

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Quick Facts

infoIRC §402A is the governing section. Distinct from §408A (Roth IRAs).
infoCovers Roth 401(k), Roth 403(b), and governmental Roth 457(b). Same Roth tax treatment across all three plan types.
check_circle2026 elective deferral limit: $24,500 ($32,500 with age-50 catch-up). Ages 60-63 super catch-up: $11,250 (total $35,750) per SECURE 2.0 §109.
infoNo income limit on contributions. Unlike Roth IRAs, designated Roth accounts have no MAGI phase-out — anyone with employer-plan access can contribute regardless of income.
check_circleNo lifetime RMDs as of 2024 per SECURE 2.0 §325 — eliminating a long-standing disadvantage relative to Roth IRAs.

Roth IRA vs. Designated Roth Account: The Differences

Both have the same Roth tax treatment (after-tax in, tax-free qualified withdrawals out), but the rules diverge:

Contribution limits. Roth IRA: $7,500 / $8,600 50+ (2026). Designated Roth (Roth 401(k)): $24,500 / $32,500 50+ / $35,750 ages 60-63.
Income limits. Roth IRA: phase-out at $153K-$168K single / $242K-$252K MFJ. Designated Roth: NO income limit.
Investment options. Roth IRA: virtually any investment (limited only by IRC §408(m) collectibles ban). Designated Roth: limited to the plan's investment menu (typically 10-30 funds).
Withdrawal flexibility. Roth IRA: contributions out anytime, tax-free, penalty-free, no employer involvement. Designated Roth: in-service withdrawals subject to plan rules and §72(t) penalty if under 59½ (no separate "contributions out anytime" rule like the IRA's IRC §408A(d)(4) ordering).
Employer match. Roth IRA: none. Designated Roth: usually matched (match dollars go into the pre-tax 401(k) bucket; SECURE 2.0 §604 allows election to receive match as Roth).
Required minimum distributions. Roth IRA: never (per IRC §408A(c)(5)). Designated Roth: none for owners as of 2024 (SECURE 2.0 §325). Inherited Roth (both types): SECURE Act 10-year rule applies.

How to Tell If Your Plan Has a Designated Roth Option

Not all employer plans offer a Roth feature. Check the plan's Summary Plan Description, the contribution-election page in your benefits portal, or ask HR. The Roth option, if present, will appear as a separate election alongside the traditional pre-tax option. You can typically split your elective deferral between traditional and Roth (e.g., 5% to traditional, 5% to Roth).

SECURE 2.0 §603 (effective 2026 for most plans, finalized via TD 10007 September 2025) requires high earners — those with prior-year FICA wages above $145,000 (indexed) — to have any catch-up contributions go into a designated Roth account, not the traditional pre-tax bucket. This effectively forces high earners into the Roth feature for their catch-up dollars. Plans must offer the Roth option to comply.

Strategic Use Alongside a Roth IRA

Most savers can use both: the designated Roth account at work for high-volume contributions ($24,500 elective deferral cap), and a separate Roth IRA for the additional $7,500 contribution and the IRA's withdrawal flexibility advantage.

The standard sequence: capture the full employer 401(k) match first (free money, often into traditional 401(k)); then fund a Roth IRA up to $7,500/$8,600; then return to additional 401(k) contributions, potentially into the designated Roth account if you want more after-tax bucket. This captures the match, secures the IRA's flexibility, and maximizes total tax-advantaged space.

For high earners above the Roth IRA income limit, the designated Roth account is your only direct Roth path (no income limit). Backdoor Roth IRA remains available as a workaround.

Frequently Asked Questions

Is a designated Roth account the same as a Roth 401(k)?

Yes — designated Roth account is the IRS's formal name; Roth 401(k) is the common term most people use for the same thing in a 401(k) plan. The IRC §402A term covers Roth 401(k), Roth 403(b), and governmental Roth 457(b) under one umbrella.

Can I roll a designated Roth account to a Roth IRA?

Yes. When you separate from service or reach age 59½ (depending on plan rules), you can roll the designated Roth account balance to a Roth IRA. The rollover is tax-free since both accounts have Roth tax treatment. After the rollover, the dollars are governed by Roth IRA rules — including the IRA's contributions-out-anytime ordering rule under IRC §408A(d)(4).

Does a designated Roth account have RMDs?

Not for the owner during their lifetime, as of 2024. SECURE 2.0 §325 eliminated lifetime RMDs from designated Roth accounts effective 2024. Before 2024, owners faced RMDs at age 72/73 for the Roth 401(k) portion, which was a disadvantage vs. Roth IRAs (which never had lifetime RMDs). That parity gap is closed. Inherited designated Roth accounts still face the SECURE Act 10-year rule for non-spouse beneficiaries.

Are designated Roth contributions tax-deductible?

No. Designated Roth contributions are after-tax — you pay income tax on the dollars before they go in. There's no current-year deduction. The benefit is tax-free qualified withdrawals later. Pre-tax 401(k) contributions, by contrast, are deductible (reduce current-year taxable income) but taxed on withdrawal.