H-1B 401(k) vs Roth: The Returnee Lens

Assuming the reader is on H-1B with an employer plan that offers both a pre-tax bucket and a Roth bucket, the conventional US-domestic framing reads roughly: capture the match, then prefer Roth when younger and pre-tax when older. That framing rests on one assumption — the withdrawal happens as a US tax resident. When a return to India is on the table over a long horizon, the assumption is doing more work than it appears, and the answer can change.

What follows is not a model that produces a single number. It is the shortlist of facts that should sit on the same page before the next open-enrolment deferral percentage is set.

1. The two buckets, mechanically

Bucket          Tax in now           Tax out (US)         Tax out (India after ROR)
Pre-tax 401(k)  Deduct now           Ordinary income      In scope under Sec 5(1); FTC via Art 25
Roth 401(k)     No deduction         $0 if qualified      No express exemption in IT Act
Employer match  Pre-tax by default,  Ordinary income      Same as pre-tax above
                Roth only if plan
                elects SECURE 604

Two structural points sit underneath that grid. First, the India column for Roth is not "zero" — it is "the Income-tax Act, 1961, contains no express Roth exemption, and the DTAA article that comes closest covers periodic pensions, not lump-sum withdrawals." That gap is material. Second, the employer match has historically been pre-tax, and remains pre-tax in most plans today; Roth matching is now permissible under SECURE 2.0 Section 604 but is a plan-by-plan election.

2. Why the US-domestic argument breaks at the border

The US-domestic Roth argument rests on a symmetric comparison: when the current marginal rate is lower than the projected retirement marginal rate, paying tax now (Roth) avoids a larger bill later. The arithmetic is clean when the same tax authority taxes both ends of the trade.

The returnee case is asymmetric. US tax is paid now on a Roth dollar at the H-1B-era federal-plus-state marginal rate, which varies by city and income but is generally a meaningful percentage. The withdrawal then occurs in India where, after the RNOR window ends, the dollar may be in scope under Section 5(1) of the Income-tax Act, 1961, on a worldwide basis — because there is no express Roth exemption in the statute.

Foreign tax credit may be available for any US tax actually paid on the same dollar, but a qualified Roth distribution carries zero US tax. Zero US tax means zero FTC available. Any Indian tax that lands stands alone.

That is the structural risk on the returnee path. It does not always trigger — RNOR can shield it, careful pre-departure planning can reduce it — but the moment the US-domestic answer is applied unchanged, an implicit bet has been made.

3. The RNOR window changes the pre-tax math

Section 6(6) of the Income-tax Act, 1961, defines Resident but Not Ordinarily Resident. The conditions are framed as alternatives: a returning individual qualifies as RNOR for a financial year if the individual was a non-resident in nine out of the ten previous years preceding that year, or was in India for a period of seven hundred and twenty-nine days or less during the seven previous years preceding that year. Either condition is sufficient. The number of RNOR years that result depends on each individual's facts; "two years" is a common pattern for a long-tenured NRI returnee, not a statutory cap.

During the RNOR window, the scope of Indian tax under Section 5 is narrowed. India-source income remains taxable, and income from a business controlled in or a profession set up in India also remains taxable, but other foreign-source income — including a 401(k) distribution — is outside scope.

This is the largest lever available on the returnee path, and it tilts the picture toward pre-tax for a reason that does not exist in the US-domestic argument. A pre-tax 401(k) distribution taken during RNOR pays US tax at non-resident-alien rates and no Indian tax. A Roth distribution taken in the same window pays no US tax (qualified) and no Indian tax (RNOR covers foreign-source income), so the wrappers look equivalent inside RNOR.

The difference appears outside the window. After RNOR ends and the individual becomes Resident and Ordinarily Resident (ROR), a pre-tax 401(k) dollar is fully taxed in India under Section 5(1) with FTC available under Section 90 and DTAA Article 25 for US tax paid. A Roth dollar enters the contested-interpretation zone — no express Indian exemption, no US tax paid, and so no FTC available to offset whatever Indian tax does land.

4. Three returnee archetypes

This is not a recommendation on which bucket to pick. It is a way to organise the question.

Archetype A — high likelihood of staying in the US through retirement. The cross-border layer is a hedge that costs little if it is never needed; the conventional US-domestic framing largely holds.

Archetype B — high likelihood of returning within ten years. The pre-tax bucket carries an asymmetric advantage because the RNOR window opens a path to withdraw or convert at a knowable rate. Choosing Roth in this scenario locks in today's US marginal rate against an Indian rate that is unsettled by statute.

Archetype C — genuinely uncertain. A split allocation across both buckets preserves both options. The precise split is a personal-facts question; the structural point is that one-bucket foreclosures are the expensive choice when the destination is uncertain.

The employer match continues to flow into the pre-tax 401(k) in nearly every plan because most plans have not elected the SECURE 2.0 Section 604 Roth-match feature. The plan documents are the source of truth.

5. What the contribution screen does not show

Three details that change the calculus and are not visible on the open-enrolment page:

• The 401(k) and the Roth IRA are separate vehicles with separate limits. For 2026, IRS Notice 2025-67 sets the 401(k) elective deferral limit at $24,500, the age-50 catch-up at $8,000, and the enhanced catch-up for ages 60-63 under SECURE 2.0 Section 109 at $11,250. The IRA contribution limit for 2026 is $7,500, with an age-50 catch-up of $1,100. The Roth IRA has income phase-outs; the Roth 401(k) does not. A high-income H-1B can be locked out of the Roth IRA while still using the Roth 401(k).
• Backdoor and mega-backdoor Roth strategies do not change the India-side analysis. Whichever route puts a dollar into the Roth wrapper, the Indian recognition question is the same.
• A "Roth conversion during RNOR" idea is not a free lunch. A Traditional-to-Roth conversion is a US taxable event — ordinary income tax at non-resident-alien rates on the converted amount. The motivation is that the rate may be lower than the H-1B peak. The Indian-side recognition of the resulting Roth, however, remains the same unsettled question. The US withholding mechanics, the Indian-side treatment, and the Form 67 filing under Rule 128 of the Income-tax Rules are the three points a cross-border CA conversation should cover before any execution.

6. A checklist for the cross-border CA conversation

These are the inputs a qualified cross-border CA will typically need before forming a view:

1. Current US tax status, marginal US rate, and projected return timeline
2. Existing 401(k) split between pre-tax and Roth, and current employer-match structure
3. Intended RNOR-window withdrawal strategy (full, partial, or none)
4. The CA's reading on India-side Roth treatment in the relevant assessment year
5. Whether a partial Roth conversion before departure is on the table
6. Form 67 filing mechanics under Rule 128 of the Income-tax Rules, 1962, where FTC will be claimed

The point of this list is not the answer it produces. It is that one conversation, before a wrapper choice is held for fifteen years, is a smaller cost than discovering the gap after the fact.

Sources:

• Income-tax Act, 1961 (full text PDF, IndiaCode): https://www.indiacode.nic.in/bitstream/123456789/2435/1/a1961-43.pdf — Sections 5, 6(6), 90
• Convention Between the Government of the United States of America and the Government of the Republic of India for the Avoidance of Double Taxation (DTAA), 1989: https://www.irs.gov/pub/irs-trty/india.pdf — Articles 20, 25
• Internal Revenue Code Section 408A (Roth IRAs): https://www.law.cornell.edu/uscode/text/26/408A
• Internal Revenue Code Section 402A (Designated Roth contributions to 401(k) plans): https://www.law.cornell.edu/uscode/text/26/402A
• IRS Notice 2025-67 — 2026 retirement plan contribution and benefit limits: https://www.irs.gov/pub/irs-drop/n-25-67.pdf
• SECURE 2.0 Act of 2022 (Public Law 117-328, Division T): https://www.congress.gov/117/plaws/publ328/PLAW-117publ328.pdf — Sections 109 (enhanced catch-up), 604 (Roth employer match)
• Income-tax Department e-Filing Portal (Form 67 filing under Rule 128 of the Income-tax Rules, 1962): https://www.incometax.gov.in/iec/foportal/