Roth Solo 401(k) vs Roth IRA for a Six-Figure Contractor: Income Limits Are Not the Whole Story

The question high earners ask, and the one they should ask

A contractor earning six figures usually frames the Roth question as "am I over the Roth IRA income limit?" It is a fair question. For 2026 the Roth IRA phase-out for a single filer begins around $153,000 of modified adjusted gross income and for a joint filer around $242,000, and a contractor netting $180,000 alone is out.

But the income limit is the least interesting difference between the two Roth options a self-employed person has. The Roth Solo 401(k) has no income limit, allows more than three times the contribution, sits inside a plan with different withdrawal rules, and interacts differently with the employer contribution and with required minimum distributions. The Solo 401(k) for high earners page covers the plan generally; this article is about the Roth choice specifically.

The contribution gap

Roth IRA: $7,500 for 2026, plus a $1,100 catch-up at 50 and older. Subject to the income phase-out. Contributions can be made until April 15 of the following year.

Roth Solo 401(k): the employee deferral of $24,500 for 2026 can be designated Roth, and the age-50 catch-up on top of it can be Roth as well. No income limit. The election must be made in writing by December 31 of the plan year, though the deposit can follow up to the extended return due date.

For a contractor netting $150,000, the Roth Solo 401(k) deferral is $24,500 of Roth room versus $7,500 in a Roth IRA, if the IRA is available at all. Add the pre-tax employer contribution of roughly 20 percent of adjusted net earnings, about $27,900, and the Solo 401(k) total is about $52,400 against the $72,000 ceiling ($80,000 at 50 and older).

The withdrawal rules are different

This is where the two accounts genuinely diverge.

Roth IRA. Contributions can be withdrawn at any time, tax- and penalty-free, because they were already taxed. Earnings are tax-free after five years and age 59 and a half. There are no required minimum distributions during the owner's lifetime. For a contractor with variable income, the ability to pull contributions back out in a bad year is a meaningful feature.

Roth Solo 401(k). Withdrawals before 59 and a half are generally limited to what the plan document permits, typically hardship, loans, or separation from service (which for a sole proprietor means closing the business). A non-qualified distribution is pro-rated between contributions and earnings, so you cannot pull out only the contributions. Since 2024, Roth 401(k) accounts are no longer subject to lifetime RMDs, removing what used to be a real disadvantage. Loans of up to the lesser of $50,000 or half the vested balance are available if the plan allows, which a Roth IRA never permits.

So the Roth IRA is more liquid on the way out; the Roth Solo 401(k) is bigger on the way in and offers loans.

The five-year clocks are separate

Each Roth IRA owner has one five-year clock that starts with the first Roth IRA contribution. A Roth Solo 401(k) has its own five-year clock that starts with the first Roth deferral to that plan. A contractor who has held a Roth IRA for a decade and opens a Roth Solo 401(k) in 2026 starts a new clock for the plan. If the plan is later rolled into the Roth IRA, the IRA's clock governs, which is one reason many high earners keep a small Roth IRA open even when they cannot contribute to it.

The employer contribution is (usually) pre-tax

SECURE 2.0 allows a plan to permit Roth employer contributions, but adoption by prototype plan sponsors has been slow. As of 2026 many Solo 401(k) documents still treat the employer piece as pre-tax only. In practice, a contractor's Solo 401(k) is a hybrid: Roth deferral, pre-tax employer contribution. That is not a flaw. The pre-tax employer piece is a current-year deduction, which at a 24 or 32 percent marginal rate is worth having, and the Roth deferral captures tax-free growth on the piece with the longest horizon.

The backdoor and the mega-backdoor

Backdoor Roth IRA. A contractor over the Roth IRA income limit can contribute $7,500 to a non-deductible traditional IRA and convert it. This works cleanly only if the contractor has no other pre-tax IRA balances, because the pro-rata rule taxes the conversion in proportion to all IRA assets. A SEP IRA balance defeats it. A Solo 401(k) balance does not, because 401(k) assets are not IRAs. This is a quiet argument for the Solo 401(k) over the SEP for anyone who wants to run a backdoor.

Mega-backdoor. A Solo 401(k) whose document allows after-tax (non-Roth) contributions and in-plan Roth conversions lets a contractor fill the gap between deferral plus employer contribution and the $72,000 ceiling with after-tax money, then convert it to Roth. For the $150,000 earner above, that is roughly $19,600 of additional Roth room. Not every provider supports it; check before adopting.

A decision framework

• •Income under the Roth IRA limit and you want liquidity: fund the Roth IRA first, then Roth deferrals in the Solo 401(k).
• •Income over the limit: Roth Solo 401(k) deferral is your primary Roth vehicle; consider a backdoor Roth IRA if you have no pre-tax IRA balances.
• •High marginal rate this year, expect lower later: consider pre-tax deferral instead of Roth; the employer piece is pre-tax regardless.
• •Low marginal rate this year (a slow year): Roth everything you can.
• •Any year: make the deferral election in writing by December 31, or the Solo 401(k) deferral, Roth or otherwise, is gone.

Two footnotes

Saver's Match. Starting January 1, 2027, lower-income savers earn up to $1,000 from the Treasury on qualifying contributions, including Roth contributions (though the payment cannot be deposited into a Roth), under MAGI phase-outs of $20,500 to $35,500 single, $30,750 to $53,250 head of household, and $41,000 to $71,000 joint. A six-figure contractor is over the limits, but a spouse with part-time income may not be, and the match must land in a non-Roth IRA. The Saver's Match Roth rule page explains it.

Growth illustration. At 6% annual growth, the rate the Treasury uses in its own projections and not a prediction, $24,500 a year of Roth deferrals for twenty years grows to roughly $900,000, all of it tax-free on qualified withdrawal. The same twenty years of $7,500 Roth IRA contributions reaches about $276,000. Returns are not guaranteed. The free Gigaverse tools run both from your own net earnings.

Where Gigaverse fits

Gigaverse is a subscription retirement app for people with 1099 income. Today it offers a Roth IRA through a FINRA/SIPC-member broker-dealer. Applications for a Solo 401(k) and a SEP IRA are open at gigaverse.ai/solo-401k and gigaverse.ai/sep-ira: you apply, a person confirms your eligibility and sends your plan documents, then you fund before the deadline, Roth or pre-tax. It also computes your deferral and employer limits, tracks contributions across the accounts you hold, flags the December 31 election, and hands the numbers to your CPA. Gigaverse is pursuing SEC RIA registration and does not guarantee returns. The full guide is on the Solo 401(k) for high earners page.