Roth Conversion Strategy for Private Equity Professionals

PE professionals earning above the Roth IRA income phase-out cannot contribute directly — but there is no income limit on Roth conversions. This guide covers the backdoor Roth, the SEP-IRA pro-rata trap that kills it for many PE partners, the mega backdoor Roth through a ManCo S-Corp, and how to identify the low-income windows where conversions are cheapest. Not tax or investment advice; your specific situation and fund documents govern.

Why PE professionals can't just open a Roth IRA

The 2026 Roth IRA income phase-out begins at $153,000 MAGI for single filers and $242,000 for married filing jointly — and it eliminates entirely at $168,000 single / $252,000 MFJ.¹ A PE partner earning $350,000 in management fees alone — before any carry distribution — is above those thresholds. A partner who receives a $3M carry distribution in a given year is 20× above them.

Income for Roth IRA eligibility purposes is Modified Adjusted Gross Income. Carried interest distributions flow from Schedule K-1 to Schedule E to AGI and are therefore included in MAGI for Roth eligibility purposes. So are management fees, salary, and any other income. In any year with a meaningful carry distribution, direct Roth contributions are unavailable.

The backdoor Roth: contributing without the income limit

The backdoor Roth is a two-step workaround that allows high-income earners to fund a Roth IRA:

1. Make a non-deductible contribution to a traditional IRA. Anyone with earned income can contribute to a traditional IRA regardless of income level — the question is only whether the contribution is deductible. At PE-level incomes, it is not deductible. The 2026 IRA contribution limit is $7,500 (under age 50) or $8,600 (age 50+, with the $1,100 catch-up contribution).¹ The non-deductible nature is tracked on IRS Form 8606.
2. Convert the traditional IRA to Roth immediately. Convert the non-deductible balance to a Roth IRA. Because you already paid income tax on this money (it was non-deductible), the conversion creates minimal additional taxable income — provided no other pre-tax IRA balances exist.

Done cleanly, the backdoor Roth moves $7,500–$8,600 per year (per spouse) into a Roth account with no income limit and minimal tax cost. Over a 20-year career, at $7,500/year per spouse, that's $300,000+ growing tax-free — modest relative to PE-scale wealth, but a meaningful tax-diversification asset at retirement.

The pro-rata trap: why SEP-IRA balances destroy the backdoor Roth

The backdoor Roth works cleanly only when you have no other pre-tax IRA balances. When you do, the IRS's pro-rata (aggregation) rule applies — and it eliminates most of the tax benefit.

Under IRC § 408(d)(2), all of your traditional IRAs, SEP-IRAs, and SIMPLE IRAs are treated as one single IRA for purposes of calculating the taxable portion of any distribution or conversion.² The IRS doesn't allow you to selectively convert "just the non-deductible portion."

The problem for PE professionals is acute: many have accumulated significant balances in SEP-IRAs for management fee income, or rolled a prior-employer 401(k) into a traditional IRA when joining a PE firm. A $500,000 SEP-IRA doesn't kill the backdoor Roth outright — but it means you're paying 37% income tax on 98.5% of the $7,500 conversion. That's nearly $2,800 in tax to contribute $7,500 to a Roth. Marginal benefit: roughly $0 of extra after-tax Roth dollars, after tax costs.

The fix: roll your SEP-IRA into the solo 401(k)

The most effective solution is to roll your SEP-IRA balance into your ManCo solo 401(k). A qualified 401(k) plan is not included in the IRA aggregation rule for pro-rata purposes. Once the SEP balance is inside the 401(k), the backdoor Roth is clean again.

Requirements: the solo 401(k) plan document must explicitly allow incoming rollovers (most do, but verify). The rollover is tax-free as a trustee-to-trustee transfer. After the rollover, the SEP-IRA account has a zero balance — and any future non-deductible IRA contributions can be converted to Roth with no pro-rata tax.

Timing consideration: the rollover must be complete before December 31 of the year in which you want the clean backdoor Roth. The IRS looks at IRA balances as of December 31 to determine the pro-rata ratio, using Form 8606 Part I line 6.

Mega backdoor Roth: larger contributions through the ManCo solo 401(k)

The backdoor Roth's $7,500–$8,600 annual limit is modest. The mega backdoor Roth can move significantly more into Roth — but only if your solo 401(k) plan allows after-tax contributions and in-plan Roth conversions.

The mechanics: in addition to the standard pre-tax employee deferral ($24,500 in 2026; $32,500 at age 50+; $35,750 at ages 60–63 with the super catch-up¹) and the employer profit-sharing contribution (up to 25% of W-2 salary), the § 415 total contribution limit allows additional after-tax employee contributions. Those after-tax contributions can be converted to Roth inside the plan (in-plan Roth rollover) or rolled out to a Roth IRA.

In this example, the partner can move $10,000 into Roth each year through the mega backdoor, on top of the $7,500 backdoor IRA contribution. Combined: $17,500/year into Roth accounts, fully legal, no income limit.

For older partners or higher W-2 salaries, the employer profit-sharing contribution may consume more of the § 415 room, reducing the after-tax bucket. Modeling the optimal salary level for a ManCo S-Corp to maximize both pre-tax retirement savings and Roth opportunity is one of the key planning exercises the ManCo S-Corp calculator addresses.

Critical requirement: the solo 401(k) plan document must specifically permit after-tax employee contributions and in-plan Roth conversions. Many off-the-shelf plan documents do not include these provisions. If your current plan document doesn't allow it, you'll need to amend the plan or switch plan providers before making after-tax contributions.

Roth conversions: when and how much to convert

Converting existing pre-tax IRA or 401(k) balances to Roth is a separate strategy from the backdoor Roth. You pay ordinary income tax on the converted amount in the year of conversion — the goal is to do this in years when your marginal rate is low relative to your expected future rate.

The PE income pattern creates real Roth conversion windows

Most PE professionals have income that is extremely lumpy: years with no carry distribution followed by years with $2M–$10M+ of carry income. The low-income years are often ideal for Roth conversions, because your marginal rate on the converted amount may be 22–32% rather than 37%.

The key insight: PE professionals leaving a firm, taking a sabbatical, or transitioning to an operating role often face a 12–24 month window of dramatically lower income. A partner who earned $500K + $4M in carry last year may earn only $200K this year while between firms. Converting $200,000–$400,000 of IRA/rollover assets to Roth during that window — at 32–35% rather than 40.8%+ — captures the rate differential permanently.

How carry K-1 income affects Roth conversion decisions

Carry distributions affect two things simultaneously:

• Roth contribution eligibility: Carry flows to MAGI. A $1M carry year puts you far above the $252K MFJ phase-out. This makes direct Roth contributions unavailable — but the backdoor Roth and conversions are still available regardless of income.
• The cost of Roth conversions: A Roth conversion in a carry year is taxed on top of the carry income. If you're already at 37% ordinary income on your management fee income, and carry adds $3M at 23.8% LTCG, a Roth conversion adds more dollars at 37% ordinary income (conversions are always ordinary income, never capital gains). Conversions in carry years are expensive — do them in lean years.

The AMT planning guide makes a related point about ISO exercises:³ stacking Roth conversions + carry + ISO exercises in the same year is costly because it concentrates multiple ordinary income events at maximum rates. Spread them across years when carry timing allows it.

Estate planning value of Roth accounts for PE professionals

PE estate planning challenges are substantial: illiquid carry, GP commitment obligations, and ManCo equity are hard to give away, hard to insure, and hard to liquidate for estate taxes. Roth accounts are uniquely valuable in this context:

• No lifetime RMDs: Traditional IRAs require Required Minimum Distributions starting at age 73 (born 1951–1959) or 75 (born 1960+) under SECURE 2.0 § 107. Roth IRAs have no lifetime RMDs — the balance can grow tax-free indefinitely during your lifetime. SECURE 2.0 § 325 also eliminated RMDs on Roth 401(k) accounts starting in 2024, giving the same benefit inside the plan.⁴
• Income-tax-free inheritance: Roth IRA beneficiaries receive distributions income-tax-free (though the 10-year rule under the SECURE Act still requires inherited Roth balances to be distributed within 10 years for non-spouse beneficiaries). A $500K Roth IRA passed to a child has the same face value after-tax as a $750K traditional IRA — the Roth carries no embedded tax liability.
• No carryover basis complexity: Carry, GP commitment interests, and portfolio company equity all have basis and character tracking complexities. Roth accounts are simple: contribute post-tax, withdraw tax-free. This is genuinely valuable for an estate that is otherwise complex.

For PE partners who have accumulated $5M–$50M+ of illiquid PE wealth and face a potentially large estate tax bill, Roth accounts won't solve the estate tax problem — but they provide the most tax-efficient liquid asset to pass, and their lack of RMDs avoids forced distribution income that could affect IRMAA, Medicare, or Social Security benefit taxation during retirement. See the estate planning guide for the full PE estate planning framework, and the IRMAA planning guide for how Roth income doesn't factor into the Medicare IRMAA calculation.

Common mistakes PE professionals make with Roth planning

1. Assuming "I make too much money for Roth"

The income limit applies to direct contributions only. The backdoor Roth is available to any income level. Roth conversions are available to any income level. Many PE professionals have never opened a Roth account because a generalist advisor told them they earn too much — without explaining that conversions and the backdoor workaround exist.

2. Not fixing the pro-rata trap before doing backdoor Roth

If you have a SEP-IRA or rollover IRA with pre-tax balances and attempt a backdoor Roth, you'll owe significant tax on the conversion due to pro-rata. The fix — rolling the SEP or rollover IRA into the ManCo solo 401(k) — typically takes one year to execute cleanly but permanently resolves the issue.

3. Doing Roth conversions in carry distribution years

Carry years are the worst time to convert: you're already at peak marginal rates, and the conversion income stacks on top. If you have flexibility — for example, a retirement account you've been planning to convert over several years — lean into lean years and skip conversion in carry years.

4. Not having a solo 401(k) that allows after-tax contributions

Most self-directed or plan-provider solo 401(k) documents don't include after-tax contribution and in-plan Roth conversion provisions. If mega backdoor Roth is part of your plan, verify the plan document before the tax year you intend to make after-tax contributions. Amending after year-end is complex.

5. Not counting Roth in the estate plan

Roth accounts are the most estate-efficient liquid assets most PE professionals own. Including them in an integrated estate plan — alongside ILIT, GRAT, and dynasty trust structures — maximizes their value. See the PE estate planning guide for how they fit.

Roth planning checklist for PE professionals