401(k) to Roth Conversion: The Rollover Path

What a 401(k) to Roth Conversion Actually Means

A 401(k) to Roth conversion is not the same as a rollover to a traditional IRA. A standard rollover from a 401(k) to a traditional IRA moves pre-tax money to another pre-tax account, and no tax is generally owed. A 401(k) to Roth conversion intentionally triggers a tax event: the pre-tax balance is reclassified as Roth, ordinary income tax is generally owed on the converted amount, and the money inside the Roth generally grows tax-free from that point forward under current law.

For an outside Roth IRA to receive the money, the investor generally needs a former-employer 401(k), a 401(k) the investor has separated from service on, or a plan that permits in-service distributions while still employed. Most plans restrict in-service distributions until age 59.5. Authority for the mechanics sits in IRC Section 402 (qualified plan distributions) and IRC Section 408 (IRA conversion rules). Roth conversions are generally irreversible under current law because the Tax Cuts and Jobs Act is generally understood to have eliminated recharacterization for conversions made after 2017.

Two Routes: Direct Roth IRA Rollover vs. Rollover IRA First

Option 1: Roll Directly to a Roth IRA

In a direct rollover, the 401(k) plan administrator transfers the full balance directly to a Roth IRA at the receiving custodian. The plan issues Form 1099-R, the full amount is generally added to the investor's ordinary income for the year, and the funds settle inside the Roth. No 20% federal withholding generally applies, because the money never passes through the investor's hands.

A 60-day indirect rollover works differently and carries a procedural trap. Under IRC Section 3405, the plan is generally required to withhold 20% federal income tax on the distribution before issuing the check to the investor. To complete a full Roth conversion of the original balance, the investor is generally required to deposit the entire pre-withholding amount into the Roth within 60 days, which means making up the withheld 20% from outside capital. If only the after-withholding amount is deposited, the missing 20% may potentially be treated as a taxable distribution, plus a 10% early-distribution penalty for investors under 59.5. Direct rollovers generally avoid this entirely.

The downside of Option 1 is concentration. The full pre-tax balance generally hits taxable income in a single year, potentially pushing into a higher bracket, potentially raising IRMAA premiums, and potentially increasing the taxable portion of Social Security benefits.

Option 2: Roll to a Traditional IRA First, Then Convert

The investor typically rolls the 401(k) to a traditional (rollover) IRA, a generally non-taxable trustee-to-trustee transfer under IRC Section 402(c). The investor then converts pieces of the IRA to a Roth IRA in separate tax years, which may give them bracket control across the conversion sequence.

Option 2 is also the path that opens the door to the NAV-discount strategy described below. A self-directed traditional IRA at a custodian that accepts alternative investments can hold a private real estate interest. The 401(k) cannot.

In-Plan Roth Conversion

Some 401(k) plans allow an in-plan Roth conversion: the investor converts a portion of the pre-tax balance, or after-tax contributions, into the plan's designated Roth 401(k) account without rolling out to an IRA. The tax event is generally identical to an outside conversion. In-plan Roth conversions may be useful for investors who want to begin building Roth balances while still employed and contributing. Required plan documents and a participant election form determine availability.

The limitation is investment scope. Money converted inside the 401(k) generally stays inside the 401(k), and private real estate interests are generally not available there. The NAV-discount strategy is generally not available inside an employer 401(k). Investors who want both options typically run a partial in-plan conversion alongside a separate rollover-to-IRA conversion when they later separate from service.

Roth 401(k) accounts have their own rule set distinct from Roth IRAs. Under SECURE 2.0, Roth 401(k) accounts are generally no longer subject to RMDs during the participant's lifetime. Roth 401(k) balances may be rolled to a Roth IRA on separation from service, at which point Roth IRA rules generally apply. The 5-year clock for tax-free earnings is generally tracked separately for the Roth 401(k) and any Roth IRA the investor holds.

The 401(k) to Roth Rollover Process: Step-by-Step

The mechanics of a 401(k) to Roth rollover generally follow a defined sequence. Each step involves coordination between the plan administrator, the destination IRA custodian, and the investor's tax preparer. The order below assumes Option 2 (rollover to a traditional IRA first, then convert), which is the most common path for investors planning to use bracket management or a NAV-discount strategy. The general process typically involves the following steps; individual circumstances vary, so confirm details with the plan administrator and a qualified tax professional before initiating any rollover.

1. The distribution package. The investor typically requests a distribution package from the 401(k) plan administrator. The package generally includes a distribution election form, a rollover instruction sheet, and any required spousal-consent paperwork. Investors may also request the 402(f) Special Tax Notice, which the plan is generally required to provide.
2. The destination account type. The investor typically chooses the destination account type. A direct rollover to a Roth IRA generally triggers the full tax event at once. A direct rollover to a traditional (rollover) IRA generally defers the tax event until a later conversion. Option 2 is the path many investors use to preserve bracket-management flexibility and access to self-directed strategies.
3. Opening the destination IRA. The investor typically opens the destination IRA at a custodian that supports the intended investment scope. For investors planning to hold private real estate fund interests, this generally means a self-directed IRA custodian that accepts private placements. Funding the account before the rollover paperwork is filed generally avoids settlement delays.
4. Coordinating withholding. The investor typically coordinates withholding with the plan and destination custodian. Direct trustee-to-trustee rollovers generally avoid the mandatory 20% withholding under IRC Section 3405. Indirect (60-day) rollovers generally trigger the withholding and require outside capital to replace the withheld amount inside the 60-day window.
5. Executing the rollover. The investor typically executes the rollover, and the 401(k) plan generally transfers the balance directly to the destination custodian. Investors generally confirm receipt at the destination account and verify the funds are coded as a rollover contribution, not a regular contribution.
6. Verifying the year-end tax forms. The investor typically verifies the year-end tax forms. The 401(k) plan generally issues Form 1099-R for the distribution, and the destination custodian generally issues Form 5498 confirming the rollover receipt. The codes on Form 1099-R determine how the transaction is reported on the investor's return.
7. Form 8606 if nondeductible basis is involved. The investor typically files Form 8606 if any portion of the rolled balance carries after-tax basis (such as after-tax 401(k) contributions), and Form 8606 generally tracks the basis going forward. Investors with no nondeductible basis generally do not need Form 8606 for the rollover step itself, but may need it later when the conversion occurs.

The full conversion sequence may span multiple tax years if the investor is using bracket-filling or a NAV-discount ladder. Each conversion step generally generates its own Form 1099-R and Form 5498. Investors may want to confirm timing with a qualified CPA before executing any step.

The Tax Bill

Under current law, a 401(k) to Roth conversion is generally taxed on the fair market value of the converted assets on the date of conversion. For a standard 401(k), that is generally the cash balance. For a self-directed traditional IRA holding a private real estate interest, it is generally the custodian-reported value reflecting the sponsor's third-party appraisal. The conversion is generally reported on Form 1099-R by the custodian and on Form 8606 by the investor.

An $80,000 conversion at a 22% effective federal rate would generate approximately $17,600 in federal tax. Bracket management matters because conversion income generally stacks on top of wages, Social Security, pensions, dividends, and capital gains. Investors may want to discuss projected total income for the conversion year with a qualified CPA before the rollover is executed.

A full 401(k) balance does not have to convert in one year. Under Option 2, converting $20,000 per year for four years generally keeps each conversion inside a lower bracket compared to a single $80,000 conversion. When each year's conversion funds a private real estate position at a NAV discount, the taxable amount per conversion may be further reduced. The conversion ladder and the NAV discount are independent levers that may stack.

Can You Convert a 401(k) to Roth Without Paying Taxes?

For pre-tax 401(k) balances, the general answer is no. Pre-tax money that has never been taxed generally gets taxed on the way into the Roth, and the conversion event is what triggers that tax. The NAV-discount strategy described elsewhere in this article may potentially reduce the taxable amount, but it generally does not eliminate it. There is no broadly available technique under current law that converts a pre-tax 401(k) to a Roth IRA with zero federal tax. Confirm the tax treatment of any rollover with a qualified tax professional.

Two narrow edge cases are sometimes confused with a tax-free conversion. First, an already-Roth 401(k) account may generally be rolled to a Roth IRA without a new tax event, because the money has already been taxed. The 5-year clock generally requires careful tracking: the Roth IRA 5-year clock for tax-free earnings is generally separate from the Roth 401(k) clock, and rolling Roth 401(k) money to a Roth IRA may potentially restart the clock for the new account in some circumstances. Investors should confirm clock treatment with a qualified CPA.

Second, after-tax (non-Roth) contributions inside a 401(k) may potentially be converted to Roth without a new tax event on the basis portion, because that money has already been taxed. The earnings on the after-tax contributions generally remain taxable at conversion. This is the mechanism behind the Mega Backdoor Roth strategy, which requires a plan that allows after-tax contributions and either in-plan conversions or in-service distributions. For the full mechanics, see Mega Backdoor Roth Conversion.

Worked Example: Karen's 401(k) Rollover at 60

Consider a hypothetical involving Karen, 60, with a $50,000 401(k) from a job she left at 52. Her current income is moderate. She expects higher income from Social Security and a pension starting at 65, and her CPA advises converting before those sources kick in while she is still in the 22% bracket.

Karen rolls the $50,000 to a self-directed traditional IRA at a custodian that accepts private placements (a generally non-taxable trustee-to-trustee transfer under IRC Section 402(c)). She then contributes the IRA funds to a ground-up multifamily development LP interest building a Class B/A apartment community with a 7-year hold horizon. Multifamily development generally carries higher lack-of-control and lack-of-marketability discounts than stabilized assets because there is no operating income during construction and lease-up and the LP interest is generally illiquid through stabilization. The sponsor's appraisal firm establishes a 25% NAV discount, within a typical 25 to 40% range for ground-up multifamily development, and reports $37,500 to the custodian.

At conversion, the taxable amount would be approximately $37,500, not $50,000. At 22%, the conversion tax would be approximately $8,250. Converting at full nominal value would have generated approximately $11,000. Illustrative savings: approximately $2,750. Karen pays the $8,250 from savings outside the IRA so the full $37,500 basis stays inside the Roth and compounds tax-free. In this illustration, if the deal exits at year 7 with capital returned plus any potential capital appreciation flowing back to the investor, the proceeds would sit in Karen's Roth IRA and subsequent qualified distributions would generally be income-tax-free. The 25% discount is an educational illustration. Actual tax outcomes depend on individual circumstances. Consult a qualified tax professional before executing any conversion. All investments carry risk, including the loss of principal. Investors should read the risk factors in the private placement memorandum for each offering before investing.

Worked Example: Tom's Post-Job-Change Rollover at 38

Consider a hypothetical involving Tom, 38, who just left a tech company after nine years. He has a $180,000 401(k) with his former employer's plan and 25-plus years before standard retirement age. He wants to move the money to Roth but does not want a $180,000 income spike in one year.

Tom rolls the $180,000 to a self-directed traditional IRA (no tax event), then converts $60,000 per year for three years, staging each conversion to stay within his 24% bracket. Each year's conversion funds an oil and gas drilling fund LLC membership interest that will fund the drilling of a series of horizontal wells. Drilling fund LLC interests typically carry larger lack-of-control and lack-of-marketability discounts than stabilized real estate because the underlying reserves deplete over time, commodity prices fluctuate, the production curve is uncertain through the drilling and completion phases, and there is no secondary market for the LLC interest. The sponsor's appraisal firm establishes a 50% NAV discount, within a typical 40 to 60% range for drilling fund LLC interests, and reports $30,000 to the custodian.

At 24%, the conversion tax would be approximately $7,200 per year instead of $14,400, a potential saving of $7,200 per conversion year or roughly $21,600 across the three-year cycle. Tom pays each year's tax with outside capital.

Hold and distributions. Over the fund's life, production distributions plus any potential residual reserves value at fund termination would flow back to Tom's Roth IRA, and subsequent qualified distributions from the Roth would generally be income-tax-free. By the end of year three, his traditional IRA balance would be zero. The 50% discount is an educational illustration. Actual tax outcomes depend on individual circumstances. Consult a qualified tax professional before executing any conversion. All investments carry risk, including the loss of principal. Investors should read the risk factors in the private placement memorandum for each offering before investing.

What Are the Disadvantages of Rolling a 401(k) to a Roth IRA?

A 401(k) to Roth IRA rollover is not always the right move, even when the long-term tax math looks favorable. Several features of an employer 401(k) generally do not carry over to an IRA, and investors who leave money inside the 401(k) may potentially retain advantages that disappear once the balance moves out. The disadvantages below generally apply to any 401(k) to Roth IRA rollover, regardless of bracket-management or NAV-discount strategy.

• Loss of penalty-free distributions at age 55. Under the separation-from-service rule in IRC Section 72(t)(2)(A)(v), an investor who separates from service in or after the year they turn 55 may generally take distributions from that employer's 401(k) without the 10% early-distribution penalty. The rule generally does not apply to IRAs, where the standard age-59.5 threshold generally controls. An investor who plans to retire between 55 and 59.5 may potentially lose penalty-free access by rolling out.
• Loss of stronger creditor protection. 401(k) plans are generally governed by ERISA, which provides broad federal creditor protection in most bankruptcy and judgment scenarios. IRA creditor protection generally depends on state law and can vary substantially. Investors in states with weaker IRA protection may potentially lose meaningful asset-protection coverage when moving money out of the 401(k).
• Loss of the NUA (Net Unrealized Appreciation) election on company stock. Under IRC Section 402(e)(4), employer stock distributed in-kind from a 401(k) as part of a lump-sum distribution may potentially be taxed at ordinary income rates only on the cost basis, with the appreciation generally taxed at long-term capital gains rates when later sold. Rolling the stock into an IRA generally forfeits the NUA election, and the full value generally converts to ordinary income treatment when distributed. Investors holding highly appreciated employer stock may want to evaluate NUA before rolling out.
• Immediate tax bill on the conversion amount. The full converted balance is generally added to ordinary income in the conversion year. Concentration in a single year may potentially push the investor into a higher marginal bracket, raise Medicare IRMAA premiums for two years after the conversion, and increase the taxable portion of Social Security benefits. Bracket management through a multi-year ladder may potentially mitigate this, but the tax is still owed.
• Roth 5-year clock reset on each conversion. Each Roth conversion generally starts its own 5-year clock under IRC Section 408A(d)(2)(B). Converted principal may potentially become available penalty-free after 5 years from January 1 of the conversion year, or after age 59.5, whichever comes first. Investors planning to access converted money before age 59.5 may potentially face penalty exposure if the clock has not run.

None of these disadvantages necessarily rule out the rollover, but they generally argue for evaluating the full picture before executing. Investors may want to compare the 401(k)'s investment menu, fee structure, and creditor protection against the IRA's broader investment scope and bracket-management flexibility before deciding. For the full list of Roth conversion mistakes across all strategies, see Roth Conversion Mistakes.

403(b) Rollovers

A 403(b) is the nonprofit and education-sector equivalent of a 401(k). The mechanics are generally identical: roll to a traditional IRA generally tax-free under IRC Section 403(b)(8), then convert portions to Roth in separate tax years. In-plan Roth conversion may also be available within the 403(b) itself if the plan documents allow it.

Some older 403(b) plans, particularly those holding annuity contracts, may carry surrender charges or restrictions on moving money out while the participant is still employed by the same institution. Once separated from service, those restrictions usually lift. Investors may want to request a copy of the plan's distribution policy and any annuity contract terms before initiating a rollover. The annual IRA contribution limit generally does not apply to rollover amounts. Rollovers from 403(b) plans are generally unlimited in dollar size.

The Pro-Rata Rule

The pro-rata rule under IRC Section 408(d)(2) is generally understood to require that any IRA conversion treat the IRA aggregate as one pool of pre-tax and after-tax money. An investor with $90,000 of pre-tax and $10,000 of nondeductible basis (a $100,000 aggregate) who converts $10,000 would generally have 90% ($9,000) treated as taxable and 10% ($1,000) as nontaxable return of basis. The investor is generally not able to cherry-pick the after-tax bucket.

The pro-rata rule generally does not apply to direct 401(k) to Roth conversions for pre-tax 401(k) balances. The 401(k) is its own account, so 100% of a conversion of that balance is generally taxable, and the math is straightforward. The pro-rata issue generally arises only when the investor has nondeductible basis sitting in a traditional, SEP, or SIMPLE IRA at the time of conversion. Investors often roll existing IRA balances back into a current-employer 401(k) before a backdoor Roth to isolate the after-tax basis.

IRS Notice 2014-54 addresses 401(k) money split between pre-tax and after-tax portions: the after-tax basis may potentially be directed to a Roth IRA in a separate trustee-to-trustee transfer while the pre-tax portion rolls to a traditional IRA, potentially avoiding aggregation.

Lowering the Tax Cost With a NAV Discount

A discounted Roth conversion may potentially reduce the taxable basis itself, not just spread it across years. The mechanism generally works only on Option 2. When the converted asset is a private real estate fund interest, the fund sponsor engages a third-party appraisal firm under Revenue Ruling 59-60 factors. The sponsor then reports the discounted value to the IRA custodian. At conversion, the taxable amount is generally the discounted value, not the subscribed amount. This is standard IRS valuation guidance generally applied to illiquid private interests, the same framework appraisers generally use for estate and gift purposes.

For the full mechanics, see how the NAV-discount strategy works, the valuation framing, the multi-year conversion ladder, and the 5-year rule for converted principal.

Frequently Asked Questions

Sources

This article references the following IRS publications and Internal Revenue Code sections.

• 26 U.S.C. Section 402, Distributions from Qualified Employer Plans (Cornell Law)
• 26 U.S.C. Section 408, Individual Retirement Accounts (Cornell Law)
• 26 U.S.C. Section 408A, Roth IRAs and conversion rules (Cornell Law)
• 26 U.S.C. Section 3405, Mandatory withholding on plan distributions (Cornell Law)
• IRS Notice 2014-54, Allocation of After-Tax Amounts to Rollovers
• IRS Form 1099-R, Distributions From Pensions, Annuities, Retirement or Profit-Sharing Plans
• IRS Form 8606, Nondeductible IRAs
• IRS Publication 590-A, Contributions to Individual Retirement Arrangements
• IRS Publication 590-B, Distributions from Individual Retirement Arrangements
• Revenue Ruling 59-60, Valuation of Closely Held Stock
• SECURE 2.0 Act of 2022, Roth 401(k) RMD elimination and related provisions