This document summarizes statutory provisions of the Internal Revenue Code in conjunction with IRS guidance pertaining to the popular “backdoor Roth” and “mega backdoor Roth” strategies. These strategies allow for fuller utilization of the tax-privileged retirement savings account known as the Roth IRA.
Contributions may annually be made into either a traditional or Roth IRA up to a certain limitation on the total of annual contributions.1 Typically, contributions to a traditional IRA are tax-deductible (“pre-tax”),2 and allocation of funds between traditional and Roth IRAs up to the total limitation may be performed in any proportion desired.3 However, as modified adjusted gross income increases, the proportion of contributions to traditional IRAs which are tax-deductible and the total annual limitation of contributions to Roth IRAs both phase out to zero.4 For example, in 2019, the phaseouts for single filers respectively begin at $64,000 and $122,000 for traditional and Roth IRAs.5
Non-deductible contributions. Notably, non-deductible (“after-tax”) contributions can be made into a traditional IRA up to the general limitation of total IRA contributions irrespective of income.6 Additionally rollovers of traditional IRAs may be performed into Roth IRAs irrespective of income.7 Performing these two steps in sequence constitutes the “backdoor Roth” strategy (BRS).
A complication arises when executing the BRS with existing pre-tax contributions in a traditional IRA. This may arise as a result of tax-deferred contributions in the past, rollovers from the pre-tax portions of 401(k) plans, or from execution of the MBRS such that pre-tax earnings on after-tax contributions are rolled over into a traditional IRA.
Notably, the tax consequences of distributions from traditional IRAs must be calculated as though all traditional IRAs were aggregated together into a single account.8 To illustrate, suppose $2,000 of regular, tax-deductible contributions have been made into a traditional IRA. Subsequently, the BRS is attempted by executing a $6,000 after-tax contribution into a different traditional IRA. If $6,000 is subsequently distributed from the traditional IRA into a Roth IRA, it will constitute a distribution of $1,500 in pre-tax funds and $4,500 in after-tax funds into the Roth IRA, with ordinary income taxes assessed on the $1,500 of pre-tax funds. This occurs because the two traditional IRAs are aggregated together for the purpose of the distribution and the distribution is therefore subject to pro-rata allocation between the $2,000 of pre-tax funds and the $6,000 of after-tax contributions.
In this circumstance, if the pre-tax funds in preexisting traditional IRA(s) are rolled over into a 401(k) plan, they will no longer be subject to the aggregation rule.9 If planning on future execution of the MBRS, it is advisable to select as the rollover destination the account in your 401(k) plan in which elective deferrals are held.
Whereas regular contributions (excluding earnings) to a Roth IRA may be withdrawn at any time without tax or penalty, contributions via the BRS are conversion contributions and thus subject to a 5-taxable-year waiting period before tax- and penalty-free withdrawal (again excluding earnings).10 Consequently, whenever possible, regular contributions should be made into a Roth IRA instead of conversion contributions through the BRS into the Roth IRA.
An annual limitation exists on “traditional” contributions to 401(k) plans, which are deducted from an employee’s paycheck by the employer and not subject to income taxes.11 These are referred to as elective deferrals and may be designated as either “traditional” or “Roth.” Additionally, 401(k) plans are subject to a strictly greater limit on the sum of all annual contributions,12 In 2019, these limitations were $19,000 and $56,000 respectively.13 As such, even when an individual meets the limitation on elective deferrals, there is typically still considerable room left over for employee contributions (referred to colloquially as “after-tax contributions”). It is possible to perform a distribution of after-tax contributions (and earnings thereon) into a Roth IRA while leaving elective deferrals untouched.14
After-tax contributions. 401(k) plan providers may allow after-tax contributions to be made into a separate account.15 Separate after-tax accounts must record earnings and losses specific to the after-tax contributions without commingling them with other funds such as elective deferrals.16 Additionally, in situations where this separate accounting is performed, plan providers may offer participants the option of choosing from which account a distribution is performed.17 Earnings made within the after-tax account are considered pre-tax balances within the account.18 When a distribution is made from an after-tax account, the distributed funds are taken proportionally from the pre-tax and after-tax balances in the account.19
Conversions. Although distributions of elective deferrals from 401(k) plans are only generally allowed after age 59.5,20 there appears to be no corresponding limitation on distributions of after-tax contributions.21 A distribution from a 401(k) plan, necessarily including distributions from after-tax accounts within a 401(k) plan, may be rolled over directly to a Roth IRA, with taxes owed on the earnings.22 Additionally, instead of rolling over the entire balance into a Roth IRA, some or all of the pre-tax earnings can be rolled over to a traditional IRA and the after-tax contributions can be rolled over to a Roth IRA in a single distribution.23. Either of these options constitute complete execution of the “mega backdoor Roth” strategy (MBRS).
There is no statutory limitation on the frequency with which the above steps may be performed.
Since the MBRS executes a conversion contribution into a Roth IRA, such contributions, like those performed with the BRS, are subject to a 5-year limitation on penalty-free withdrawal.
In general, 401(k) plans are subject to two nondiscrimination tests known as the actual contribution percentage test (“ACP test”) and the actual deferral percentage test (“ADP test”), as well as the top-heavy test, which impose penalties or require the reversal of plan contributions if high-income employees contribute in excess to their 401(k) plans. Although plans can be designed with an employer match such that they are exempt from all three tests (“safe harbor 401(k)s”), the presence of after-tax contributions into a 401(k) means such an exemption does not fully apply to the ACP and top-heavy tests.
Terminology. The ADP and ACP tests classify employees as highly compensated (HCEs) or as non-highly compensated (NHCEs). HCEs consist of those who (1) in a given year or in the year prior owned more than 5% of the company at any point in time or (2) or who in the year prior had compensation greater than an annually increasing limit (e.g., $125,000 if the preceding year is 2019) and, if the employer chooses to exercise this option, was in the top 20% of employees ranked by compensation in the prior year.24 All other employees are NHCEs. Similarly, the top-heavy test examines the contributions of “key employees,” which are those who, for any given year, (1) has compensation for that year exceeding an annually increased limit ($180,000 in 2009), (2) owns more than 5% of the company, or (3) owns more than 1% of the company and has compensation for that year greater exceeding $150,000.25
Testing conditions. Let an employee’s “contribution percentage” for a given year denote the ratio of their after-tax contributions plus matching contributions to their compensation for the year. A plan meets the ACP test in a given year if, for either the given year or the year prior according to the employer’s choice, the average HCE contribution percentage does not exceed the greater of (1) 125% of the NHCE average contribution percentage or (2) the lesser of (a) 200% of the NHCE average contribution percentage (b) the NHCE average contribution percentage plus 2 percentage points.26 A plan meets the ADP test if it satisfies the same conditions as in the ACP test when contribution percentages are calculated instead with elective deferrals.27 Finally, a plan meets the top-heavy test in a given year when the total value of the accounts of key employees does not exceed 60% of the total value of all accounts plan on the testing date, which is the last day of the prior year (or the given year for newly established plans).28 For the top-heavy test, account value is calculated after various modifications, such as adding back all in-service distributions in the five-year period ending on the testing date and subtracting rollovers into the plan from unrelated sources (such as traditional IRAs).29
ACP and ADP details. For the ACP and ADP tests, limits are imposed on HCE contributions in a given year based on NHCE contributions either in the current year or the prior year. For the calculation of such limits, an employer can always switch from using the prior year to using the current year,30 but cannot switch from using the current year to using the prior year if the preceding five years (or up to the creation of the plan) were not all tested using the current year method.31 If a plan satisfies the safe harbor exemptions for either test (described below), it is considered to be using the current year testing method.32 An employer does not have to use the same testing method (current year or prior year) for both the ACP and ADP tests.33 However, once a nonelective or matching contribution is used to satisfy any ACP or ADP test or a safe harbor requirement, it can no longer be used o satisfy any other ACP or ADP test (including future tests).34
Penalties. If a 401(k) plan fails either the ACP or ADP tests, the employer must distribute excess contributions to HCEs,35 contribute into the 401(k) plans of NHCEs,36 or a combination of both until the plan satisfies both tests. Moreover, if a 401(k) plan fails the top-heavy test, the employer must make additional contributions to each non-key employee’s 401(k) plan so that employer contributions to each non-key employee’s 401(k), including preexisting matching contributions on elective deferrals, constitute the lower of (1) 3% of each employee’s salary or (2) a percentage of each employee’s salary equal to the greatest contribution-to-salary ratio among all key employees.37
Safe harbor exemptions. 401(k) plans are typically exempt from ADP testing if either of the following conditions are met along with appropriate notice requirements: (1) the employer contributes 3% of each employee’s salary into their 401(k) regardless of the extent to which the employee contributes elective deferrals, or (2) all of the following: (a) the employer matches at least (a) 100% of an employee’s elective deferrals up to the first 3% of their salary and at least 50% of such deferrals up to the next 2% of their salary, (b) the matching rate for HCEs cannot be higher than for NHCEs at any rate of elective deferral with respect to salary, and (c) the matching percentages cannot decrease with the deferral rate.38 Additionally, 401(k) plans are exempt from ACP testing if further notice requirements are met, along with all of the following: (1) the plan satisfies conditions for exemption from ADP testing, (2) matching contributions are not made for elective deferrals past 6% of an employee’s salary, and (3) no after-tax contributions are made by the employee.39 Regardless of whether or not a 401(k) plan satisfies the above requirements from exemption from ACP testing, it must meet the ACP test applied to after-tax contributions,40 either with or without matching contributions.41 Finally, 401(k) plans are exempt from top-heavy testing if they are fully exempt from all ADP and ACP testing,42 meaning that if after-tax contributions are made, then top-heavy testing must occur.
Case law relevant to the (M)BRS is reviewed.
Facts of Summa. In 2015, the Tax Court ruled in Summa Holdings et al. v. Commissioner (Summa I) that certain shareholders of Summa Holdings, Inc. (Summa) were liable for excise taxes owing to excess contributions to Roth IRAs.43 The Benenson family owned Summa, a Delaware C corporation which itself owned several manufacturing subsidiaries. In 2001, James III and Clement of the Benenson family each opened a Roth IRA and made regular contributions of $3,500. In 2002, JC Export, a separate Delaware corporation controlled by the Benenson family, filed an election to be treated as a DISC (domestic international sales corporation).44 Subsequently, each IRA was used to purchase 1,500 shares of JC Export, and the shares were immediately transferred to JC Export Holding, Inc. (JC Holding).45 Also in 2002, subsidiaries of Summa entered into agreements with JC Export pursuant to which the subsidiaries made payments totaling approximately $2.2 million in four installments over the course of 2008. Immediately following each payment, JC Export transferred the entire amount of the payment to JC Holding. JC Holding then transferred as the entire amount of the payment to the two IRAs with the exception of withholdings for the unrelated business income tax of approximately 33%. These dividends could then be invested within the Roth IRA without incurring taxes on future growth.
Argument of the Commissioner. The substance-over-form doctrine is a well-established common law principle which allows for recharacterization of transactions to more accurately represent economic reality when the form of a transaction is contrary to the intent of the statutory provisions which allow for tax benefits to be claimed in association.46 The Commissioner claimed that the substance-over-form doctrine allowed for recharacterizations of the payments from subsidiaries of Summa to JC Export as “dividends to Summa’s shareholders followed by contributions …into the Benenson Roth IRAs,” and determined an “excise tax deficiency” for James III and Clement because “the contriutions to the Roth IRAs [exceeded] the annual contribution limits for Roth IRAs,” as well as income tax against Summa Holdings by “disallowing the DISC commission deductions that Summa claimed for the payments it made [to JC Export].”47 In Summa I, the Commissioner argued to the Tax Court that “[the Benenson family] had no nontax business purpose for establishing the Benenson Roth IRAs, JC Export, and JC Holding, and petitioners did not [receive] any nontax economic benefits from the [recharacterized] transaction.”48 The Commissioner later clarified further to the Sixth Circuit that “the ‘critical point’ of his argument is that the tax benefits Summa Holdings has enjoyed were ‘unintended both by the Roth IRA and DISC provisions.’ ”49 The Court ruled in favor of the Commissioner.
Relevance to (M)BRS. The application of the substance-over-form doctrine in Summa I and II clearly indicate the legal argument through which the IRS would seek to recharacterize an execution of the (M)BRS as a direct contribution to a Roth IRA—namely, by claiming that there are no nontax business purposes for execution of the (M)BRS, and that the (M)BRS yields tax benefits contrary to Congressional intent. Although popular tax guidance typically refers to the step transaction doctrine as the basis of enforcement action against the (M)BRS,50 the step transaction doctrine is more accurately understood as a constituent part of the overall substance-over-form doctrine,51 meaning that it suffices to consider the latter.
Appellate rulings. All taxpayers in Summa I appealed, resulting in rulings against the Commissioner in all of the Sixth Circuit (Summa Holdings v. Commissioner (2018); Summa II),52 the First Circuit (Benenson v. Commissioner; Benenson I),53 and the Second Circuit (Benenson v. Commissioner; Benenson II).54 These rulings, although not binding on the Tax Court outside of their respective Circuit, provide a legal basis strongly supporting the legitimacy of the (M)BRS. In particular, the Court ruled Benenson I that the substance-over-form doctrine is a “tool of statutory interpretation,” and since the transactions of the Benenson family do not “violate the plain intent of the relevant statues,” the doctrine cannot be used to justify recharacterization.55 That is to say, the economic substance of the statues authorizing the usage of DISCs and Roth IRAs in the manner of the Benenson family is tax avoidance, and so the substance-over-form doctrine cannot be used to claim that the tax-avoidant actions of the Benenson family have a conflict between their form and economic substance. Additionally, in Summa II, the Commissioner claimed that the substance-over-form doctrine empowered him with the broad power to recharacterize lower-tax paths to an end as an otherwise equivalent higher-tax paths to the same end, irrespective of the economic substance of the lower-tax path or its relation to the Code, because the higher-tax path may simply be asserted by the Commissioner as the “real” version of the transaction.56 The Court thoroughly rejected this argument, first on the basis that “only a parody of a purpose-based approach to interpretation, unanchored to statutory text, could justify a one-way use of this power,”57 and second because even if one accepts an argument that the overarching purpose of the Code is to maximize revenue, thereby empowering the Commissioner to perform such one-way uses, it is nevertheless the case that “[t]he Commissioner cannot place ad hoc limits on [entitites for which the purpose is tax avoidance] by invoking a statutory purpose (maximizing revenue) that has little relevance to the text-driven function of these portions of the Code (minimizing revenue).”58 Even if the overall combination of benefits was unanticipated by Congress, the substance-over-form doctrine does not “give the Commissioner a warrant to search through the Internal Revenue Code and correct whatever oversight Congress happens to make.”59 To whatever extent arguments in these decisions of the Courts are usable before the Tax Court, the (M)BRS, being a composition of Congressionally enacted tax avoidance steps entirely undertaken within Congressionally-created tax avoidance vehicles, and not involving any distortions of economic substance, is therefore fully legitimate.
Past recharacterizations. Existing case law upholds the ability of the IRS to recharacterize contributions to Roth IRAs in some circumstances. For example, when sham corporations are established within Roth IRAs and paid fees for nonexistent services, they may be recharacterized as direct contributions.60 Similarly, when ownership of a foreign sales corporation (FSC) is purchased within a Roth IRA, the income received from the FSC within the IRA may also be recharacterized as direct contributions.61 In Mazzei v. Commissioner, an appeal would be heard by the Ninth Circuit, so the earlier decision of Summa II was not binding and the Tax Court had the option of recapitulating the same argument. Even if Summa II were binding, the taxpayer before Sixth Circuit was Summa Holdings and “consequently the issue before that court was limited to whether the commissions paid to the DISC were deductible,” meaning that “the issue of whether the payments to the Roth IRAs were contributions” was not formally ruled upon by the Sixth Circuit.62 Nevertheless, the Court also concluded that Summa II “pertained to a related but different issue” and chose not to recapitulate the same arguments.63 Notably, the Tax Court itself “acknowledge[s] that the substance-over-form doctrine is not something the Commissioner can use to pound every Roth IRA transaction he doesn’t like,” elaborating in Block Developers et al. v. Commissioner upon the reversal of its decision in Summa I by the Sixth Circuit being based upon the “congressionally sanctioned intent” of a DISC being tax avoidance, in contrast to the present case involving LLCs, which are meant to have a “real business purpose.”64 As such, even in Circuits where the decisions of Summa II, Benenson I, and Benenson II are not binding upon the Tax Court, the limitations they describe on the substance-over-form doctrine may nevertheless be recognized to at least some extent by the Tax Court.
Overall argument. The argument for the legitimacy of the (M)BRS is as follows: Roth IRAs and conversions into them are “designed [by Congress] for tax-reduction purposes,”65 which the Commissioner must respect for the purposes of applying the substance-over-form doctrine because the doctrine is a “tool of statutory interpretation.”66 Similarly with DISCs, which are “all form and no substance,”67 it would be inappropriate to say that usage of the (M)BRS for tax avoidance is somehow unreflective of economic substance when the substance of the tax instruments and conversions which it utilizes is, as determined by statute and Congressional intent, purely tax avoidance. Consequently, it cannot be argued that execution of the (M)BRS is tantamount to “a labeling-game sham or [a defiance] of economic reality,” either of which would be a basis for recharacterization.68 This is in contrast to cases such as Mazzei and Repetto which do involve distortions of economic reality, and which the Tax Court has repeatedly recognized as distinct from the issues raised in Summa I on account of the constructions used therein (LLCs, FSCs, etc.) as statutorily possessing economic substance aside from tax avoidance.69 The only remaining basis under which the Commissioner could repudiate the (M)BRS is by claiming that the substance-over-form doctrine empowers them to recharacterize lower-tax paths as otherwise equivalent higher-tax paths to the same end regardless of the economic substance of the lower-tax path or its place in the Code. However, the Sixth Circuit rejected this claim in Summa II, writing that “this broad recharacterization power travels along a one-way street” and could only be justified by “pitch[ing] the Internal Revenue Code’s purpose at an Emperor’s level of generality—that the ‘overarching’ purpose of the Code …is to increase revenue.”70 Even if this interpretation were “endorse[d] in its full flowering form,” it would remain the case that the Commissioner cannot apply it to Summa II because “[t]he point of [DISCs and Roth IRAs] is tax avoidance,” and so the Commissioner cannot limit them on the basis that he is supposedly empowered by statute to maximize revenue when the “text-driven function of these portions of the Code [which authorize DISCs and Roth IRAs]” is to minimize revenue.71 This is also true of the (M)BRS and so the same recharacterization power is equally inapplicable to the (M)BRS.
Conclusion. Current case law in the First, Second, and Sixth Circuits, as well as in the Tax Court’s own rulings and interpretations of the Circuit Courts’ rulings, suggest that the (M)BRS is fully legitimate.
Citations to the Sixth Circuit decision in Summa Holdings v. Commissioner are frequently used as the basis of claims that the (M)BRS is legitimate because it has been explicitly ruled as such by a federal court of appeals.72 Many such assertions rely exclusively upon citations to the following text in the ruling of the Court of Appeals of the Sixth Circuit:
The Commissioner persists that Congress intended Roth IRAs to be used only by median-income and low-income taxpayers, as evidenced by the contribution and income limits. We have our doubts. When pressed, the Commissioner knew of no empirical data to support the point. At any rate, Congress’s decision in 2005 to allow owners of traditional IRAs, who can make contributions regardless of income, to roll them over into Roth IRAs no matter how many assets the accounts hold or how high the owners’ incomes, see 26 U.S.C. §408A(d)(3), undercuts this contention. Those rollovers permit high-income taxpayers to avoid the income limits on Roth IRA contributions, just as the DISC permitted Summa Holdings to avoid the contribution limits. The Commissioner cannot fault taxpayers for making the most of the tax-minimizing opportunities Congress created.73
The interpretation of this paragraph as, e.g., “confirming”74 the legitimacy of the BRS is implicitly based on a reading of “avoid the income limits on Roth IRA contributions” as referring, at least in part, to the limitation of regular (i.e., direct) contributions to Roth IRAs (currently $6,000 for 2019).75 Leaving aside the observation that this decision is not binding on the Tax Court outside of the Sixth Circuit, there exists a more natural interpretation of the quoted paragraph which does not endorse the legitimacy of the BRS. It is an interpretation wherein “contributions” is read as referring solely to qualified rollover contributions. This interpretation is more natural because the quoted text refers directly to “Congress’s decision in 2015” to permit rollovers into Roth IRAs without income limitations, specifically §512(a)(1) of the Tax Increase Prevention and Reconciliation Act of 2005—with section heading “Conversions to Roth IRAs” and subsection heading “Repeal of income limitations”—which struck out a subparagraph imposing an adjusted gross income-based limitation on a taxpayer’s ability to make a “qualified rollover contribution to a Roth IRA”.76 Such contributions are substantively different from direct contributions at least insofar as they are subject to different qualifying requirements for withdrawal without triggering a penalty tax,77 and consequently the two interpretations discussed herein cannot be understood as being synonymous. Accordingly, the proposed interpretation of “contributions” as referring specifically to qualified rollover contributions is both more natural than and clearly distinct from interpretations of “contributions” which include regular contributions, leaving opening the possibility that the quoted text is merely a narrow restatement of already-explicit Congressional intent rather than a broader endorsement of the BRS.
Many popular news articles and blogs reported in 2018 that Congress had explicitly approved the BRS.78 However, this claim is entirely unwarranted.
The basis for this claim was the presence of text in footnotes of a Congressional conference committee on the Tax Cuts and Jobs Act of 2017. In a discussion of present law concerning retirement savings accounts, the report mentions that individuals “can” perform a sequence of tax maneuvers resembling the (M)BRS BRS.79 The existence of these Congressional comments should not factor into decisions regarding the legitimacy of the (M)BRS for several reasons:
As such, arguments reliant upon these Congressional comments should be dismissed.
Past action is typically a useful predictor of future action, both in regard to whether or not the anti-(M)BRS audit policies are actively enforced by IRS agents and in regard to the possibility of retroactive enforcement action should the IRS decide that the (M)BRS are illegitimate tax maneuvers.
One credible secondhand report of IRS enforcement action against the (M)BRS exists, in which IRS agents performing an audit for non-(M)BRS reasons required reversal of BRS conversions.82 In contrast, there are a number of anecdotal reports of the (M)BRS surviving IRS scrutiny.83 There are no known reports of IRS agents actively pursuing individuals executing the (M)BRS. Similarly, no court cases exist where the IRS has taken an explicitly anti-(M)BRS position.
In a recent case when the Tax Court ruled that a previously commonly held interpretation of IRS rules was incorrect, the IRS left a 1-year grace period in between release of the ruling and enforcement of the new interpretation and did not perform any retroactive enforcement.84
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