Direct Roth IRA contributions phase out at income levels that most senior executives and airline captains cross well before their peak earning years. The account itself does not become unavailable at that point. Only the direct contribution does.
That distinction is the entire basis of what is commonly called a backdoor Roth IRA. It is not a product, an account type, or a loophole in the ordinary sense. It is a sequence of two transactions the Internal Revenue Code permits separately, used together to reach an account that a direct contribution can no longer reach. The mechanics are simple enough to describe in two sentences. The complication sits almost entirely in one place: what else the taxpayer already holds in traditional IRAs.
At Avion Wealth, the question rarely arrives as a question about contribution limits. It arrives as a question about a rollover IRA that has been sitting untouched since a job change eight years ago, and whether that balance now changes the arithmetic. It usually does.
The Income Limits That Create the Question
Roth IRA contribution eligibility phases out based on modified adjusted gross income. For 2026, the phase-out range is $242,000 to $252,000 for married couples filing jointly, and $153,000 to $168,000 for single filers and heads of household. For a married individual filing separately, the range is $0 to $10,000 and is not indexed for inflation. (Source: IRS Notice 2025-67, as of January 1, 2026.)
Above the top of the applicable range, the direct Roth contribution is not reduced. It is eliminated. For high-earning households, where that range falls relative to other 2026 planning thresholds may affect how the year is sequenced.
The deduction for a traditional IRA contribution phases out separately, and at lower income levels, for anyone covered by a workplace retirement plan. For 2026, that range is $129,000 to $149,000 for a married couple filing jointly where the contributing spouse is an active participant, and $81,000 to $91,000 for single filers and heads of household who are active participants. Where one spouse is not an active participant but the other is, the range is $242,000 to $252,000. (Source: IRS Notice 2025-67, as of January 1, 2026.)
For a household above both sets of thresholds, the result is a narrow but useful fact: the traditional IRA contribution is still permitted, it simply is not deductible. There is no income ceiling on making a nondeductible traditional IRA contribution.
What a Backdoor Roth IRA Actually Is
A backdoor Roth IRA is a nondeductible contribution to a traditional IRA followed by a conversion of that amount to a Roth IRA.
The reason the sequence functions is that the income limit that applies to Roth contributions does not apply to Roth conversions. Conversions have carried no income restriction since 2010. A taxpayer whose income closes the front door retains access to the conversion door, and a nondeductible traditional IRA contribution is what places money on the other side of it.
The maximum amount involved is modest. For 2026, the IRA contribution limit is $7,500, with an additional catch-up amount of $1,100 for those who have attained age 50 before the close of the taxable year. (Source: IRS Notice 2025-67, as of January 1, 2026.) For a married couple where both spouses are eligible to contribute, the combined figure roughly doubles, since IRA eligibility is determined per individual rather than per household. Spousal IRA rules may allow a contribution for a non-earning spouse where the couple files jointly and has sufficient earned income.
These are not amounts that reshape a balance sheet in a single year. Their value tends to be cumulative and structural: Roth assets are not subject to required minimum distributions during the original owner’s lifetime, and they create a category of dollars whose future tax treatment is already settled. For an executive who expects concentrated income events, or a captain approaching a defined retirement date with pension elections and rollover decisions ahead, having a tax-diversified set of buckets may matter more than the size of any one contribution.
The Two Steps, In Sequence
Step One: A Nondeductible Contribution to a Traditional IRA
The contribution is made to a traditional IRA and reported as nondeductible. Nothing about the contribution is unusual. What matters is that the nondeductible character is documented, because that documentation is what prevents the same dollars from being taxed twice later.
The contribution establishes what the Code calls basis: after-tax money inside a pre-tax account. Basis is tracked on Form 8606 and carried forward indefinitely.
Step Two: A Conversion of That Contribution to a Roth IRA
The amount is then converted to a Roth IRA. If the traditional IRA held nothing but the nondeductible contribution, and the contribution generated little or no earnings before conversion, the taxable portion of the conversion is close to zero. Any earnings that accrued between contribution and conversion are taxable as ordinary income in the year of conversion.
There is no statutory waiting period between the two steps. Some practitioners prefer a short interval; others do not. The relevant point for compliance purposes is that the tax result is driven by the pro-rata calculation described below, not by the number of days between the two transactions.
The Pro-Rata Rule Is Where This Breaks Down
How the Calculation Works
Under IRC Section 408(d)(2), all of a taxpayer’s traditional, SEP, and SIMPLE IRAs are treated as a single account for purposes of determining how much of a distribution or conversion is a nontaxable return of basis. The taxpayer does not get to designate which dollars were converted.
The nontaxable fraction is total after-tax basis divided by the combined value of all traditional, SEP, and SIMPLE IRAs as of December 31 of the conversion year, plus any distributions taken during the year and any outstanding rollovers. (Source: Instructions for Form 8606, IRS, line 6.)
Two features of that formula deserve attention. First, the measurement date is the end of the year, not the date of the conversion. A rollover that arrives in an IRA in November affects a conversion that occurred in March. Second, the aggregation is across accounts, so opening a separate, brand new traditional IRA for the contribution does not isolate it.
Why a Single Rollover IRA Changes the Outcome
Consider a taxpayer who makes a $7,500 nondeductible contribution in 2026 and converts it, and who also holds a rollover IRA valued at $292,500 on December 31, 2026. Total traditional IRA value is $300,000, of which $7,500 is basis. The nontaxable fraction is $7,500 divided by $300,000, or 2.5 percent.
Of the $7,500 converted, roughly $188 is treated as a nontaxable return of basis. The remaining $7,312 is taxable as ordinary income. The basis that was not used remains in the traditional IRA and continues to be tracked, so it is not lost, but it also is not accessible on demand.
For a taxpayer in a high marginal bracket, that outcome is materially different from the one the strategy is usually described as producing. Nothing was done incorrectly. The rollover IRA simply sat in the denominator.
What the Calculation Does Not Include
The aggregation rule is narrower than it may appear, and the exclusions are where planning room often exists. The third and fourth points are frequently misunderstood. The second point is the one that creates a possible path forward.
- Roth IRA balances are excluded entirely
- Balances held inside an employer retirement plan, including a 401(k), 403(b), or governmental 457(b), are not part of the calculation
- Inherited IRAs held as a beneficiary are treated separately and are generally not aggregated with the taxpayer’s own IRAs
- A spouse’s IRAs are not aggregated with the taxpayer’s own, since the calculation is performed per individual even on a joint return
Paths Around a Rollover IRA Balance
Because employer plan balances sit outside the pro-rata calculation, moving pre-tax IRA money into an employer plan may change the denominator. This is sometimes called a reverse rollover.
Whether it is available depends on the plan document. A plan is permitted to accept rollovers from IRAs but is not required to, and many restrict what they will take. Plans that do accept them will generally accept only the pre-tax portion, since after-tax IRA basis cannot ordinarily be moved into a qualified plan. Confirming both points with the plan administrator before initiating anything is the practical first step, and the December 31 measurement date means the sequencing within the calendar year matters.
A reverse rollover also involves trade-offs that deserve fair treatment alongside the benefit. Moving assets from an IRA into an employer plan generally narrows the investment menu to the plan’s lineup, changes the applicable creditor protection framework, and may affect the availability of qualified charitable distributions later, since those are made from IRAs rather than from plans. It may also change distribution flexibility, since plan withdrawal rules are set by the plan rather than by the account owner. Whether the pro-rata benefit outweighs those considerations depends on the situation and deserves review alongside existing legal and tax professionals.
Form 8606 and the Reporting Trail
Form 8606 is filed for any year in which a nondeductible traditional IRA contribution is made, a conversion occurs, or a distribution is taken while basis exists. Part I computes the nontaxable portion under the pro-rata rule. Part II reports the conversion and its taxable amount. (Source: Instructions for Form 8606, IRS.)
The form is cumulative, which is what makes it consequential. Basis reported in one year carries forward on line 14 and becomes the starting point in the next. A year that is skipped or filed incorrectly may cause after-tax dollars to be taxed a second time on withdrawal, sometimes many years later and long after the supporting records have been discarded. Retaining copies indefinitely, rather than for the ordinary record retention period, is the conventional practice.
Where the tax return is prepared by a CPA who did not handle the IRA transactions, the conversion is worth surfacing explicitly. A Form 1099-R showing a distribution from a traditional IRA looks identical whether or not basis was involved, and the basis information does not come from the custodian.
The Five-Year Rules Are Two Different Rules
Roth accounts carry two separate five-year measurements, and conflating them is common.
One determines whether a distribution is a qualified distribution, which generally requires that five taxable years have passed since the first contribution to any Roth IRA and that another condition, such as attaining age 59 and a half, is satisfied. The other applies to converted amounts and relates to whether the 10 percent additional tax may apply to a withdrawal of those amounts before age 59 and a half. Each conversion carries its own clock.
For a taxpayer well under 59 and a half who may need access to the converted principal in the near term, the second rule is the one that bears on the decision. For a taxpayer past 59 and a half with a Roth IRA established years earlier, neither is typically the constraint. The distinction deserves review against the specific facts rather than applied from a general rule.
Conversions Cannot Be Undone
A Roth conversion is not reversible. The recharacterization option that once allowed a conversion to be unwound is no longer available for conversions, although recharacterization of a contribution between a traditional IRA and a Roth IRA remains available in certain circumstances.
The practical consequence is that the taxable amount is determined by facts that may not be fully known in the spring, particularly the December 31 balance in the denominator. Where a rollover from a departing employer’s plan is expected later in the year, or where a SEP or SIMPLE IRA is in the picture, the order of operations may be worth mapping before the first step rather than after.
Where the Backdoor Roth Sits in a Larger Plan
For the clients this question most often comes from, the contribution is rarely the interesting part.
For a senior executive, the conversion decision interacts with the timing of equity compensation. A year with a large vesting event, an option exercise, or a concentrated stock sale is a year in which additional ordinary income from a partially taxable conversion lands in a higher bracket. A year between such events may look different.
For an airline captain approaching a mandatory retirement date, the sequence sits inside a larger set of decisions: pension election, whether a lump sum is rolled to an IRA or left in the plan, and how retirement income is drawn in the years before Social Security and Medicare begin. A rollover that solves one problem may create the pro-rata problem described above, and the ordering of those steps across two or three tax years may matter more than any single one of them.
For a family wealth steward, Roth assets carry a different beneficiary profile than pre-tax assets, since the distribution rules that apply to inherited accounts interact with income tax treatment differently depending on the account type. That interaction is worth coordinating alongside estate documents rather than treating as an investment question.
None of these considerations changes the mechanics. They change whether, and when, the mechanics are worth executing.
For high earners weighing whether a backdoor Roth IRA fits alongside existing accounts, plan balances, and expected income events, Avion Wealth offers a complimentary Second Opinion Service focused on how the sequence may interact with the rest of a wealth plan, coordinated alongside existing legal and tax professionals.
To your success,
The Avion Wealth Team
Frequently Asked Questions
Is a backdoor Roth IRA legal?
The two transactions involved are each expressly permitted by the Internal Revenue Code: a nondeductible traditional IRA contribution, which has no income ceiling, and a Roth conversion, which has carried no income limit since 2010. The IRS requires the sequence to be reported on Form 8606, and the taxable portion is determined by the pro-rata rule under Section 408(d)(2). Whether the sequence produces the intended result in a given year depends on the taxpayer’s other IRA balances.
How much can go into a backdoor Roth IRA for 2026?
The IRA contribution limit for 2026 is $7,500, plus a catch-up amount of $1,100 for those who have attained age 50 before the close of the taxable year, as of January 1, 2026. Because eligibility is determined per individual, a married couple filing jointly where both spouses are eligible may contribute up to those limits each. The limit applies across all IRAs owned by an individual, not per account.
Is there a required waiting period between the contribution and the conversion?
There is no statutory waiting period. Practice varies, and some advisers prefer a short interval. The taxable amount of the conversion is driven by the pro-rata calculation and the December 31 aggregate value of traditional, SEP, and SIMPLE IRAs, not by the interval between the two steps.
What happens if a rollover IRA already exists?
The rollover IRA balance enters the denominator of the pro-rata calculation, which means most of the converted amount is generally treated as taxable ordinary income rather than as a return of after-tax basis. Employer plan balances are excluded from that calculation, so moving pre-tax IRA money into a current employer plan may change the result where the plan accepts such rollovers. Whether that trade is favorable depends on the plan’s investment menu, distribution rules, and other factors that deserve review.
Do a spouse’s IRA balances affect the calculation?
No. The pro-rata calculation under Section 408(d)(2) is performed per individual, even on a joint return. One spouse holding a large rollover IRA does not affect the other spouse’s conversion arithmetic.
Is Form 8606 required if the conversion produced no taxable income?
Yes. Form 8606 is filed for any year in which a nondeductible contribution is made or a conversion occurs, regardless of whether tax is due. The form is what establishes and carries forward the after-tax basis, and a gap in the filing history may cause those dollars to be taxed a second time on a later withdrawal.