Backdoor Roth IRA Timing: Is a Waiting Period Required?
Where the waiting-period myth came from
The concern traces back to the step-transaction doctrine, a general tax-law principle from the 1935 case Gregory v. Helvering that lets the IRS treat a series of formally separate steps as one combined transaction if they have no independent substance of their own. Applied to a backdoor Roth, the theoretical worry was: if a nondeductible contribution and its conversion happen on the same day, could the IRS collapse the two steps and treat it as an illegal direct Roth contribution instead? Some advisors, out of caution, began recommending a delay to make the two steps look more clearly separate.
The IRS’s own answer: no waiting period needed
That caution turned out to be unnecessary. The IRS clarified in early 2018 that no waiting period is required between the contribution and conversion steps of a backdoor Roth. On top of that, the conference report accompanying the 2017 Tax Cuts and Jobs Act contains footnotes explicitly acknowledging that a taxpayer who can’t contribute directly to a Roth IRA due to income can still contribute to a Traditional IRA and convert it – while separately closing off the ability to undo (recharacterize) that conversion afterward. Congress saw the exact strategy being described here and chose to leave it in place rather than shut it down.
The minority view that still recommends waiting
Some practitioners remain more conservative anyway. A subset of advisors suggest waiting a full statement cycle – or, in a few cases, cite Revenue Procedure 2008-24’s roughly one-year standard from an unrelated IRA-recharacterization context as a rough analogy for extra insulation. This is a risk-preference choice, not a legal requirement; the prevailing, IRS-confirmed practice is that converting promptly is fine.
| View | Recommendation | Basis |
|---|---|---|
| IRS position (2018 clarification) | No waiting period required | Direct IRS guidance; TCJA conference report footnotes |
| Mainstream practitioner practice | Convert promptly | Aligned with IRS clarification |
| Cautious minority | Wait one statement cycle or longer | Extra insulation against a hypothetical future challenge; not a cited legal requirement |
One real practical reason to wait a few days anyway
Even with no legal waiting period, it’s worth letting your Traditional IRA contribution actually settle and clear before initiating the conversion – purely to avoid an administrative mismatch with your custodian, not because of any tax rule.
Have existing pre-tax IRA balances? The timing question matters less than this one: The Backdoor Roth Pro-Rata Rule, Explained →
Frequently Asked Questions
Do I have to wait before converting a backdoor Roth?
No – there’s no statute or IRS rule setting a minimum holding period; waiting is a cautious practice, not a requirement.
What did the IRS actually say about waiting periods?
The IRS clarified in 2018 that no waiting period is required, and the 2017 TCJA conference report explicitly acknowledged the strategy in its footnotes.
What is the step-transaction doctrine, and does it apply here?
A doctrine letting the IRS collapse linked steps into one transaction; the concern it could apply to backdoor Roths is now widely considered settled.
Why do some advisors still recommend waiting anyway?
Out of caution rather than legal necessity – some suggest a statement cycle or longer as extra insulation, not because a rule requires it.
- The FI Tax Guy, “Backdoor Roth IRA Timing” – fitaxguy.com – the 2018 IRS clarification that no waiting period is required.
- Metz Lewis, “Tax Cuts and Jobs Act Report Confirms Validity of Back-Door Roth IRA Conversions” – metzlewis.com/blog – the 2017 conference report footnotes acknowledging the strategy.
- Kitces.com, “How To Do A Backdoor Roth IRA Contribution While Avoiding The IRA Aggregation Rule And The Step Transaction Doctrine” – kitces.com/blog – the step-transaction doctrine background and the more cautious minority practitioner view.
Fantastic video, as always! Just as an idea for a future video, it would be nice to get your take on the Vanguard "BETR" model for Roth conversions…
Well, the first year I did the back door Roth, waited to do the conversion and had a small amount of gain to report on our taxes. It was kinda of a headache to work through the forms on TurboTax. Decided from then on to do like Ethan and convert the same day, avoiding additional income to report. I see no benefit waiting to convert.
The downside is not $20 in tax, it's 1 month of lost growth. Still probably not life changing but I'm a fan of same day. No hesitation with timing, no missing out on growth days, no tax. I seem to recall a blessing of a step transaction in some IRS letter somewhere once as well.
good video. we typically make our non deductible contribution for the prior year at the same time we do our taxes in April. It therefore goes immediately on the tax return, however since a Roth conversion needs to be done by Dec 31st, the conversion goes on the following years tax return, thus we don't worry about any time elapsing.
I don't see the usefulness of "respecting" step B (tIRA)…?
Ours is done through Vanguard, which requires a few days to settle in tIRA before funds are allowed into Roth IRA. This wait is not my choosing; if I could, would just transfer immediately from A to B to C.
Merry Christmas Sean. Great stuff as always.