Updated July 28, 2026. Quick answer: Residency at the time of the conversion generally determines which state taxes it. Moving from a taxing state to a no-tax state and converting after establishing residency can eliminate the state bill entirely — the same conversion, weeks apart.
The timing question
A conversion is ordinary income in the year it happens, and the state that gets to tax it is generally the one you are resident in at that moment. So a planned move creates a genuine timing decision that most people never realise they have.
| Moving from → to | Convert |
|---|---|
| Taxing state → no-tax state | After the move |
| No-tax state → taxing state | Before the move |
| Both tax it similarly | Timing is not the lever — bracket is |
Residency is a question of fact, not of a mailing address. States that lose high-income residents examine this closely, and a conversion executed days after a move, with the old home unsold, is exactly the pattern that attracts a residency audit. Establish residency properly first.
Which state, specifically
The answer is not uniform: some states exempt conversion income, some tax it fully, and several have exclusions whose application to a conversion rather than a distribution is genuinely unclear. See the state-by-state treatment — 24 of 51 land where the common shortcut may be wrong.
Sources
IRC §408A (Roth IRAs); IRC §408A(d)(3) (conversions); IRC §1411 (net investment income tax); IRC §86 (taxation of Social Security benefits); IRC §6654 (estimated tax); Tax Cuts and Jobs Act (2017) §13611 (repeal of conversion recharacterisation). Cross-checked July 2026 against professional analyses. Indexed thresholds are described rather than asserted, because they change annually.
This states what the cited authority says. It is not tax advice, and a conversion interacts with the rest of your return in ways one page cannot see.