Does Your State Tax a Backdoor Roth Conversion the Same Way the IRS Does?
Why states can diverge from the federal treatment
States that levy income tax generally start from federal Adjusted Gross Income and then apply their own adjustments. Most states with an income tax follow the federal nondeductible-basis concept in spirit, but the mechanics of how that basis is tracked, and whether a state provides its own equivalent of Form 8606, vary by state and can change from year to year. A handful of states have no income tax at all, which removes the question entirely for residents there. This is exactly the kind of detail that’s easy to assume is “the same as federal” and isn’t always.
| Situation | Why it needs a state-specific check |
|---|---|
| Contributed and converted while living in the same state all year | Usually the simpler case, but still worth confirming your state recognizes the nondeductible basis the same way the IRS does |
| Contributed in one state, converted after moving to another | Each state may only tax the portion of income (or basis) attributable to residency there – a genuinely state-specific calculation |
| Living in a state with no income tax | The state-tax question doesn’t apply at all – only the federal Form 8606 tracking matters |
General state conformity concept per multi-state tax practitioner guidance; this guide does not cite specific state figures because they vary and change – confirm with a preparer licensed in your state.
Red flag to watch for
Any generic guide (including this one) that tells you exactly how your specific state taxes a backdoor Roth conversion without asking which state you live in is oversimplifying. This is one of the few genuinely state-dependent pieces of an otherwise uniform federal strategy.
Need the federal mechanics first? See our step-by-step Backdoor Roth guide → or the Pro-Rata Rule.
Frequently Asked Questions
Is a backdoor Roth conversion taxed the same at the state level as federally?
Often similarly, but not guaranteed identical – state conformity to federal nondeductible-basis rules varies and can matter most if you moved states between contributing and converting.
Do I need to file a state-level Form 8606 equivalent?
Depends on your state; some states have their own basis-tracking requirements, others rely entirely on the federal form. Check with a preparer licensed in your state.
Does this affect people in no-income-tax states?
No – if your state has no income tax, only the federal Form 8606 tracking applies to you.
- Internal Revenue Service, Instructions for Form 8606 – irs.gov/forms-pubs/about-form-8606 – federal nondeductible basis tracking.
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Wait, you don't HAVE to max out your normal 401(k) contributions first, right? That's just a recommendation?
The traditional IRA is still limit how much you can yearly per irs. Example it's $7k 20205
This is an incredibly detailed breakdown for high-income earners. The key complexity is definitely checking if the 401k allows for after-tax contributions AND in-service withdrawals. That's the biggest hurdle for most people trying to implement this. Great video!
Background music needs to be off please
hearing the way he pronounced IRA- fix it Jesus
Oh man, the intermixing of “Eyera” and I-R-A kills me. I tried to hang but I just couldn’t.
Are you paying tax twice in this strategy? 1) ‘after tax’ contribution, and 2) during conversion ?
I find it ridiculous that we have to do a back door Roth IRA because we don't qualify anymore.
I think ill have enough honestly but sounds good. Get greedy people lol
Who can do the conversation a financial advisor?
We definitely know what it is! Thanks for the info.
Correction: You don't have to be a high income earner and you can do both, Roth Ira and mega backdoor Roth.
Can you fund a regular Roth IRA AND do a Mega Backdoor ?
Is the back door Roth going away with this new Big Beautiful Bill?
well, it is all over! nomore mega backdoor or backldoor
It’s actually wild that the Mega Backdoor Roth is still flying under the radar in 2025. Like… we’re all out here paying unnecessary taxes because no one’s talking about this.
Appreciate you, sir
Thank you Karlton! How about SEP IRA and business owners? What do we do with the Roth products?
I have two 401(k) plans inside my retirement, one a traditional 401(k) the other is a Roth 401(k) the question I have is would it be smart to convert from my Roth 401(k) to my Roth IRA? I would like to contribute more to my IRA and I’m wondering if this would be the best option for me.
Is this only for 401(k) plans? Can I do a mega backdoor Roth with my 457(b) plan?