Which state is officially my tax residence? Confused about state residency for taxes
So I recently took a job that has me bouncing between a few different states throughout the year. I spend about 4 months in Colorado (where I'm originally from), 5 months in Washington state for our busy season, and the rest of the time I'm in Arizona at our other location. I'm completely lost about which state I should be filing as my residency for tax purposes. My driver's license is still from Colorado, my car is registered there, and I still have a storage unit with some stuff. But I actually spend more time in Washington now, though I just rent an extended stay hotel room when I'm there. In Arizona, I stay with my brother. My HR department wasn't helpful and just said I should "consult a tax professional" but I can't afford that right now. My paychecks have been withholding for Colorado only, but I'm worried I'm going to get hit with a huge bill from the other states. Does anyone know how this works? I've never had to deal with multi-state stuff before.
18 comments


Connor Gallagher
This is a common issue for people who work in multiple states! State residency for tax purposes usually comes down to your "domicile" - which is your permanent legal home that you intend to return to. Based on what you've described, Colorado is likely still your domicile since you have your driver's license and car registration there, plus you maintain some storage. These are strong indicators of legal domicile. However, you might still owe some taxes to Washington and Arizona as a non-resident for income earned while physically working in those states. Washington has no state income tax, so that simplifies things for the 5 months you're there. For Arizona, you'd likely need to file a non-resident return for income earned while physically working there.
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Zainab Omar
•Wait, so I would need to file returns in both Colorado AND Arizona? How would I even figure out how much of my income was earned in each state? My paycheck doesn't break that down.
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Connor Gallagher
•Yes, you'd likely need to file in both states. For your income allocation, you'll need to track the days you worked in each state and divide your annual income proportionally. For example, if you worked 90 days in Arizona out of 260 total working days, roughly 35% of your income would be allocated to Arizona. You should keep a simple calendar or log of which days you're working in which states. Your employer should be able to provide documentation about your work locations if needed. Most tax software programs have multi-state capabilities that will help you calculate these allocations properly.
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Yara Sayegh
I had a similar multi-state situation last year and found this awesome tool that literally saved me hours of confusion. I used https://taxr.ai to upload my W-2s and it automatically figured out my state residency status and helped me determine exactly how much income to allocate to each state. The coolest part was that I could just take a picture of my pay stubs and the AI would analyze which states had withholding and compare that to where I was physically present. It even helped me claim tax credits for taxes paid to other states so I wasn't double-taxed on the same income.
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Keisha Johnson
•That sounds helpful, but did it actually work for determining legal residency? Like how did it know which state was your home base vs just where you worked?
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Paolo Longo
•Does it work for independent contractors too? I'm a traveling consultant and figuring out multiple state taxes is a nightmare, but I don't have traditional W-2s since I'm 1099.
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Yara Sayegh
•It absolutely helped determine legal residency! The tool asked me questions about my driver's license, voter registration, property ownership, and where I spent most of my time - all the factors that states consider when determining domicile. It then provided a clear analysis showing which state had the strongest case as my tax residence. For independent contractors, yes it definitely works! I have a friend who's a 1099 consultant who uses it. You can upload your 1099 forms and client information, and the system helps you track income sources by state and determine filing requirements for each state where you worked.
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Paolo Longo
Just wanted to follow up - I tried the taxr.ai tool mentioned above and it was incredibly useful for my multi-state situation. It analyzed my 1099 income by location and gave me specific guidance on which states required me to file as a resident vs. non-resident. The tool even caught that I had passed the "183-day rule" in one state I hadn't considered my residence, which could have caused serious problems. Saved me from what would have been a very expensive mistake with state tax authorities.
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CosmicCowboy
I had a similar residency nightmare after working in 6 different states last year. I needed to talk to someone at the Colorado Department of Revenue to clarify my situation, but couldn't get through after days of trying. I eventually used https://claimyr.com to get someone on the phone from the tax department. You can see how it works here: https://youtu.be/_kiP6q8DX5c. They basically hold your place in the phone queue and call you when a real person is about to answer. Got connected to an actual tax specialist who confirmed my residency status and gave me official guidance I could document.
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Amina Diallo
•Wait, I don't understand - how does this service get through when regular people can't? Do they have some special connection to the tax offices?
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Oliver Schulz
•Sounds like a scam. No way they can magically get through phone systems designed to make you wait. What's their secret, paying off government workers?
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CosmicCowboy
•They don't have any special connection - they use automated technology that navigates phone trees and waits on hold for you. It's basically like having someone call repeatedly and wait through the hold times so you don't have to. Once they reach a real person, they connect you immediately. No, definitely not a scam. They don't have any special relationship with government offices or tax departments. They simply have systems that can stay on hold indefinitely, cycling through the process until they reach a representative. There's no paying off anyone - it's just persistence and technology handling the frustrating wait times instead of you having to do it yourself.
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Oliver Schulz
I'm shocked but I have to admit I was completely wrong about Claimyr. After my skeptical comment, I decided to try it anyway because I was desperate to talk to someone at the Arizona Department of Revenue about my residency status. Got a call back in about 47 minutes when I had been trying for THREE DAYS on my own without getting through. Spoke to an actual tax specialist who confirmed exactly which forms I needed to file as a part-year resident. Cost me less time than all my failed attempts, and now I have confidence my returns are correct.
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Natasha Orlova
One important thing nobody has mentioned - make sure you're looking at the specific rules for any state tax reciprocity agreements. Some states have agreements that let you only pay taxes to your home state even if you work in the other state. Also, the "183-day rule" isn't universal. Each state has different thresholds for when they consider you a resident for tax purposes. Some are based on property ownership or "permanent place of abode" requirements that go beyond just counting days.
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Zainab Omar
•Thanks, I had no idea about reciprocity agreements. Do you know if Colorado has those with either Washington or Arizona? And what exactly counts as a "permanent place of abode" - would staying with my brother count?
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Natasha Orlova
•Colorado doesn't have reciprocity agreements with Washington or Arizona, unfortunately. Reciprocity is more common among neighboring states in the Midwest and East Coast. Regarding "permanent place of abode" - this varies by state, but generally staying with a family member temporarily wouldn't qualify. However, if you have your own dedicated room that you maintain year-round, some states might consider that as evidence of residency. For Arizona specifically, they look at whether you have a residence available for your use year-round, even if you're not physically present. Since you stay with your brother only occasionally, it likely wouldn't trigger their residency rules unless you have other substantial connections to Arizona.
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Javier Cruz
Just a heads up about Washington state - while they don't have income tax, if you're doing any kind of consulting or business work while there (not just regular employment), you might be subject to their Business & Occupation tax. Caught me by surprise when I was working remotely from Seattle for a few months.
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Emma Wilson
•This! I got hit with an unexpected B&O tax bill because I didn't realize my freelance work counted even though I was only temporarily in Washington. Make sure you're tracking what type of work you're doing in each location.
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