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I am moving from WA to CO. I'm trying to figure out at what point I become a CO resident and therefore liable for state income tax.

All states have websites with URLs of the form, where XX is the two-letter postal code for the state. For example, Colorado's website is:

Once you get to the state's website, then look for their tax collecting agency. For the states in which I've lived, that agency has always been called the "Department of Revenue."

Once you get to the tax collecting agency, then look for information about "part year residents."

Based on my experience, I would expect that you will become a resident when you get a Colorado drivers licence, title and register your cars in Colorado, buy residential real estate in Colorado, and register to vote in Colorado. I would expect that you are required to get the drivers license and register and title your cars within 30 days of arriving in the state. There probably is some wiggle room, and a tax expert in Colorado can help you to figure out where the legal, ethical, and moral boundaries lie.

Another question: I will be receiving a significant amount of income ($50k) on around May 17th. Any legal and ethnical way I can have this as WA source income and therefore not subject to CO state tax?

This question is trickier. Somebody may be able to answer it. However I would ask a tax expert in Colorado.

David Jacobs
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