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@NCperson wrote:

you are physically doing the work in CO and residing in CO.  [y]ou owe tax to states where a) you work and b) you reside, but in this case, both are CO. 


Even if @audballer were "physically doing the work in Texas" (e.g., travelling to a Texas work location), Colorado could still levy an income tax on @audballer's income as a Colorado resident.