I work remotely from home in IL and sometimes while on visits in CO for CA company. Do I need to file state tax returns for IL and CO?

[TomD8 · Accepted solution]

You must file in both states.  Your home state of IL can tax all your income, regardless of where you earned it.  CO taxes non-residents on any CO-source income.  Income earned by work actually performed in CO is CO-source income.

You'll be able to take a credit on your IL return for taxes paid to CO, so you won't be double-taxed.

In TurboTax, you should complete your non-resident CO return before you do your home state IL return, so that the credit flows properly.