Solved
According to our CPA, his software correctly calculated the Colorado state income tax add-back by not including the amount from California Form 593. I've read the instructions for the CA Form 593, and it appears we should NOT be required to include the amount as either federal or Colorado income. I need to know how Turbotax software would handle the amount on Form 593, since I don't have a way to experiment and take myself to that point in the program.
This FAQ explains how TT handles CA Form 593 and how to enter the form: https://ttlc.intuit.com/questions/2757572-how-do-i-enter-ca-form-593-real-estate-withholding
CA Form 593 shows CA real estate tax withholding; it does not show income. https://www.ftb.ca.gov/forms/2018/18_593.pdf
You would not enter withheld CA tax on a CO return.
If you're a CO resident with a taxable capital gain on property located in CA, the gain would be taxable by both states, but you'd be able to take a credit on your CO return for taxes paid to CA.
Don't know if this answers your question.
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.