I've been working on this one. I see what the system is doing. To work around this, you will need to add a Colorado line to your W-2, even though you put a zero income there. Then, the system will allow you to enter allocation information into the Mass return. When I selected the PY & NR, it was returning all of the taxes paid to MA, which is also incorrect. So it was necessary to create a way to get the Non-MA portion into the system. When I did this, I could. As you mention, allocating in Colorado is not difficult. This is how you can get it right, but there's a good chance that you might not be able to e-file. If this is the case, mail in the return and explain the time of the move as well as the amount you earned telecommuting from Colorado. But a PY return is the correct return, because you had no NR income technically speaking.
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