You should e-file once, using the corrected Form W-2. That corrected W-2 should serve as a replacement for your original W-2. You should be filing a Federal Tax Return and a CO State Tax Return using that corrected W-2.
Regarding your statement above "IE file twice, once for the wrong W-2 and once for the corrected W-2."
Did you e-file a MA State return and then e-file a Co State return?
If you already e-filed your tax return with the incorrect W-2 and it was accepted, you should wait until that return is processed and then file an amended MA return using the corrected W-2 information.
You will have to file a CO State Tax Return using the corrected W-2 information if you have not already done so..
If it did not affect your "Wages" and your "Federal Taxes Withheld" you do not need to correct/amend your Federal Return.
Click here for information on how to amend my state return in TurboTax.
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