Can I e-file Massachusetts solar credits with Turbo Tax?

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No. TurboTax's handling of this is not that great.

1. If you haven't already, you must complete Schedule EC yourself. You can get a copy of the form from Mass DOR: https://www.mass.gov/files/documents/2018/02/08/dor-2017-inc-sch-ec.pdf

2. You enter the credit amount on the MA Credits screen as a "Business related non-refundable credit" - ignore the fact that you may not be a business.

3. Select the "Solar and Wind Energy Credit". Just enter the credit amounts - ignore the fields that don't apply to you.

TurboTax should generate Schedule CMS for you. You won't be able to e-file, as you need to send in the paper Schedule EC with your tax return.