Can I apply an energy credit that is being rolled to next year to an old tax bill?

 

Retirement tax questions

If you're talking about a carryback, then no, you can only carryforward.

This, from the Instructions for Form 5695:

Also, use Form 5695 to take any residential energy efficient property credit carryforward from 2016 or to carry the unused portion of the credit to 2018.

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