In Feb. the president retroactively reinstated the Residential Energy Eff Tax credit. You can not carryforward related expenses, you can carryforward the unused portion of the $500 credit. Which means only 2017 expenses would be deductible against the unused portion of the energy credit. Do note the IRS still has not updated forms for this credit and TT can not until the IRS does. This was one of many last minute tax changes.
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