Commercial Solar Tax Benefits Explained [Federal Solar Tax Credit & Depreciation] 

If a business does not have enough tax liability to use the full tax credit the year the system is energized, it can carry it backward to recover paid taxes from prior years. For example, if the tax credit is $10,000 and the business only has enough tax liability in year one to use $8,000, the remaining $2,000 can be used to recapture $2,000 of paid taxes the prior year.