State tax filing

The Solar Energy, Small Hydropower System, Or Geothermal Machinery and Equipment Credit (SC SCH.TC-38) is a nonrefundable refund.

That means the credit amount can only reduce your tax liability. It is not added to your refund. If your tax liability drops to zero—and there is leftover credit—the amount is not added to your refund.

Check your forms. Your credit will appear on SC1040TC. All your credits will be transferred to line 13 (Other nonrefundable credits) on Form SC1040.