Hot topic – if you have or will be installing geothermal in your Iowa home in 2019, the tax credit has changed for Iowa! You are now required to apply for the credit. The Department of Revenue approves applications, and you must have the approval before claiming the credit on your tax return. Deadline to apply is May 1st following the year of installation.
More information here: https://content.govdelivery.com/accounts/IACIO/bulletins/247f984