ARM 42.4.207
ARM 42.4.207. RECORD RETENTION REQUIREMENTS
Cite as Mont. Admin. R. 42.4.207
(1) A taxpayer claiming the credit is required to retain invoices, sales agreements, or receipts that document the work done and the equipment installed. The records should clearly state the equipment manufacturer, make and model number of any installed item or product that will determine the qualifications for the energy conservation credit.