30% Federal Tax Credit
Receive 30% of the full system cost back as a credit against your total tax liability for the year your system was installed. If the credit exceeds your liability for that tax year, the remaining unused dollar amount can be carried forward to the next year and added to the Residential Energy Tax Credit for that year.
This tax credit is 30% for systems ‘placed in service’ by the end of 2019. After that the tax credit diminishes and expires entirely at the end of 2021 (system must be placed in service by the end of 2021) Learn more detail (including the IRS form) at Dsireusa.org,
Always contact a trusted tax professional to verify eligibility in your specific case.