If you qualify for one of the Indiana disabled veteran property tax deductions but your property is assessed for less than the deduction is worth, you can put the unused part toward the excise tax on up to two vehicles. You get $2 of excise tax credit for every $100 of remaining deduction, up to $70. You cannot claim the vehicle credit and the property tax credit at the same time.
Request an IDVA Certificate of Eligibility for Disabled Veteran Property Tax Deduction, then apply the unused deduction through your local county auditor and the Indiana Bureau of Motor Vehicles when you register the vehicle.
Your IDVA certificate of eligibility, your VA disability rating letter, and documentation of how much of your property tax deduction is unused.