STEP ONE: Determine the number of months remaining until the vehicle's next registration date under IC 9-18.1-11-3. A partial month shall be rounded up to one (1) month.
STEP TWO: Multiply the STEP ONE result by one-twelfth (1/12).
STEP THREE: Multiply the annual excise tax for the vehicle by the STEP TWO product.
If the credit is not fully used within ninety (90) days of the sale, destruction, or other disposal of the vehicle and the amount of the credit remaining is at least four dollars ($4), the bureau shall issue a refund to the owner in the amount of the unused credit, less a fee of three dollars ($3) to the bureau to cover costs of processing the refund, which may be deducted from the refund. The bureau shall deposit the fee for processing the refund in the commission fund established by IC 9-14-14-1. To claim the credit and refund provided by this subsection, the owner of the vehicle must present to the bureau proof of sale, destruction, or disposal of the vehicle. Any vehicle excise tax refund issued under this subsection shall be paid out of the special account created for settlement of the excise tax collections under IC 6-6-5-10.
STEP ONE: Determine the number of full calendar months between the month in which the owner would have been required to register if there had been no name change and the owner's new regular annual registration month.
STEP TWO: Multiply the STEP ONE amount by one-twelfth (1/12).
STEP THREE: Determine the owner's tax liability computed as of the time the owner would have been required to register if there had been no name change.
STEP FOUR: Multiply the STEP TWO product by the STEP THREE amount.
IC 6-6-5-7.2