Authorizes the "Missouri No Tax on Car Loan Interest Tax Credit", relating to a tax credit for certain new motor vehicle loan interest payments

HB 2646 creates a Missouri tax credit for interest paid on new vehicle loans for qualifying cars, SUVs, trucks, or motorcycles assembled in Missouri and purchased after 2025. It directly affects Missouri residents who bought such new vehicles for personal use and paid loan interest, allowing them to claim a credit equal to the interest paid (up to $10,000 per year) against their state income tax. The credit phases out for taxpayers earning over $100,000 ($200,000 for joint filers) and excludes loans for commercial vehicles, leases, salvage-title vehicles, or loans to relatives. The credit expires after 2029 unless renewed by the legislature.