If you want, all deals can include sales tax. If you live in Kansas they can cut you a check and include it in the financing. If Missouri, it can be included in the loan and paid at the dealer. Your trade in can be your down payment if it is worth enough.
If you're asking is there tax included on the amount that you trade in the vehicle or your trade-in amount? No. They don't give you tax on top of your trade-in or charge you tax on top of your trade-in amount.
They can finance sales tax, just make sure you let them know.
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