How long do you have to register a vehicle

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https://dor.mo.gov/motorv/titling.php. Missouri Resident Titling Requirements You have 30 days from the date of purchase to title and pay sales tax on your newly purchased vehicle. If you do not title the vehicle within 30 days, there is a title penalty of $25 on the 31st day after purchase. The penalty increases another $25 for every 30 days you are late with a maximum penalty of $200.