To get started, fill out a MV608 Title Application from Clay County, South Dakota's website. Here is the link to get the form. http://www.claycountysd.org/userfiles/files/Treasurer's%20forms/MV608.pdf
Mail the form along with a copy of your driver's license, copy of your social security card, title of the vehicle you are registering and a Bill of Sale. You will pay 4% sales tax. Once they receive your documents, it usually takes 2-3 days to process. They will mail you 2 new plates and your registration card to your home in the USA. You will attach one plate to the front of the vehicle and the other to the back. If you have any questions, I suggest calling Clay County Treasurer's office in South Dakota at 605-677-7123 or visit their website at http://www.claycountysd.org/treasurersoffice.cfm
Once the car enters into Mexico, you do not need to carry US automobile insurance. You only need to carry Mexican automobile insurance while driving the vehicle in Mexico. If you have a loan on the vehicle, you need to contact the company that you have the loan with to get authorized to drive the vehicle into Mexico. They may require you to keep your US automobile insurance. That means you will be paying Mexican and American automobile insurance. The driver of the vehicle does not have to have a South Dakota driver's license.
As for Mexican automobile insurance, there are a lot of companies online that sell this. I have always used Michele Jankovics at 845-473-1600. Her email address is firstname.lastname@example.org
If you are selling a vehicle with South Dakota plates, you will need to remove the plates before selling the vehicle to the next owner. Do not give the plates to the new owner. They must apply for plates themselves. You do not need to return the plates to South Dakota but you do need to contact Clay County's Treasurer Office to report the sale. If you are purchasing another vehicle, you can transfer your plates to another vehicle. You must call the Clay County Treasurer Office to transfer the plates.
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