Here is the known truth.
The Government ALWAYS gets their money.

They have the manpower to pursue it to the ends of the USA.

I would recommend this to any person buying a car.

Call or get online to your specific State DMV.
They have the answer.

I learned (thankfully) that had I slapped down the cash and driven the car away,
I would have a very difficult and expensive mess on my hands.

Many people believe that a bill of sale is good enough.
Where I live it is used for toilet paper.
It means nothing more than proof that you bought a vehicle.
Probably not notarized, it's worthless.

I did learn that in my state, you can type in the VIN.
it will spit back a taxable dollar amount.
Surprisingly, my X5 of interest is "worth" or taxable value is 80% of 3600 dollars.
As I have done every time in the past, I tell the tax collector what I ACTUALLY paid for the vehicle.

It is THOUSANDS more than the minimum tax that WILL be assessed.

From here on out I will tell them I paid 5 dollars more than their
"Taxable value"

If you are a tax collector please disregard this posting.

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2003 4.6is X5
2003 525it
2003 E53 X5 Standard shift