How do you find out if I owe car taxes?

Don't worry about it. Wait, and they'll send you a bill.

Of course doing the above would likely expose you to (more) substantial penalties and interest charges...as well as if you try to do anything financial before hand, probably become a problem if picked up on credit/lien report...or if you want to sell the car a problem because you may not be able to clear title to give to the seller...and also of course, if your delinquent and it goes on your credit report, it will be there for 7 years at least....but other than those minor issues, it is one possible way to respond.

I don't know of many "car taxes", but there are several different taxes involving cars you could be speaking of. Sales Taxes or Porperty Taxes are 2. Or do you mean registration fees?

Each is handled by a different jurisdiction; simply calling the one your worried about will probably get your status.

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Regarding the first answer above . . . I was assuming the writer was asking about excise tax, since all other 'car taxes' are paid at the time of purchase. You CANNOT find out if you owe excise tax UNTIL you are sent a bill. This will not incur any of the penalties specified in the second answer.