NY doesn't require you to sign in front of a notary. While a bill of sale is generally valid without notarization, there are situations where it becomes a wise precaution.The process of notarizing a car title, bill of sale, or any other commonly notarized document through NotaryLive is incredibly simple. A notarized bill of sale protects your interest and will make the transaction official. The document makes the ownership more secure. The quick answer is, usually, no. Generally when you sell your car, you won't need to worry about notarization. One of the most important steps in selling your car is the bill of sale. Here is everything you need to know about creating a bill of sale.