Most states, including California, Texas, and Florida, do not require notarization for a bill of sale to be valid. Some real estate transactions may need to be notarized but that is normally not necessary.Not required to be notarized or witnessed. Not required for sales between California-licensed dealers. In California, for example, a bill of sale for a vehicle does not need to be notarized, while in Louisiana, notarization is required. In many cases, you are not legally obligated to notarize a bill of sale. While a bill of sale is generally valid without notarization, there are situations where it becomes a wise precaution. A notary is no longer needed to sell a car or give one away . But you must fill out the sale price .