If a signer's only identification is expired, what is the general guidance for a notary?

The general standard is that identification must be current (unexpired). An expired ID should generally not be accepted as satisfactory evidence of identity unless the notary's state specifically permits IDs expired within a defined period (some states allow, for example, IDs expired within the last few years). Because rules vary by state, the notary must know their own state's requirements. If the available ID does not meet the standard, the notary can decline the notarization or rely on a permitted alternative such as credible witnesses. Accepting an unacceptable ID exposes the notary to liability if fraud later comes to light.