A quick definition of double assessment:

Double assessment is when someone is required to pay taxes twice for the same property. This is not fair and is called double taxation. There are other types of assessments, like when the government determines how much tax someone should pay based on the value of their property or the benefits they receive from public improvements. These assessments are important for funding things like roads, sidewalks, and sewage lines. However, double assessment is not allowed and is considered unfair.