Tax Appraisal Districts and Municipal Boundaries

Determining Tax Appraisal Districts

Property-related taxes make up a huge part of the overall tax picture for most home and business owners. To calculate tax liability and file accurate documents, tax professionals and the software they use must take into account precise boundaries around properties to determine all relevant tax appraisal districts. This process often involves the use of several geographic data layers because many properties fall within more than one jurisdiction or tax district.

Maponics provides both nationwide geographic boundary datasets and GIS Mapping Services that help tax professionals and service providers systematically determine the tax appraisal districts applicable to residential and business properties. Service providers can license datasets for use in GIS applications or tap our extensive experience to geocode properties and perform spatial analysis to determine the set of relevant tax appraisal districts. Here are some of the datasets that can be leveraged to provide answers to tax jurisdiction questions.

Municipal Boundaries

Municipal Boundaries represent the official and legal perimeters of local governments and form the core of property tax appraisal districts. Typically, local property taxes are levied and regulated by local governments and are based on the location of properties. But because the official definition and recordkeeping process for municipal boundaries is different from region to region, and thousands change each year, tax professionals and service providers cannot rely on US Census data and do not have the resources to track this data themselves.

Contact Maponics about the Municipal Boundaries dataset.

School Boundaries

In many towns, the school portion of property taxes makes up a significant part of the total property tax bill. As a result, determining property locations within the correct school zone is a critical part of the tax calculation. Maponics offers the only product that includes not only school district boundaries but also specific school attendance zones for public primary, middle and high schools across the US. This additional level of granularity can be important when taxes are tied to large infrastructure projects at specific schools.

ZIP+4

In some cases, simply associating a set of properties with the geographic center point of their 9-digit ZIP Code provides enough property location information to determine the tax appraisal district. Since 9-digit ZIP Codes are widely available with property and parcel data, using a ZIP+4 database with centroids can be a simple way to cross reference properties to tax appraisal districts.

Maponics is the only GIS data provider to offer a premium ZIP+4 database online that includes centroids (latitude and longitude) to support spatial proximity analysis.

US Census Boundaries

The US Census Bureau provides numerous geographic boundary layers through TIGER that can be relevant to tax calculations and tax districts. Because taxes are levied at many administrative levels, tax professionals need to determine the bounding tax districts from the state level down to the most local level.

With more than 10 years of experience working with geographic datasets, Maponics offers the most current GIS data from the Census in a documented and easy to use form. Maponics US Census data includes the following layers:

• States
• Counties
• Minor Civil Divisions
• Census Places
• Core Based Statistical Areas