Idaho State Tax Commission

Introduction to GIS TCA Data

All Idaho property lies within a combination of taxing districts. When taxing district jurisdictional boundaries overlap, they form a unique entity known as a Tax Code Area (TCA).

Taxing districts submit boundary changes and annexations to the Idaho State Tax Commission throughout the year. The GIS staff maps these district boundary changes and assigns the correct Tax Code Area (TCA) for the upcoming year.

District boundary changes and annexations submitted to the Tax Commission throughout a calendar year will actually take effect during the next calendar year. For example: requests submitted to the Tax Commission during the calendar year 2021 will take effect in the calendar year 2022.

You can view and download Tax Code Area data and Tax District maps. Free software is available for viewing the GIS data files. Printed maps can be ordered by completing and mailing this form:

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If you have any questions about these data files, please contact GIS.

Last updated Sept. 13, 2011

This information is for general guidance only. Tax laws are complex and change regularly. We can't cover every circumstance in our guides. This guidance may not apply to your situation. Please contact us with any questions. We work to provide current and accurate information. But some information could have technical inaccuracies or typographical errors. If there's a conflict between current tax law and this information, current tax law will govern.