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Property Tax

MyDec Data Files

MyDec data files include the information from every recorded Real Estate Transfer Declaration submitted through the online MyDec system for the given year in a tab-delimited text file. The data for current year is updated on a quarterly basis. A declaration includes the following:

and may also include:

The Layout / File Format link explains the layout of the information presented.

Note: Private and personal information has been excluded from the data pursuant to the Illinois Freedom of Information Act. The accuracy of any declaration recorded through MyDec has not been verified by the Department and does not include the prior year’s assessment information.


Layout / File Format (Version 1.0)


Layout / File Format (Version 1.0)


Layout / File Format (Version 1.0)


Layout / File Format (Version 1.0)


Layout / File Format (Version 1.0)