Transportation Development Tax to increase July 1, 2023

The Washington County Transportation Development Tax (TDT) rates will increase by 6.01%, effective July 1.

Once the increase takes effect, the TDT rate for a single-family detached home, for example, will be $10,599 – an increase of $601 more than the 2022-23 rate of $9,998.

TDT is based on the average estimated traffic generated by new development of that type and is paid by developers to fund transportation projects including road improvements, sidewalks, bike lanes and transit upgrades such as bus shelters. TDT rates are adjusted annually based on a five-year rolling average of road construction, labor and right-of-way costs.

The rate increase was approved April 18 by the Board of Commissioners. County code calls for the Board to act on TDT adjustments annually before May 1.

Visit Transportation Development Tax and Transportation System Development Charges or view the Transportation Development Tax Rate Schedule for more information.