Washington County Oregon is announcing that the 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.

Washington County says that the 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.

A D V E R T I S E M E N T

A D V E R T I S E M E N T

Washington County says that the 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.

Kathryn Harrington is the Chair, At Large of the Washington County Board of Commissioners.

Those interested can learn more about the Transportation Development Tax and the Transportation System Development Charges online, or view the Transportation Development Tax Rate Schedule.


--Bruce Armstrong

Post Date: 2023-04-25 17:06:13

Last Update: 2023-04-25 17:56:56