Wash. Rev. Code § 82.44.035
(1) For the purpose of determining any locally imposed motor vehicle excise tax, the value of a truck or trailer shall be the latest purchase price of the vehicle, excluding applicable federal excise taxes, state and local sales or use taxes, transportation or shipping costs, or preparatory or delivery costs, multiplied by the following percentage based on year of service of the vehicle since last sale. The latest purchase year shall be considered the first year of service.
| YEAR OF SERVICE | PERCENTAGE |
| 1 | 100 |
| 2 | 81 |
| 3 | 67 |
| 4 | 55 |
| 5 | 45 |
| 6 | 37 |
| 7 | 30 |
| 8 | 25 |
| 9 | 20 |
| 10 | 16 |
| 11 | 13 |
| 12 | 11 |
| 13 | 9 |
| 14 | 7 |
| 15 | 3 |
| 16 or older | 0 |
(3) For the purpose of determining any locally imposed motor vehicle excise tax, the value of a vehicle other than a truck or trailer shall be eighty-five percent of the manufacturer's base suggested retail price of the vehicle when first offered for sale as a new vehicle, excluding any optional equipment, applicable federal excise taxes, state and local sales or use taxes, transportation or shipping costs, or preparatory or delivery costs, multiplied by the applicable percentage listed in this subsection (3) based on year of service of the vehicle. If the manufacturer's base suggested retail price is unavailable or otherwise unascertainable at the time of initial registration in this state, the department shall determine a value equivalent to a manufacturer's base suggested retail price as follows:
(b) The year the vehicle is offered for sale as a new vehicle shall be considered the first year of service.
| YEAR OF SERVICE | PERCENTAGE |
| 1 | 100 |
| 2 | 81 |
| 3 | 72 |
| 4 | 63 |
| 5 | 55 |
| 6 | 47 |
| 7 | 41 |
| 8 | 36 |
| 9 | 32 |
| 10 | 27 |
| 11 | 26 |
| 12 | 24 |
| 13 | 23 |
| 14 | 21 |
| 15 | 16 |
| 16 or older | 10 |
[ 2010 c 161 s 910; 2006 c 318 s 1.]
Effective date—Intent—Legislation to reconcile chapter 161, Laws of 2010 and other amendments made during the 2010 legislative session—2010 c 161: See notes following RCW 46.04.013.