HB1514 – Extends tax exemptions for commuter ride sharing vehicles to any carpool or vanpool transporting at least three people, including the driver.
Prime Sponsor – Representative Taylor (D; 30th District; Federal Way) (Co-sponsors Ramos, Harris-Talley – Ds)
Current status –
In the House – Passed
Referred to the House Committee on Transportation; had a hearing February 17th. Replaced by a substitute, voted out of committee, and referred to Rules February 22nd. Passed by the House March 5th. House concurred in the Senate’s amendments April 13th.

In the Senate – Passed
Referred to the Committee on Transportation. Had a hearing March 15th, and passed out of committee March 25th. Referred to Ways and Means;  had a hearing March 31st;  amended, passed out of committee and referred to Rules April 2nd. Passed by the Senate April 8th.
Next step would be – To the Governor.
Legislative tracking page for the bill.
SB5457 is a companion bill to this.

Summary –
Amendment in Ways and Means –
This would limit the tax exemption for vehicles that aren’t operated by a pubic transit agency to those with at least five passengers.

Substitute –
There’s a summary of the changes made by the substitute at the beginning of it. (It now specifically excludes ride hailing companies’ vehicles along with a variety of others, removes the changes to the definition of a “commute trip”, and makes other small changes.)

Original bill –
Currently, the Commute Trip Reduction Incentives Act provides tax exemptions for vehicles that will be used for at least three years in commuter car pools or van pools making one round trip a day. They’re exempted from the State sales and use taxes, and from the motor vehicle excise tax. (It also exempts them from the regulations applying to drivers or owners of motor vehicles operated for hire, common carriers and public transit carriers, and protects those promoting ride sharing from any civil suits arising from the maintenance or operation of the vehicles.)

The bill expands the scope of these provisions by dropping the references to commuting, and redefining ridesharing as any “carpool or vanpool arrangement whereby one or more groups” of at least three people and not more than fifteen, including the driver, are transported. (I don’t know if this definition would include operations like Uber Pool or not.)