Charging Equipment Installation Here is the WA state sales tax exemption form that can be used for purchasing charging equipment & installation and EV batteries. If going into Tesla to purchase an extra UMC or WC bring the form with you. And At this time, the exemption goes thru 2020. The law can be read here. Vehicle tax exemption (first $32k) EV vehicles with a base price $42,500 and below qualify for the first $32,000 to be tax exempt. UPDATE: as of April 16, 2018 the state has announced the 7,500 has been reached and tax exemptions go thru May 31st, then expire. Registration Currently there is an additional $150/year surcharge for registering an EV. This is to take the place of the gas tax EVs are not contributing to. but no emissions testing! read more here. Sound Transit - Regional Transit Authority additional fee based on vehicle value Passed in the 2016 election, the RTA will now be adding a fee to vehicle registrations in their service area that is based on the vehicles MSRP (options and software are not included in the valuation - $35,000 for standard range, $44,000 for long range) with an annual standard depreciation rate. Info on the fee can be seen on the WDOLs site here.