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To my knowledge, we have the February 2018 count of eligible vehicles (6843), and the average rate of new EV registrations in Washington is 275 per month.
The tax exemption expiration is triggered by that 7500-vehicle report from DOL to DOR, and then it switches to a sunset date: the end of the month after the trigger month.
So if we hit 7500 vehicles in April, the exemption will expire at the close of business on May 31 (a Thursday).
My understanding is that you become exempt from the sales tax at the time that you would pay it, which is when you apply for title and registration of your vehicle. New vehicles have that application made by the dealer.
So my question is: could I take my VIN number to the DOL agency office and apply for a registration ? Or is this totally out of my hands and I have to hope Tesla files the paperwork the same day I take delivery ?
The sale tax for me was computed at time of sale/delivery. The sales tax line on the bill of sale excluded the first 3200 in sales tax. It was done automatically by Tesla. Hence the sales tax on the car was around $2300 rather then $5500.