My guess is that you will get a refund at the end of the year. Of course, now you'll have to track how much in "taxes" you paid, so you can ask for the right amount back.
Jolly. I suppose if this bill passes it will provide further incentive for me to shop locally or, indeed, exclusively--especially as Portland _has_ shops in which it is a joy to purchase goods. I dislike the further record-keeping burden it places on each citizen, though that's somewhat par for the course in the US tax code.