Costco: Seattle Sweetened Beverage Tax 2018

1/26/18. If you’ve recently walked the beverage isles at Costco in Seattle, you might have experienced some sticker shock. I know I did. The City of Seattle, Washington imposed a sweetened beverage tax that started on January 1, 2018. The standard rate for the sweetened beverage tax is 1.75¢ per ounce. If you buy a single sweetened drink at a grocery store, it’s not that noticeable. But with the…