Selling to a bar: the licence is the proof
Sales to a restaurant or bar with a spirits licence carry 13.7% plus $2.4408 per liter and wholesaling B and O; the proof is the buyer's liquor licence, not a reseller permit, and the seller keeps a copy (WA DOR, RCW 82.08.150).
Transcript
Dana Marco also sells to Linh's restaurant, for her bar.
Sal A sale to a restaurant or bar with a spirits licence carries lower rates, thirteen point seven percent and about two forty-four a liter, and it's wholesaling B and O. The proof is the buyer's liquor licence, not a reseller permit, and the store keeps a copy.