Washington

A foreign entity may not do business in Washington until it registers with the secretary of state. Activities of a foreign entity that do not constitute doing business include, but are not limited to:

(a) Maintaining, defending, mediating, arbitrating, or settling an action or proceeding, or settling claims or disputes;
(b) Carrying on any activity concerning its internal affairs, including holding meetings of its interest holders or governors;
(c) Maintaining accounts in financial institutions;
(d) Maintaining offices or agencies for the transfer, exchange, and registration of securities of the entity or maintaining trustees or depositories with respect to those securities;
(e) Selling through independent contractors;
(f) Soliciting or obtaining orders by any means if the orders require acceptance outside this state before they become binding contracts and where the contracts do not involve any local performance other than delivery and installation;
(g) Creating or acquiring indebtedness, mortgages, or security interests in property;
(h) Securing or collecting debts or enforcing mortgages or security interests in property securing the debts;
(i) Conducting an isolated transaction that is completed within thirty days and that is not in the course of repeated transactions of a like nature;
(j) Owning, without more, property;
(k) Doing business in interstate commerce; and
(l) Operating an approved branch campus of a foreign degree-granting institution

Remote sellers and marketplace facilitators that have $100,000 of gross retail sales or 200 retail transactions in the state during the current or prior calendar year are required to collect and remit sales tax on all taxable retail sales in Washington.