An "aggrieved party" is any interested party who receives an adverse decision from:

(1) The department for which the department has provided notice of appeal rights;

(2) The office of administrative hearings; or

(3) The commissioner's review office.

"Calendar quarter" has the meaning provided in WAC 192-500-020.

(1) An "employer" is:

(a) Any individual or type of organization, including any partnership, association, trust, estate, joint stock company, insurance company, limited liability company, or corporation, whether domestic or foreign, or the receiver, trustee in bankruptcy, trustee, or the legal representative of a deceased person, having any person in employment or, having become an employer, has not ceased to be an employer as provided in this chapter;

(b) The state, state institutions, and state agencies;

(c) Any unit of local government including, but not limited to, a county, city, town, municipal corporation, quasi-municipal corporation, or political subdivision; and

(d) A franchisee.

(2) "Employer" does not include the United States of America.

(3) The term employer is used for both employer and employer agent.

(4) This section does not apply to:

(a) Any self-employed person or federally recognized tribe that has not elected coverage under Title 50B RCW; or

(b) Any person performing casual labor as defined in RCW 50A.05.010.

"Employer agent" has the meaning provided in WAC 192-500-015.

(1) In all determinations, cases, and appeals adjudicated by the employment security department under Title 50B RCW, the department is an "interested party."

(2) Other interested parties in determinations, cases, and appeals include:

(a) The employee or former employee; and

(b) An employer or former employer of that employee that is required to provide information to the department related to the determination or appeal in question.

(3) The department may designate an employee or employer as an interested party in other determinations made by the department.

A "self-employed" person has the meaning provided in WAC 192-500-170.

(1) Unless otherwise specified, the terms "mail," "provide," "file," "submit," and "send" are interchangeable and mean to properly transmit, deliver, or distribute:

(a) By email or other electronic services; or

(b) In another format approved by the department.

(2) This section does not apply to appeals filed under Title 50B RCW.