(1) A "sponsor" of an electioneering communication is defined in RCW 42.17A.005.

(2) For the purposes of RCW 42.17A.005, an electioneering communication is reportable by the sponsor to the commission when the communication, alone or in combination:

(a) Identifies the same candidate in one or more communications satisfying RCW 42.17A.005 (21)(a)(i) and (ii) or these rules;

(b) Is made by the same sponsor of one or more of the communications;

(c) When it, either alone, or in combination with one or more communications identifying the candidate by the same sponsor during the sixty days before an election, has a fair market or aggregate value of one thousand dollars or more; and

(d) Is not a communication excluded from the meaning of "expenditure" under RCW 42.17A.005 or by these rules.

(3) When the communications (including radio, television, electronic, mailings, billboards, newspapers, online, or periodicals) reach the one thousand dollar threshold, the sponsor must report to the commission as required by RCW 42.17A.305 within twenty-four hours of, or on the first working day after, the date the communication is first broadcast, transmitted electronically, erected, distributed, published online or by other media, or otherwise presented to the public.

(4) Once the one thousand dollar threshold is reached, all subsequent electioneering communications by the sponsor identifying the same candidate are reportable as provided in RCW 42.17A.305 and this rule.

(5) When more than one sponsor pays for the electioneering communication, the entire fair market value of the communication is attributable to all sponsors. All sponsors of the same communication are responsible for reporting once the one thousand dollar threshold is met. A failure to report by one joint sponsor is not attributable to all joint sponsors of a specific communication or communications if the remaining sponsors have reported properly.

(6) Consistent with WAC 390-16-060 and the requirements of the PDC C-6 Report, a prorated portion of independent expenditure and electioneering communications expenditures must be attributed to each candidate or ballot proposition identified in the advertisement or communication. That proration must be based on a reasonable, good faith estimate of the value of the portion of the advertisement or communication relating to each candidate or proposition identified.