During the 10 days preceding a primary, general, or special election in which the candidate's name is on the ballot, the campaign's books of account showing all contributions received, expenditures made and outstanding debts must be opened for public inspection.
An inspection may occur on weekdays beginning on the eighth day before the election — excluding legal holidays — by appointment between 9 a.m. and 5 p.m. at the location agreed up by both the treasurer and the requester or electronically in lieu of in-person inspection. If the treasurer and requestor are unable to agree on a location and the treasurer has not provided digital access to the books of account, the default location for an appointment must be a place of public accommodation selected by the treasurer within a reasonable distance from the treasurer's office. However, if the treasurer is located out-of-state, the default location must be within the state of Washington and reasonably accessible to both parties. WAC 390-16-043
“Books of account” means a ledger or similar listing of contributions, expenditures and debts, such as a campaign or committee is required to file regularly with the PDC, but current as of the most recent business day. They must include the underlying source documents such as receipts, invoices, copies of contribution checks, copies of canceled checks for expenditures, digital transactions, notes, or other documentation concerning expenditures, orders placed, and loans. WAC 390-16-043
A note for self-funding candidates: A candidate who self-funds the entire campaign and elects to spend funds from a personal bank account instead of opening a campaign account must allow inspection of the bank account's check register and statements — just as a non-self-funding candidate must allow inspections of campaign-account registers and statements — when books of account are not kept up-to-date on a daily basis for possible inspection.