No on 645 has raised about $12.8 million, 89% of it from unions; Washington public-sector unions alone gave $7.4 million (58%). The two committees backing I-645 raised about $6.2 million combined from individuals and businesses, and Let's Go Washington's share also funds two other measures.
| amount | committee | donor_group |
|---|---|---|
| 7378894.38 | No on 645 | WA public-sector unions |
| 1700000 | No on 645 | National public-employee unions |
| 2352102.76 | No on 645 | Other unions and labor federations |
| 1132658 | No on 645 | Individuals |
| 232758.04 | No on 645 | Businesses, groups and small donors |
| 0 | Vote Yes Repeal the Income Tax | WA public-sector unions |
| 0 | Vote Yes Repeal the Income Tax | National public-employee unions |
| 0 | Vote Yes Repeal the Income Tax | Other unions and labor federations |
| 1262515 | Vote Yes Repeal the Income Tax | Individuals |
| 942570 | Vote Yes Repeal the Income Tax | Businesses, groups and small donors |
| 0 | Let's Go Washington (3 measures) | WA public-sector unions |
| 0 | Let's Go Washington (3 measures) | National public-employee unions |
| 0 | Let's Go Washington (3 measures) | Other unions and labor federations |
| 3289309.7 | Let's Go Washington (3 measures) | Individuals |
| 714583.02 | Let's Go Washington (3 measures) | Businesses, groups and small donors |