In Washington, nonprofit organizations are generally taxed like any other business. This guide includes high-level information about starting a nonprofit and refers to other resources that go into more depth.The initial corporate meeting is the essential first step in forming a nonprofit organization. 501(c)(3) nonprofits apply using Form 1023 or Form 1023-EZ. An annual filing fee may be required. Failure to file could result in a nonprofit losing its "good standing" in the state. Required annual filings ; Agency: Washington Department of Revenue ; Form: Combined Excise Tax Return ; Instructions: Nonprofit Organizations Industry Guide ; Due:. Our services are limited to forming public benefit nonprofit corporations. In Washington, ensure you have a community issue to address before forming your nonprofit. Considered at such proposed meeting.