This page includes forms, fees, and instructions for all domestic business entities, foreign and domestic Registered Agents, and Washington Trademarks. How to incorporate in Washington state.Choosing a corporation name, appointing a Board of Directors and creating Corporate Bylaws, and more! There are two ways to form a corporation you can form one yourself or you can hire a service to do it for you. Eight easy steps to successfully launching your new corporation today. Total cost, time, and step-by-step instructions on how to incorporate in Washington. Do it yourself or purchase our incorporation service. To incorporate in Washington, you must file the Washington Initial Report within 120 days of your incorporation date. Each state has its own personnel requirements for incorporating. Build trust, don't chart a vision (yet).