Washington compliance for international consultants

Research complete: I collected authoritative Washington and federal guidance on compliance for international consultants providing services to Washington clients or registering an entity in Washington. Sources include Washington Department of Revenue (registration, B&O tax, filing timelines), Washington Secretary of State (Foreign Registration Statement requirements, UBI, registered agent, fees), and the IRS (withholding for payments to foreign persons, Forms W-8BEN/W-8BEN-E, Forms 1042/1042-S, Form W-7 ITIN). I extracted action items, thresholds (including Washington's $100,000 economic nexus for sales/B&O), registration steps, required forms and filings, employer obligations (payroll/unemployment/workers’ comp), and withholding/reporting responsibilities when paying foreign persons. These findings form the basis to create comprehensive, state-specific blog and newsletter content for the user's target audience (US business owners, LLC founders, foreign entrepreneurs).