Multi-state income tax filing obligations for remote freelancers triggered by single-day client site visits

Freelancers who travel to client offices in other states for even a single day of meetings can trigger income tax filing obligations in that state under 'economic nexus' or 'physical presence' rules, requiring them to apportion income, file non-resident returns, and potentially pay tax in states where they earned a tiny fraction of their annual income. So what? A freelance consultant based in Texas (no state income tax) who flies to New York for a two-day client workshop may owe New York state income tax on the income attributable to those two days, requiring a NY IT-203 non-resident return. So what? Filing in multiple states costs $200-$500 per state in tax preparation fees, which can exceed the actual tax owed, making short client engagements in high-tax states economically irrational. So what? Freelancers begin refusing in-person client meetings or adding 'travel tax surcharges' that clients find bizarre and off-putting, damaging the relationship. So what? The freelancer loses competitive advantage against local talent who does not face this cross-border friction, pushing them toward fully remote work even when in-person collaboration would produce better outcomes. So what? Client work quality suffers and the freelancer's business model becomes artificially constrained by tax geography rather than professional capability. This persists because state tax codes were written for an era of fixed employer-employee relationships with HR departments handling multi-state withholding. Freelancers have no employer to manage compliance, and the patchwork of state rules (some states have de minimis thresholds, others do not) makes it practically impossible to know obligations in advance without consulting a CPA for each state.