This legislation aims to streamline state income tax obligations for employees who perform their duties in more than one state. Its primary purpose is to limit the circumstances under which a non-resident state can tax an individual's wages or remuneration, thereby simplifying compliance for mobile workforces. Under the bill's provisions, an employee's income will only be subject to taxation in their state of residence or in a non-resident state where they are physically present and performing employment duties for more than 30 days during a calendar year. This threshold prevents states from taxing individuals who spend only a brief period working within their borders. Correspondingly, state income tax withholding and reporting requirements are tied directly to this 30-day taxation rule, ensuring employers only withhold taxes for states where the employee is genuinely liable. The bill includes important operating rules for employers to ensure compliance. Employers may generally rely on an employee's annual determination of time expected to be spent in various states, unless there is actual knowledge of fraud or collusion. However, if an employer maintains a daily time and attendance system that tracks an employee's work location, the data from that system must be used instead of the employee's declaration. Notably, certain categories of workers, such as professional athletes, entertainers, qualified production employees, and public figures, are explicitly excluded from these new provisions. This Act is designed to take effect on January 1 of the second calendar year following its enactment. It will not apply to any tax obligations that accrued before this effective date, ensuring a clear transition. The overall goal is to reduce the complexity and burden associated with multi-state income tax compliance for both employees and their employers.