When Employees Cross State Lines: Payroll Tax Risks Human Services Organizations Should Know

By Robin Brand, on October 22nd, 2026

Human services organizations often operate in environments where employees’ responsibilities are not confined to a single office or program location. Employees may travel across state lines to provide services, support programs or facilities, attend training, fill temporary staffing needs, participate in meetings, or assist other locations. While these arrangements may be routine from an operational perspective, they can create payroll tax obligations that are easily overlooked.

An employee does not necessarily need to relocate or work in another state for an extended period before an organization needs to consider the payroll tax implications. Temporary or recurring work across state lines can be enough to warrant a closer look.

Understanding the rules before employees cross state lines can help reduce audit risk, avoid costly assessments, and minimize administrative burdens for both employers and employees.

Understanding the Compliance Risks for Human Service Providers

Temporary work assignments across state lines can create significant tax compliance challenges for both employers and employees. For human services providers, these issues may arise in ways that do not initially appear to be “out-of-state assignments.” An employee may periodically support a program in a neighboring state, provide temporary coverage at another location, attend training or meetings, or perform community-based services outside the employee’s normal work state.

For employers, failing to properly track where employees perform services can result in missed withholding, registration, and unemployment tax obligations, leading to assessments for unpaid tax, penalties, and interest.

The consequences are not limited to the employer. From the employee’s perspective, failing to identify multistate payroll tax obligations upfront can create significant tax filing complications. If it is later determined that the employee had a nonresident income tax return filing requirement and there was no state tax withheld, correcting this issue often requires preparing previously unfiled nonresident income tax returns, paying any resulting tax, interest, and penalties, and amending resident state income tax returns to claim credits for taxes paid to other states.

This process can be time-consuming, costly, and frustrating for employees who reasonably expected payroll withholding obligations to be addressed through their employer’s payroll process. For an organization whose employees may already travel between programs and service locations as part of their normal responsibilities, identifying these situations before they become a year-end tax issue can benefit both the organization and its workforce.

State Payroll Withholding Requirements Vary Widely

States take significantly different approaches to nonresident payroll withholding requirements. Some states require withholding from the first day an employee performs services within the state, while others provide de minimis exceptions based on the number of days worked, wages earned, or both. In addition, employers must consider reciprocity agreements between certain states, as well as varying registration and reporting requirements.

This makes it particularly important for organizations operating near state borders or supporting programs in multiple states to understand not only where employees are assigned, but where they actually perform their services.

Payroll Tax Compliance Extends Beyond Income Tax Withholding

Employers should also be aware that payroll tax compliance extends beyond state income tax withholding. Temporary work assignments may raise questions regarding state unemployment insurance reporting, particularly when employees regularly perform services in multiple states. While unemployment tax sourcing rules generally differ from state income tax withholding rules, employers should evaluate both sets of requirements when employees perform services across state lines.

Human services organizations with employees who routinely travel between programs, facilities, client locations, or other service locations should therefore consider whether their existing payroll processes adequately capture where employee services are being performed.

How Bonadio Can Help 

Managing multi-state payroll tax compliance can be complex, especially when employees work across multiple jurisdictions with varying rules and requirements. The Bonadio Group’s State and Local Tax (SALT) team can help human services organizations evaluate their payroll tax obligations, navigate state registration and withholding requirements, and develop processes to minimize compliance risk.

For organizations with decentralized or mobile workforces, a practical first step is understanding how employee work locations are currently identified, communicated to payroll, and monitored when employees temporarily perform services outside their normal state.

If you have any questions or are interested in learning more, we are here to help. Please do not hesitate to reach out to discuss your specific situation.

This material has been prepared for general, informational purposes only and is not intended to provide, and should not be relied on for tax, legal or accounting advice. Should you require any such advice, please contact us directly. The information contained herein does not create, and your review or use of the information does not constitute, an accountant-client relationship.

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Written By

Robin Brand
Robin Brand
Principal

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