Allowing an employee to work from another state creates obligations for the employer in that state. The rules travel with the worker rather than staying with the office.
Location of work usually governs
Employment protections generally apply where the work is performed. An employee in another state is typically covered by that state's wage, leave and workplace rules.
That applies regardless of where the company is incorporated, where the payroll runs or what the offer letter specifies.
The consequence is that a single remote hire can bring an employer under a body of law it has never encountered.
Registration usually comes before payroll
Withholding and remitting state income tax generally requires registering with the state's revenue agency, and paying unemployment insurance requires registration with its labor agency.
Workers compensation coverage is also state-specific, and a policy written for one state may not cover an injury in another.
Many employers discover these requirements after the fact, when a filing is due and no account exists, which is a slower problem to fix than to prevent.
Rules differ in ways that affect daily practice
Minimum wage, overtime thresholds, meal and rest break requirements, paid sick leave, final paycheck timing and expense reimbursement all vary between states.
Some of these are operational rather than administrative. A policy written for one state can put a manager out of compliance in another without anyone noticing.
Notice and posting requirements apply as well, and electronic delivery is accepted in some states and not others.
Corporate presence can be triggered too
An employee working in a state can create nexus for the business, potentially requiring registration to do business there and creating filing obligations.
Thresholds and treatment differ by state, and some apply reciprocal arrangements while others do not.
Because the consequences reach beyond payroll into the company's own filings, this is a question for a tax professional rather than a payroll administrator.
Policy has to be decided rather than discovered
Employees relocate without asking, particularly when work is fully remote and the move looks like a personal matter.
Employers that require notification and approval of work location can assess obligations before they arise, rather than learning from a tax notice.
State employment rules differ substantially and change regularly, so a business employing across state lines needs employment counsel and a payroll provider that handles multi-state registration rather than a general template.