Last updated: August 2026

Multi-State Payroll Tax. Reciprocity, Withholding & Nexus

Multi-state payroll is where errors multiply. Wrong state withholding, missed reciprocity agreements, and nexus triggers that create registration obligations employers don’t know they have.

Withholding across state lines

• Multi state payroll tax how one remote worker triggers nexus, withholding, and SUTA assignment
• State tax reciprocity agreements the active agreement pairs and the exemption forms they require
• Convenience of the employer rule how it sources remote work days, which states apply it, and the Form IT-2104.1 percentage most employers get wrong

State leave and pay rules

• Paid sick leave in California the statewide rule and the city ordinances layered on top of it
• Reporting time pay in California the show up pay rule that catches employers based out of state
• Paid Leave Oregon employer contribution mechanics, the OFLA overlap, and Form OQ remittance
• FMLA in Colorado how unpaid federal job protection stacks with the state FAMLI benefit