What Is Income Tax Nexus?
Short answer
Income tax nexus is the connection between a business and a state strong enough to require the business to file and pay state corporate income tax there — typically created by having employees, property, or a certain level of sales activity in that state.
Last reviewed June 1, 2026
How income tax nexus differs from sales tax nexus
Income tax nexus and sales tax nexus are related but separate questions, and a company can have one without the other. States generally have more latitude to require income tax filings based on economic activity, and federal law (Public Law 86-272) provides limited protection for companies whose only activity in a state is soliciting orders for tangible goods — protection that doesn’t extend to services, software, or many modern business models.
What triggers income tax nexus
- Employees or contractors working in a state
- Owning or leasing property, including a home office for a remote employee
- Sales activity beyond the narrow protection of Public Law 86-272
- Passing a state-specific factor-presence threshold (a set dollar amount of sales, property, or payroll in the state)
Why this matters as companies grow and hire remotely
Remote hiring is now one of the most common ways companies unintentionally create new income tax nexus — a single employee working from home in a new state can be enough. An income tax nexus review, part of VPTax’s Corporate Income Tax service, tracks this as your headcount and footprint change so new filing obligations get caught before a state notices first.