What is State Tax Nexus?
The minimum connection between a taxpayer and a state that allows the state to impose tax obligations.
Definition
State tax nexus is the minimum level of connection or presence a taxpayer must have with a state before that state can impose income tax or other tax obligations. Nexus can be established through physical presence, economic activity, domicile, or other factors. For US expats, state tax nexus determines whether they must continue filing state returns while living abroad. Some states maintain nexus based on domicile even after the taxpayer moves overseas.
Who Needs to Know This?
US taxpayers who move between states or abroad and need to determine which states they owe taxes to. Especially important for expats from states with aggressive nexus rules.
Key Deadline
Varies by state; generally aligned with federal April 15 deadline
Potential Penalties
Varies by state; underpayment penalties and interest for failure to file in nexus states
Related Forms
Common Mistakes to Avoid
- 1Assuming moving abroad automatically ends state tax obligations
- 2Not formally establishing domicile change when leaving a state
- 3Ignoring states that tax based on source income
- 4Not knowing some states have no mechanism to break nexus for expats
Related Terms
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