Sales tax obligations in the United States arise at the state level and depend on whether a business has sufficient connection, or “nexus,” with a particular state. While the concept is often presented in simple terms, in practice it requires careful consideration of how and where a business operates.
General framework
A business is generally required to collect and remit sales tax in a state where it has nexus. Historically, this was based on physical presence. More recently, economic activity has also become a determining factor.
As a result, nexus may arise either through physical presence in a state or through exceeding certain thresholds of sales or transactions within that state.
Physical presence
Physical presence remains a primary basis for nexus.
This may include:
maintaining inventory in a state
using warehouses or fulfillment providers
having employees or representatives located in the state
operating from an office or other facility
Even limited physical presence can be sufficient to create nexus, depending on the circumstances.
Economic nexus
In addition to physical presence, most states have adopted economic nexus rules.
These rules are typically based on:
total sales into a state
number of transactions
Once a threshold is exceeded, the business may be required to register, collect, and remit sales tax in that state, even without any physical presence.
The thresholds vary by state, but commonly include a sales threshold (e.g., $100,000 or higher) and, in some cases, a transaction count.
Role of structure and operations
Sales tax obligations depend not only on where customers are located, but on how the business is structured and how transactions are carried out.
For example, inventory held by a third-party fulfillment provider in a state may create nexus for the entity that owns the goods. Similarly, the use of distributors, agents, or other in-state representatives may affect the analysis.
In multi-entity structures, it is important to consider which entity is making sales and how activities are allocated across the structure.
Timing and registration
Nexus does not always require immediate action at the moment it arises, but it does establish an obligation to register and begin collecting sales tax within a reasonable period.
A common issue is that nexus arises before it is identified, particularly in cases involving economic thresholds or third-party fulfillment arrangements. This can lead to periods where tax should have been collected but was not.
As a result, monitoring activity across states is an important part of managing compliance.
Common issues
In practice, sales tax issues often arise where:
inventory is stored in states through fulfillment providers without being fully considered
economic thresholds are exceeded without tracking
the entity responsible for sales is not clearly defined
collection obligations are identified after the fact
These situations can create exposure that accumulates over time, particularly where sales volumes increase.
Practical approach
Managing sales tax obligations requires a structured and ongoing approach.
This typically involves:
identifying where physical presence exists
monitoring sales activity by state
determining when thresholds are met
registering and implementing collection where required
ensuring that systems reflect applicable state and local rates
The objective is to ensure that obligations are identified early and addressed in a consistent manner.
Conclusion
Sales tax nexus arises from the way a business operates across states, rather than from a single factor.
Understanding where nexus exists, and how it develops over time, is key to ensuring that obligations are properly addressed and that the structure remains aligned with the underlying operations of the business.