Multi-State Nexus for E-Commerce: The Real Decision Tree

The Wayfair decision turned the sales tax map inside out. Before 2018, sales tax nexus required physical presence in a state. After Wayfair, economic activity alone triggers nexus, and the thresholds are low enough that a modestly successful Shopify store crosses them in dozens of states without ever trying to.

For the e-commerce operator, the post-Wayfair reality is a compliance problem the firm that set up the business often did not plan for. A DTC brand hitting $2 million in annual revenue on a 50-state distribution map may have registration obligations in 30 or more states, filing obligations in each, and quarterly or monthly compliance cycles the operator did not know were starting. The back-tax exposure for ignoring it compounds.

The income tax side is separate and often worse.

The sales tax decision tree

Start with the question: do you have economic nexus in a given state?

Most states adopted economic nexus thresholds in 2018 and 2019. The most common version is $100,000 in annual sales, and in states that still keep a 200-transaction test, crossing either one triggers nexus. The trend runs the other way: a growing list of states, including South Dakota itself, has repealed the transaction count and uses a dollar threshold alone. California uses $500,000. New York uses $500,000 AND 100 transactions (conjunctive, not disjunctive). The state-by-state matrix changes every year, which is exactly why it has to be checked, not remembered.

If economic nexus is triggered in a state, registration is generally required, even if the actual sales tax liability is small. Registration triggers filing obligations even for months with no sales. Failure to register after crossing the threshold is an exposure that grows by the year.

Next question: are marketplace facilitator rules helping you?

If you sell through Amazon, eBay, Etsy, or another marketplace that qualifies as a marketplace facilitator in the state, the marketplace is required to collect and remit sales tax on transactions through the platform. For a seller whose entire sales channel is Amazon, marketplace facilitator rules cover most of the obligation, and the seller’s direct registration burden is correspondingly reduced.

The catch: marketplace facilitator collection removes the collection obligation, not the filing obligation in states where the seller independently has nexus for direct sales through their own website or other non-marketplace channels. A DTC brand selling 60 percent on Amazon and 40 percent on Shopify in a state where they have nexus has to file in that state, even though Amazon is remitting on its share.

Third question: what is the registration-and-file cost relative to the liability?

In states where the seller has nexus and direct sales, the practical choice is to register, collect, and file. The alternative (ignoring the obligation) creates an exposure that grows. But the cost of compliance in 30-plus states is real: filing preparation, software fees for sales tax automation, and the time cost of reconciliation. For small sellers near thresholds, there is a legitimate question of whether to structure around crossing additional state thresholds versus accepting the compliance burden.

The income tax decision tree is different

Most e-commerce operators assume that sales tax nexus and income tax nexus are the same question. They are not.

Income tax nexus in most states requires either physical presence (offices, employees, inventory stored at a third-party warehouse) or economic activity above a higher threshold. Many states have adopted factor-presence nexus for income tax at $500,000 or $1 million in sales, which is meaningfully higher than the sales tax threshold. Other states still require physical presence for income tax.

Public Law 86-272 provides additional protection for income tax on sales of tangible personal property where the seller’s activity in the state is limited to solicitation. A DTC brand that ships product from out of state into a market where it has no physical presence may be protected from income tax nexus under 86-272 even where sales tax nexus applies. This is a meaningful difference, and a lot of e-commerce operators register for income tax unnecessarily because the sales tax analysis was not separated from the income tax analysis.

The states have been eroding 86-272 protection in recent years. California has taken aggressive positions about what constitutes “solicitation” in the age of interactive websites. New York and New Jersey have moved in similar directions. But the protection still exists in most states for sellers whose activity is limited to shipping product into the state.

For services (SaaS, digital products, non-tangible personal property), 86-272 does not apply. The income tax nexus analysis for a SaaS company looks very different from a DTC brand selling shirts.

The physical-presence trap

The single most expensive misstep we see is a seller who did not realize they had physical presence in a state and therefore treated the state as optional from a compliance perspective.

Physical presence is not just “do you have an office.” Physical presence includes:

• Inventory stored in a warehouse (including Amazon FBA warehouses in many states)
• An employee who lives and works remotely in the state
• A contractor who does sales calls in the state
• Equipment stored in the state
• Trade show attendance in some states
• Drop-ship arrangements where a supplier ships from the seller’s inventory located in the state

The Amazon FBA inventory issue is the big one for e-commerce operators. When Amazon routes inventory to a warehouse in Illinois, Texas, or Pennsylvania, the seller has physical presence in that state for sales tax purposes, regardless of whether economic nexus thresholds were otherwise met. States have been aggressive on this, and back-tax assessments with penalties and interest are a real risk for sellers who did not realize FBA inventory created the exposure.

The restructure-to-reduce-exposure option

For larger e-commerce operators, entity structure can reduce nexus exposure. A multi-entity structure that separates the inventory-owning entity from the customer-facing entity can, if structured properly, limit nexus at the customer-facing entity level to states where that entity has direct contact. This is not a loophole; it is a structural decision about where the nexus-creating activities actually happen.

The structuring has to be real. A paper-only separation that the state can see through does not work. The entities have to have genuine business purpose, separate operations, and arm’s-length transactions between them. Done properly, this can cut the multi-state compliance footprint significantly. Done poorly, it creates the appearance of avoidance and invites examination.

This is not a conversation to have with a preparer who sees the business once a year at tax time. This is an advisory conversation that precedes the restructuring and continues through implementation.

The practical starting point for a small DTC brand

For a brand doing $500,000 to $2 million in annual revenue, the starting point is usually:

1. Run a nexus study to identify every state where economic nexus, physical presence, or marketplace sales create an obligation
2. Register in every state where the obligation is confirmed
3. Set up sales tax automation (TaxJar, Avalara, or similar) to collect and remit at checkout
4. Separate the sales tax compliance function from the income tax compliance function and analyze each state independently
5. Watch the growth trajectory and revisit quarterly, because crossing a new state threshold creates a new obligation that cannot sit un-managed

None of this is exciting work. All of it is the cost of operating as an e-commerce business post-Wayfair. The firms that help their clients get in front of it are the firms whose clients do not end up with six-figure back-tax assessments three years in.

The expensive version of this conversation is the one that starts after the Illinois Department of Revenue has already issued the notice. The cheap version is the one that starts before the nexus is triggered.

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This article is for informational purposes only and does not constitute tax advice. The topics discussed depend on specific facts and current law, both of which change. A proper analysis of your situation requires professional review. Contact us to discuss whether this applies to your business.