How is sales tax exposure calculated across different states?

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Sales tax exposure is a critical issue for businesses engaged in multistate sales, especially after the Supreme Court’s decision in South Dakota v. Wayfair (2018), which fundamentally changed the landscape of Sales Tax Nexus. Calculating sales tax exposure across different states requires a detailed understanding of each state’s economic nexus thresholds, the types of sales included in those thresholds, and the specific compliance requirements imposed by each jurisdiction.

1. Understanding Sales Tax Nexus and Economic Nexus Standards

Sales tax nexus refers to the connection between a business and a state that is sufficient to require the business to collect and remit sales tax on sales to customers in that state. Historically, physical presence (such as employees, inventory, or offices) was required to establish nexus. However, after Wayfair, states can impose sales tax collection obligations based solely on economic activity within the state, even if the seller has no physical presence.

Most states now use a Sales Tax Economic Nexus standard, typically based on either a sales revenue threshold, a transaction count threshold, or both. For example, many states require remote sellers to collect and remit sales tax if they have more than $100,000 in sales or 200 transactions in the state during the previous or current calendar year. However, some states have eliminated the transaction count threshold and rely solely on a dollar threshold (e.g., California at $500,000, Texas at $500,000, and New York at $500,000 in sales and more than 100 transactions).

2. Calculating Sales Tax Exposure Across States

To calculate sales tax exposure, a business must:

• Identify all states where it makes sales: This includes both direct sales and sales through marketplace facilitators.
• Determine the type of sales included in each state’s threshold: Some states count only taxable sales, while others include all gross sales, including exempt sales. For example, Michigan includes both taxable and exempt sales in its $100,000 or 200 transaction threshold.
• Review the measurement period: Most states use the previous or current calendar year, but some use a rolling 12-month period or a specific period ending on a certain date (e.g., Connecticut uses the 12 months ending September 30).
• Compare sales and transaction data to each state’s thresholds: If the business exceeds the threshold in a state, it has sales tax nexus and must register, collect, and remit sales tax in that state.
• Consider marketplace facilitator laws: In most states, marketplace facilitators are required to collect and remit sales tax on behalf of third-party sellers. However, sellers must still include marketplace sales when determining if they meet a state’s economic nexus threshold.

3. State Tax Compliance and Multistate Sales Tax Complexity

Tax compliance is complicated by the lack of uniformity among states. Each state may have different definitions of taxable sales, different thresholds, and different rules for when registration and collection must begin. For example, some states require registration and collection on the next transaction after the threshold is met, while others allow a 30-day grace period.

Additionally, some states include digital goods and services in their sales tax base, while others do not. Businesses must also be aware of local sales taxes, which can add another layer of complexity, especially in states like Colorado and Louisiana, where local jurisdictions may have separate registration and remittance requirements.

4. Tax Exposure Calculation and Sales Tax Liability

Tax exposure calculation involves quantifying the potential tax liability from sales in each state where nexus exists but tax has not been collected and remitted. This requires:

• Reviewing historical sales data to determine when nexus was first established in each state.
• Calculating the amount of uncollected sales tax for each period since nexus was established.
• Considering interest and penalties that may apply for late registration or remittance.

Businesses should also consider whether they have any physical presence, click-through, or affiliate nexus in addition to economic nexus, as these can create additional exposure.

5. Managing Sales Tax Exposure: Voluntary Disclosure Agreements (VDA Process)

If a business discovers it has sales tax exposure in one or more states, it may be able to mitigate penalties and interest by entering into a Voluntary Disclosure Agreement (VDA) with the state. The VDA process allows businesses to come forward voluntarily, disclose their liability, and settle past tax obligations, often with reduced penalties and a limited lookback period. This is a valuable tool for managing historical tax liability from sales and achieving tax compliance with the state.

6. Government Sources and Post-Wayfair Developments

Government sources such as state departments of revenue, administrative bulletins, and statutes provide the authoritative rules for sales tax nexus and compliance. For example, Michigan’s Revenue Administrative Bulletin 2021-22 and similar documents in other states outline the specific requirements for remote sellers. The Wayfair decision and subsequent state legislation (the “one big beautiful bill act” refers to the wave of post-Wayfair state laws) have made it essential for businesses to monitor changes in state law and update their compliance processes accordingly.

Conclusion

Calculating sales tax exposure across different states is a complex, ongoing process that requires careful tracking of sales data, understanding of each state’s nexus standards, and proactive compliance management. Businesses must regularly review their multistate sales tax footprint, monitor legislative changes, and consider the VDA process if they discover past noncompliance. By doing so, they can minimize sales tax liability, avoid penalties, and ensure full state tax compliance in the evolving landscape of sales tax nexus.

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