Sales Tax Nexus for Multi-State Businesses: Physical vs. Economic Nexus Explained

Sales Tax Nexus for Multi-State Businesses: Physical vs. Economic Nexus Explained

Expanding into another state can create sales tax obligations before your business opens a storefront there.

Selling products across state lines, hiring employees, storing inventory, or opening another location may establish a connection with a state for sales tax purposes. Even online businesses with no physical presence can face collection requirements once their sales reach certain thresholds.

This connection is called sales tax nexus, and the rules vary across states.

For restaurant groups, franchise businesses, and multi-location operators, understanding nexus is an important part of expansion planning.

This guide explains physical and economic nexus, state thresholds, marketplace sales, registration requirements, and sales tax compliance. It also covers how to manage these responsibilities through accurate accounting and regular financial reviews.

Quick Answer: What Is Sales Tax Nexus?

Sales tax nexus is the connection between a business and a state that may require the business to register, collect, and remit sales or use tax on taxable transactions.

Nexus can arise through physical activities, such as operating a store, maintaining inventory, or employing workers in a state. It can also arise through economic nexus when a business reaches a state's applicable sales threshold without maintaining a physical location.

Exact requirements depend on state law.

Importantly, having sales tax nexus does not automatically mean every sale is taxable. Businesses must evaluate nexus, registration requirements, and the taxability of their transactions separately.

Sales Tax Nexus at a Glance

Businesses can establish nexus through different activities.

Marketplace activity is not always a separate legal category of nexus. It can affect economic nexus calculations and collection responsibilities under marketplace facilitator laws.

A business may have more than one type of connection with the same state.

Physical Nexus Explained

Physical nexus generally exists when a business has sufficient physical activities, personnel, or property within a state.

Common activities that may create physical nexus include:

• Operating an office or storefront.

• Opening a restaurant or another business location.

• Maintaining a warehouse or storage facility.

• Holding inventory, including inventory stored by third parties.

• Employing workers in the state.

• Using sales representatives or agents.

• Owning or leasing property or equipment.

• Conducting temporary activities, such as trade shows or certain in-person sales events.

The effect of each activity depends on state law and the specific circumstances.

For example, an online retailer based in New York may create physical nexus in California by maintaining inventory in a California fulfillment warehouse.

The retailer does not need to open its own storefront for physical nexus to become relevant.

Important: Physical nexus remains valid after the 2018 South Dakota v. Wayfair decision. The ruling expanded when states may require remote sellers to collect tax. It did not eliminate physical-presence rules.

Economic Nexus Explained

Economic nexus allows a state to impose sales tax collection obligations on certain out-of-state sellers based on their economic activity, even without physical presence.

It commonly affects businesses selling products through websites, online marketplaces, and other remote channels.

For example, a company operating only in State A could establish economic nexus in State B through sufficient sales to customers located there.

How Economic Nexus Is Measured

States may consider several factors:

• Sales revenue: The total value of qualifying sales into the state.

• Measurement period: The calendar year, preceding year, or another defined period.

• Sales included: Gross sales, taxable sales, exempt sales, or other defined categories.

• Transaction counts: Some states also apply a minimum number of transactions.

• Marketplace sales: States differ in how facilitated transactions affect the threshold calculation.

Reaching a threshold can create registration and collection responsibilities. However, the effective date and required actions depend on the state.

Businesses should monitor economic nexus sales tax requirements throughout the year rather than relying on one annual calculation.

How Did South Dakota v. Wayfair Change Sales Tax Rules?

In June 2018, the Supreme Court decided a case that reshaped the sales tax responsibilities of remote sellers: South Dakota v. Wayfair, Inc.

Before this decision, states generally could not require an out-of-state seller to collect sales tax without a physical presence in that state. The ruling removed that broad restriction.

As a result, states gained greater authority to enforce qualifying economic nexus laws against remote businesses.

The original South Dakota law discussed in the decision included a threshold of more than $100,000 in annual sales or at least 200 separate transactions.

That historical transaction test should not be confused with South Dakota's current requirements.

Under current guidance, South Dakota generally applies a threshold of more than $100,000 in gross sales during the previous or current calendar year for remote sellers. The former 200-transaction test no longer applies to those sellers.

Sources: U.S. Supreme Court, South Dakota v. Wayfair (2018) and South Dakota Department of Revenue.

Physical Nexus vs. Economic Nexus

Both types of nexus can create sales tax responsibilities, but they arise from different business activities.

A business can have both physical and economic nexus in the same state.

For instance, a retailer may maintain inventory in a state while also exceeding its economic nexus threshold.

Physical activities should be evaluated independently of sales volume.

What Activities Can Create Sales Tax Nexus?

Several routine business decisions can trigger a nexus review.

1. Opening a physical location: Stores, restaurants, offices, and other operating locations can establish physical nexus.

2. Hiring employees in another state: Employees working remotely or on-site may create a physical connection.

3. Storing inventory: Inventory held in another state can matter even when a third party manages the warehouse.

4. Using fulfillment arrangements: Warehouses and distribution services may create additional state connections.

5. Owning or leasing property: Equipment, buildings, and other business property can be relevant.

6. Making enough remote sales: Reaching a state's economic nexus threshold may trigger collection requirements.

7. Expanding franchise locations: New units can create obligations for the legal entities operating them.

8. Conducting in-state selling activities: Representatives, demonstrations, and certain temporary activities may establish nexus.

9. Acquiring another business: Acquisitions can introduce new locations, employees, assets, and registration responsibilities.

An activity that establishes nexus in one state might not produce the same tax consequences in another. Businesses should assess the facts before assuming that a particular activity creates or avoids nexus.

Economic Nexus Thresholds: Why There Is No Single U.S. Rule

There is no universal economic nexus threshold that applies across the United States.

Each state establishes its own requirements. Those rules can differ in six important areas:

• Dollar threshold.

• Transaction threshold, if applicable.

• Types of sales included.

• Measurement period.

• Marketplace sales treatment.

• Registration and collection timing.

Selected State Examples

The following examples summarize state tax authority guidance reviewed on November 2, 2026.

Official state sources:

• South Dakota Department of Revenue

• California Department of Tax and Fee Administration

• Texas Comptroller

• Florida Department of Revenue

• New York Department of Taxation and Finance

These examples show why businesses cannot use a single threshold in every state.

New York requires both a qualifying sales amount and transaction count. Texas uses a rolling measurement period, while Florida focuses on taxable remote sales in the previous calendar year.

Important: State sales tax nexus laws can change. Thresholds, measurement periods, included sales, marketplace rules, and registration timing must be verified with the relevant state tax authority before taking action.

These examples apply to the specified remote-seller rules. Physical presence or other activities may create obligations independently.

Sales Tax Nexus Does Not Automatically Mean Every Sale Is Taxable

Establishing nexus is only the beginning of a sales tax compliance review.

Businesses should follow this sequence:

Nexus → Registration-obligation analysis → Taxability → Sourcing and rate → Collection → Filing and remittance

Each stage answers a different question.

Consider an online seller whose sales into a state rise above the level specified in that state's economic nexus law. That may establish nexus, but it does not necessarily make every product or service the business sells subject to sales tax.

Some transactions may qualify for exemptions or fall outside the state's taxable categories.

The business still needs to determine whether registration or reporting is required.

This distinction matters for companies selling a combination of products, services, and exempt items.

Sales Tax Nexus vs. Sales Tax Rate

Sales tax nexus and sales tax rates are related but different concepts.

Sales tax nexus determines whether a state or jurisdiction may require a business to collect tax.

The sales tax rate determines how much tax applies to a taxable transaction.

A simplified calculation is:

Sales tax = Taxable sales amount × Applicable sales tax rate

For example, a $100 taxable purchase at an illustrative 6% rate would generate $6 in sales tax.

The example is for explanation only. Actual rates depend on the jurisdiction, applicable sourcing rules, and transaction.

Sales Tax Nexus vs. Income Tax Nexus

Sales tax nexus concerns potential sales or use tax collection responsibilities.

Income tax nexus concerns whether a state may impose income-based tax obligations on a business.

The two systems use different laws and standards.

A business may have sales tax obligations without having the same income tax obligations. The reverse may also occur.

For broader tax planning across jurisdictions, see QMK Consulting's guide to multi-state tax compliance.

Sales Tax Nexus and State Franchise Tax: Different Obligations

Although both terms relate to state taxation, they describe separate responsibilities that businesses need to evaluate independently.

Sales tax generally relates to taxable transactions and collection responsibilities.

State franchise tax is a separate business tax that some states impose based on factors such as taxable margin, net worth, or other statutory measures.

It does not necessarily relate to owning a franchise brand.

Franchise owners should evaluate sales tax and franchise tax obligations separately.

For additional background, see QMK Consulting's franchise tax and accounting compliance guide.

What Happens Once a Business Has Sales Tax Nexus?

Once a potential nexus trigger is identified, the business should follow a structured process.

1. Confirm the nexus trigger. Identify the activities, sales, or property establishing the connection.

2. Determine taxability. Review which products, services, and transactions are taxable.

3. Determine registration requirements. Confirm whether registration is required and when it must occur.

4. Configure sales tax collection. Update the website, POS, or accounting system after confirming the applicable obligations.

5. Determine the jurisdiction and rate. Apply the proper sourcing rules and state or local rates.

6. File required returns. Follow the state's filing frequency and reporting requirements.

7. Remit sales tax. Pay collected amounts according to the applicable deadlines.

8. Reconcile sales tax accounts. Compare tax collected, recorded liabilities, filed returns, and payments.

Businesses should not simply start charging customers sales tax after identifying a possible nexus trigger.

Registration and taxability requirements must be established first.

Marketplace Facilitator Rules

Marketplace facilitator laws can affect businesses selling through online platforms.

A marketplace facilitator is generally a platform that facilitates transactions between sellers and customers. Depending on state law, it may be responsible for collecting and remitting sales tax on qualifying transactions.

However, marketplace collection does not automatically eliminate every obligation for the individual seller.

Businesses should review:

• Whether marketplace sales count toward applicable economic nexus thresholds.

• Whether the platform collects and remits the required tax.

• Any remaining state registration or sales tax return requirements for the individual seller.

• Whether direct website sales create separate collection obligations.

• Whether physical locations or inventory create independent nexus.

For example, New York generally includes marketplace sales when evaluating its remote-seller economic nexus threshold.

Direct sales and marketplace sales should remain distinguishable in the company's reporting.

Sales Tax Nexus for Restaurants

Restaurants face additional sales tax considerations as they expand into new locations or selling channels.

Opening another restaurant can create physical nexus. Catering, online ordering, delivery, and sales across jurisdictions may require further review.

Restaurant operators should pay attention to:

• New locations: Confirm registration and local tax requirements before opening.

• Online orders: Review tax treatment based on the applicable transaction and delivery location.

• Catering and delivery: Determine the correct jurisdiction and sourcing rules.

• Taxable and exempt items: Configure menu categories according to applicable law.

• Local taxes: Account for additional city, county, or district requirements.

• POS configuration: Ensure taxable items and rates are mapped correctly.

• Delivery platforms: Verify marketplace facilitator responsibilities.

For restaurant franchises, responsibilities also depend on which legal entity operates each location.

A properly configured POS system supports collection accuracy, but it does not replace a legal or tax review.

Sales Tax Nexus for Franchise Businesses

Franchise systems can involve multiple legal entities operating in different states.

Franchisors and franchisees should evaluate their sales tax nexus obligations separately.

For franchisees, relevant factors include operating locations, employees, inventory, property, and online sales.

For franchisors, relevant activities may include company-owned locations, employees, inventory, property, and certain in-state training or support activities.

Multi-state expansion can also introduce new obligations for either party.

For example, a franchise brand with franchisees in several states does not automatically have the same sales tax obligations as every franchisee.

The answer depends on legal structure, contracts, operational activities, and applicable law.

Businesses using separate entities should document which entity owns each location, employs personnel, sells products, and maintains property.

Our multi-unit franchise accounting guide explains how to organize financial records across multiple locations.

Sales Tax Nexus for Multi-Location Businesses

Managing sales tax becomes more complicated when a company operates several locations.

Each opening may introduce different registration, collection, and reporting requirements.

A reliable multi-location system should include:

• State and location-specific registrations.

• Consistent centralized or decentralized tax procedures.

• POS and ecommerce tax mapping.

• Applicable state and local rates.

• Filing calendars for each jurisdiction.

• Separate or clearly tracked sales tax liability accounts.

• A tax registration review within every new-location onboarding process.

Centralized accounting can simplify oversight. However, it must still identify the correct legal entity, location, and jurisdiction for each transaction.

Worked Example: Expanding From One State to Three

Consider ABC Restaurant Group, a fictional business planning to expand.

The group operates four restaurants in State A. It opens another physical restaurant in State B and starts selling products online to customers in State C.

State A already requires ongoing sales tax management based on the group's existing operations.

State B introduces another physical location. The business should review registration, local taxes, and collection procedures before opening.

State C requires sales monitoring. The company should determine which transactions count toward the state's economic nexus threshold and when collection might become necessary.

Planning lesson: Nexus reviews should happen during expansion planning, not only at year-end.

This example is illustrative and does not represent actual state-specific rules or an industry benchmark.

How Sales Tax Nexus Affects Accounting

Sales tax nexus affects more than tax registration. It also changes how a business records and reconciles transactions.

Once a company collects sales tax, that amount generally represents a liability owed to the tax authority rather than business revenue.

Sales Tax Payable vs. Revenue

Consider an illustrative month in which a business records:

• Taxable sales: $10,000.

• Sales tax collected: $800.

• Total customer payments: $10,800.

The business should generally record $10,000 as revenue and $800 as sales tax payable, assuming no other adjustments.

Recording the full $10,800 as revenue would overstate sales and distort financial reporting.

The accounting system should also distinguish:

• POS and ecommerce sales by jurisdiction.

• Marketplace settlements and tax collected by platforms.

• Sales tax liabilities by state or location.

• Tax payments and adjustments.

• Refunds, exemptions, and relevant reconciliation differences.

These controls become especially important when locations use different POS systems or payment platforms.

Sales Tax Reconciliation at Month-End

A monthly sales tax reconciliation helps identify errors before returns are filed.

A practical process includes:

1. Compare taxable sales by jurisdiction against the underlying transaction reports.

2. Review sales tax collected for each state or location.

3. Reconcile POS and ecommerce reports with accounting entries.

4. Review marketplace transactions separately to prevent duplicate reporting.

5. Compare sales tax payable balances with calculated liabilities.

6. Match prepared or filed tax returns to supporting records.

7. Match remittances against payments and liability reductions.

8. Investigate differences and document corrections.

Businesses should retain supporting records and explain timing differences between sales, filings, and payments.

A consistent month-end process helps management identify issues before they accumulate.

Common Sales Tax Nexus Mistakes

Businesses operating across states should avoid these common errors:

• Assuming physical presence is always necessary.

• Applying one economic nexus threshold nationwide.

• Using outdated state thresholds.

• Ignoring marketplace transactions in relevant threshold calculations.

• Confusing nexus with transaction taxability.

• Treating sales tax nexus as income tax or franchise tax nexus.

• Opening locations without reviewing registrations.

• Collecting tax before configuring the correct jurisdictions.

• Failing to reconcile tax collected with filed returns.

• Assuming marketplaces handle every sales tax responsibility.

• Failing to monitor nexus as remote sales increase.

Many of these mistakes result from disconnected systems or treating sales tax compliance as a year-end activity.

Regular monitoring and clear responsibilities can reduce those risks.

Sales Tax Nexus Checklist Before Expanding Into a New State

Use this checklist before beginning operations or selling into another state.

• Will the business open a physical location?

• Will employees work in the state?

• Will the business maintain inventory or property there?

• Will it make remote sales to customers in the state?

• Could its sales exceed the economic nexus threshold?

• Will it sell through online marketplaces?

• Are its products or services taxable?

• Is state sales tax registration required?

• Are additional local registrations necessary?

• Is the collection system configured correctly?

• Has a filing calendar been established?

• Are appropriate sales tax liability accounts in place?

• Is the reconciliation process documented?

Review the checklist again when business activities or state requirements change.

QMK Consulting Insight

For multi-state businesses, sales tax nexus should be treated as an ongoing operational responsibility rather than a question addressed only when tax returns are due.

New employees, additional locations, changing inventory arrangements, online sales, and rising transaction volumes can change a company's obligations.

A practical approach is to make nexus monitoring part of expansion planning and monthly financial controls.

This means reviewing potential tax obligations before opening a location and maintaining accurate sales records by jurisdiction afterward.

For multi-location businesses, the goal is to connect sales activity, accounting records, tax registrations, and filing responsibilities in one reliable process.

How QMK Consulting Supports Multi-State Sales-Tax Compliance

QMK Consulting helps businesses manage the accounting and tax responsibilities associated with operating across multiple jurisdictions.

Depending on the engagement, support may include:

• Sales tax nexus reviews.

• Sales and use tax compliance.

• Multi-state registration assistance.

• Multi-state sales tax filing.

• Sales tax accounting and liability tracking.

• POS and accounting reconciliations.

• State and local compliance support.

• Tax considerations during business expansion.

For restaurant groups, franchise operators, and growing businesses, accurate records and proactive planning are essential to managing these obligations.

Expanding Into New States? Review Your Sales-Tax Exposure Before Filing Deadlines Arrive.

Before opening another location or increasing remote sales, make sure your tax registrations, collection systems, and accounting records reflect your operations.

Explore QMK Consulting's sales tax nexus and state-local tax compliance services to learn how our tax preparation and planning team can support your multi-state business.

Frequently Asked Questions

What is sales tax nexus?

Sales tax nexus is a business connection with a state that may create obligations to register, collect, and remit sales or use tax on taxable transactions.

What creates sales tax nexus?

Physical locations, employees, inventory, business property, certain in-state activities, and reaching applicable economic nexus thresholds can create sales tax nexus.

What is economic nexus?

Economic nexus is a connection based on qualifying economic activity, usually sales into a state. It can establish collection obligations without physical presence.

What is physical nexus?

Physical nexus generally results from a business's physical activities, personnel, or property within a state, such as stores, warehouses, employees, or inventory.

Can I have sales tax nexus without a physical location?

Yes. Economic nexus laws can require qualifying remote sellers to collect sales tax even when they have no physical location in the state.

Is there one economic nexus threshold for every state?

No. States use different dollar thresholds, measurement periods, sales definitions, and, in some cases, transaction-count requirements.

Does selling online create sales tax nexus?

It can. Online sales may establish economic nexus once the applicable state threshold is reached. Inventory or other physical activities can also create nexus independently.

Are Marketplace Transactions Included When Measuring Economic Nexus?

That depends on the state. Some jurisdictions include sales completed through marketplaces when determining whether sellers have reached economic nexus thresholds. Others exclude certain marketplace transactions or apply additional conditions.

Does a marketplace handle all sales-tax obligations?

Not necessarily. A marketplace may collect and remit tax on facilitated transactions, but sellers can retain registration, reporting, or collection responsibilities for other sales.

Is sales tax nexus the same as income tax nexus?

No. Sales tax nexus and income tax nexus follow different legal standards. A business should evaluate its obligations for each tax separately.

Is sales tax nexus the same as franchise tax?

No. Sales tax nexus concerns sales and use tax obligations. Franchise tax is a separate state business tax with its own rules.

What happens after a business establishes nexus?

The business should review registration requirements, transaction taxability, applicable rates, collection systems, filing obligations, remittances, and accounting reconciliations.

When Should a Business Operating in Several States Recheck Its Nexus Exposure?

A company should monitor nexus as its sales and activities change, particularly when expanding into new markets. Reviews during financial closes and before opening new locations can help identify potential obligations. The review schedule should also reflect each state's measurement periods and any changes in business operations.