What Is Click-Through Nexus and Who Does It Affect?

Click-through nexus is a state sales-tax nexus rule that can apply when an out-of-state seller compensates a resident publisher, affiliate, or representative for referring customers. A tracked website link is a common example, but the analysis is not necessarily limited to internet links. The important questions are where the referring party is located, how that party is compensated, whether its conduct amounts to solicitation under the applicable state law, and how much revenue the arrangement generates.

There is no single nationwide click-through threshold. New York and Vermont, for example, use separately enacted rules and different measurement periods, while California draws a specific distinction between passive advertising and solicitation. Each state must therefore be analyzed independently. If an arrangement creates a registration obligation, the seller can review the appropriate sales tax application requirements for that jurisdiction.

Scenario 1: You Pay a State Resident for Referred Sales

This is the central situation addressed by click-through nexus laws. Imagine an online retailer located outside a state. A blogger who lives in that state publishes a link to the retailer’s website and earns a commission when a visitor makes a purchase. Depending on the state’s law, that relationship may support a presumption that the retailer is soliciting business in the state through a resident representative.

New York provides a concrete example. Its law presumes that a seller solicits business through a representative when the seller compensates a New York resident for directly or indirectly referring potential customers, whether through an internet link or otherwise. The rule applies to qualifying referral agreements involving sellers of taxable tangible personal property or services.

For New York click-through nexus, the presumption applies when cumulative gross receipts from New York sales generated by all qualifying resident referrals exceed $10,000 during the preceding four sales-tax quarters ending in February, May, August, and November. This calculation concerns sales generated by qualifying referrals; it is not New York’s separate economic-nexus threshold.

Vermont also has a resident-referral rule, but its measurement period is different. Vermont presumes solicitation through a representative when a taxable seller compensates a Vermont resident for referrals, including internet links, and referred Vermont sales exceed $10,000 during the preceding tax year.

These examples demonstrate why a business should not copy one state’s calculation into another state’s analysis. Review each state in which a compensated referring party resides, identify the sales connected to all qualifying resident referrals, and apply that state’s definitions and measurement period.

Scenario 2: You Buy Ads but Do Not Have an Active Affiliate

A business may worry that every advertisement viewed in a state creates click-through nexus. That conclusion is too broad. The legal treatment can depend on whether the arrangement is merely advertising or involves a resident who actively solicits customers for the seller.

California’s affiliate-nexus guidance states that anonymous, passive online advertising—such as banner ads, click-through ads, cost-per-action ads, and ordinary website links—is not solicitation by itself. Additional in-state solicitation can change the result. This distinction is specific to California’s affiliate-nexus provisions and should not be treated as a universal rule for every state.

When reviewing an advertising arrangement, consider what the in-state party actually does. A publisher that simply displays an advertisement presents a different set of facts from a representative who contacts prospective buyers, distributes promotional material, makes recommendations, or otherwise participates in sales-producing activity. Contract labels such as “advertiser,” “publisher,” or “marketing partner” do not resolve the practical question of what conduct occurs.

The compensation method also deserves attention. A flat payment for ad space, payment for clicks, and a commission tied to completed sales can present different facts under a state’s rules. Sellers deciding whether an arrangement is only advertising can find a fuller discussion in Does Advertising in a State Create Sales Tax Nexus?

Scenario 3: Your Referred Sales Are Below a Click-Through Threshold

Being below a particular click-through threshold does not, by itself, establish that the seller lacks sales-tax nexus. Click-through nexus is only one possible basis for a state obligation. The same seller may have physical presence, an employee or other representative in the state, a related-party or affiliate connection, marketplace activity, or enough direct sales to satisfy a separately applicable economic-nexus rule.

For example, a seller may have only modest sales from resident affiliate links but substantial sales to customers reached through other channels. The click-through calculation may not capture those other sales, while an economic-nexus test may use a broader measure. Conversely, a click-through law may focus specifically on sales generated through qualifying resident referrals. The calculations should not be merged unless the applicable state rules require that treatment.

Use separate review tracks:

• Click-through nexus: Identify compensated resident referrers, evaluate their activities, and measure qualifying referred sales under the state’s rule.
• Economic nexus: Compare the seller’s relevant statewide sales activity with the independently enacted economic-nexus standard.
• Physical or representative presence: Review offices, inventory, employees, contractors, and other in-state business activity.
• Marketplace activity: Determine how marketplace-facilitator rules affect collection obligations without assuming they eliminate every responsibility of the seller.

Because economic-nexus standards are state-specific, sellers should not substitute a familiar figure from one jurisdiction for another. See how economic nexus thresholds differ between states for the broader multistate framework.

Scenario 4: You Believe the Resident Did Not Solicit Customers

Some state click-through laws create a presumption rather than an irrebuttable conclusion. That distinction matters. Once the statutory conditions are met, the seller may be treated as soliciting in the state unless it can establish the facts required to rebut the presumption.

In New York, a seller subject to the click-through presumption may rebut it by proving that the resident did not perform in-state solicitation satisfying the U.S. Constitution’s nexus requirement during the relevant four quarters. The rebuttal is not automatic. Vermont similarly permits rebuttal with proof that the resident did not conduct in-state solicitation satisfying federal constitutional nexus standards during the tax year.

A seller considering a rebuttal should preserve records that describe the relationship rather than relying only on the agreement’s title. Useful materials may include executed contracts, compensation reports, lists of resident partners, link or referral records, communications describing permitted marketing activities, and documentation showing how referred sales were identified. The purpose is to create a consistent factual record of what the resident did, where the activity occurred, and which sales resulted from it.

Contract restrictions can help explain the intended relationship, but the parties’ actual conduct remains important. If a contract describes passive link placement while emails or campaign records show active customer outreach, the seller should not assume the contractual wording settles the question.

How to Decide Whether Registration Is Required

Start with a state-by-state map of every compensated publisher, affiliate, or representative. For each state, identify the governing period, total the sales attributable to all potentially qualifying resident referrals, and document the resident’s actual promotional conduct. Then perform separate economic, physical-presence, affiliate, employee, and marketplace reviews.

A practical decision sequence is:

1. Locate the referring parties. Determine their states of residence or operation instead of looking only at customer locations.
2. Review the agreement and activity. Identify whether compensation is tied to referrals and whether the resident performs more than passive advertising.
3. Measure the correct sales. Use the state’s required period and determine whether its rule measures referred sales rather than all sales.
4. Consider any rebuttal provision. If a presumption applies, determine what proof the state requires and whether the business’s records support that position.
5. Check other nexus grounds independently. A negative click-through result does not end the analysis.
6. Address registration before taxable sales begin when required. Follow the particular state’s registration timing and administrative requirements.

New York illustrates the significance of the last step. A person required to register as a New York sales-tax vendor—including a seller whose click-through arrangements establish vendor status—must register with the New York State Department of Taxation and Finance through New York Business Express and obtain a sales-tax Certificate of Authority before beginning business.

Click-through nexus principally affects sellers that compensate residents of a taxing state for sales-producing referrals. It can also matter to resident publishers, affiliates, and representatives because their activities may be used to establish the seller’s nexus. The sound approach is to classify the relationship based on actual conduct, calculate referred sales under the correct state-specific period, and keep the click-through review separate from every other potential basis for nexus.