What Are Click-Through Nexus Laws?
Click-through nexus laws represent one of the most significant developments in sales tax nexus by state legislation since the landmark Wayfair decision. These laws create sales tax obligations for online retailers who work with in-state affiliates or referral partners, even when the business has no physical presence in that state.
Understanding click-through nexus laws is essential for any ecommerce business using affiliate marketing programs. When an out-of-state seller compensates a state resident for referring customers through web links, many states now consider this activity sufficient to establish sales tax nexus. This expanded definition of nexus has caught many online retailers off guard, resulting in unexpected compliance obligations and potential liability.
How Click-Through Nexus Differs from Physical and Economic Nexus
Traditional economic nexus thresholds focus on sales volume or transaction counts, while physical nexus requires warehouses, offices, or employees in a state. Click-through nexus takes a different approach by targeting the relationship between out-of-state sellers and in-state affiliates.
For businesses navigating Wayfair sales tax compliance, understanding all three nexus types is crucial. While economic nexus has received significant attention post-Wayfair, click-through nexus laws continue to expand across the country, creating additional compliance layers for remote sellers.
States with Active Click-Through Nexus Laws
As of 2026, approximately 21 states have enacted click-through nexus legislation. These include major markets like New York, Illinois, North Carolina, and Pennsylvania. Each state sets different thresholds for when these laws apply, typically based on annual sales generated through in-state referrals.
New York pioneered click-through nexus in 2008, establishing the framework that other states would follow. The so-called “Amazon Tax” legislation required out-of-state retailers to collect sales tax when they paid commissions to New York-based website operators who referred customers through clickable links.
For comprehensive state-specific guidance, our state guides section provides detailed breakdowns of click-through requirements across all jurisdictions.
Affiliate Nexus Explained: The Business Impact
Affiliate nexus explained simply means that your relationship with in-state referral partners can trigger tax collection obligations. This affects businesses using:
- Coupon and deal websites
- Bloggers and content creators
- Comparison shopping sites
- Social media influencers
- Referral reward programs
- Email marketing partners
- Cashback and loyalty sites
Companies like Abaca Tax specialize in helping businesses evaluate their affiliate relationships and determine where click-through nexus obligations exist. Professional evaluation is especially important because the rules vary significantly between states.
Remote Seller Sales Tax Obligations Under Click-Through Rules
Your remote seller sales tax obligations extend beyond traditional economic nexus thresholds when click-through laws are in effect. Even businesses below standard economic thresholds may need to register and collect sales tax if they maintain active affiliate programs with state residents.
This creates a complex compliance landscape where a small business with modest sales might still have multi-state obligations due to affiliate relationships. For businesses questioning their compliance status, our guide on remote seller collection requirements provides clarity on when these obligations apply.
Calculating Your Click-Through Nexus Exposure
To assess your risk under click-through nexus laws:
Step 1: Audit Your Affiliate Relationships
Review all partners who receive compensation for customer referrals. Document their locations and the commission structure you maintain with each partner. Even informal referral arrangements can create nexus exposure in some states.
Step 2: Track Sales by Referral Source
Analyze your sales data to determine how much revenue each affiliate generates. Most states with click-through nexus have minimum thresholds before the law applies, but these thresholds vary widely.
Step 3: Monitor State Legislation Changes
Click-through nexus laws continue evolving, with new states adopting legislation regularly. Working with sales tax professionals like States Sales Tax helps ensure you stay current with changing requirements.
Compliance Strategies for Affiliate Marketing Programs
Option 1: Collect Sales Tax in Affected States
The most straightforward approach is registering and collecting sales tax in states where click-through nexus applies. This provides full compliance but requires ongoing administrative work and monitoring.
Option 2: Modify Affiliate Program Structure
Some businesses restructure affiliate relationships to avoid nexus triggers. This might involve working only with out-of-state affiliates or adjusting compensation models. However, consult a tax professional before making structural changes, as states may still assert nexus based on economic substance.
Option 3: Use Marketplace Facilitators
For marketplace sellers, understanding ecommerce sales tax compliance includes knowing when platforms collect tax on your behalf versus when you remain responsible.
Documentation and Record-Keeping Requirements
States with click-through nexus laws require specific documentation to prove compliance. Maintain records of:
- Affiliate agreements and commission structures
- Sales generated through each affiliate by state
- Dates when affiliate relationships began
- Copies of sales tax registration certificates
- Communication with affiliates regarding their locations
Should you face an audit, proper documentation is your best defense. Our sales tax audit defense guide provides comprehensive strategies for protecting your business.
Common Mistakes to Avoid
Many businesses make costly errors regarding click-through nexus:
Assuming Small Sales Volume Protects You: While many states have thresholds, some do not. Even modest affiliate-generated sales can trigger obligations.
Ignoring Coupon Sites: Promotions through deal websites often create nexus even if you do not directly pay the site owner.
Failing to Monitor Expanding Laws: New states adopt click-through nexus regularly. What was compliant last year may not be this year.
Not Tracking Affiliate Locations: Many businesses know they have affiliates but do not track where those affiliates are located, making nexus determination impossible.
When to Seek Professional Help
Navigating click-through nexus becomes complex when you have affiliates in multiple states or significant referral-generated revenue. Professional sales tax consulting services can provide clarity and peace of mind.
For California-specific requirements, review our detailed California sales tax guide, which covers both click-through and economic nexus rules.
Conclusion: Staying Ahead of Click-Through Nexus Requirements
Click-through nexus laws add complexity to remote seller compliance, but understanding your obligations is the first step toward proper management. By auditing your affiliate relationships, tracking sales by referral source, and staying current with state legislation, you can navigate these requirements effectively.
For Texas businesses, our Texas sales tax guide provides state-specific guidance on click-through and other nexus types.
Remember, the cost of compliance is always lower than the cost of penalties and back taxes. If you are uncertain about your click-through nexus status, consulting with sales tax professionals can prevent costly mistakes and provide a clear compliance roadmap.
The landscape of sales tax nexus by state continues evolving. Businesses that proactively manage their affiliate relationships and monitor state requirements will be best positioned for long-term compliance success in 2026 and beyond. Stay informed, document your activities, and seek professional guidance when needed to ensure your business remains compliant with all applicable click-through nexus laws.