Nex Sales Tax Nexus

The problem

Managing US sales tax compliance across multiple jurisdictions is a logistical nightmare for e-commerce sellers. Keeping track of shifting economic nexus thresholds, marketplace facilitator rules, and physical footprint triggers leads to expensive penalties and audit exposure.

What it does

• Evaluates economic and physical nexus across all US states, including marketplace warehouse footprints like FBA.
• Generates state-specific threshold reference tables updated with the latest June 2026 transaction and revenue rules.
• Produces registration checklists and handles voluntary disclosure agreement (VDA) prioritization for historical exposure.
• Standardizes exemption certificate management for wholesale and B2B sales using MTC and SST forms.
• Determines specific registration duties for marketplace-only sellers versus mixed-channel operators.

Frameworks & tools

Supports Shopify, Amazon FBA, eBay, Walmart, and Etsy sellers. Incorporates data from Streamlined Sales Tax (SST) and state Department of Revenue sources.

Why this beats prompting it yourself

General LLMs often hallucinate tax thresholds or use outdated pre-Wayfair logic. This skill enforces a rigorous physical-then-economic evaluation layer and bakes mandatory verification steps into every workflow to ensure audit-proof documentation.

Use cases

• Assess whether a Shopify store has crossed the $100,000 threshold in a specific state.
• Create a registration roadmap for a seller expanding into states with $500,000 thresholds like CA or TX.
• Validate resale certificates for a wholesale distributor selling to tax-exempt entities.
• Review tax obligations for non-US sellers shipping inventory to US-based warehouses.

Known limitations

Does not provide legal or tax advice. Does not calculate income or franchise tax nexus. Requires manual verification against state DOR sites for the most current rule changes.