E-Commerce & Marketplace Sales Tax Consulting
Sales tax consulting for e-commerce and marketplace sellers. We help Amazon, Shopify, Etsy, Walmart, eBay, and international sellers with nexus, registration, compliance, and audit defense.
Sales Tax Consulting for E-Commerce & Marketplace Sellers
E-commerce has opened the door for businesses to reach customers nationwide — but it has also created complex sales tax obligations. Since the 2018 Wayfair decision, states aggressively enforce economic nexus thresholds, requiring online sellers to register, collect, and file sales tax in dozens of states.
At SalesTaxDefenseUSA, we help domestic and international online retailers, including those using Amazon, Shopify, Etsy, Walmart, and eBay navigate U.S. sales tax rules, stay compliant, and avoid costly audits.
Common Sales Tax Challenges for E-Commerce Sellers
Crossing thresholds ($100,000 in sales or 200+ transactions) triggers obligations in multiple states.
Platforms like Amazon collect tax in many states, but sellers may still need to file zero-dollar returns.
Canadian, European, and Asian businesses often don’t realize they must register once nexus is met.
Digital goods, bundled products, and subscription boxes are taxed differently across states.
States actively target e-commerce for underreporting or failure to register.
Our Process for E-Commerce Businesses
State Spotlights
California — $500,000 threshold; frequent audits targeting Shopify and Amazon sellers.
New York — Aggressive enforcement; requires zero-dollar returns from marketplace sellers.
Texas — $500,000 threshold; multiple local rates complicate compliance.
(Note: thresholds and rules change; always confirm current requirements.)
Marketplace → Seller Responsibilities
Even when platforms collect sales tax, sellers are rarely “off the hook.” States still expect:
- Registration — Many states require sellers to be registered even if platforms collect.
- Zero-Dollar Returns — Returns often must be filed, showing tax collected by facilitators.
- Notice Response — States issue compliance notices if returns are missing, even with marketplace collection.
- Recordkeeping — Sellers must maintain transaction-level data for audits.
- Resale Documentation — Exemption certificates for wholesale sales must still be managed.
Audit Triggers for E-Commerce Sellers
- Reporting sales under $100,000 but later exceeding thresholds.
- Failing to register in multiple states despite economic nexus.
- Not filing zero-dollar returns when marketplaces already collected tax.
- Poor recordkeeping across platforms.
- International sellers shipping into the U.S. without registration.
Examples of the Work We Handle
Example 1: Amazon Marketplace Seller
A seller with FBA inventory in 12 states needed to register and file. We built a compliance schedule and avoided penalties for late filings.
Example 2: Shopify E-Commerce Store
A direct-to-consumer brand hit $150,000 in sales in Texas and California. We registered them, filed retroactive returns, and prevented an audit.
Example 3: International Seller Entering U.S. Market
A European e-commerce company began selling into multiple U.S. states. We identified nexus exposure, pursued VDAs, and brought them into compliance.
Not always. You only need to register in states where you cross nexus thresholds.
Yes, but you may still need to file returns (often zero-dollar) in states where the marketplace collected.
Yes. International sellers with U.S. customers must register and file once thresholds are met.
States cross-check marketplace data, payment processors, and shipping records to identify unregistered sellers.
In many states, yes. Digital downloads, SaaS, and subscription boxes often face unique taxability rules.
States can assess penalties, interest, and issue estimated assessments that exceed your actual liability.