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How do I handle sales tax if I sell products across multiple states or countries?

Sales Tax Nexus Guide for Small Businesses

Understanding where you must collect and remit sales tax is crucial for compliance. Nexus rules determine your tax obligations based on physical presence, economic activity, and where your customers are located. This table breaks down everything clearly and simply.

 

Section Details
1. Understanding Nexus You must collect sales tax only in states/countries where you have nexus.

A. Physical Nexus
Triggered when you have:
• Office or storefront
• Employees or contractors
• Inventory stored (including Amazon FBA)
• Booth at fairs or markets
→ If any apply, you must collect sales tax in that state.

B. Economic Nexus
Triggered by sales volume or transaction count.
Common thresholds:
• $100,000 in sales OR
• 200 transactions
Thresholds vary by state, especially after the Wayfair ruling.
→ Crossing the threshold means you must register, collect & remit.
2. How to Check Nexus Step-by-step process:
1. List all states where you sell.
2. Review yearly revenue + transaction count per state.
3. Compare with threshold requirements.
4. Track monthly so you know when you’re close.Most small businesses begin by collecting sales tax only in their home state.
3. How to Collect Sales Tax Online stores (Shopify, Amazon, Etsy, WooCommerce)
• Platforms calculate tax automatically.
• You must select the states where you are registered.Manual invoicing
• Add sales tax based on customer’s shipping address.
• Charge tax ONLY where you have nexus.
4. Selling Internationally A. European Union
May require:
• VAT number
• IOSS registration
Ecommerce platforms handle VAT automatically if set correctly.B. United Kingdom
• VAT registration may be required based on sales volume.

C. Canada
• GST/HST may apply if economic thresholds are crossed.

In most countries:
→ Digital products often require VAT at low levels.
→ Physical goods usually have thresholds.
5. Tools to Simplify Sales Tax • TaxJar – Best for beginners; monitors thresholds + autofiles.
• Avalara – Great for advanced and international compliance.
• Shopify Tax – Easy for Shopify sellers.These handle:
✔ Calculations
✔ Nexus alerts
✔ Tax return filings
6. Filing Requirements (U.S.) If you collect sales tax in a state, you must:
1. Register with that state’s Department of Revenue
2. File returns monthly, quarterly, or annually
3. Remit collected taxEven with $0 collected → You still must file a zero return.
7. Common Mistakes  Charging tax where you aren’t registered
Forgetting Amazon FBA creates nexus
Not tracking economic thresholds
Not filing zero returns
Assuming all products are taxable
Quick Action Summary Task → What to Do
Determine nexus → Check physical + economic rules
Register → Don’t collect tax before registering
Enable tax rules → Configure your ecommerce platform
Track thresholds → Monitor monthly
File & remit → Use reminders or TaxJar

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