How to apply correct sales tax rates based on customer location e-commerce?

To apply correct sales tax rates based on customer location in ecommerce, use a tax automation tool that geo-locates the customer's shipping address and applies the right state, county, and city rates at checkout. Shopify Tax, Avalara, and TaxJar all provide this functionality for US sales. Swap handles the equivalent for cross-border customers: calculating the right VAT, GST, and duty by destination country.