For freelancers operating in North America, understanding the nuances of cross-border tax compliance is essential. In the United States, sales tax is largely determined by physical or economic nexus at the state level. If you are a digital service provider, many states exempt your services, but software-as-a-service (SaaS) and digital products are increasingly becoming taxable.
Conversely, Canada relies on a federal Goods and Services Tax (GST), which is often combined with provincial taxes (HST/PST). If you are a Canadian freelancer billing a US client, the service is typically considered a "zero-rated" export, meaning you charge 0% GST. However, if you are a US freelancer selling into Canada, exceeding the CAD 30,000 small supplier threshold may require you to register and collect Canadian GST. Always consult a cross-border CPA to structure your invoices correctly and avoid penalties.