Technical Support Online Forms | Legal Guides | Tech Support Canadian Import Tariffs back to Technical Support We are pleased to provide the following documents for download in a "PDF" format which when downloaded can be opened and printed with Adobe Reader. If this is not available on your computer, the following Adobe site provides a free download of the program. The following forms are available for reproduction. We also have provided sample forms showing the correct method of completion. Canada Customs Invoice - Blank Canada Customs Invoice - Completed Sample NAFTA Certificate - Blank NAFTA Certificate - Completed Sample