Follow the steps to fill out the form online effectively.

1. Click ‘Get Form’ button to obtain the form and open it in a suitable editor.
2. In Part A, provide the identification details of the operator. Include the operator's name, business number, contact person, title, and telephone number.
3. In Part B, fill in the identification of co-venturer. Enter the co-venturer's name and, if applicable, their business number. Complete the mailing address if not registered for GST/HST.
4. In Part C, identify the joint venture. Enter the name of the joint venture and describe the activities related to it.
5. In Part D, indicate your election by confirming that the operator and co-venturer(s) intend for the operator to account for GST/HST on joint venture activities. Specify the effective date of this election.
6. If revoking a previous election, fill out Part E with the effective date of revocation.
7. Part F requires a certification by the operator, confirming the accuracy of the information provided. Include the name, title, and signature of the authorized person.
8. In Part G, the co-venturer must certify their information, providing their name, title, and signature.
9. Ensure all parts are completed and double-check for accuracy, ensuring all necessary signatures are obtained.
10. Once completed, you can save changes, download, print, or share the form as needed, keeping a copy for your records.

Start filling out your Canada GST21E form online today!