In some self-employment tax forms, like T2125, business number should be 15 letters GST account number, like 123456789RC0001. If you don't have a GST account number, please leave the field empty if the field is only optional for the form.
- What's Document Control Number (DCN)?
- Why some line numbers are missing in the tax form?
- Why T4A(P) slip complains number of month is missing?
- How to unlock "My Account"?
- How to proceed if my spouse doesn't have SIN number?
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