Are you filing for the first time? If not, make sure to answer No to the question under Mandatory Question. "Is this your first tax return being filed with the CRA?
If you have a NAC (Netfile Access Code), try removing it; it is not mandatory.
Make sure to check your personal information, likea address & name; Ensure your name matches your last Notice of Assessment (NOA) exactly.
Another thing to keep in mind is that today is the first day of Netfiling, and the CRA servers are busy. If everything is correct on your return as stated above, I recommend that you wait and try again later.
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