If you are filing for the first time, you might have to print & mail your return to CRA. CRA will not accept an electronic filing if they do not have anything for you on their record.

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Thank you very much. But if I sent it yesterday, may I send it by mail too?

If you were able to send it with NETFILE no need to send by mail too. Keep your NETFILE confirmation number for reference until you receive your Notice of assessment from CRA.

Thank you for choosing TurboTax.