This info does not show up on the return when you print it. I assume you are referring to an immigration return and not a departure return? You are unable to efile a departure return, but can efile an immigration return. I don't believe CRA gets this field when you efile an immigration return. They will however get the date of entry to Canada field, which they use to prorate the basic exemption based on the number of days of their residency in Canada during the year.
On the departure return, CRA uses the date of departure on the 1st page of the tax return to calculate the basic exemption. If no proration of the exemption is required based on their foreign source non-resident income (i.e. they had no foreign non-resident income after they departed Canada), they would be able to claim the full basic exemption and it would not need to be prorated on their departure return. However, you must manually send in a statement of worldwide income (similar to Schedule A on a non-resident return) with the return, to provide them with the clients non-resident income for purposes of this calculation. Otherwise, they will prorate the exemption based on the date of their departure.
If no proration is required for the basic exemption for the immigration return (i.e. they did not have any income before coming to Canada), I recommend mailing in a similar statement of worldwide income for the immigration return as well to be on the safe side. They need to have this info on file to support the calculation.
If on the other hand, they had enough foreign income before coming to Canada to required the exemption be prorated based on their number of days in Canada, I would not bother mailing a statement in, as they will have all the info they need with the date of entry to calculate this correctly.
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