Thank you for that information - TTD doesn't support the T1159 Income Tax Return for Electing Under Section 216. If you are non-residents, and only have a T776, then it might be possible to paper-file a printed version of the T1 in TTD. You would need to indicate clearly on Page 1 that it is an "Income Tax Return for Electing under Section 216". Indicate they are a non-resident, and complete the T776 and attach it to the return. If you have an NR4 with tax withheld (25%?) it would go in box 437. You would also need to attach the slip.
To make it easier you can fill out the T776 in TTD as mentioned above. Print out a T1159 from the CRA site and just fill in the applicable line numbers from the TTD T1. Here is the T1159.
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