On a Section 216 return, the total non-resident tax withheld is claimed on line 43700 of Form T1159.  To file a Section 216 return, you must use the information from your NR4 slip: 

• You report the gross income from Box 16 and claim the tax withheld from Box 17 on Line 43700 of the T1159 return.

In TurboTax Online:

• Rental Income: Navigate to the Rental Income & Expenses section (Form T776) to enter your gross income and expenses.
• Inputting the Withholding: Since TurboTax may not have a dedicated NR4 box for Section 216 in the same way it does for residents, you may need to enter the tax withheld from Box 17 of your NR4 slip into the "Tax Withheld" field often found in the T4A or Investment Income sections, or directly on the summary page for non-resident taxes if using a specific non-resident version of the software. 

Thank you for choosing TurboTax.