To enter the NR4,
treat it as if it is a SSA-1099 and enter it in the Retirement Plans and Social
Security section, under ‘Social Security (SSA-1099, RRB-1099)’.
Then, go to the
Deductions and Credits section and select Foreign Taxes under ‘Estimates and
Other Taxes Paid’ to enter any foreign tax you already paid to Canada on
that income.
For more info
specific to the US/Canadian tax treaty, please see http://www.irs.gov/pub/irs-pdf/p597.pdf
