Yes, you will need to complete your Canadian income tax return and because you own US rental property -You must file a U.S. tax return if you have not had non-resident tax withheld. If you do not file the tax return within the specified time period, the IRS will disallow all deductible expenses as well as any related loss carryovers. In addition, the I.R.S. will assess penalties for late filing and underpayment of tax.