File NR6 Before the First Payment

Submit Form NR6 to CRA before the first rental payment of the year so withholding tax is calculated on net rental income instead of gross rent. Without an approved NR6, your withholding agent must remit 25% of gross rent under Part XIII. Filing NR6 on time reduces the non-resident withholding tax by thousands annually since deductions for mortgage interest, property tax, and management fees are factored in.

Remit Withholding Tax by the 15th

Canadian withholding agents must remit 25% Part XIII withholding tax to CRA by the 15th of the month following each payment to a non-resident. Late withholding tax remittances trigger penalties of 3% for one to three days late, scaling up to 10% plus compound interest. Setting up automated monthly withholding tax remittances eliminates this risk entirely.

File NR4 Slips by March 31

Every NR4 slip and NR4 summary must be filed with CRA and delivered to the non-resident recipient by March 31 following the calendar year. Late NR4 filing penalties start at $100 and can reach $2,500 per slip for repeated failures. Preparing your NR4 slips early ensures withholding tax amounts match remittances and avoids costly NR4 penalties.

Apply Treaty-Reduced Withholding Rates

Canada has tax treaties with over 90 countries that may reduce the standard 25% withholding tax rate on NR4-reported payments — dividends, interest, royalties, and management fees. Your NR4 slip must report the correct treaty-reduced withholding tax rate and the recipient's country code. Applying the treaty rate on your NR4 saves the non-resident significant withholding tax that would otherwise require a refund claim.

Coordinate NR6 with Section 216

An approved NR6 reduces withholding tax to net rental income, but the non-resident must still file a Section 216 return by June 30 to report actual net rental income for the year. Missing the Section 216 deadline after filing NR6 means CRA reassesses withholding tax on gross rent retroactively. Your NR6 and Section 216 filings must work together to maintain the reduced withholding tax benefit.

Report Correct NR4 Income Codes

Each NR4 slip requires a specific income type code — Code 12 for rental income, Code 11 for dividends, Code 29 for management fees. Using the wrong NR4 income code triggers CRA matching errors and reassessment notices. Accurate NR4 coding ensures the non-resident's withholding tax credit matches what CRA has on file and prevents processing delays on refund claims.

Track Agent Liability Carefully

If you are the Canadian withholding agent — property manager, tenant paying rent directly, or corporate payer — you are personally liable for unremitted withholding tax under ITA section 215. CRA can assess the withholding agent directly for the 25% tax plus penalties and interest. Proper NR4 and withholding tax tracking protects agents from personal liability on non-resident payments.

Amend NR4 Errors Immediately

If you discover an error on a filed NR4 slip — wrong withholding tax amount, incorrect recipient address, or missing country code — file an amended NR4 with CRA immediately. Unresolved NR4 errors create mismatches in CRA's system that trigger withholding tax reassessments against the payer. Correcting NR4 slips proactively avoids compounding penalties and interest on the discrepancy.

Separate NR4 by Income Type

If you make multiple types of payments to the same non-resident — rental income, management fees, and interest — issue separate NR4 slips for each income type with the correct withholding tax rate applied individually. Combining different income types on a single NR4 slip causes CRA processing errors and may result in the highest 25% withholding tax rate being applied to all amounts.

Reconcile NR4 to Remittances Annually

Before filing your NR4 summary, reconcile the total withholding tax reported on all NR4 slips against actual remittances made to CRA throughout the year. Any shortfall between NR4-reported withholding tax and amounts remitted results in a balance owing with compound interest from each missed monthly deadline. Annual NR4 reconciliation catches discrepancies before CRA does.