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The tax treaty, withholding, and forms

The Canada-US tax treaty in practice: W-8BEN, W-9, NR301, NR4, Form 1042-S, Form 8833, ITINs, Form 1040-NR, residency certificates, and recovering tax withheld at source.

19 guides, each written by a CPA licensed in the US and Canada.

Cross-Border

Both Countries Auditing the Same Income: What Happens and Who Goes First

The CRA and the IRS exchange information under Article XXVII of the Canada-US tax treaty, and an audit in one country can trigger an audit.

Aug 27, 2026
Cross-Border

Competent Authority and the Mutual Agreement Procedure (US-Canada Treaty)

When both countries tax the same income and the treaty does not fix it. But some disputes cannot be resolved that way. Covers key rules, filing.

Aug 27, 2026
Cross-Border

Cross-Border Interest Income: Canada-US Treaty and Withholding

This is different from dividends (15% treaty rate) and a significant planning point for cross-border investors. Covers treaty provisions, foreign tax.

Aug 30, 2026
Cross-Border

Does Canada Have a Tax Treaty with the US? What It Covers and Why It Matters

The Canada-US tax treaty prevents double taxation by setting which country taxes each type of cross-border income and reducing withholding rates.

Aug 24, 2026
Cross-Border

Form 1040-NR Guide for Canadians with US Income: When You Must File and What to Report

A Canadian resident who earns US-source income may need to file Form 1040-NR with the IRS.

Sep 4, 2026
Cross-Border

Form 1040-NR: When Canadians Need to File a US Non-Resident Return

Getting this wrong in either direction (filing when you do not need to, or not filing when you do) creates problems on both the US and Canadian side.

Aug 30, 2026
Cross-Border

Form 1042-S: Getting Back Over-Withheld US Tax as a Canadian

If a US payor withheld 30% on your income when the treaty rate was lower (or zero), you file a US return to get the difference back.

Aug 30, 2026
Cross-Border

Form 8233: Claiming a Treaty-Based Withholding Exemption on US Income

Form 8233 lets a non-resident alien claim a treaty-based withholding exemption on compensation or independent personal services income.

Aug 30, 2026
Cross-Border

How to Apply for an ITIN as a Canadian

Canadians who need to file a US tax return apply for an ITIN using Form W-7. How the process works, what to mail, and how to protect your passport.

Aug 21, 2026
Cross-Border

How to Report an NR4 Slip on a US Tax Return

The NR4 reports Canadian-source income and Part XIII withholding. The NR4 slip is Canada's information return for income paid to non-residents.

Aug 21, 2026
Cross-Border

Limitation on Benefits (LOB): When the US-Canada Treaty Denies Treaty Benefits

The US-Canada tax treaty's Limitation on Benefits article can deny treaty benefits to entities that lack a genuine connection to either country.

Sep 4, 2026
Cross-Border

NR301: How Non-Residents Claim Treaty Benefits on Canadian Income

When a Canadian payer sends money to a non-resident (dividends, interest, rent, pension, royalties, management fees). Covers key rules, filing.

Aug 30, 2026
Cross-Border

Reclaiming US Withholding Tax on Dividends and Interest for Canadian Investors

Canadian residents who receive US dividends face 15% treaty-reduced withholding. Some pay the full 30% and can reclaim the excess.

Sep 4, 2026
Cross-Border

Tax Residency Certificate: Form 8802 and the CRA Equivalent

A tax residency certificate proves where you live for treaty purposes. The US uses Form 8802 to request one; Canada uses a letter from the CRA.

Aug 30, 2026
Cross-Border

The US-Canada Tax Treaty: What Each Article Does and When It Applies

How the Canada-US tax treaty allocates taxing rights, sets withholding rates, and prevents double taxation on dividends, interest, pensions.

Aug 24, 2026
Cross-Border

W-8BEN for Canadian Investors: How to Fill It Out and Reduce US Withholding to 15%

A Canadian resident who holds US stocks or receives US-source income gives Form W-8BEN to the payer to reduce withholding from 30% to the 15% treaty rate.

Sep 4, 2026
Cross-Border

W-9 for Canadians: Why You Probably Need a W-8BEN Instead

A US client asked you for a W-9, but Canadians are not US persons. A US client sends you a W-9 to fill out. You are in Canada.

Aug 24, 2026
Cross-Border

When do I actually need to file Form 8833 for a Canada-US treaty position?

You need it when you take the position on a US return that the treaty overrules or modifies US tax law, and no waiver covers you.

Aug 7, 2026
Cross-Border

When Does a Canadian Need to File a US Tax Return?

Canadians file US tax returns for one of four reasons: they hold US citizenship (including accidental Americans who have never lived in the US).

Aug 30, 2026

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