Fulfilling foreign compliance while streamlining your own tax reporting
The purpose of a tax treaty is to coordinate tax laws between countries, allowing people to manage their finances without the spectre of double taxation, and to make use of preferred tax rates or procedures negotiated between the parties. One feature of the Canada–United States Treaty is a reduced withholding tax rate when a resident is paid income from the other country.
Like Canada, the US has domestic procedural rules and forms to facilitate this preference, managed by its Internal Revenue Service (IRS). The main requirement for affected Canadians is to file the Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting (individuals), which is more commonly known by its form number, W-8BEN.
Why withholding tax in the first place?
There are three components to any tax system:
- The base upon which tax is levied,
- The rate and mechanics for calculating the tax, and
- The agents and processes for collecting the tax.
A familiar domestic example is that for salary and wages, we pay income tax at graduated rates (i.e.., increasing rates on income at higher brackets). On each payroll run, employers are required to withhold the estimated tax for each employee, and remit those amounts to the Canada Revenue Agency (CRA). Employees then calculate their final tax amount and file their annual tax returns, claiming the withheld amount as a credit against their tax due.
In this domestic frame, withholding tax is not really a tax at all, but rather a collection mechanism. The employee then either tops-up if there is a shortfall, or claims a refund if too much was withheld, but is not paying another tax.
In the cross-border context …
A country has the right to tax the income earned by foreigners on its soil. Its tax authority will require payors of such amounts to withhold and remit a portion to that authority, thereby satisfying the foreign recipient’s tax obligation.
On the receiving end, Canada has the right to levy tax on its residents who receive such income. Indeed, a Canadian resident is taxable on gross worldwide income, not just the net received. Fortunately, when a foreign tax authority withholds tax, that is generally allowed (see next section) as a foreign tax credit (FTC) that reduces the Canadian tax bill. Effectively, the person’s taxes are being split between the two countries.
The ‘benefit’ of the W-8BEN
As indicated in its full title, the W-8BEN certifies who is the “beneficial” foreign owner/recipient of payments made from a United States payor. Absent this identification, the US payor must withhold at the default 30% statutory rate. At first look, the application of that statutory rate may not appear to be a concern if a Canadian taxpayer can claim the FTC as described above, but this is where we return to the qualifier that it is “generally allowed”.
Interaction with claiming foreign tax credits in Canada
When a Canadian taxpayer claims the FTC, the Income Tax Act (ITA) allows an amount this is the lesser of:
- Foreign tax actually paid – This is usually the amount withheld, as a foreign tax return is seldom filed; and
- Canadian tax otherwise payable – This element is in place so that a credit is not given that is greater than the amount of tax Canada itself charges on that same income.
In practice, an additional limitation applies, to confirm that the withholding rate applied by the foreign jurisdiction is in accordance with the relevant tax treaty. In effect, this is a second lesser-of limitation. Returning to the Canada-US Treaty, the negotiated withholding rate on most payments is 15%, so half the US 30% statutory rate.
The whole process is best explained using the following side-by-side illustration.
Illustrating Canadian FTC claim, with and without filing US W-8BEN
Let’s assume a Canadian resident taxpayer at a 40% marginal tax rate receives $1,000 of US-source income. Ultimately, this must be reported in the Canadian dollar equivalent when filing the Canadian tax return, but it’s the effect on the percentage of tax that we’re highlighting, so the currency is not relevant for the illustration.
In sum, regardless whether the W-8BEN is filed, the FTC reduces the Canadian tax by $150 from $400 to $250. But without that filing, the US withholds $300, increasing the combined tax bill from $400 to $550 in the example.
Who completes the form … and how, and when?
For a Canadian investor to get the reduced treaty withholding rate, US law requires withholding agents and qualified intermediaries, including Canadian securities dealers, to obtain the W-8BEN from their clients who directly hold individual US securities and US-listed exchange traded funds (ETFs) and/or who receive US-source income.
Affected income sources include dividends, royalties, rent, annuity payments and interest, acknowledging though that only rarely is withholding applied to interest, such as income from a publicly traded partnership (PTP). While a
W-8BEN doesn’t reduce such withholding, it is useful documentation to help ensure the correct treatment is applied.
Importantly, the filing of a W-8BEN does not create new or increased US taxes, nor does it require the individual to file a US tax return. But to repeat, it can reduce (but not eliminate) US withholding tax.
There is some variation on how the rules apply, according to the way the investor holds their US securities:
- Canadian non-registered account – Collection/filing of the W-8BEN allows for the reduced treaty rate.
- Canadian retirement plan – RRSPs and RRIFs fall into this category, which is entitled to 0% withholding under the Canada-US Treaty. Though the treaty supersedes the W-8BEN, dealers usually still collect the form to support the treaty claim, and otherwise protect against a US payor erroneously applying the 30% statutory rate.
- Other Canadian tax-sheltered accounts – For TFSAs, RESPs, RDSPs and FHSAs, dealers usually collect the W-8BEN so that the treaty rate can be claimed on US-source income. However, be aware that as there is no Canadian tax on income in such accounts, one cannot claim a foreign tax credit for the withholding, whatever amount it may be. Still, the 15% treaty withholding rate is clearly preferable to the 30% statutory rate.
- Canadian mutual funds and ETFs – Under US tax law, the fund is the beneficial owner that is required to complete the W-8BEN, for which it may then claim the reduced withholding rate at the fund level.
Whether the W-8BEN is completed by the investor or a fund, the tax slips delivered from a dealer will report both the foreign income and foreign withholding tax, facilitating the investor’s FTC claim to reduce Canadian tax.
A W-8BEN is valid from the signature date to the end of the third following calendar year. For example, if the form is signed any time in 2026, it is valid until the end of 2029. If there is a change in circumstances to make the information on the form incorrect, a new form must be filed within 30 days of the change.
More information from official IRS sources
W-8BEN in fillable PDF format: https://www.irs.gov/pub/irs-pdf/fw8ben.pdf
Official instructions: https://www.irs.gov/pub/irs-pdf/iw8ben.pdf