W-8BEN for Canadians: What It Is, How to Fill It Out, and Why It Matters

The W-8BEN is a one-page IRS form that cuts your US dividend withholding tax from 30% to 15%. If you're a Canadian holding US stocks or US-listed ETFs, this form is the difference between keeping most of your dividends and handing almost a third of them to the IRS before you ever see them. On a $100,000 USD portfolio yielding 2%, that's $300 a year. For filling out a form that takes 5 minutes.

I honestly don't remember filling mine out. Most brokers slip it into the account opening flow, somewhere between agreeing to 40 pages of terms and picking a password. But that's part of the problem. If you don't remember doing it, you definitely won't remember when it expires.

Table of contents

• What the W-8BEN actually does
• How much it saves you
• How to fill it out (the Canadian version)
• Which accounts need one
• It expires (and your broker might not remind you)
• What the form doesn't do
• The bottom line

What the W-8BEN actually does

The W-8BEN tells the IRS you're a Canadian resident, not an American. That's it. By filing it through your broker, you're certifying your identity and claiming the reduced withholding rate under the Canada-US tax treaty.

Without the form on file, you're a mystery to the IRS. And the IRS doesn't give mysteries a discount. The default withholding rate on US dividends for non-residents is 30%.

With a W-8BEN, that drops to 15% under Article X of the Canada-US tax treaty. For US-sourced interest income, it drops to 0% under Article XI.

You don't send this form to the CRA. You don't mail it to the IRS yourself. Your broker handles the submission. You fill out the fields, click submit (or sign the paper copy if your broker is still living in 2005), and the treaty rate kicks in.

How much it saves you

The math is simple and a little insulting. This is one of the best effort-to-reward ratios in all of personal finance.

At a 2% dividend yield (roughly what you'd get from a broad US index like VOO or VTI), here's what the form is worth.

$25,000 portfolio

Annual dividends: $500 USD Without W-8BEN (30%): $150 withheld With W-8BEN (15%): $75 withheld You keep an extra $75/year

$50,000 portfolio

Annual dividends: $1,000 USD Without W-8BEN (30%): $300 withheld With W-8BEN (15%): $150 withheld You keep an extra $150/year

$100,000 portfolio

Annual dividends: $2,000 USD Without W-8BEN (30%): $600 withheld With W-8BEN (15%): $300 withheld You keep an extra $300/year

$200,000 portfolio

Annual dividends: $4,000 USD Without W-8BEN (30%): $1,200 withheld With W-8BEN (15%): $600 withheld You keep an extra $600/year

The form is valid for 3 calendar years. At $200,000, that's $1,800 in savings before you need to renew. For a form that takes less time than making coffee.

How to fill it out (the Canadian version)

Most Canadians will fill this out electronically through their broker's portal. The fields are the same everywhere. Most of them don't matter. Here are the ones that do.

Your name, country, and address (lines 1-4)

This part is straightforward. Your legal name as it appears on your Canadian tax documents. Country of citizenship is Canada. Permanent address is your Canadian home address. Use your street address, not a P.O. box.

If you've seen W-8BEN guides written for Americans or generic "non-US persons," ignore most of the advice about these fields. You're Canadian. The form is shorter than it looks.

The tax ID fields that confuse everyone (lines 5-6)

This is where most Canadians get stuck, and it's the part that generic guides get wrong.

Line 5 (US TIN): Leave this blank. You almost certainly don't have a US taxpayer identification number, and you don't need one. If you do have a US SSN or ITIN for some reason, put it here. Most Canadians won't.

Line 6a (Foreign tax identifying number): This is your Social Insurance Number. Your SIN. Put it here. This is the field that tells the IRS you're a real Canadian taxpayer with a verifiable identity.

I've seen guides that tell you to put your SIN on Line 5. Don't. Line 5 is for US tax numbers. Line 6a is for foreign (i.e., Canadian) tax numbers.

Getting this wrong won't necessarily blow up your form, but getting it right takes 3 seconds.

Line 6b (FTIN not legally required): Check this box only if your country doesn't legally issue tax IDs. Canada does. Leave it unchecked.

Claiming the treaty rate (lines 9-10)

This is the part that actually saves you money. Everything above was identity. This is where you claim the discount.

Line 9: Check the box. Select "Canada" as the country. You're claiming benefits under the Canada-US tax treaty.

Line 10 (Article and rate): This is where you specify which treaty article applies and at what rate. For dividend income, cite Article X of the Canada-US tax treaty at 15%.

The exact wording varies by broker, but you're looking for something like "Article X, 15% rate on dividends."

If your broker's electronic form pre-fills this section, let it. Most do. If you're filling out the PDF manually, write in Article X and 15%.

Which accounts need one

Every account that can hold US securities needs a W-8BEN on file. But the withholding rate you get depends on the account type.

TFSA

Yes, you need the form. And yes, you'll still pay 15% withholding on US dividends even inside a TFSA. The US doesn't recognize it as a retirement account. (The TFSA didn't exist when the treaty was written, and nobody's updated it since.) Without the form, you'd pay 30%.

I broke down the full withholding tax math in RRSP vs TFSA for US investing.

RRSP

Your broker will likely require the form, but the RRSP gets a better deal. Under Article XVIII of the Canada-US tax treaty, RRSPs are recognized as retirement accounts and exempt from US withholding entirely. That's 0%, not 15%. The same exemption covers RRIFs, LIRAs, and LIFs.

The W-8BEN is still part of the paperwork, but the treaty does the heavy lifting here.

Non-registered (taxable) account

Yes, you need the form. The 15% treaty rate applies. The silver lining is that you can claim a foreign tax credit on your Canadian return for the withholding you paid. That's a separate form (T2209), and a separate article. (Yes, there's always another form.)

FHSA

Same deal as the TFSA. The FHSA isn't recognized as a retirement account under the Canada-US treaty, so the 0% exemption doesn't apply. You'll pay 15% withholding on US dividends with a W-8BEN on file, 30% without.

If you're wondering about RESPs and RDSPs, they're in the same boat as the TFSA and FHSA. No treaty exemption. 15% with the form, 30% without.

One thing to know. You file 1 W-8BEN per broker, not per account. If you have a TFSA, RRSP, and non-registered account all at Questrade, 1 form covers all 3. But if you also have an account at Interactive Brokers (IBKR), that's a separate W-8BEN.

Most brokers handle the W-8BEN electronically during account setup. Questrade prompts it as part of the signup flow. Wealthsimple (WS Trade) embeds it in the account creation process. IBKR has a form in Client Portal that it'll prompt you to complete.

The bank brokerages (TD Direct Investing, RBC Direct Investing, BMO InvestorLine) generally handle it electronically too, though the renewal process varies.

If you opened your account and don't remember filling out a W-8BEN, you probably did it without realizing. It's buried in the onboarding flow at most platforms. But "probably" isn't a word I'd bet $300 a year on. Log in and check.

It expires (and your broker might not remind you)

The W-8BEN is valid until December 31 of the third calendar year after you sign it. Sign it any time during 2025, and it expires December 31, 2028. Not 36 months from signing. The end of the third calendar year. (The IRS loves a rule that sounds simple until you think about it.)

When it expires, your withholding rate reverts to 30%. No grace period. No warning from the IRS.

Your broker is supposed to catch this, and some do. IBKR, in my experience, puts a renewal prompt right in your face when you log in. Others might send an email you'll probably archive without reading.

If your form lapses for 6 months on a $100,000 portfolio, you've overpaid roughly $150 in withholding. You can chase that money down, but it involves paperwork with the IRS that makes the W-8BEN look like a grocery list.

Set a calendar reminder. Seriously. Whatever system you use for things you'll forget about in 3 years, use it for this.

What the form doesn't do

The W-8BEN handles dividend and interest withholding. That's its whole job. People give it more credit than it deserves.

Capital gains

The US doesn't tax non-resident aliens on capital gains from stocks. Buy Apple at $150, sell at $200, and the $50 gain is yours. No US withholding. The W-8BEN has nothing to do with this. (You'll still owe Canadian tax on the gain, but that's between you and the CRA.)

Canadian-listed ETFs that hold US stocks

If you're holding something like VFV, ZSP, or XUU, the withholding tax happens inside the fund, at the fund level, before the ETF distributes to you. Your personal W-8BEN doesn't apply here. The fund's custodian handles it.

I compared these ETFs and their withholding differences in Best Canadian S&P 500 ETFs.

US estate tax

If your worldwide US-situated assets exceed $60,000 USD, your estate could face US estate tax exposure. The W-8BEN doesn't protect you here. That's a different headache entirely, with its own set of forms and its own reasons to lose sleep.

The bottom line

Fill it out. Check if it's current. Set a reminder for when it expires.

The W-8BEN is 5 minutes of paperwork that protects hundreds of dollars a year in dividend income. If you've already opened a brokerage account that holds US securities, there's a good chance you've done it and forgotten about it. Log into your broker, confirm it's on file, and make sure it hasn't lapsed.

If you're just getting started with US investing, I covered the full account setup process in How to Buy US Stocks in Canada.

The form handles the tax side. If you're also losing money on currency conversion every time you buy US stocks, Norbert's Gambit handles that.