Canada does not have a single government form that serves as the Canadian equivalent of a W-9. For payments between two Canadian parties, the payer simply collects the payee’s legal name, address, and Social Insurance Number (for individuals) or Business Number (for entities) through its own onboarding paperwork, then reports the payment on a T-slip. When the payer is American and the payee is Canadian, the right form is not a W-9 at all but a W-8BEN (for individuals) or W-8BEN-E (for entities) from the IRS, which certifies foreign status and unlocks the reduced withholding rates in the Canada–U.S. tax treaty.
Domestic Canadian Payments: No Standard Form, Just the SIN or BN
Inside Canada, there is no prescribed intake form. The Canada Revenue Agency does not publish a “collect this before you pay a contractor” document the way the IRS publishes the W-9. Payers gather the payee’s name, address, and tax identification number in whatever way suits them: a clause in the service agreement, a vendor setup form, an onboarding portal, an email exchange.
That collected information then flows into Canada’s T-slip system. The most common slip for contractor payments is the T4A, which covers self-employed commissions, fees for services, and other similar income.1Canada Revenue Agency (CRA). T4A Statement of Pension, Retirement, Annuity, and Other Income Under CRA administrative policy, a T4A must be issued when total payments to a single payee exceed $500 in the calendar year, or whenever tax was deducted.2Canada Revenue Agency. Payments of Fees for Services
Construction is the one industry with its own reporting layer. If more than 50% of your business income comes from construction, you issue a T5018 to any Canadian-resident subcontractor you paid more than $500 (excluding GST/HST) during the year.3Canada.ca. T5018 Slip – Statement of Contract Payments Non-resident subcontractors go on a T4A-NR instead.
Cross-Border Payments: The W-8 Series Replaces the W-9
The W-9 is only for U.S. persons. A Canadian receiving payment from a U.S. company should never fill one out. The correct form comes from the IRS W-8 series, and which one you use depends on your entity type.
W-8BEN is for Canadian individuals, including sole proprietors. It establishes your foreign status and lets you claim treaty benefits on service fees, royalties, and investment income.4Internal Revenue Service. About Form W-8 BEN, Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting (Individuals)
W-8BEN-E is for Canadian corporations, partnerships, trusts, and other entities. It is longer because the entity must classify itself under both Chapter 3 (withholding status) and Chapter 4 (FATCA status). A typical Canadian operating corporation whose income comes mainly from active business will generally classify as an “Active NFFE” for Chapter 4.5Internal Revenue Service. Instructions for Form W-8BEN-E
Without a valid W-8 on file, the U.S. payer must withhold 30% of the gross payment.6Internal Revenue Service. Instructions for Form W-8BEN That is the default rate for payments to foreign persons, and it applies to the whole gross amount, not the net. Get the form to the payer before the first invoice.
When the W-8 Expires
A W-8BEN is not permanent. It stays valid from the date you sign it through the last day of the third calendar year after signing, so a form signed at any point in 2026 expires on December 31, 2029.6Internal Revenue Service. Instructions for Form W-8BEN It also becomes invalid immediately if your circumstances change: you move countries, restructure your entity, or become a U.S. resident. Set a calendar reminder before the expiration date, because a lapse sends the payer straight back to 30% withholding on the next payment.
Treaty Rates That Make the W-8 Worth Filing
The whole point of submitting a W-8BEN or W-8BEN-E instead of just accepting the 30% default is the Canada–U.S. Income Tax Convention.
Business profits earned by a Canadian resident are taxable only in Canada as long as the Canadian has no permanent establishment in the United States. For a freelancer or company performing services remotely for a U.S. client, that means 0% U.S. withholding on the fees.7Internal Revenue Service. Canada – U.S. Income Tax Convention
Royalties are treated in categories. Copyright royalties on literary, dramatic, musical, or artistic works are exempt from U.S. source-country tax at 0%. Most other royalties, including patents, trademarks, and industrial know-how, are capped at 10% of the gross. Motion picture and television royalties do not get the copyright exemption.7Internal Revenue Service. Canada – U.S. Income Tax Convention
To claim any of these rates, you must enter your Canadian tax identification number (SIN or BN) in the Foreign TIN field on the W-8. Leave that field blank and the treaty claim can be rejected, which puts you back at 30%.
SIN or BN: Which Identifier You Give
Canada uses two identifiers, and the choice is straightforward.
The Social Insurance Number is a nine-digit number issued to individuals by Service Canada. It is the identifier for personal income tax filings, employment records, and access to federal programs like Employment Insurance and the Canada Pension Plan.8Government of Canada. Social Insurance Number – Overview It is the closest Canadian counterpart to a U.S. Social Security Number, and Canadian privacy law restricts its use more tightly than the U.S. treats the SSN.
The Business Number is a nine-digit identifier assigned to corporations, partnerships, and sole proprietors who register for federal tax accounts. The same nine-digit root links all of an entity’s CRA accounts (GST/HST, payroll, corporate income tax, import/export), with each account identified by a two-letter program code and a four-digit reference number appended to the BN.9Canada Revenue Agency. Business Number and CRA Program Accounts
Who Is Allowed to Ask for a SIN
Canadian law treats the SIN as sensitive personal information. Only organizations with a specific obligation under a federal statute may request one. Employers must collect the SIN from every employee to file T4 slips.10Canada Revenue Agency (CRA). Get the Social Insurance Number (SIN) From the Individual Financial institutions must collect it when a customer opens an interest-bearing or investment account, because they need it for T5 reporting.11Office of the Privacy Commissioner of Canada. Best Practices for the Use of Social Insurance Numbers in the Private Sector For an account that does not earn interest, such as a credit card, there is no legal basis to request the SIN, and the customer has no obligation to give it.
No private-sector organization is legally authorized to request a SIN for general identification, loyalty programs, or other purposes outside income reporting.11Office of the Privacy Commissioner of Canada. Best Practices for the Use of Social Insurance Numbers in the Private Sector The BN, by contrast, is not restricted. It is meant to be shared with clients, vendors, and government procurement systems, and Canadian businesses routinely put it on invoices.
Why There Is No Single Equivalent Form
A U.S. payer uses the W-9 to collect a payee’s name, address, and Taxpayer Identification Number, plus a certification that the payee is a U.S. person and the TIN is correct. That certification matters in the U.S. system because, without it, the payer must apply backup withholding at 24%.12Internal Revenue Service. Publication 15 (2026)
Canada does not use a standalone certification step. The payer collects the SIN or BN through its own paperwork, the payee confirms the information (usually inside the contract or vendor form), and the payer files the T-slip. The tax authority ends up with the same record of who was paid and how much. There is no Canadian W-9 because the workflow does not need one.