How to Add a Trade Name (DBA) to an Existing Corporation in Ontario

You’ve incorporated your Ontario company, congratulations. But your legal corporate name is something like “1234567 Ontario Inc.” and that’s not exactly what you want printed on your business cards, your website, or your invoices.

That’s exactly the problem a trade name (also called a DBA “doing business as”) is designed to solve.

This guide explains everything Ontario corporations need to know about trade name registration like what it is, when you need it, how to do it correctly, what it cannot do, and the common mistakes that catch business owners off guard.

Quick answer: Registering a trade name under your Ontario corporation costs $60 online or $80 by mail in government fees, takes as little as a few hours when filed online, is valid for 5 years, and requires your Ontario Company Key. It does not give you exclusive rights to the name for that, you need a trademark.

What Is a Trade Name / DBA in Ontario?

A trade name is the operating name under which a corporation conducts business, a name that differs from its registered legal corporate name.

Under Ontario’s Business Names Act, any corporation that wants to carry on business under a name other than its exact legal name must register that name.

Some common real-world examples:

• 1234567 Ontario Inc. operating as Maple Roofing
• Brightpath Technologies Inc. operating as BrightIT Solutions
• Sharma Family Holdings Inc. operating as Fresh Basket Grocery

The legal entity your corporation stays the same. The trade name is simply the customer-facing label your corporation trades under.

Trade Name vs. Sole Proprietorship Business Name

A trade name under a corporation is fundamentally different from a sole proprietorship business name registration.

Both are sometimes loosely called a “Master Business Licence” the outdated term no longer used since October 2021 but they attach to different legal entities and carry different implications for liability and taxation. 

Trade Name vs. Trademark

Registering a trade name does not protect that name. Another business in Ontario can legally register the same trade name tomorrow.

If you want exclusive rights to your operating name across Canada, you need to file a trademark through the Canadian Intellectual Property Office (CIPO).

Trade name registration is a compliance step; trademark registration is a protection step. Don’t confuse the two.

When Does Your Corporation Actually Need a Trade Name?

You need to register a trade name if your corporation plans to carry on business under any name other than its exact registered corporate name. Here are the most common scenarios:

• You have a numbered company (e.g., 1234567 Ontario Inc.) and need a real brand name for customers, invoices, and marketing.
• You’re launching a second business line under the same corporation for example, a construction company adding a landscaping division under a new brand.
• You want a separate bank account for a new revenue stream. Banks require a registered business name to open a business account.
• Your corporate name is too generic or technical for public-facing use and you want a more memorable brand.
• You’re a professional corporation that needs to conduct business under a name not restricted by your regulatory body’s naming rules.

Pro tip: Many Ontario entrepreneurs incorporate with a named company from the startso the corporate name and operating name are identical eliminating the need for a separate trade name registration altogether.

What You Need Before You Register

1. Your Ontario Company Key

This is the most overlooked requirement. To register a trade name under an existing corporation through the Ontario Business Registry, you need your Ontario Company Key a unique identifier that links your corporation to the online registry.

• Incorporated after October 19, 2021: Your Company Key was issued at the time of incorporation.
• Incorporated before October 19, 2021: You need to request a Company Key for the first time through ServiceOntario before you can file online.

Can’t locate your Company Key? Contact the Bizincs teamwe help clients retrieve or set up their Company Key as part of the registration process.

2. Your Corporation’s Legal Name and Ontario Corporation Number

You’ll need the exact legal name as it appears on your Articles of Incorporation and your Ontario corporation number. If you’re unsure, look it up via the Ontario Business Registry public search.

3. Your Proposed Trade Name

Choose a name that accurately reflects the business activity and avoids restricted words. In Ontario, trade names cannot include words like “Inc.,” “Ltd.,” “Corp.,” “Limited,” or “Incorporated” unless the corporation actually carries that designation. You also cannot use words that imply a connection to a government body or suggest a regulated profession without proper authorisation.

Should You Do a Name Search First?

Technically, a name search is not required before registering a trade name in Ontario. Practically, skipping it is a bad idea.

Because trade names offer no name protection, two businesses can share the same trade name but that doesn’t mean you should ignore the competitive and branding risks.

More importantly, if your proposed name is too similar to an existing trademark, you could face a cease-and-desist even after your trade name registration is accepted.

Conduct a quick preliminary search using:

• Ontario Business Registry search – Checks existing Ontario business name registrations
• NUANS Canada portal – Searches corporate names and trademarks federally
• CIPO Trademarks Database – Checks for active trademark registrations that could conflict

How to Register a Trade Name in Ontario

The simplest route is to let the Bizincs team handle the registration for you. We file directly with the Ontario Business Registry, manage the paperwork, and send you your registration certificate by email typically within the same business day.

1. Visit bizincs.com and select the Trade Name / DBA registration service.
2. Provide your corporation’s legal name, Ontario corporation number, Company Key, proposed trade name, and business address.
3. Our team reviews your submission, conducts a preliminary name check, and files with the Ontario Business Registry.
4. You receive your Business Name Registration certificate by email. Take it to your bank, update your website, invoices, and CRA business profile.
5. Note your 5-year renewal date we’ll remind you before it expires.

Option B: Register Directly via the Ontario Business Registry

1. Log in to the Ontario Business Registry using your Company Key.
2. Navigate to “Register a Business Name” under your existing corporation profile.
3. Complete the online form: legal corporate name, trade name, business address, and nature of business.
4. Pay the $60 government registration fee online by debit, Visa, or Mastercard.
5. Download and save your Business Name Registration certificate it’s also available as a PDF from your OBR account at any time.

Option C: By Mail

Complete the relevant Business Names Act form and mail it to:

Business and Personal Property Branch 393 University Avenue, Suite 200 Toronto, Ontario, M5G 2M2

Include a cheque or money order for $80 made payable to the Minister of Finance. Processing by mail takes up to 15 business days. This option is only recommended if you don’t have online access.

What to Do After Your Trade Name Is Registered

Registration is step one. Here’s what to update immediately:

• Business bank account: Bring your registration certificate to your bank to open an account under the trade name or update your existing one.
• Invoices and contracts: Use the format “[Corporation Legal Name], operating as [Trade Name]” e.g., “1234567 Ontario Inc., operating as Maple Roofing.” This is a legal requirement under the Business Names Act.
• CRA business number profile: Update your operating name with the Canada Revenue Agency. Your Business Number does not change.
• Website and marketing: You can now publicly use the trade name in advertising, signage, and online.
• Register your domain: Secure the matching .ca and .com domains before someone else does.
• Bookkeeping setup: If this trade name is for a separate division, Bizincs’ bookkeeping and tax services can help you set up clean, separate records from day one.

Important: You must always pair your trade name with your full legal corporate name on all official documents and invoices. Using the trade name alone is non-compliant under the Business Names Act.

Costs and Timelines at a Glance

• Government fee (online): $60 paid by debit, Visa, or Mastercard via the Ontario Business Registry
• Government fee (by mail): $80 cheque payable to the Minister of Finance
• Bizincs service fee: See current pricing at bizincs.com/pricing
• Turnaround time: Same business day online; up to 15 business days by mail
• Validity: 5 years from the date of registration
• Renewal fee: $60 online or $80 by mail, plus any applicable service fee
• Important: The Ontario Business Registry does not reliably send renewal reminders track your expiry date from day one

Tax and Compliance Considerations

A trade name registration is a branding and compliance step. It does not change your corporation’s legal or tax obligations.

• T2 corporate tax return: Still filed under your legal corporate name and Business Number with the Canada Revenue Agency.
• HST/GST: Your HST registration number stays attached to your corporation, not the trade name. Not sure when you’re required to register for HST? Bizincs’ corporate tax team can advise you.
• Annual returns: Your corporation’s annual return obligations to the Ontario Business Registry continue unchanged.
• Multiple trade names: A single corporation can register multiple trade names. Each requires a separate filing fee and has its own independent 5-year expiry.

5 Common Mistakes to Avoid

1. Using the trade name before registration is confirmed

Don’t use the name on invoices, a website, or a bank account application until you have your official certificate in hand. Operating under an unregistered trade name violates the Business Names Act and can result in fines.

2. Assuming registration means name protection

It doesn’t. If brand exclusivity matters, file a trademark through CIPO in addition to your trade name registration. These are two separate steps one doesn’t replace the other.

3. Forgetting the 5-year renewal

Your trade name automatically expires after five years and the Ontario Business Registry does not reliably send reminders. Set a calendar alert at least 60 days before your expiry, or let Bizincs manage renewals for you

4. Not updating invoices and contracts

Using only the trade name on contracts and invoices is non-compliant under the Business Names Act. The correct format every time: “[Legal Name], operating as [Trade Name].”

5. Registering the wrong business type

Make sure you select “Trade Name Registration for a Corporation” in the Ontario Business Registry not a sole proprietorship or partnership registration. Filing under the wrong entity type creates compliance issues that take time to unwind.

Conclusion

Adding a trade name to your Ontario corporation is one of the fastest, most affordable ways to sharpen your branding and it’s a legal requirement the moment you start trading under a name that differs from your registered corporate name.

Ready to Register Your Trade Name? The Bizincs team has helped over 10,000 Canadian entrepreneurs navigate business registration, corporate tax, and compliance. We handle your trade name registration from start to finish, typically within the same business day.