How to Register for GST/HST in Canada

GST/HST Registration: Step-by-Step Process, Voluntary Benefits, and Compliance Pitfalls

Registering for GST/HST is a critical milestone for any growing Canadian business. Whether you are required to register because you have crossed the $30,000 threshold or you are choosing to register voluntarily, understanding the registration process, filing options, and consequences of non-compliance will save you time, money, and potential penalties. This guide walks through every aspect of the registration journey.

Step-by-Step: Registering for a Business Number With CRA

You can register for a GST/HST account in three ways. The fastest is online through CRA Business Registration Online (BRO), accessible via CRA My Business Account or the Registration service for businesses. You will need your Social Insurance Number (SIN), legal business name, business address, type of business activity, fiscal year-end date, and estimated annual revenue. The online process takes about 15 to 20 minutes, and you receive your Business Number (BN) with an RT program account suffix immediately upon completion. Alternatively, you can register by phone by calling CRA at 1-800-959-5525 (Monday to Friday, 9 a.m. to 6 p.m. local time). A third option is to mail Form RC1, Request for a Business Number, to your regional tax services office, though this takes several weeks. For most businesses, online registration is the recommended approach. Once registered, your GST/HST number must appear on all invoices. Learn the required fields in our GST invoice calculation guide.

Voluntary Registration: Why Register Before You Must

If your business earns less than $30,000 per year, you are not required to register, but doing so can offer significant advantages. The primary benefit is the ability to claim Input Tax Credits (ITCs) to recover the GST/HST you pay on business purchases such as equipment, software, office supplies, and professional services. Without registration, you absorb those taxes as a cost. Voluntary registration also lends credibility: some larger clients and government agencies prefer or require that their vendors be GST/HST registered. Additionally, registering early means you are prepared when your revenue grows past the threshold, avoiding the scramble of retroactive registration. The only downside is the administrative obligation to file GST/HST returns and remit collected tax, but for most small businesses this is straightforward, especially with automated invoicing tools. For details on what triggers mandatory registration, see our guide on when to charge GST/HST.

Choosing Your Reporting Period

When you register, CRA assigns a reporting frequency based on your annual taxable supplies. Businesses with revenue under $1.5 million file annually, which means one return per year with the option to pay in quarterly installments. Revenue between $1.5 million and $6 million requires quarterly filing, with returns due one month after each quarter ends. Revenue exceeding $6 million requires monthly filing, with returns due one month after each reporting period. You can voluntarily elect to file more frequently than required. Many small businesses choose quarterly filing even when eligible for annual, because it keeps cash flow more predictable and avoids a large lump-sum payment at year-end. You can change your filing frequency by contacting CRA, though some changes take effect only at the start of the next fiscal year.

The Quick Method of Accounting

The Quick Method is a simplified way to calculate your GST/HST remittance, available to businesses with annual taxable supplies (including GST/HST) of $400,000 or less. Instead of tracking ITCs on every purchase, you remit a fixed percentage of your GST/HST-included revenue. The remittance rate varies by province and business type, typically ranging from 1.8% to 8.8% of revenue. For example, a service-based business in Ontario using the Quick Method might remit 8.8% of HST-included sales rather than calculating actual ITCs. On the first $30,000 of revenue each year, the rate is reduced by 1%. The Quick Method often results in a small net benefit for businesses with few ITC-eligible expenses. You elect the Quick Method by filing Form GST74 with CRA. Note that you cannot claim ITCs on most purchases when using the Quick Method, except on capital property purchases over $30,000.

What Happens If You Should Have Registered But Did Not

If CRA determines that you exceeded the $30,000 threshold and failed to register within the required 29-day window, you face retroactive liability. CRA can assess you for all GST/HST that should have been collected from the date you were required to register, plus interest and penalties. The penalty for late registration is typically 1% of the net tax owing for each month you were late, up to 12 months. You may also lose the ability to claim ITCs for the period you were unregistered, since only registered businesses can claim them. If you realize you should have registered earlier, CRA offers a Voluntary Disclosures Program (VDP) that can reduce or eliminate penalties and prosecution in exchange for coming forward proactively. To be eligible, the disclosure must be voluntary (not triggered by a CRA audit), complete, and involve a penalty. Filing through the VDP is significantly more favourable than waiting for CRA to discover the oversight. Track your revenue thresholds proactively using our CRA tax reporting tools.