Do I Need to Register for HST in Ontario? Thresholds Explained
Understand the CRA $30,000 small supplier threshold in Ontario, when mandatory GST/HST registration triggers, voluntary registration benefits, and filing frequencies.
The CRA $30,000 Small Supplier Rule in Ontario
In Ontario, businesses must collect and remit the 13% Harmonized Sales Tax (HST) once they exceed the Canada Revenue Agency (CRA) small supplier threshold.
Understanding when this obligation begins protects you from unexpected back-taxes and penalties.
When Is HST Registration Mandatory?
You are legally required to register for a GST/HST account with the CRA if your gross worldwide taxable supplies (sales before expenses) exceed $30,000 CAD:
- In a single calendar quarter: You cease to be a small supplier immediately. You must register and begin collecting HST on the sale that caused you to exceed $30,000.
- Over four consecutive calendar quarters: You cease to be a small supplier at the end of the month following the quarter in which you crossed the $30,000 mark.
Mandatory vs Voluntary HST Comparison
| Factor | Small Supplier (< $30k) | Exceeding Threshold (> $30k) |
|---|---|---|
| Registration Status | Voluntary | Mandatory |
| HST Collection (13%) | Do NOT charge unless registered | Must charge and remit 13% HST |
| Input Tax Credits (ITCs) | Only if voluntarily registered | Eligible to recover HST on all business expenses |
| Filing Frequency | Annual (typically) | Annual, Quarterly, or Monthly |
Advantages of Voluntary Registration
Even if your revenue is under $30,000, voluntary registration offers key benefits:
- Input Tax Credits (ITCs): You can recover all 13% HST paid on business equipment, software, tools, legal fees, and supplies.
- B2B Credibility: Corporate clients expect an HST number on commercial invoices.
- Immediate Preparation: No risk of crossing the threshold unexpectedly and failing to collect tax.
Next Steps
- Read our detailed Ontario GST/HST Tax Guide.
- Explore general business taxes on our Taxes Overview page.
- Review compliance requirements on our Ontario Compliance Hub.
Frequently asked questions
- What is the small supplier revenue threshold for HST in Ontario?
- The small supplier threshold is $30,000 CAD in gross worldwide taxable sales across any single calendar quarter or across four consecutive calendar quarters.
- What is the HST rate in Ontario?
- The Harmonized Sales Tax (HST) rate in Ontario is 13% (composed of a 5% federal component and an 8% provincial component).
- Can I register for HST voluntarily if my revenue is below $30,000?
- Yes. Voluntary registration allows you to claim Input Tax Credits (ITCs) to recover the 13% HST paid on business expenses, equipment, and inventory.
Official sources
- Ontario Business Registry ↗— file and search Ontario registrations
- Corporations Canada ↗— federal incorporation
- Canada Revenue Agency — business ↗— BN, HST, payroll, T2
Related articles
When an Ontario corporation must file its T2 corporate tax return, when the balance owing is due, and how to calculate both from your year-end.
GST/HST return and payment deadlines for Ontario businesses by filing frequency, including the June 15 rule for annual individual filers.
Worked examples of Ontario corporate tax at the combined 12.2% small business rate and 26.5% general rate, for $100k, $500k and $700k of income.
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