HST is one of the most misunderstood obligations for small business owners in Ontario. Many new entrepreneurs either register too late, file incorrectly, or miss out on input tax credits they are entitled to. This guide covers what you actually need to know.
When Do You Need to Register for HST?
You are required to register for HST in Canada once your business revenues exceed $30,000 in any single calendar quarter or in four consecutive calendar quarters. This threshold applies to your total taxable revenues, not just profit.
Once you cross $30,000, you must register and start charging HST. You do not get a grace period until the next tax year. The obligation starts from the moment you exceed the threshold.
Many service business owners hit $30,000 faster than they expect, especially if they incorporate and start taking on regular clients. If you are close to that threshold, register early to avoid missing it.
What Is the HST Rate in Ontario?
Ontario’s HST rate is 13%. This is a combined rate: 5% federal GST and 8% provincial component. When you charge HST on a $1,000 invoice, you are adding $130 and collecting $1,130 from your client.
That $130 does not belong to you. It belongs to CRA. You hold it until your filing deadline and remit it.
Input Tax Credits: The Part Most People Miss
When you are registered for HST, you can claim Input Tax Credits (ITCs) for the HST you paid on business expenses. If you paid $1,300 in HST on business software, office supplies, and professional services this quarter, you can deduct that $1,300 from the HST you collected and only remit the difference.
This is significant. Many business owners think registering for HST is purely a burden. In reality, ITCs often mean you get money back, especially in early stages when expenses are high.
Filing Frequency: Annual, Quarterly, or Monthly?
CRA assigns a filing frequency based on your revenue:
- Annual filers: revenue under $1.5 million — file once per year
- Quarterly filers: revenue between $1.5 million and $6 million — file four times per year
- Monthly filers: revenue over $6 million — file every month
Most small service businesses start as annual filers. You can voluntarily elect to file quarterly if you prefer more frequent reconciliation.
Common HST Mistakes for Service Businesses
- Not registering when you cross the $30,000 threshold
- Registering your incorporated company but forgetting it needs a separate HST number from your personal account
- Missing ITC claims on legitimate business expenses
- Confusing exempt and zero-rated supplies (different treatment)
- Late filing — CRA charges 1% per month on late HST remittances plus a flat penalty
HST for Incorporated vs. Unincorporated Businesses
If you incorporate, your corporation is a separate legal entity and needs its own HST registration number. Your personal HST number from when you were a sole proprietor does not transfer to your corporation. This is a commonly missed step when professionals first incorporate.
Not sure if your HST is set up correctly? Book a free 20-minute intro call with Featherly. We handle HST registration, filing, and ITC maximization for Ontario service businesses.