Starting a business brings a long list of questions, and sales tax is usually near the top. Many new owners in Ontario aren’t sure whether they need to charge HST right away or can wait. Waiting too long can leave you owing tax you never collected.

The good news is that the rules are clear once you understand them. This guide explains when GST/HST registration becomes mandatory, when it’s optional, and when registering early may actually save you money.

Key Takeaways

• Most businesses must register for GST/HST once their taxable revenue goes over $30,000.
• You have 29 days from the day you pass the threshold to complete your registration.
• Taxi and ride-share drivers must register from their first dollar of revenue, no matter how much they earn.
• Registering voluntarily lets you claim input tax credits on business purchases.
• Missing the deadline can mean paying HST out of your own pocket on past sales.

What Is GST/HST?

The Goods and Services Tax (GST) is a federal sales tax charged on most goods and services sold in Canada. Several provinces, including Ontario, combine the GST with their provincial sales tax into one Harmonized Sales Tax. In Ontario, the HST rate is 13%.

As a registered business, you collect HST from your customers and send it to the Canada Revenue Agency (CRA). You’re essentially acting as a tax collector for the government, which is why the CRA takes registration seriously.

The $30,000 Small Supplier Rule

Most small businesses don’t have to register right away. The CRA treats you as a “small supplier” as long as your total taxable revenue stays at $30,000 or less. While you’re a small supplier, you don’t charge HST and you don’t file HST returns.

A few details about this threshold catch people off guard:

• It’s based on revenue, not profit. The $30,000 is your total sales before expenses.
• It includes worldwide sales. Revenue from customers outside Canada still counts.
• Zero-rated sales count too. Sales taxed at 0% are still part of the total.
• Associated businesses are combined. If you own more than one related business, their revenue may be added together.

Two Ways to Pass the Threshold

The CRA checks your revenue in two ways. Knowing which one applies to you tells you exactly when you need to start charging HST.

Over $30,000 in a Single Calendar Quarter

If your sales go over $30,000 within one calendar quarter, you stop being a small supplier on the day of the sale that pushed you over. You must charge HST on that sale and every sale after it, and you have 29 days to register.

This often happens to contractors and consultants who land one large project. A single big invoice can push you over the threshold overnight.

Over $30,000 Across Four Consecutive Quarters

If your revenue builds more gradually, the CRA looks at the last four calendar quarters combined. Once the total goes over $30,000, you remain a small supplier until the end of the following month. After that, you start charging HST and must register within 29 days.

This is the more common situation for growing businesses. It’s also the easiest to miss, which is why keeping your books up to date matters so much. Regular tracking through professional bookkeeping helps you see the threshold coming.

Businesses That Must Register Immediately

Some businesses don’t get the small supplier exemption at all. They must register before they make their first taxable sale, regardless of revenue.

1. Taxi and commercial ride-share drivers, including those driving for Uber or Lyft
2. Non-resident businesses that sell admissions to events or seminars in Canada
3. Certain non-residents who sell taxable goods or services in Canada through specific channels

If you’re starting one of these businesses, plan your HST registration as part of your setup. Our business registration services can take care of this from the start.

Should You Register Voluntarily?

Even if you’re under $30,000, you can choose to register. Many small businesses do, and for good reason. Once you’re registered, you can claim input tax credits (ITCs), which let you recover the HST you pay on business expenses like equipment, software, and supplies.

Voluntary registration usually makes sense if:

• You sell mainly to other businesses that can claim back the HST you charge
• You have significant startup costs and want to recover the HST on them
• You expect to pass $30,000 soon and would rather start with good habits
• You want to look more established to larger clients

It can be less helpful if most of your customers are consumers, since adding 13% raises your prices for them. It also means filing regular HST returns.

What Happens If You Register Late?

If you pass the threshold and don’t register, the CRA can backdate your registration to the date you should have registered. You’d then owe HST on every taxable sale since that date, even though you never charged it to your customers.

That amount comes out of your profit. Interest and penalties may also apply. Late registration is one of the most common, and most expensive, slip-ups we see, along with other common bookkeeping mistakes small businesses make.

How to Register for a GST/HST Number

You can register online through the CRA’s Business Registration Online service, by phone, or by mail. Full details are on the CRA’s GST/HST registration page.

Before you start, have these ready:

1. Your business name and legal structure
2. Your Social Insurance Number or corporation details
3. Your business address and start date
4. An estimate of your annual taxable revenue
5. Your preferred reporting period (annual, quarterly, or monthly)

Your business structure affects how you register and report. If you haven’t decided yet, our guide on choosing between a corporation, sole proprietorship, or partnership is a helpful place to start.

Get Help With Your GST/HST Registration

Registering on time, choosing the right reporting period, and tracking your ITCs can feel like a lot when you’re also running a business. A good accountant makes the whole process simple and keeps you from paying more than you need to.

Wales Accounting has helped businesses across Richmond Hill and the GTA for over 25 years. Call us at (905) 508-9262, visit us at 9555 Yonge St, Unit 309, Richmond Hill, or book a free consultation today.