GST/HST Guide for Canadian Small Businesses (2026)

Canadian Sales Tax: One Country, Four Systems

If you run a small business in Canada, you already know that sales tax here is not simple. Unlike the United States, where each state sets its own sales tax independently, Canada has a federal-provincial system that produces four different tax regimes depending on where you operate and where your customers are.

Understanding which taxes apply to your business — and how to collect, remit, and claim credits correctly — is essential. Getting it wrong means penalties from the Canada Revenue Agency (CRA), and nobody wants that letter in the post.

GST, HST, PST, QST: What’s the Difference?

GST — Goods and Services Tax (5%)

The federal consumption tax. It applies across the entire country at a flat 5% rate. Every province has GST, but some provinces have merged it with their provincial tax into the HST.

HST — Harmonized Sales Tax (13%–15%)

Five provinces have harmonized their provincial sales tax with the federal GST into a single tax:

• Ontario: 13% (5% federal + 8% provincial)
• New Brunswick: 15% (5% federal + 10% provincial)
• Newfoundland and Labrador: 15%
• Nova Scotia: 15%
• Prince Edward Island: 15%

If you sell to customers in these provinces, you charge HST — one rate, one remittance to the CRA.

PST — Provincial Sales Tax

Three provinces levy their own separate provincial sales tax on top of federal GST:

• British Columbia: 7% PST + 5% GST
• Saskatchewan: 6% PST + 5% GST
• Manitoba: 7% RST (Retail Sales Tax) + 5% GST

In these provinces, you collect GST and PST separately. PST is remitted to the provincial government, not the CRA.

QST — Quebec Sales Tax

Quebec operates its own system administered by Revenu Québec. The QST rate is 9.975%, charged on top of the 5% GST. If you sell into Quebec, you may need to register separately with Revenu Québec and file QST returns in addition to your GST returns.

The Territories

The Yukon, Northwest Territories, and Nunavut charge only the 5% federal GST. No provincial component.

Do You Need to Register? The $30,000 Threshold

Under the Excise Tax Act, you must register for a GST/HST account with the CRA if your total taxable revenue exceeds $30,000 over four consecutive calendar quarters (or in a single quarter).

Below that threshold, you qualify as a small supplier and registration is optional. However, there are good reasons to register voluntarily:

• Input Tax Credits (ITCs): Only registered businesses can claim back the GST/HST they pay on business expenses. If you buy supplies, equipment, or services for your business, you’re paying tax on those purchases. Without registration, you cannot recover it.
• Professional credibility: Some business customers expect to see a GST/HST number (your Business Number, or BN) on invoices.
• Growth planning: If you’re approaching the threshold, registering early avoids a scramble when you cross it mid-quarter.

Once registered, you receive a 9-digit Business Number (BN) followed by “RT0001” — your GST/HST program account identifier.

Filing Frequency: How Often You Remit

The CRA assigns a filing frequency based on your annual taxable revenue:

You can request a more frequent filing period if you prefer — some businesses opt for quarterly even when they qualify for annual filing, because it produces smaller remittance amounts and steadier cash flow.

Annual filers must still pay quarterly instalments if their net GST/HST owing exceeds $3,000 in the previous year.

Input Tax Credits: Getting Your Money Back

ITCs are the mechanism for recovering GST/HST you paid on legitimate business purchases. This is one of the most valuable aspects of the Canadian system for small businesses — and one of the most commonly underused.

What qualifies for ITCs:

• Office supplies, software subscriptions, professional services
• Equipment and capital purchases
• Rent on commercial premises
• Vehicle expenses (business-use portion)
• Travel and meals (50% limit on meals and entertainment)
• Accounting and legal fees

What does not qualify:

• Personal expenses
• Exempt supplies (residential rent, most financial services, basic groceries)
• Club memberships used primarily for recreation

To claim an ITC, you need supporting documentation: the supplier’s name, their GST/HST registration number, the date, the amount of tax paid, and a description of the goods or services. For purchases under $150, simplified documentation rules apply — but you still need the receipt.

Important: You have up to four years to claim a missed ITC. If you’ve been registered but haven’t been claiming credits on business expenses, go back and review your records.

The Quick Method: Simplified Remittance

If your annual taxable revenue (including GST/HST) is $400,000 or less, you may be eligible for the Quick Method of accounting. Instead of tracking the exact GST/HST collected and ITCs claimed, you remit a flat percentage of your GST/HST-included revenue.

The remittance rates vary by province and business type (service vs. goods), but they’re typically lower than the standard rate. For a service business in Ontario, for example, the Quick Method rate is 8.8% of HST-included sales — compared to the full 13% HST rate.

The trade-off: You cannot claim ITCs on most purchases (except capital property over $30,000). The Quick Method works well for businesses with low expenses relative to revenue — consultants, freelancers, and professional services firms.

You elect into the Quick Method by filing Form GST74. It’s not automatic.

Common Mistakes That Cost Small Businesses Money

1. Charging the Wrong Rate

This is the most frequent error. You must charge tax based on the place of supply — generally where the customer is located, not where your business is. A web developer in Alberta (GST only, 5%) selling to a client in Ontario must charge 13% HST, not 5%.

2. Missing ITCs

Many small business owners pay GST/HST on expenses but never claim it back. Over a year, unclaimed ITCs on rent, software, professional fees, and supplies can easily add up to thousands of dollars left on the table.

3. Late Filing

The CRA charges a penalty of 1% of the amount owing plus 0.25% for each month the return is late, up to 12 months. Interest compounds daily at the prescribed rate. File on time, even if you cannot pay the full amount — the late-filing penalty is separate from and in addition to interest on unpaid balances.

4. Not Separating PST from GST

In BC, Saskatchewan, and Manitoba, GST and PST are separate taxes with separate rules. Some items are PST-exempt but GST-taxable, and vice versa. Lumping them together leads to incorrect remittances.

5. Ignoring Inter-Provincial Sales

If you sell goods or services across provincial borders, the place-of-supply rules determine which tax applies. This matters enormously when you operate in, say, Alberta (no PST) but sell to customers in Ontario (13% HST) or Quebec (5% GST + 9.975% QST).

How Odiverse Helps Canadian Businesses

Multi-Province Tax Rates

Odiverse knows every province’s GST, HST, PST, and QST rate. When you create an invoice, the correct tax is applied automatically based on your customer’s province. No manual lookups, no spreadsheets of rates by jurisdiction.

Automatic ITC Tracking

Every business expense you record in Odiverse is tagged with the GST/HST paid. When it’s time to file, your ITCs are already calculated — no digging through shoe boxes of receipts.

GST/HST Return Preparation

Odiverse generates CRA-ready GST/HST reports that map directly to the fields on your return. Total GST/HST collected, total ITCs claimed, net remittance owing or refund due — all pulled from your actual transaction data.

Place-of-Supply Logic

Sell to a customer in Nova Scotia? Odiverse charges 15% HST. Same product to a buyer in British Columbia? 5% GST + 7% PST, separated correctly. You don’t need to memorise the rules — the system applies them.

One System for Everything

GST/HST is just one piece. Odiverse handles your invoicing, bookkeeping, payroll (CPP, EI, income tax deductions), and financial reporting — all in one place, with an AI assistant that understands Canadian tax obligations.

Get Started

Canadian sales tax doesn’t need to be a burden. With the right system, compliance becomes automatic and ITCs stop falling through the cracks.

Join the waitlist and let Odiverse handle the tax complexity so you can focus on running your business.