Starting a business in Ontario involves more than developing a product or finding customers. One of the most important responsibilities for startups and small businesses is understanding sales tax obligations and ensuring compliance with Canada Revenue Agency (CRA) requirements.
For many entrepreneurs, GST/HST rules can feel confusing at first. Questions about when to register, how much tax to charge, and what expenses qualify for tax credits are common among new business owners.
As businesses continue to embrace digital commerce and online services in 2026, sales tax compliance has become even more important. Whether you operate a retail store, provide professional services, or sell products online, understanding the basics of GST/HST can help your business avoid costly mistakes and remain financially organized.
At Koroll & Company, Ontario businesses receive professional accounting guidance to help navigate evolving tax and compliance requirements.
In Canada, businesses generally collect either the Goods and Services Tax (GST) or the Harmonized Sales Tax (HST) on taxable goods and services.
Ontario is an HST province, meaning the province combines:
Together, this creates Ontario’s 13% HST rate.
Most businesses selling taxable products or services in Ontario are required to charge and collect HST once they exceed the small supplier threshold.
A business typically must register for GST/HST when taxable revenues exceed:
This threshold applies to total worldwide taxable revenues generated by the business and associated entities.
Once the threshold is exceeded, businesses are generally required to:
Failing to register on time can lead to penalties, interest charges, and unexpected tax liabilities.
Even if revenues remain below the $30,000 threshold, many startups choose to voluntarily register for HST.
Why?
Because registered businesses can recover HST paid on eligible business expenses through Input Tax Credits (ITCs).
This can provide important cash flow benefits during the startup phase when businesses are purchasing equipment, software, supplies, and professional services.
For example, a new Ontario business may pay HST on:
Without HST registration, that tax becomes an unrecoverable expense.
Most goods and services sold in Canada are considered taxable supplies.
Taxable supplies generally include:
Some goods and services are zero-rated, meaning tax applies at 0%.
Examples include:
There are also exempt supplies that do not require GST/HST collection, such as many financial services and residential rent.
Understanding the difference between taxable, zero-rated, and exempt supplies is important because it affects both tax collection and ITC eligibility.
Some new business owners mistakenly assume HST only applies to physical products. However, most service-based businesses in Ontario are also required to charge HST once they exceed the registration threshold.
This applies to industries such as:
As remote and online services continue expanding in 2026, service businesses must pay closer attention to customer location and place-of-supply rules.
Ontario businesses that sell products or services outside the province may need to charge different tax rates depending on where customers are located.
For example:
These rules are known as “place of supply” rules.
The correct tax treatment depends on several factors, including:
Businesses selling nationally through e-commerce platforms should review these rules carefully to ensure proper compliance.
Many Ontario startups now operate globally through e-commerce, digital services, and online consulting.
In many cases, exported goods and services qualify as zero-rated supplies.
This means:
Proper documentation is extremely important. Businesses should retain shipping records, contracts, invoices, and customer location details in case of CRA review.
International tax obligations may also arise depending on where customers are located.
CRA compliance reviews have become increasingly digital in recent years.
In 2026, businesses should expect greater scrutiny regarding:
Accurate bookkeeping is no longer optional.
Businesses should maintain organized records for:
Cloud-based accounting systems can help businesses improve reporting accuracy and simplify tax preparation.
Many startups unintentionally create tax problems early in their growth stages.
Some of the most common mistakes include:
Even small errors can create significant issues during a CRA audit.
Sales tax compliance is one of the foundational responsibilities of running a successful business in Ontario.
Understanding GST/HST obligations early helps businesses:
As tax rules continue evolving alongside digital commerce and online business operations, professional accounting support can help businesses stay compliant and focused on growth.
To learn more about GST/HST registration, bookkeeping, and tax compliance services, visit Koroll & Company.