What Is GST/HST and How Does It Work for Canadian Small Businesses?

Aug 25

5 min read

Updated: Oct 24

If you run a small business in Canada, understanding GST/HST is an important part of managing your financial responsibilities.

For many business owners, especially those just starting out, sales tax can feel confusing. Knowing when to register, how much to charge, what you can recover, and when to file can make a significant difference in keeping your bookkeeping accurate and your business organized.

This article explains how GST/HST works, when registration may be required, and the bookkeeping practices that can help you stay on top of your obligations.

What Is GST/HST?

GST stands for Goods and Services Tax. HST stands for Harmonized Sales Tax. Both are consumption taxes administered by the Canada Revenue Agency (CRA).

Businesses registered for GST/HST generally collect the applicable tax on taxable sales and account for that tax when filing their GST/HST returns.

An important distinction: GST/HST collected from customers is not business revenue. It represents a tax liability that must be accounted for, although eligible Input Tax Credits (ITCs) may reduce the amount ultimately payable to the CRA.

What about GST in British Columbia?

In British Columbia, GST is generally charged at 5% on taxable goods and services.

Certain goods and services may also be subject to 7% BC Provincial Sales Tax (PST). PST is administered separately from GST and has its own registration, collection, and reporting requirements.

Other provinces may use GST, HST, or a combination of federal and provincial sales taxes. The applicable rate depends on the type of supply and the relevant place-of-supply rules.

For current rates across Canada, refer to the CRA's GST/HST rates and calculator.

When Do You Need to Register for GST/HST?

For most businesses, the small-supplier threshold is $30,000 in revenue from taxable supplies, including zero-rated supplies, measured over a single calendar quarter or four consecutive calendar quarters.

However, the timing of mandatory registration depends on how the threshold is exceeded.

If you exceed $30,000 in a single calendar quarter:

You generally stop being a small supplier on the sale that causes you to exceed the threshold. You must charge GST/HST on that sale and register within 29 days of the effective registration date.

If you exceed $30,000 over four consecutive calendar quarters, but not in one quarter:

You generally stop being a small supplier at the end of the month following the quarter in which you exceeded the threshold. You must then begin charging GST/HST on taxable supplies and register according to the applicable CRA deadlines.

Businesses below the threshold may also choose to register voluntarily. This can be worth considering because registered businesses may be able to recover GST/HST paid on eligible business purchases through Input Tax Credits.

The small-supplier calculation and registration rules have exceptions, so it's important to confirm which requirements apply to your business.

Key Takeaway GST/HST collected from customers is not business income. Accurate records help you understand how much tax you've collected, what eligible credits you can claim, and what you may owe the CRA.

How GST/HST Actually Works

The basic process involves three steps.

1. You collect GST/HST from your customers

When you make a taxable sale, you generally charge the applicable GST/HST rate.

For example, a BC business providing a taxable service for $1,000 would normally charge:

Service fee: $1,000
GST at 5%: $50
Total invoice: $1,050

The $1,000 is business revenue. The $50 is GST collected and must be accounted for in your GST/HST return.

2. You track GST/HST paid on eligible purchases

Your business may also pay GST/HST when purchasing goods or services.

If you're registered for GST/HST, some of that tax may be recoverable through Input Tax Credits (ITCs).

For an ITC to qualify, the purchase must meet the CRA's eligibility and documentation requirements. Not every expense qualifies for a full credit.

3. You calculate the net tax for your GST/HST return

Under the regular GST/HST calculation method, the basic formula is:

Net GST/HST = GST/HST collected − Eligible Input Tax Credits

For example:

GST collected from customers: $500
Eligible ITCs on business purchases: $150
Net GST owing: $350

If eligible ITCs exceed GST/HST collected, you may be entitled to a refund, depending on the circumstances and any required adjustments.

The actual return may include other adjustments, and businesses using special methods, such as the Quick Method, follow different calculation rules.

How Often Do You Need to File GST/HST?

Your GST/HST reporting frequency is generally based on your annual taxable supplies, including those of associated persons where applicable.

For most businesses, the standard reporting periods are:

Annual taxable supplies	Assigned reporting period
$1.5 million or less	Annual
More than $1.5 million, up to $6 million	Quarterly
More than $6 million	Monthly

Eligible businesses may elect to file more frequently than their assigned reporting period.

When are GST/HST returns due?

Monthly filers: Generally one month after the reporting period ends.
Quarterly filers: Generally one month after the reporting period ends.
Annual corporate filers: Generally three months after their fiscal year-end.

Some annual filers may also need to make instalment payments throughout the year.

Your GST/HST filing and payment deadlines are separate from your corporate income tax obligations. Confirm your assigned reporting period and deadlines through your CRA account.

Common GST/HST Mistakes to Avoid

Spending the GST/HST you collect

GST/HST collected is not business revenue, even though the money may be sitting in your bank account.

If those funds are used for operating expenses without considering the upcoming tax liability, your business may face a cash shortfall when payment is due.

A practical habit: Regularly review your GST/HST liability and consider setting aside funds to cover the expected remittance.

Missing filing or payment deadlines

Late GST/HST filing and payments can result in penalties and interest.

Keep a record of your reporting period, filing deadline, and payment deadline. Review them regularly, particularly if your business has changed its reporting frequency.

Not tracking eligible Input Tax Credits

GST/HST paid on qualifying business purchases may be recoverable through ITCs.

However, claiming ITCs requires accurate tax coding, eligible purchases, and appropriate supporting documentation.

Missing receipts, incorrect expense classifications, or improperly recorded sales tax can affect the accuracy of your return.

A practical habit: Review your GST/HST accounts and supporting documents regularly rather than waiting until the return is due.

Not registering or charging GST/HST at the correct time

Businesses sometimes assume they can wait until the end of the year to determine whether registration is required.

But the $30,000 small-supplier threshold is measured using calendar quarters, and the timing of registration and tax collection depends on how the threshold is exceeded.

If you're approaching the threshold, monitor your taxable revenue so you can determine when registration and collection obligations begin.

Assuming your GST/HST report is automatically correct

Accounting software can help track GST/HST, but the accuracy of its reports depends on how transactions are entered and coded.

Before filing, it's important to review sales tax codes, eligible ITCs, adjustments, and supporting documentation.

Key Takeaway Keeping your bookkeeping current makes GST/HST reporting easier, but accurate filing still requires reviewing the transactions and tax information behind the numbers.

Final Thoughts

Understanding GST/HST is an important part of maintaining accurate financial records and meeting your business's tax obligations.

With consistent bookkeeping, proper documentation, and regular reviews, you can identify potential issues earlier and approach filing deadlines with better information.

If you're unsure whether GST/HST is being recorded correctly, reviewing your bookkeeping and sales tax accounts can help identify what needs attention before your next filing deadline.