Goods and Services Tax (GST) and Harmonized Sales Tax (HST) are among the most important tax obligations for Canadian businesses. Whether you are just starting a business or have been operating for years, understanding your GST/HST obligations is essential to staying compliant with the Canada Revenue Agency (CRA) and avoiding costly penalties. At BOMCAS Canada, our GST/HST filing specialists help businesses across Canada manage their indirect tax obligations efficiently and accurately.
This comprehensive guide covers everything you need to know about GST/HST — from registration and collection to filing, input tax credits, and common compliance pitfalls.
What Is GST/HST?
The Goods and Services Tax (GST) is a federal value-added tax of 5% applied to most goods and services sold in Canada. The Harmonized Sales Tax (HST) combines the federal GST with the provincial sales tax in participating provinces, resulting in a single blended rate that businesses collect and remit to the CRA.
The HST rates vary by province:
| Province | Rate | Type |
|---|---|---|
| Ontario | 13% | HST |
| Nova Scotia | 15% | HST |
| New Brunswick | 15% | HST |
| Newfoundland & Labrador | 15% | HST |
| PEI | 15% | HST |
| Alberta | 5% | GST only |
| British Columbia | 5% GST + 7% PST | Separate |
| Saskatchewan & Manitoba | 5% GST + Provincial | Separate |
In provinces that have not harmonized (Alberta, BC, Saskatchewan, Manitoba, and Quebec), businesses collect GST federally and provincial sales tax separately under provincial rules.
GST/HST Registration Requirements
You are required to register for a GST/HST account when your business's total taxable revenues exceed $30,000 in a single calendar quarter or over four consecutive calendar quarters. This threshold applies to most businesses, including sole proprietors, partnerships, and corporations.
Mandatory Registration
Once your revenues exceed the $30,000 small supplier threshold, you must register for GST/HST within 29 days of the day your revenues exceeded the threshold. From that point forward, you must charge GST/HST on all taxable supplies you make.
Voluntary Registration
Even if your revenues are below $30,000, you may choose to register voluntarily. Voluntary registration allows you to claim Input Tax Credits (ITCs) on your business purchases, which can result in significant tax savings — particularly for businesses with high startup costs or significant capital expenditures.
Who Is Exempt from Registration?
Certain entities are not required to register regardless of their revenues, including most public service bodies (charities, non-profits, municipalities, universities, hospitals) that make primarily exempt supplies. However, if these entities make taxable supplies above the threshold, they may still need to register.
Collecting GST/HST from Customers
Once registered, you must charge GST/HST on all taxable supplies you make in Canada. The rate you charge depends on the province where the supply is considered to be made (the "place of supply" rules).
Taxable vs. Zero-Rated vs. Exempt Supplies
- Taxable supplies: Most goods and services sold in Canada are taxable at the applicable GST/HST rate. You collect GST/HST on these sales and can claim ITCs on related purchases.
- Zero-rated supplies: These are taxable at 0% — meaning no GST/HST is charged to customers, but you can still claim ITCs on related purchases. Examples include basic groceries, prescription drugs, most agricultural products, and exports.
- Exempt supplies: No GST/HST is charged on exempt supplies, and you cannot claim ITCs on related purchases. Examples include most health care services, educational services, long-term residential rentals, and most financial services.
Invoicing Requirements
When you charge GST/HST, your invoices must include your GST/HST registration number, the date of the invoice, the total amount charged, and the amount of GST/HST charged (or a statement that the price includes GST/HST). Proper invoicing is essential for your customers to claim their own ITCs.
Input Tax Credits (ITCs)
Input Tax Credits (ITCs) allow registered businesses to recover the GST/HST paid on business purchases and expenses. ITCs are the mechanism that prevents GST/HST from cascading through the supply chain — only the final consumer bears the full tax burden.
What Expenses Qualify for ITCs?
You can claim ITCs for GST/HST paid on most business expenses, including:
- Office supplies, equipment, and furniture
- Business-use vehicles and related expenses (fuel, insurance, repairs)
- Advertising and marketing expenses
- Professional fees (accounting, legal, consulting)
- Business travel and meals (subject to the 50% limitation for meals and entertainment)
- Capital property used in your business
- Inventory and raw materials
ITC Documentation Requirements
To claim an ITC, you must have supporting documentation showing the supplier's name, the date of the purchase, the total amount paid, and the GST/HST registration number of the supplier (for purchases over $30). Keeping organized records is essential to successfully claiming all ITCs you are entitled to.
ITC Time Limits
ITCs must generally be claimed within four years of the end of the reporting period in which the GST/HST was paid. For large businesses (those with annual taxable revenues over $6 million), the time limit is two years. Do not let unclaimed ITCs expire — review your records regularly with your accountant.
GST/HST Filing Requirements and Deadlines
The frequency of your GST/HST filing depends on your annual taxable revenues:
- Annual filers: Annual taxable revenues of $1.5 million or less. GST/HST return and payment are due three months after your fiscal year-end. Most small businesses file annually.
- Quarterly filers: Annual taxable revenues between $1.5 million and $6 million. Returns and payments are due one month after the end of each quarter.
- Monthly filers: Annual taxable revenues over $6 million. Returns and payments are due one month after the end of each month.
Late filing and late payment result in interest charges and penalties. The CRA charges compound daily interest on unpaid amounts at the prescribed rate plus 4%. A late-filing penalty of 1% of the balance owing, plus 0.25% for each additional month (up to 12 months), also applies.
The Quick Method of Accounting
The Quick Method is a simplified way for small businesses (with annual taxable revenues under $400,000) to calculate their GST/HST remittance. Instead of tracking every ITC, you remit a fixed percentage of your total GST/HST-inclusive revenues to the CRA.
The Quick Method remittance rates vary by province and type of business (service vs. goods-producing). For example, a service business in Alberta would remit 3.6% of its total revenues (including GST) instead of the full 5% collected. The difference represents a simplified ITC that compensates for your input costs.
The Quick Method can significantly reduce your administrative burden and, in many cases, results in a lower net GST/HST remittance than the regular method. However, it is not always the best choice — your BOMCAS Canada accountant can help you determine which method is more advantageous for your specific business.
Common GST/HST Mistakes to Avoid
Many businesses make costly GST/HST errors that result in CRA assessments, penalties, and interest. The most common mistakes include:
- Failing to register on time: Not registering when required can result in back-assessments for all GST/HST that should have been collected, plus penalties and interest.
- Charging the wrong rate: Applying the wrong provincial rate (especially for interprovincial sales) is a common error that can result in under-collection or over-remittance.
- Claiming ITCs on personal expenses: Attempting to claim ITCs on personal or mixed-use expenses without proper allocation is a frequent audit trigger.
- Missing ITC deadlines: Failing to claim ITCs within the four-year time limit results in permanently lost credits.
- Incorrect treatment of exempt vs. zero-rated supplies: Misclassifying supplies can result in either under-collection of GST/HST or improper ITC claims.
- Not keeping proper records: Inadequate documentation for ITC claims is one of the most common reasons for GST/HST audit adjustments.
GST/HST Audits by the CRA
The CRA conducts GST/HST audits regularly, particularly for businesses in high-risk industries or those with unusual ITC claims. During a GST/HST audit, the CRA will examine your sales records, purchase invoices, bank statements, and GST/HST returns to verify that you have correctly collected, reported, and remitted GST/HST.
If you receive a GST/HST audit notice, contact BOMCAS Canada immediately. Our CRA audit representation team will manage the entire audit process on your behalf, ensuring that your records are properly presented and that you receive every ITC you are entitled to.
For professional GST/HST filing, compliance review, or audit representation, contact BOMCAS Canada today. Our GST/HST specialists serve businesses across Edmonton, Alberta, and all of Canada.
GST/HST on Digital Services and E-Commerce
The digital economy has introduced new GST/HST complexities for Canadian businesses. Since July 2021, the CRA has required non-resident digital service providers — including streaming platforms, software companies, and online marketplaces — to register for GST/HST if their Canadian revenues exceed $30,000 over 12 months. This affects how Canadian businesses purchase digital services from foreign suppliers, as they may now receive invoices with GST/HST included.
For Canadian e-commerce businesses selling goods and services online, the same GST/HST rules apply as for traditional businesses. If you sell through an online platform, you are responsible for collecting and remitting GST/HST on your taxable sales. Keeping clear records of all online sales by province is essential for accurate GST/HST reporting.
GST/HST and Real Estate Transactions
Real estate transactions involve some of the most complex GST/HST rules in Canadian tax law. The sale of a newly constructed home is generally subject to GST/HST, though purchasers may be eligible for the New Housing Rebate. The sale of a used residential property is generally exempt. Commercial real estate sales are generally taxable, but the parties may use a joint election under the Excise Tax Act to avoid GST/HST on the sale of a business as a going concern.
Short-term rentals — such as properties listed on vacation rental platforms for periods of less than one month — are taxable, while long-term residential rentals of one month or more are exempt. If you are involved in real estate development, construction, or investment, BOMCAS Canada's GST/HST specialists can help you navigate these complex rules and ensure full compliance.
GST/HST Planning Strategies for Businesses
Proactive GST/HST planning can reduce your compliance burden and improve your cash flow. Consider switching to monthly filing if your business has seasonal cash flow fluctuations — this allows you to claim ITCs more frequently rather than waiting until year-end. Review your supply classification annually to ensure your GST/HST treatment of each product or service remains correct. Claim all available ITCs, particularly on capital expenditures, vehicle expenses, and mixed-use assets. For eligible small businesses, the Quick Method can reduce both your net remittance and your administrative burden. Maintain a GST/HST compliance calendar with automatic reminders for all filing and payment due dates to avoid costly late-filing penalties.
BOMCAS Canada's GST/HST filing team provides comprehensive compliance services including registration, return preparation, ITC reviews, voluntary disclosures, and audit representation. Contact us today to ensure your business is fully compliant and taking advantage of every available tax saving.
