HST and GST for Canadian Contractors: A Complete Guide

For Canadian contractors and freelancers, GST and HST are unavoidable parts of running a business. Whether you are newly self-employed or have been operating for years, understanding how these taxes work, when you must register, and how to recover what you have paid is essential knowledge. Getting it wrong can mean penalties, missed refunds, or both.

HST vs GST: Understanding the Difference

Canada collects a 5% federal Goods and Services Tax (GST) on most taxable supplies of goods and services. Several provinces have combined their provincial sales tax with the federal GST into a single Harmonized Sales Tax (HST). Ontario charges 13% HST, while New Brunswick, Newfoundland and Labrador, Nova Scotia, and Prince Edward Island each charge 15% HST.

Provinces that have not harmonized collect their own provincial sales tax separately. British Columbia charges 5% GST plus 7% PST. Quebec charges 5% GST plus 9.975% Quebec Sales Tax (QST), which has its own registration and filing process. Alberta charges only the 5% federal GST, with no provincial sales tax at all.

As a contractor, the rate you charge your clients depends on the province where the supply is made, which in most service contracts means the province where your client receives the service.

Do You Need to Register?

You are required to register for a GST/HST account once your worldwide taxable supplies exceed $30,000 in a single calendar quarter or in the total of the last four consecutive calendar quarters. The moment you cross that threshold, you must register immediately and begin charging your clients the applicable rate.

If you are below $30,000, you are considered a small supplier and registration is optional. Many contractors choose to register voluntarily even before hitting the threshold, because registration allows you to claim Input Tax Credits on the GST or HST you pay on your own business expenses. Depending on how much you spend on equipment, software, professional services, and other supplies, those credits can add up to a meaningful amount each year. Voluntary registration also signals to clients, particularly corporate ones, that you are operating formally.

Input Tax Credits: Getting Back What You Paid

When you are registered, you can claim Input Tax Credits (ITCs) for the GST or HST you paid on purchases used in your business. For the vast majority of business expenses, the ITC is simply the tax amount shown on the receipt.

To use an example: if you purchase a $1,000 laptop in Ontario, you pay $130 in HST. Because the laptop is used for your business, you can claim a $130 ITC, which directly reduces the net tax you owe to the CRA.

ITCs are available for office supplies and equipment, professional services like accounting and legal advice, software subscriptions, business travel and accommodations, meals and entertainment at the 50% rate, vehicle expenses for the business-use portion, and home office expenses for the business-use portion. Personal expenses, club memberships, and life insurance premiums are not eligible.

For items used for both business and personal purposes, such as a vehicle, you calculate the ITC based on the percentage of time the item is used for business. Keeping a mileage log or similar record is important to support that calculation.

Filing Requirements and Deadlines

How often you file depends on how much revenue you generate. Annual filing is available if your taxable supplies are under $1.5 million, and this is the default for most freelancers and small contractors. You can also choose to file quarterly or monthly if that works better for your cash flow. Businesses with taxable supplies between $1.5 million and $6 million are required to file quarterly, and those above $6 million must file monthly.

For annual filers, the return is due three months after your fiscal year-end. For quarterly and monthly filers, the return is due one month after the end of the reporting period. Filing late results in interest charges and potential penalties, so marking these dates on your calendar matters.

When you file, you report the total GST or HST you collected from clients, the total ITCs you are claiming, and the difference between the two is your net tax owing. If your ITCs exceed the tax you collected, the CRA will issue you a refund.

The Quick Method of Accounting

Small businesses with taxable supplies under $400,000 per year can elect to use the Quick Method, which simplifies the calculation considerably. Instead of tracking your ITCs for every individual purchase, you remit a flat percentage of your gross revenue, which varies by province and the nature of your business. For service businesses in Ontario, for example, the rate is 8.8%.

The Quick Method can result in tax savings for contractors whose expenses carry relatively little GST or HST, since the flat remittance rate is set below the standard rate. The trade-off is that you forgo detailed ITC tracking. Whether the Quick Method saves you money depends on your specific expense mix, so it is worth running the numbers or asking your accountant before electing it.

Provincial Considerations

Ontario is the most common province for Canadian contractors, and HST filing is consolidated into a single federal return. British Columbia contractors collect and remit 5% GST federally and deal with PST separately for applicable purchases. PST paid in BC is generally not recoverable through ITCs, unlike HST.

Quebec operates its own QST system, which requires a separate provincial registration and a separate QST return filed with Revenu Quebec. QST input tax refunds are available to registered businesses and work similarly to federal ITCs. Alberta remains the simplest province from a sales tax perspective, with only the 5% federal GST to manage and no provincial layer at all.

Record Keeping

The CRA requires you to keep all GST and HST records for six years from the end of the tax year they relate to. That includes invoices you issued to clients showing the tax collected, purchase receipts showing the tax you paid, bank statements, and your ITC calculations. If you are audited, these records are what the CRA will ask to see.

Good tracking software automatically captures the tax component of each transaction and can generate an ITC summary report at filing time. This is far more reliable than trying to reconstruct everything manually from a stack of receipts.

Conclusion

GST and HST compliance is a straightforward obligation once you understand the mechanics. Register when you are required to, or consider registering voluntarily if your business expenses are significant. Track the tax you collect and the tax you pay, file on time, and keep your records for six years. Done consistently, it adds little burden to running your business and can put meaningful money back in your pocket through Input Tax Credits.