The Goods and Services Tax (GST) is a federal consumption tax charged at 5% on most goods and services sold in Canada. In some provinces, the federal GST is combined with provincial sales tax into a single Harmonized Sales Tax (HST) — with rates varying by province. Alberta, where Swift Accounting operates, has no provincial sales tax, so Calgary business owners charge only the 5% GST on taxable supplies. For incorporated businesses, GST compliance ties directly into your corporate tax obligations — mismanaged ITCs and remittances are among the most common triggers for CRA attention.
As a business, you are not paying GST — you are collecting it on behalf of the government from your customers, and remitting the net amount (after claiming input tax credits) to the CRA. Understanding this collection-and-remittance structure is fundamental to managing GST obligations correctly.
You must register for a GST/HST account if your taxable revenues exceed $30,000 in any single calendar quarter or in four consecutive calendar quarters. This threshold applies to your taxable supplies — most goods and services. Once you exceed $30,000, you must register within 29 days and begin charging GST from the date you crossed the threshold.
Note: the $30,000 threshold is based on when you cross it, not on your full-year revenue. If you earn $35,000 in a single quarter, you must register even if you had no income in previous quarters and expect none going forward.
You can register voluntarily at any time, even before reaching the $30,000 threshold. Voluntary registration makes sense if you have significant GST-taxable expenses, because registration allows you to claim Input Tax Credits (ITCs) — refunds of the GST you paid on business purchases. A startup spending $20,000 on equipment (with $1,000 of GST) before earning any revenue can recover that $1,000 by registering voluntarily.
However, registration also means you must charge GST to your customers, which can be a pricing disadvantage if your customers are end consumers (not businesses) who can't recover the GST themselves.
The most important benefit of GST registration is the ability to claim ITCs — the right to recover the GST or HST you paid on purchases used in your commercial activities. If you paid $500 in GST on business expenses during a reporting period, and collected $800 in GST from customers, you remit only the net $300 to CRA.
Eligible ITC purchases include:
You generally cannot claim ITCs on personal expenses, exempt supplies, or expenses that are not for commercial activities.
| Annual Revenue | Filing Frequency | Filing Deadline |
|---|---|---|
| $1.5 million or less | Annual | 3 months after fiscal year end |
| $1.5 million to $6 million | Quarterly | 1 month after quarter end |
| More than $6 million | Monthly | 1 month after month end |
Most small Calgary businesses with revenues under $1.5 million file annually. Annual filers with net tax owing of $3,000 or more may be required to make quarterly instalment payments throughout the year, with a final reconciliation when the annual return is filed. Calgary businesses with employees face a separate but equally strict remittance schedule for payroll source deductions — our payroll services guide covers the full CRA remittance timeline and penalty structure.
Small businesses with annual taxable revenues of $400,000 or less (after GST) can elect to use the Quick Method of accounting. Under this method, you charge customers the regular GST rate (5% in Alberta) but remit a lower flat percentage to CRA (currently 3.6% for service businesses in Alberta). The difference is yours to keep as a simplified compensation for the costs of compliance.
The Quick Method trades simplicity for the ability to claim most individual ITCs. It works well for service businesses with few GST-taxable purchases. You cannot use the Quick Method for fiscal years in which you provided financial services, purchased real property, or were a listed financial institution.
GST compliance errors are among the most common CRA issues we resolve at our Calgary accounting firm — for Calgary business owners — whether it's failure to register on time, incorrect ITC claims, or missed filings. Retroactive GST assessments can run into tens of thousands of dollars for businesses that crossed the $30,000 threshold without registering. Swift Accounting handles GST registration, return preparation, and CRA correspondence for incorporated businesses and sole proprietors at every stage. If you're weighing the right accountant to manage your ongoing compliance, our guide to how to choose an accountant in Calgary outlines the key questions to ask. Book a free consultation to get your GST situation assessed.