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.
The rate you charge depends entirely on your customer's province, not your own. Five provinces charge GST only, at 5%; the rest have harmonized their provincial sales tax into a single HST rate:
| Province | Rate | Structure |
|---|---|---|
| Alberta, British Columbia, Manitoba, Saskatchewan, Quebec | 5% | GST only (provincial sales tax, if any, collected separately) |
| Ontario | 13% | HST |
| Nova Scotia | 15% | HST |
| New Brunswick, Newfoundland & Labrador, PEI | 15% | HST |
Quebec administers its own QST separately through Revenu Québec, though federal GST rules still apply to most Quebec businesses.
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.
To claim an ITC, you need documentation — typically a receipt or invoice showing the supplier's GST/HST registration number, the amount of tax charged, and the date. Claims must be made within four years of the reporting period in which the tax became payable (two years for large businesses), so it pays to reconcile ITCs regularly rather than leaving them until year-end.
Priya is a management consultant operating as a sole proprietor in Calgary. In 2025, she earns $85,000 in consulting fees and charges 5% GST on all invoices.
Priya files quarterly and remits $4,090 for the year across four instalments. Had she not registered, she would have forfeited that $160 in recoverable ITCs — a modest amount here, but one that scales with expenses.
| 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.
Annual filers with a December 31 year-end have until June 15 of the following year to file their return, but any balance owing is still due by April 30 — the same deadline as personal income tax. New registrants are typically assigned an annual filing period by default, but you can elect quarterly if that suits your cash flow better; many small business owners prefer quarterly filing to avoid a large lump-sum remittance at year-end.
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. For 2025, service businesses in 5%-GST provinces remit 3.6% of gross revenue, while retailers and wholesalers in those same provinces remit 1.8%; rates are higher in HST provinces to reflect the higher combined rate. 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. You must also elect the Quick Method in writing before the first day of the reporting period in which you want it to apply.
Continuing Priya's example under the Quick Method: her gross revenue including GST is $85,000 × 1.05 = $89,250. At 3.6%, she would remit $89,250 × 3.6% = $3,213 — compared to $4,090 under the regular method, a saving of $877. The trade-off is that she forgoes claiming her individual ITCs, so the Quick Method only wins when input GST is relatively low compared to revenue.
Not all goods and services are treated the same way under GST/HST rules, and the distinction matters for both registration and ITC claims:
If your business makes a mix of taxable and exempt supplies, you must apportion your ITCs to reflect only the taxable portion of your activity — a calculation where professional guidance often pays for itself.
Failing to register when required, not collecting GST/HST, or remitting late all carry CRA penalties. Late remittances are subject to a penalty of 1% of the amount owing, plus an additional 25% of that 1% for each full month the return is late, up to 12 months. CRA also charges compound daily interest on unpaid amounts at the prescribed rate. Directors of corporations can be held personally liable for unremitted GST/HST under director's liability provisions.
Yes — the sale that causes you to exceed $30,000 is the first sale you must charge GST/HST on. You then have 29 days to register. Retroactive collection on prior sales is not required, but register immediately to avoid penalties on future unregistered sales.
Yes, but not immediately — you must remain registered at least one full year after voluntary registration, then can apply to cancel if revenues have fallen and are expected to stay below the threshold. Mandatory registrants who drop below $30,000 may also apply to cancel; CRA confirms the effective date.
Generally, services to non-residents for use outside Canada are zero-rated (0% charged, ITCs still claimable), but cross-border digital and intangible supply rules are nuanced — always confirm recipient residency and place of supply.
CRA requires retaining records supporting your GST/HST returns for a minimum of 6 years from the end of the year they relate to — sales invoices with your GST/HST number, purchase receipts with supplier registration numbers, bank statements, and contracts. Digital records are fine if complete and accessible. Inadequate records can result in denied ITCs on audit.
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 consultation to get your GST situation assessed.
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