GST/HST compliance is one of the most common areas where Canadian small businesses make costly errors — not from bad intentions, but from incomplete understanding of how the system works. The rules around what is taxable, what qualifies as an Input Tax Credit, when returns are due and how to handle edge cases are detailed enough that most business owners benefit from having a professional manage the filings. At LevelTax, we handle GST/HST registration and ongoing filing for clients across Canada, and this guide covers the full picture of what is involved.
How GST/HST works in practice
GST/HST is a value-added tax. As a registrant, you collect HST on your taxable sales (output tax) and you pay HST on your business purchases (input tax). You remit the difference to the CRA: what you collected minus what you paid. When your input tax exceeds your output tax, the CRA owes you a refund.
This mechanism — called the Input Tax Credit system — is one of the reasons voluntary registration before the $30,000 threshold can be financially beneficial. If your business has significant taxable expenses, you may be recovering more HST than you owe, creating a net refund position.
The net remittance calculation
HST collected on sales minus Input Tax Credits claimed on eligible expenses equals the net amount you remit to the CRA. If this number is negative, the CRA owes you a refund.
Filing frequency and deadlines
Once registered, the CRA assigns you a reporting period based on your revenue level. Choosing the wrong period — or failing to update it as your revenues change — creates compliance problems.
| Filing Frequency | Revenue Threshold | Filing Deadline |
|---|---|---|
| Annual | Revenues under $1.5 million | One return per year. Deadline is three months after your fiscal year end. Most new registrants and small businesses are assigned this period by default. |
| Quarterly | Revenues between $1.5 million and $6 million | Four returns per year, each due one month after the quarter ends. Businesses under $1.5 million can request quarterly filing voluntarily if they prefer more frequent reconciliation. |
| Monthly | Revenues over $6 million | Twelve returns per year, each due one month after the month ends. High-volume businesses or those with significant ITCs sometimes request monthly filing to improve cash flow. |
LevelTax monitors filing deadlines for all GST/HST clients and files returns proactively — before deadlines, not as a reaction to CRA reminders.
Input Tax Credits — what qualifies
Input Tax Credits (ITCs) are the mechanism by which you recover the HST you pay on business expenses. The principle is straightforward: if you paid HST on something you bought to earn taxable income, you can claim that HST back.
These are the most common eligible expense categories for small businesses:
- Accounting, legal and professional service fees (HST charged by your service providers)
- Software subscriptions and technology tools used in the business
- Office rent and related occupancy costs
- Business vehicle expenses where HST was paid on fuel, repairs and insurance
- Marketing and advertising services from Canadian suppliers
- Equipment purchases for use in commercial activities
- Subcontractor and freelancer costs where HST was invoiced
Meals and entertainment expenses are subject to a 50% limitation for ITC purposes — you can claim only 50% of the HST paid on these expenses. Vehicle expenses where the vehicle is also used personally require a business-use percentage calculation.
Are you claiming every ITC you are entitled to?
LevelTax reviews your expense records before each GST/HST filing to identify every eligible ITC. Get in touch and we will review your current filing approach.
When GST/HST results in a refund
Many businesses assume that registering for HST always means owing money to the CRA at filing time. In fact, a refund position is common in several circumstances.
- You are in the early stages and your expenses (with HST paid) exceed your taxable revenues — common for businesses that have recently registered voluntarily
- You make significant capital purchases such as equipment, vehicles or leasehold improvements that carry a large HST component
- Your business operates in a sector with significant input costs but lower-margin revenue
In a refund position, requesting a more frequent filing period (quarterly rather than annual) allows you to receive your refunds faster and improve your cash flow. LevelTax advises clients on their optimal filing period based on their actual numbers.
Common GST/HST filing errors
Claiming ITCs without valid receipts or invoices
The CRA requires that ITC claims be supported by documentation showing the HST number of the supplier, the amount paid, and the date. A credit card statement alone is not sufficient for larger claims.
Misclassifying exempt income as taxable
Some income — including most residential rent, interest, insurance premiums and certain medical services — is exempt from HST. Charging HST on exempt supplies, or incorrectly claiming ITCs on expenses related to exempt activities, creates problems in both directions.
Using the wrong reporting period
Filing annually when the CRA expects quarterly remittances — or vice versa — results in late-filing penalties and interest. If your revenues have changed significantly, your reporting period may need to be updated.
Missing the deadline on a nil return
Even when you have no net HST to remit — because ITCs exceed HST collected — a return must be filed by the deadline. Failure to file results in penalties regardless of the net amount owing.
Failing to account for HST on imported services
If your business purchases digital services or software from a foreign provider, HST may need to be self-assessed and remitted to the CRA, even if the supplier did not charge it.
How to file a GST/HST return
GST/HST returns can be filed online through the CRA My Business Account portal, through your accounting software (such as QuickBooks or Xero), or through your accountant using professional filing software.
You will need the total GST/HST you collected on taxable sales for the period, the total ITCs you are claiming, and the net amount owing or refundable. Payment of the net amount owing is due on the same date as the return.
LevelTax files GST/HST returns for all registered clients as part of their ongoing engagement. We pull the figures from your bookkeeping records, reconcile them against your bank accounts, prepare the return and file it. You receive a copy for your records and confirmation of any remittance required.
Want LevelTax to take over your GST/HST filings?
We handle GST/HST for clients filing annually, quarterly or monthly. Book a free consultation and we will review your current setup.
LevelTax GST/HST services
From registration to every filing, LevelTax handles your GST/HST compliance
We register your business, determine the right filing period, claim every eligible ITC and file on time — every time. Book a free consultation to get started.
Bottom line
GST/HST compliance is manageable with the right systems in place — and costly when those systems are absent.
Late filings, missed ITCs, incorrect tax classifications and remittance errors all create problems that accumulate over time. LevelTax builds the processes that prevent these errors from arising — and handles every filing deadline so that GST/HST is one less obligation on your list.
Talk to LevelTax about your GST/HST compliance