How to file your first GST/HST return in Canada is one of the first practical questions that comes up after you register with the CRA. You have a GST/HST number, you are charging tax on invoices, and now you need to report what you collected, claim any input tax credits, and pay the net amount by the deadline.
The return itself is not complicated, but the first one is easy to overthink. Here is the plain-English process for sole proprietors, freelancers, consultants, and small business owners filing for the first time.
How to file your first GST/HST return in Canada: start with your reporting period
Your first return covers the period from your GST/HST registration effective date to the end of your assigned reporting period. For many new registrants, the CRA assigns annual filing by default, but some businesses elect quarterly or monthly filing.
Check your CRA confirmation letter or My Business Account for three details: your reporting period end date, your return due date, and your payment due date. Annual sole proprietor filers often have a June 15 filing deadline, but the payment may be due April 30 if the fiscal year matches the calendar year. Quarterly and monthly filers usually file and pay one month after the period ends. For a deeper deadline breakdown, see our guide to GST/HST remittance deadlines in Canada.
Step 1: Gather invoices and receipts
Before you open GST/HST NETFILE, collect your records for the reporting period:
- Sales invoices issued after your effective registration date
- The GST/HST you charged or should have charged on taxable sales
- Receipts and bills for business expenses where you paid GST/HST
- Credit notes, refunds, or adjustments
- Platform reports if you sell through marketplaces or payment apps
Keep the registration cut-off in mind. If you registered because you crossed the $30,000 threshold, sales before your effective date may be treated differently from sales after it. If you are still unsure about the trigger date, review how the GST/HST threshold works.
Step 2: Add up GST/HST collected
Add the GST/HST you charged on taxable Canadian sales during the period. This is the tax collected or collectible. “Collectible” matters: if you should have charged HST but forgot, the CRA can still treat it as owing.
Example: you are an Ontario consultant and issued $20,000 of taxable invoices after registering. At 13% HST, you collected $2,600. That amount is part of what you report on your return before deducting credits.
Step 3: Claim eligible input tax credits
Input tax credits (ITCs) are the GST/HST you paid on eligible business expenses. Common examples include software subscriptions, equipment, office supplies, accounting fees, advertising, and subcontractors who charged you GST/HST.
You generally need receipts showing the supplier, date, amount paid, tax amount, and the supplier's GST/HST number when required. If an expense is partly personal, claim only the business-use portion. Our guide to GST/HST input tax credits explains the documentation rules in more detail.
Step 4: Calculate net tax
The basic formula is simple: GST/HST collected minus input tax credits equals net tax. If the result is positive, you pay the CRA. If your ITCs are higher than what you collected, you may have a refund.
Using the Ontario example above: $2,600 collected minus $450 of eligible ITCs equals $2,150 owing. Do this calculation before you file so the online return is just data entry, not detective work.
Step 5: File online and pay
Most small businesses file through CRA GST/HST NETFILE or My Business Account. You will enter your total sales and other revenue, GST/HST collected, ITCs, adjustments if any, and net tax. After submitting, save the confirmation number with your records.
You can pay through online banking by adding the CRA as a payee, through My Payment, or through My Business Account. Pay by the due date even if you file earlier. If you cannot pay in full, file anyway; filing late can create a separate penalty on top of interest.
Common first-return mistakes
- Using calendar-year revenue instead of the actual reporting period
- Forgetting that tax is “collectible” even if it was not collected
- Claiming ITCs without proper receipts
- Mixing exempt revenue with taxable revenue
- Missing the payment deadline for annual filers
HST Hero helps prevent the messy part: it tracks your rolling threshold, GST/HST collected, and estimated net position as transactions happen, so your first return is much easier to prepare when the CRA deadline arrives.
The bottom line
Your first GST/HST return is a summary of three things: what you sold, what tax you collected, and what GST/HST you paid on eligible business expenses. Keep clean records, confirm your reporting period, file on time, and set aside the tax as you invoice. The second return will feel much easier.