Once a GST/HST registration number is issued, the compliance obligation shifts from a one-time threshold question to a recurring filing cycle. Each reporting period requires a net tax calculation, a completed return, and a remittance by a deadline that does not align with income tax due dates. Understanding the structure of that cycle, and the decisions available within it, is the foundation of GST/HST compliance after registration.
Net Tax: What the Return Measures
Every GST/HST return reports the same fundamental calculation: GST/HST collected on taxable supplies minus input tax credits claimed on eligible business expenses, with the difference remitted to CRA or refunded.
GST/HST collected is the tax you charged on invoices during the reporting period. If you invoiced CAD $10,000 in Ontario in a quarterly period, you charged 13% HST, which is CAD $1,300. That CAD $1,300 is not your revenue. It was collected on behalf of CRA and must be remitted.
Input tax credits (ITCs) reduce what you remit. If you paid CAD $500 in HST on business expenses during the same period, your net tax owing is CAD $1,300 minus CAD $500, which equals CAD $800. If your ITC claims exceed your collections in a period, the return generates a refund rather than a remittance. This happens frequently in periods with large capital purchases or significant software and subscription expenses.
The net tax figure on your return must reconcile with the income reported on your business records. CRA expects the GST/HST collected to align with the taxable revenue in your accounting system. Returns that are inconsistent with income figures attract attention on review.
Filing Frequency and When It Can Change
CRA assigns your filing frequency at registration based on your expected annual taxable supplies:
- CAD $1.5 million or less: annual
- More than CAD $1.5 million up to CAD $6 million: quarterly
- More than CAD $6 million: monthly
Most IT contractors start on annual filing. Annual reporting reduces administrative burden, but it concentrates the remittance into a single large payment and requires either discipline in setting aside collected tax throughout the year or careful cash management when the due date arrives.
Annual filers can elect to file quarterly or monthly with CRA. Some contractors prefer quarterly filing because it creates four smaller remittances instead of one, forces a quarterly reconciliation of the GST/HST account, and produces refunds faster in periods where ITC claims are high. Others prefer annual to minimize filing. A registrant assigned an annual or quarterly period can elect a more frequent period; moving to a less frequent period is not automatic and generally requires taxable supplies to fall below the relevant threshold.
For reporting periods ending in 2024 and later, most GST/HST registrants must file returns electronically. Charities and selected listed financial institutions are the main exceptions. A paper return filed when electronic filing is required can trigger a separate penalty.
Filing and Remittance Deadlines for Annual Filers
For most businesses that file GST/HST annually, the filing deadline and final payment deadline are the same: three months after the fiscal year-end. If an incorporated contractor has a December 31 fiscal year-end, the annual GST/HST return and remittance are due by March 31.
Self-employed sole proprietors have a different rule if all three conditions apply: they are an individual with a business, their GST/HST fiscal year-end is December 31, and they had business income for tax purposes that year. In that case, the GST/HST payment deadline is April 30 and the filing deadline is June 15. If those conditions are not all met, the three-month rule applies.
This means the GST/HST calendar still does not mirror income tax. A December 31 corporation has a GST/HST due date of March 31 even though its T2 return is due June 30. A self-employed contractor with a December 31 year-end may have a June 15 GST/HST filing deadline, but the balance is still due April 30.
Late GST/HST balances attract daily compounded interest, and a return filed late with an amount owing may also trigger a late-filing penalty. The late-filing penalty is 1% of the amount owing plus 25% of that 1% amount for each complete month the return is overdue, up to 12 months. Instalment interest is separate: paying quarterly instalments on time based on one quarter of the prior year’s net tax generally protects against instalment interest even if the current year’s net tax is higher, but it does not protect a late final balance.
Annual Filer Instalment Obligation
Annual filers may have to make quarterly GST/HST instalment payments in the current fiscal year if their net tax for the previous fiscal year was CAD $3,000 or more. If the first GST/HST fiscal year after registration was shorter than 12 months, CRA annualizes that first-year net tax; instalments may be required in the second fiscal year if the annualized first-year amount is CAD $3,000 or more and the second-year net tax is also expected to be CAD $3,000 or more.
GST/HST instalments are due within one month after the end of each fiscal quarter, not on the last day of the quarter. For a December 31 fiscal year-end, the instalment due dates are April 30, July 31, October 31, and January 31.
Each instalment is usually one quarter of the previous year’s net tax. If last year’s net tax was CAD $8,400, each quarterly instalment is CAD $2,100. A contractor may choose to base instalments on a lower estimate of the current year’s net tax, but if the estimate is too low, instalment interest can apply. At year-end, the return reconciles the actual net tax against the instalments paid. Any remaining balance is remitted with the return, and any overpayment is refunded.
This instalment structure is separate from the income tax instalment discussed in quarterly tax instalments for IT contractors. The two systems run on different schedules, use different calculations, and are remitted to CRA under different accounts.
The Quick Method Election
The quick method of accounting for GST/HST is an election available to many small businesses with a permanent establishment in Canada. The revenue threshold is CAD $400,000 or less, including GST/HST, from annual worldwide taxable supplies, including zero-rated supplies and supplies of associates, measured over the relevant four-quarter periods. Some business types and supplies are excluded.
Under the quick method, net tax is generally calculated by applying a flat remittance rate to eligible revenue including GST/HST, rather than tracking GST/HST collected and ITCs on every individual operating expense. The remittance rates vary by province and by whether the business provides services or sells goods. For a service provider in Ontario, the quick method remittance rate is currently 8.8% of gross revenue including HST. You collect 13% HST from clients and remit 8.8% of the gross revenue figure to CRA, subject to the quick method rules and adjustments.
For an IT contractor in Ontario invoicing CAD $100,000 in a year, the HST collected would be CAD $13,000. Under the quick method, the pre-credit remittance is 8.8% of CAD $113,000, which equals approximately CAD $9,944. If the contractor is eligible for the 1% credit on the first CAD $30,000 of eligible supplies, the credit reduces the remittance by CAD $300, to approximately CAD $9,644. The contractor retains the difference without claiming ITCs on most operating expenses.
The quick method simplifies record-keeping significantly: you no longer need to track GST/HST on every operating expense to support an ITC claim. The trade-off is that you cannot claim ITCs on most purchases. Certain ITCs remain available, including on purchases of real property, improvements to real property, and capital assets such as computers or vehicles. If your business has substantial GST/HST on expenses, the regular method may produce a lower net tax. If your expenses are modest relative to revenue, the quick method often results in less remitted and less documentation required.
The election is made online through CRA’s services or by filing Form GST74 and takes effect on the first day of a reporting period. Once elected, the quick method must generally be used for at least one full year before it can be revoked.
ITC Eligibility and Documentation
Under the regular method, an ITC is available for GST/HST paid on a supply that was acquired for consumption or use in the course of commercial activities. The documentation required to support an ITC varies by total sale amount:
- Under CAD $100: supplier name, invoice date or tax-paid date, and total amount paid or payable
- CAD $100 to CAD $499.99: plus the GST/HST amount or indication that tax is included, the tax status of each supply if both taxable and exempt supplies appear on the same invoice, and the supplier’s GST/HST registration number
- CAD $500 and over: plus the purchaser’s name or trading name, a brief description of the supply, and payment terms
The documentation rules are precise. An ITC claim supported by a bank statement entry rather than an invoice does not satisfy the requirements. CRA audits of GST/HST accounts frequently focus on ITC documentation, and claims without adequate support are denied even if the underlying expense was legitimate.
Common ITC-eligible expenses for IT contractors include: software subscriptions, cloud service fees, professional development and courses, home office expenses allocated to commercial use, and professional fees such as accounting and legal. Expenses that are personal or partially personal require allocation. The ITC applies only to the business-use portion.
Capital property and improvements are also eligible for ITCs, but with additional rules around timing and adjustment when the property has mixed personal and business use.
Common Filing Issues
GST/HST not set aside during the year. Collected tax is not income and should not be spent. A contractor who invoices CAD $10,000 plus CAD $1,300 HST and then spends the full CAD $11,300 will owe CAD $1,300 net of any ITCs at remittance time without the cash to cover it. Keeping collected GST/HST in a separate account prevents this.
US client revenue treated as taxable. Advisory, consulting, professional, and technical services supplied to non-resident clients are often zero-rated exports, but the rule is not simply “US client equals no HST.” Services rendered to an individual while they are in Canada, services directly in respect of Canadian real property or tangible personal property, and agency or order-solicitation services can require separate analysis. Zero-rated supplies do not attract GST/HST from the client, but the contractor can still claim ITCs on related expenses. Treating qualifying US client revenue as taxable and collecting HST can be wrong; treating it as exempt and not claiming ITCs is also wrong. The zero-rating treatment requires documentation showing the contracting party, non-resident status, and export basis.
Missing the payment deadline while waiting to file the return. For monthly and quarterly filers, and for most annual filers, the return and final payment are due on the same date. For December 31 sole proprietors with business income, the payment deadline is April 30 and the filing deadline is June 15. If the return is not yet ready, the payment can be sent separately based on an estimated amount. This limits interest while the final figures are being confirmed.
Mixing personal and business expenses. A business expense that is partially personal requires allocation. Including the full GST/HST on a mixed-use purchase as an ITC is not accurate and will not survive a review. Documenting the basis for the allocation protects the claim.
Quebec Perspective
Quebec-based IT contractors generally deal with Revenu Québec for both GST/HST and QST, unless they are in a special category such as a selected listed financial institution. The federal GST/HST account and the QST account remain separate, with separate registration numbers, returns, and remittances. The QST registration guide covers the registration side. Once registered for both, the filing cycle usually runs in parallel: similar periods and calculations, but separate accounts and separate remittances.
The quick method may be available under both systems, with QST-specific remittance rates set by Revenu Québec. Do not assume the GST/HST election, eligibility test, or rate automatically settles the QST treatment. The QST side should be confirmed separately.
Revenu Québec administers QST separately from CRA, and for most Quebec-based businesses it also administers the GST/HST account. A GST/HST result does not automatically settle QST treatment, and vice versa. Contractors with both registrations should ensure that the revenue figures reported on each return are consistent with each other and with the income reported on the T1 and TP-1, or the T2 and CO-17 for corporations.
GST/HST filing is a recurring obligation with its own deadlines, calculations, and documentation requirements distinct from the income tax system. The decisions made at registration, including filing frequency and the quick method election, shape how the ongoing compliance burden is structured. A CPA who manages the GST/HST filing alongside the T1 or T2 ensures that collected tax, ITC claims, and remittances reconcile across the full picture of the business.