GST / HST Returns & Filing in Canada

Canadian GST/HST — simple in theory, complicated in practice

The Goods and Services Tax (GST) and Harmonized Sales Tax (HST) are Canada's federal value-added tax. The 5% GST applies in Alberta, the territories, and as the federal component in non-HST provinces. HST — which combines GST and the provincial sales tax into a single tax administered by CRA — applies in Ontario (13%), New Brunswick (15%), Nova Scotia (15%), Prince Edward Island (15%), and Newfoundland and Labrador (15%). British Columbia, Saskatchewan, Manitoba, and Quebec each charge separate provincial-level sales taxes (BC PST, SK PST, MB RST, Quebec QST) in addition to the federal GST.

Every business with annual taxable revenue over $30,000 (calculated over four consecutive calendar quarters) is required to register for GST/HST and begin collecting it on most goods and services sold to Canadian customers. The compliance is more nuanced than most owners realize: which province's tax applies to a sale depends on the place-of-supply rules; certain goods and services are zero-rated (taxable but at 0%) versus exempt (not taxable, and no ITC recovery on related inputs); the Input Tax Credit recovery on business expenses requires proper documentation; and the chosen accounting period (monthly, quarterly, annual) affects cash flow significantly.

Who we serve

• Small businesses approaching or above the $30,000 small supplier threshold who need to register for the first time
• Self-employed professionals charging GST/HST to Canadian clients on consulting, freelance, and contract work
• Corporations selling across multiple provinces and needing to track which sales tax applies to each customer
• Importers and exporters recovering substantial ITCs on imported goods and shipping costs
• Real estate sellers on commercial property sales and assignment sales subject to GST/HST
• Short-term rental operators (Airbnb, VRBO) whose revenue may push them past the small supplier threshold
• Non-resident vendors selling digital products and subscriptions into Canada under post-2021 marketplace rules
• Construction businesses with the complexity of progress billing, holdbacks, and PST on materials in BC/SK/MB

What we deliver

• GST/HST registration with CRA, including selecting the optimal filing frequency (annual, quarterly, or monthly)
• Provincial sales tax registration where applicable (BC PST, Saskatchewan PST, Manitoba RST, Quebec QST through Revenu Québec)
• Periodic GST/HST return preparation, with full ITC reconciliation against your bookkeeping
• Quick Method election analysis and election filing for service businesses where the Quick Method delivers savings
• Net tax calculations including line 105 (total tax collected), line 108 (ITCs claimed), and line 109 (net tax payable or refundable)
• Multi-province sales tax allocation for businesses selling into Ontario, Quebec, BC, and other provinces
• Place-of-supply analysis for telecommunications, electronically supplied services, and services with a location component
• New Housing Rebate, New Residential Rental Property Rebate, and Public Service Bodies' Rebate applications
• CRA GST/HST audit response, voluntary disclosure of unregistered prior years, and Notice of Objection preparation

The Quick Method election — when it saves money, when it doesn't

The Quick Method of accounting is a CRA simplification available to most service businesses with revenue under approximately $400,000. Under the Quick Method, you collect GST/HST as normal on customer invoices, but remit only a reduced fraction of total revenue (a province-specific Quick Method rate) instead of your actual net tax. The trade-off is that you cannot claim ITCs on most operating expenses — but you do retain ITCs on capital purchases above a threshold.

The Quick Method works best for service businesses with low input costs: consultants, IT professionals, designers, coaches, software developers. It can save these businesses several thousand dollars per year. It rarely works for businesses with high input costs: retailers, manufacturers, construction businesses, restaurants — because the lost ITCs exceed the Quick Method savings. We analyze each new client to see whether the Quick Method election is the right call.

Provincial sales tax — the four PST/RST/QST provinces

British Columbia, Saskatchewan, Manitoba, and Quebec each administer their own provincial sales tax separately from CRA. These are sales taxes, not value-added taxes, so they generally apply at the retail point of sale without an Input Tax Credit mechanism for businesses to recover them.

BC PST is 7%; Saskatchewan PST is 6%; Manitoba RST is 7%; Quebec QST is 9.975% (although QST registration is now often combined with GST/HST registration for ease of compliance). Each has its own rules on what is taxable, what is exempt, accommodation surcharges, software taxation, and out-of-province seller obligations. Businesses selling into these provinces from elsewhere in Canada must determine whether they have created provincial sales tax registration obligations under each province's nexus rules.

The most expensive GST/HST mistakes

• Not registering until forced by CRA. Once you cross $30,000 in any four-quarter window, you have 29 days to register. Late registration can mean owing back tax with no possibility of recovering it from customers.
• Missing ITC opportunities. The most-missed ITCs are on home-office expenses, mixed-use vehicle expenses, capital equipment, and pre-registration startup costs.
• Quick Method election in the wrong year. The Quick Method must be elected by the deadline for the first reporting period of the fiscal year. Missing the window means another year of higher tax.
• Charging the wrong provincial rate. Selling into Ontario without charging 13% HST, or selling into BC without charging GST plus BC PST where applicable, leads to under-collected tax that the business often cannot recover from the customer.
• Treating zero-rated and exempt the same. Zero-rated supplies (groceries, exports, prescription drugs) allow full ITC recovery on related inputs. Exempt supplies (financial services, residential rent, most healthcare) do not allow ITC recovery — and getting this wrong costs serious money over time.

Our process

1. Initial review of your sales locations, revenue level, and registration status
2. Recommendation on filing frequency, Quick Method election, and any provincial registrations needed
3. Registration with CRA and applicable provincial authorities
4. Monthly bookkeeping integration that properly codes GST/HST on every transaction
5. Periodic return preparation, review, and CRA filing on your behalf
6. Year-end reconciliation against bookkeeping to catch any timing or coding errors

Frequently asked questions

Related services

GST/HST connects directly to monthly bookkeeping, corporate tax (T2), small business accounting, and CRA audit support.

What Canadian businesses commonly miss about this service

Across the hundreds of Canadian businesses we work with, the same handful of issues come up repeatedly. Many small business owners delay engaging professional accounting until a crisis: a CRA review letter, an unfiled GST/HST return demand, a denied bank loan because financial statements aren't ready, or a Notice of Reassessment that arrived weeks ago. By the time we are first contacted, the cost to fix the problem is often several times what proper ongoing accounting would have cost from the start. Proactive engagement is dramatically cheaper than reactive cleanup.

The Canadian tax landscape also changes constantly. Recent changes that affect most Canadian taxpayers include the 2023 anti-flipping rule (residential real estate sold within 365 days is automatically business income, not capital gain); the Underused Housing Tax (UHT-2900 annual filing requirement for many corporations, partnerships, and trusts holding residential property even when no tax is owing — with $5,000 to $10,000 per-property failure-to-file penalties); the Quebec QST joint registration changes since 2021; the post-2018 Tax on Split Income (TOSI) rules that effectively eliminated casual income splitting through family dividends; the post-2021 $200,000 stock option vesting limit on the 50% deduction for options granted by non-CCPCs; the CSRS 4200 Compilation Engagement standard replacing the older Notice to Reader engagement; and ongoing CRA increased scrutiny on pre-construction assignments, short-term rental businesses, and cash businesses.

How BOMCAS Canada delivers this service

Every engagement begins with a written, fixed-fee engagement letter signed before any work is performed. The engagement letter describes exactly what is in scope, what deliverables you will receive, when those deliverables are due, what your monthly or project fee is, and what (if anything) is outside scope. This eliminates the hourly-billing surprise that most accounting clients fear. The only time we use hourly billing is for genuinely unpredictable items such as CRA audit response or complex one-off projects — and even then we agree to a maximum cap before starting.

Once the engagement letter is signed, you e-sign the CRA authorization (RC59 for businesses or AUT-01 for individuals), and we onboard you to the encrypted client portal with multi-factor authentication. All document exchange flows through the portal — no emailing of sensitive financial documents. Meetings happen by video conference or phone at times that work for you, including outside normal business hours when needed.

Our Canadian tax compliance philosophy

BOMCAS Canada is structured around four operating principles:

1. Tell the truth. If a tax position is aggressive, we say so. If a deduction will not survive a CRA review, we say so. If the engagement is going to cost more than originally quoted because the scope changed, we say so before doing the work.
2. Bill what we said we would bill. No surprise invoices. No scope-creep billing. If something legitimately changes scope, we discuss it and re-quote before doing the additional work.
3. Answer the phone. One-business-day response standard on client communications during normal business hours. No voicemail backlogs.
4. Specialize. Canadian tax and accounting is too complex to be a generalist. We do not do US-only tax, UK tax, or any other foreign jurisdiction in isolation. We are Canadian. Our cross-border work is always anchored by deep Canadian compliance.

What ongoing engagement with BOMCAS Canada looks like

For most clients, the ongoing relationship is structured around predictable monthly deliverables. For an incorporated small business client, that typically includes: monthly cloud bookkeeping with full bank and credit card reconciliation; quarterly or annual GST/HST returns prepared and filed; monthly payroll for owner-managers and any employees, with CRA source deduction remittances; year-end Compilation Engagement (CSRS 4200) financial statements; T2 corporate income tax return; owner-manager T1 personal tax return (and spouse where applicable); annual salary-vs-dividend optimization with written recommendation; unlimited email and phone support during business hours; one quarterly check-in call to review numbers and discuss the business; and CRA correspondence handling for routine review letters.

For a personal tax client, the ongoing engagement includes: annual T1 preparation; any required Quebec TP-1 (for Quebec residents); CRA pre-assessment and post-assessment review response when CRA requests additional documentation; Notice of Assessment reconciliation; and proactive tax planning conversations during the year about RRSP, TFSA, and FHSA contributions, major life events (marriage, kids, retirement, real estate), and any planned business or investment changes.

Frequently asked questions about engaging BOMCAS Canada

Why Canadian businesses choose specialized accounting over generalist accounting

The Canadian tax and accounting landscape has become significantly more complex over the past decade. The 2018 TOSI rules, the 2021 changes to stock option taxation, the 2022 mandatory reporting changes for trusts, the 2023 anti-flipping rule, the Underused Housing Tax, the changes to the small business deduction phase-out for passive investment income, the new CSRS 4200 Compilation Engagement standard, the continued expansion of digital sales tax rules, and the ongoing post-COVID CRA focus on cash businesses and unreported income have all required accountants to specialize more deeply. A generalist firm trying to cover personal tax, corporate tax, US tax, real estate, trusts, cross-border, and every industry vertical inevitably falls behind on the depth of expertise that any one client needs.

BOMCAS Canada is structured deliberately to maintain depth: we are Canadian-only by design; we work in industries where we have genuine specialized experience; we maintain ongoing professional education in Canadian tax law; we use Canadian-experienced staff at every level; and we coordinate with specialized partners (US-licensed cross-border, legal counsel for corporate restructuring, audit-engagement licensed practitioners) where required rather than trying to handle everything in-house.

Talk to a Canadian accountant

Call 780-667-5250 or submit the contact form. We respond within one business day and provide a fixed written quote before any work begins.

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