📋 GST/HST Compliance Canada — Troubleshooting Guide
Common GST/HST Filing Errors
and Solutions: Troubleshooting
📌 Quick Summary
GST/HST errors are among the most common — and most expensive — compliance mistakes Canadian businesses make. Wrong provincial rates, unclaimed input tax credits, late filing penalties, incorrect place-of-supply determinations, and missed registration deadlines collectively cost Canadian businesses tens of millions in avoidable penalties and lost ITC refunds every year. This comprehensive troubleshooting guide identifies every major GST/HST filing error category, explains exactly what goes wrong and why, and provides the specific solution for each problem — whether you are fixing past errors or preventing future ones.
1. GST/HST Overview — The Framework Every Business Must Understand
The Goods and Services Tax (GST) and Harmonized Sales Tax (HST) is Canada’s federal consumption tax. The GST rate is 5%. In provinces that have harmonized their provincial sales tax with the federal GST, the combined HST rate is higher: Ontario 13%, New Brunswick/Nova Scotia/Newfoundland & Labrador/PEI 15%. Saskatchewan, Alberta, Manitoba, British Columbia, and Quebec have not harmonized — businesses in these provinces charge 5% federal GST separately from provincial sales tax (PST/QST). Every business generating more than $30,000 in taxable supplies in any calendar quarter or four consecutive calendar quarters must register for GST/HST and file periodic returns.
For mobile app and software businesses where GST/HST on digital services creates specific complexity, our Mobile App Business Plan guide covers the sector-specific context. Automotive businesses should see our Automotive Business Tax Planning guide. Startups setting up GST/HST for the first time should review our Complete Fractional CFO Services for Startups guide. First-time business owners should read our First-Time Business Owner Tax Compliance guide. Saskatchewan businesses with PST in addition to GST should see our Business Name Registration guide. For documenting business expenses that generate ITCs, our Documenting Business Expenses guide is essential. Tourism businesses with complex GST/HST treatment should see our Tourism Business Plan guide. And e-commerce businesses selling digital products should review our E-Commerce Tax Planning guide.
$30K
GST/HST registration threshold — mandatory once taxable revenues exceed $30,000 in any quarter or four consecutive quarters
1%/month
Late filing penalty rate — automatic assessment on amount owing, up to 12 months; doubles to 2%/month on repeated late filing
4 years
ITC claim limitation period — ITCs must be claimed within 4 years of the return filing deadline; unclaimed ITCs are permanently lost
Section 169
ITA provision governing ITC eligibility — the legal foundation for all input tax credit claims; requires tax paid, business purpose, and supporting documentation
📋 Are You Making GST/HST Errors That Are Costing You Money or Creating CRA Risk?
Custom CPA reviews your GST/HST filing history, identifies errors and unclaimed ITCs, and implements the compliance system that eliminates filing errors and maximizes legitimate ITC recovery.
2. Error: Wrong GST/HST Rate Applied
ERROR
Charging the Wrong Provincial GST/HST Rate
What goes wrong: a Saskatchewan business charges every customer 5% GST — including customers in Ontario who should be charged 13% HST. An Ontario business charges 13% HST to an Alberta customer who should pay only 5% GST. An online retailer uses a flat 5% GST on all Canadian sales regardless of delivery province.
Why it happens: the place-of-supply rules are not intuitive. The applicable rate is determined by where the goods are delivered or where the service is received — not where the seller is located. Businesses that sell to customers across multiple provinces must apply the destination province’s HST rate — a task that requires either manual rate management or a properly configured e-commerce or invoicing platform.
The financial consequence: undercharging the correct rate: the seller owes the correct amount to CRA regardless of what they charged the customer. A seller who charged 5% GST to an Ontario customer but owed 13% HST must pay the 8% shortfall from their own funds. Overcharging: charging an Alberta customer 13% HST when only 5% GST was required; the seller must refund the 8% excess to the customer or apply for an adjustment.
✓ The Fix
Configure your invoicing software (QuickBooks, FreshBooks) or e-commerce platform (Shopify, WooCommerce) to automatically apply the correct GST/HST rate based on the customer’s province of delivery. For physical goods: province of delivery. For services: province where service is performed. For digital products: province of the recipient’s billing address. Review past returns — if systematic rate errors were made, file adjusted returns for the affected periods.
3. Error: Missed or Unclaimed Input Tax Credits
ERROR
Failing to Claim All Eligible ITCs
What goes wrong: GST/HST paid on business expenses is a refundable credit — but only if it is actively claimed on the GST/HST return. Many businesses consistently under-claim ITCs because: receipts are not coded as GST-paid in the accounting software; the bookkeeper is not aware of ITC eligibility rules; mixed personal/business expenses are excluded entirely rather than partially claimed; or the business is unaware that certain categories of expense are ITC-eligible.
Commonly Missed ITC Categories — Annual Recovery Potential
✓ The Fix
Review past 4 years of GST/HST returns for unclaimed ITCs. File amended returns or request adjustments through CRA’s My Business Account. Ensure accounting software codes every expense with the GST/HST amount paid. Set up a monthly ITC reconciliation: total GST/HST paid on business expenses from the accounting system must match the ITC line on the HST return.
4. Error: Charging GST/HST on Exempt Supplies
ERROR
Collecting GST/HST on Supplies That Are Legally Exempt
What goes wrong: a business collects GST/HST from customers on supplies that are exempt under the Excise Tax Act. The collected amount must be remitted to CRA — but the customer who paid the exempt supply’s “HST” was not legally required to pay it, creating a potential refund obligation.
| Exempt Supply Category | Why Commonly Confused | Correct Treatment |
|---|---|---|
| Long-term residential rental (30+ days) | Landlords sometimes charge GST on residential rent, believing all rent is taxable | Exempt — no GST charged; no ITCs on inputs used exclusively for residential rental |
| Medical services (physicians, dentists, optometrists) | Practices sometimes charge HST on services before confirming exemption | Exempt — physician and dental services are exempt under ETA Schedule V, Part II |
| Psychological services | Confusion between registered psychologists (exempt) and unregulated counsellors (taxable) | Registered psychologist services: exempt. Unregulated counsellors: taxable. |
| Registered psychotherapy in Ontario (post-Oct 2024) | RPs who were collecting HST before the 2024 exemption may not have updated their billing | Exempt from October 2024 onward for Ontario RPs. Stop collecting HST on psychotherapy. |
| Financial services (interest, insurance premiums) | Some businesses charge HST on financial service fees that are specifically exempt | Financial services as defined in ETA are exempt. Confirm category with CPA. |
| Basic groceries | Food retailers sometimes apply GST to zero-rated grocery items | Zero-rated (0% GST) for most food for human consumption. Prepared food and restaurant meals are taxable. |
✓ The Fix
Review your supply categories against the ETA Schedule V (exempt) and Schedule VI (zero-rated) lists. For any supply you are uncertain about, confirm with a CPA before charging GST/HST. If you have been incorrectly charging GST on exempt supplies: stop collecting immediately; file adjusted returns; and refund the incorrectly charged amounts to customers or apply to CRA for a direction on how to handle the adjustment.
5. Error: Late Filing and Late Remittance
ERROR
Missing GST/HST Filing and Payment Deadlines
The penalty cascade: GST/HST deadlines are unforgiving. Missing the filing deadline — even by one day — triggers automatic penalty assessment if there is an amount owing. Missing the payment deadline triggers immediate interest at compound daily rates. Director personal liability means the consequences extend beyond the corporation.
📋 GST/HST Filing Due Dates by Filing Frequency
Monthly filers (annual taxable revenue above $6M): returns and remittances due on the last day of the month following the reporting period. January period: due February 28/29. February period: due March 31. And so on. Electronic filing is mandatory for monthly filers. Large Business
Quarterly filers (annual taxable revenue $1.5M–$6M, or elected quarterly): quarterly period ending March 31 — return and remittance due April 30. Quarter ending June 30 — due July 31. Quarter ending September 30 — due October 31. Quarter ending December 31 — due January 31. Most Common
Annual filers (annual taxable revenue under $1.5M): annual return due 3 months after fiscal year-end. For December 31 year-end: due March 31. For a non-December 31 year-end: due 3 months after that year-end. However: annual installments are required if you filed a net tax amount over $3,000 in either of the two preceding years. Small Businesses
File even if you cannot pay — the most important rule: if you cannot remit the full amount by the due date, file the return on time anyway. Filing eliminates the late-filing penalty (1%/month on the amount owing). The amount owing plus daily compound interest continues to accrue — but without the additional penalty. The interest rate is bad enough; adding a filing penalty is avoidable. Critical Rule
✓ The Fix
Set calendar reminders for every GST/HST due date — 2 weeks in advance to allow filing preparation time, and on the due date. Set aside HST collected from customers in a dedicated sub-account so funds are always available for remittance. If you have already missed a deadline: file and pay immediately; the penalty stops accruing on the filing date. Contact CRA to confirm the exact amount owing including penalties and interest before paying.
6. Error: Incorrect Place of Supply Determination
ERROR
Applying Seller’s Province Rate Instead of Buyer’s Province Rate
The rules in plain language: for most supplies, the applicable GST/HST rate is determined by where the supply is made — the destination province, not the seller’s province. This affects every business that sells to customers in multiple Canadian provinces.
| Supply Type | Place of Supply Rule | Common Error |
|---|---|---|
| Physical goods shipped to customer | Province where goods are delivered to the customer | Seller charges their home province rate regardless of delivery destination |
| Services (most types) | Province where the service is primarily performed | Charging HST on services performed in an HST province for a customer in a non-HST province |
| Digital products (ebooks, software, subscriptions) | Province of the recipient’s billing address or residence | Applying a flat 5% GST to all digital sales regardless of customer location |
| Real property services (construction, renovation) | Province where the real property is located | Charging home province rate for work performed at a property in another province |
| Intangible personal property (IP licenses, software rights) | Province of use by the recipient | Applying seller’s province rate to IP licensed for use in a higher-HST province |
✓ The Fix
Configure your accounting and invoicing software with province-of-delivery-based tax rules. For e-commerce: Shopify and WooCommerce both support automatic provincial rate application — confirm the settings are correct. For B2B services: confirm the province where the service is primarily performed when the customer is in a different province. Review prior returns for systematic place-of-supply errors — the most common pattern is a non-HST province business undercharging HST to HST-province customers.
7. Error: Failing to Register When Required
ERROR
Operating Without GST/HST Registration After Crossing $30,000
What goes wrong: a business crosses the $30,000 taxable revenue threshold — either in a single quarter or cumulatively over 4 quarters — and continues operating without registering. The business collects no GST, claims no ITCs, and files no returns. CRA identifies the gap through T2 income cross-referencing, payment processor data, or industry targeting audits.
The retroactive assessment: CRA can assess GST/HST retroactively from the date the registration obligation arose — plus penalties and compound interest. If a business had $300,000 in taxable Ontario revenue in the 2 years it operated unregistered: retroactive HST = $300,000 × 13% = $39,000 — plus 1% penalty and compound interest. Because the HST was never collected from customers, this $39,000+ comes from the business’s own funds.
✓ The Fix
If you have been operating unregistered beyond the threshold: consult a CPA about the Voluntary Disclosure Program (VDP) before CRA contacts you. VDP disclosures typically result in: penalty waiver; interest reduction in some cases; and no criminal investigation for non-willful omissions. The VDP application must be complete and accurate — engage a CPA to manage the disclosure. Going forward: track cumulative taxable revenue monthly and register within 29 days of crossing $30,000.
8. Error: Misclassifying Zero-Rated and Exempt Supplies
ERROR
Confusing Zero-Rated (0%) with Exempt Supplies
The critical distinction most business owners miss: zero-rated supplies (Schedule VI of the ETA) and exempt supplies (Schedule V) are both non-taxable — but they have completely different ITC treatment.
📈 Zero-Rated vs. Exempt — The Critical ITC Difference
Zero-rated supplies (0% GST charged to customer) — the supply is taxable — just at a 0% rate. Because the supply is taxable (even at 0%), the supplier can claim FULL ITCs on all inputs used to make zero-rated supplies. Zero-rated supplies include: basic groceries; prescription drugs; most exported goods; international freight services; and certain medical devices. A business that exports 100% of its production: charges 0% GST to foreign customers but claims full ITCs on all Canadian inputs — resulting in a net GST refund every period. Full ITC Recovery
Exempt supplies (no GST charged) — the supply is NOT taxable. No GST is charged to customers. Because exempt supplies are not taxable, NO ITCs can be claimed on inputs used exclusively to make exempt supplies. Exempt supplies include: long-term residential rental; medical services; most educational services; financial services; and certain healthcare services. A business making only exempt supplies: charges no GST; cannot register for GST; cannot claim any ITCs on business inputs. All GST paid on inputs becomes a non-recoverable cost. No ITC Recovery
Mixed businesses (taxable + exempt supplies) — a business making both taxable (or zero-rated) and exempt supplies must register for GST (because it has taxable revenue), and must allocate inputs between taxable and exempt use. ITCs are claimable only on the taxable-use portion. The allocation method must be reasonable (typically square footage, revenue-based, or direct allocation) and consistently applied. Allocation Required
✓ The Fix
Confirm whether each of your supply types is taxable, zero-rated, or exempt by reviewing ETA Schedules V and VI. For businesses with mixed supplies: document and apply a consistent ITC allocation methodology. Confirm the allocation method with your CPA — an incorrect allocation applied consistently over several years creates a material ITC error that must be corrected on all affected returns.
9. Error: ITC Documentation Failures
ERROR
Claiming ITCs Without the Required Supporting Documentation
What CRA requires to support ITC claims: an ITC claim is only valid if supported by the documentation prescribed by the ETA. The required documentation varies by the amount of the ITC claim. CRA will disallow ITCs in an audit if the documentation requirements are not met — even if the underlying expense was legitimate.
| Purchase Amount | Minimum Documentation Required | Common Failure |
|---|---|---|
| Under $30 | Amount paid; supplier name; GST/HST paid | No receipt at all — claiming ITC from credit card statement with no backup |
| $30 to $149.99 | Supplier name and address; date; amount paid; GST/HST paid or supplier’s GST registration number | Receipt shows amount but not GST breakdown; no registration number |
| $150 and above | All of the above PLUS: purchaser’s name; description of property or service; terms of payment | Receipt is insufficient (no purchaser name); GST not separately identified on the invoice |
| Intercompany / related party transactions | All of the above plus arm’s-length pricing confirmation and business purpose documentation | Related party invoices without proper documentation; non-arm’s-length pricing |
✓ The Fix
Implement a receipt capture system (Dext, AutoEntry) that photographs every receipt immediately at time of purchase and archives it permanently. Ensure all supplier invoices include the supplier’s GST registration number (especially for purchases above $30). For purchases above $150: ensure the invoice is addressed to the business (not personally) and includes a description of goods/services. Keep all documentation for 6+ years from the relevant return date.
📈 Identify and Fix Every GST/HST Error in Your Filing History — Before CRA Does
Custom CPA conducts a comprehensive GST/HST filing review — checking rates, ITC claims, supply classification, place of supply, and documentation — identifying every error and implementing the corrections before CRA initiates a review.
10. CRA GST/HST Audit Triggers
Understanding what triggers a CRA GST/HST audit allows businesses to proactively review and correct errors before they are identified externally:
⚠️ CRA GST/HST Audit Trigger Checklist
Revenue discrepancy between HST return and T2 corporate return — CRA’s automated systems cross-reference the revenue reported on HST returns with income reported on T2 corporate income tax returns. An unexplained gap (revenue on T2 higher than HST-reported revenue, or vice versa) automatically flags a review request. The reconciliation must account for: HST-exempt income; zero-rated income; and any timing differences in revenue recognition. Most Common Trigger
Large or unusual ITC claims relative to revenue — if the ratio of ITCs claimed to taxable revenue is significantly higher than industry benchmarks, CRA flags the return for review. New businesses with large startup costs (equipment, leasehold improvements, inventory) may legitimately have high ITC ratios — but should be prepared to provide documentation for all claims. ITC Audit
Consistent refund patterns — businesses that consistently claim GST/HST refunds (net-negative returns) attract review — particularly if the industry type would not be expected to produce refunds. Legitimate refund patterns (exporters, zero-raters, new businesses with high capital investment) should be documented and explained proactively. Document Pattern
Late registration or first-time registration for established business — when a business that has been operating for several years suddenly registers for GST/HST, CRA’s system flags the late registration for review — looking for retroactive liability for the period before registration. Late Registration Risk
Industry-specific targeting — CRA periodically conducts sector-specific GST audit campaigns targeting industries with known high error rates: construction (holdback accounting, subcontractor ITC issues); restaurants and hospitality (cash sales underreporting); automotive (used vehicle transactions); professional practices (exempt vs. taxable supply classification). Industry Risk
11. How to Correct GST/HST Errors — The Official Process
📈 GST/HST Error Correction — Options and Process
Adjust on the next return — simplest for small errors — for errors discovered before the next return is filed: include the adjustment on the current period return. Under-reported tax from a prior period: add the shortfall to the current return’s tax collected line. Over-reported tax from a prior period: deduct from the current return. This approach is available if: the total net adjustments in the current period are below $1,000; and the error is not due to fraud or wilful non-compliance. Simplest Option
File a formal amended return (GST/HST rebate or adjustment) — for larger adjustments or when the error was in a filed return: contact CRA to request an adjustment to the specific return containing the error. For adjustments in the business’s favour (unclaimed ITCs, over-remitted tax): file a GST/HST general rebate application (Form GST189) or request an adjustment through My Business Account. Formal Process
Voluntary Disclosure Program (VDP) — for significant undisclosed errors — if the business has significant unreported GST/HST liability (unregistered periods, systematic under-reporting, unremitted collections), the VDP provides a path to compliance before CRA initiates contact. VDP advantages: penalty waiver; partial interest reduction; no referral for criminal investigation. VDP must be complete — all periods and all issues disclosed. Engage a CPA to manage the VDP application. For Major Issues
4-year limitation period — time is the critical constraint — adjustments in your favour (unclaimed ITCs, over-remitted tax) must be requested within 4 years of the original return’s filing deadline. ITCs not claimed within 4 years are permanently lost. Large businesses (annual revenue above $10M) have only 2 years. Review your prior-year HST returns annually to identify any unclaimed ITCs before the window closes. Time-Sensitive
Custom CPA’s GST/HST Compliance Service: Custom CPA provides comprehensive GST/HST compliance support for Canadian businesses — from registration and setup through quarterly return preparation, ITC optimization, supply classification review, place-of-supply analysis, and CRA audit representation. Our Core Accounting & Tax Services include GST/HST as an integrated component of year-round compliance. Our Specialized Services cover VDP applications and CRA audit representation for businesses with historical GST/HST compliance gaps.
12. Frequently Asked Questions
What happens if I make an error on my GST/HST return in Canada?▼
Discovering an error on a filed GST/HST return is a common situation — and CRA has specific processes for correcting errors that vary based on the nature, amount, and timing of the error. Here is the comprehensive framework: Types of errors and their consequences: underreporting tax collected (you collected more GST/HST from customers than you reported and remitted to CRA): CRA will assess the shortfall plus interest from the original due date. This is the most serious type of error because it involves collected funds that were not remitted. Interest runs from the day after the original due date. Overreporting tax collected (you remitted more than you collected): you are entitled to a refund or credit. CRA does not automatically refund overpayments — you must request the adjustment through the formal process. Underclaiming ITCs (you missed ITCs you were entitled to): you can claim the missed ITCs on a current return or request a formal adjustment. Subject to the 4-year limitation period from the return’s original filing deadline. Overclaiming ITCs (you claimed ITCs you were not entitled to): CRA will disallow the excess ITCs and assess the difference plus interest. This is the most common type of ITC error in CRA audits. The 4-year rule — the most important constraint: under Section 225.1 of the ETA, a registrant generally has 4 years from the return filing deadline for a reporting period to request adjustments in their favour (refunds, ITC corrections). For a quarterly return with a period ending December 31, 2021 (filed January 31, 2022): the 4-year window closes January 31, 2026. Any unclaimed ITCs from that period are permanently lost after January 31, 2026. For adjustments in CRA’s favour (additional amounts owing), the normal 4-year reassessment period applies — extended to 6 years or longer for misrepresentation. The correction process — three options: (1) Adjust on the next return: for small errors (net adjustment below $1,000), you can include the adjustment on the next return without filing a formal amendment. (2) File a formal adjustment request: contact CRA through My Business Account or mail an adjustment request referencing the specific period. For ITC underclaims: Form GST189 (General Application for Rebate of GST/HST). (3) Voluntary Disclosure Program: for larger, systematic errors or unregistered periods — VDP provides penalty waiver and may reduce interest in exchange for a complete disclosure. Always engage a CPA before making a formal adjustment or VDP application to ensure the disclosure is complete, accurate, and optimally presented to minimize penalties.
What is the penalty for filing GST/HST late in Canada?▼
GST/HST late filing penalties in Canada are automatic, calculated precisely, and cannot be waived through ignorance or mistake. Here is the comprehensive penalty framework: The basic late filing penalty (Section 280.1 of the ETA): if a GST/HST return is filed after the due date AND there is a net amount owing on the return: penalty = 1% of the amount owing per full month the return is overdue, maximum 12 months. Examples: $5,000 owing, filed 1 month late: $5,000 × 1% = $50 penalty. $5,000 owing, filed 6 months late: $5,000 × 6% = $300 penalty. $5,000 owing, filed 12 months late: $5,000 × 12% = $600 maximum filing penalty. Note: if no amount is owing on the return (refund position or nil return), there is no late-filing penalty — but filing must still occur. The repeated late-filing penalty (Section 280.2): if a failure-to-file penalty has been assessed on any of the 3 preceding years: the penalty rate increases to 2% per month, maximum 10 months (20% total). The repeated penalty escalation creates a compounding incentive to file on time consistently. A business that files 3 months late twice in 3 years could face 6% (first occurrence) and then 6% (at 2% × 3 months) on the second occurrence — with the repeated penalty rate locked in for 3 years after the last late filing. Compound daily interest (Section 280): in addition to the late-filing penalty, CRA charges compound daily interest on all unpaid amounts from the day after the filing due date. The interest rate is the prescribed rate plus 4% — typically 9–11% per year in 2026. Interest is not capped and continues to accrue until the full amount (including penalties) is paid. Director personal liability for corporations (Section 323): directors and officers of a corporation can be held personally liable for HST that the corporation collected but failed to remit. Personal liability includes the unremitted HST plus the full penalties and interest. Due diligence defence: a director can avoid personal liability by demonstrating they exercised due diligence to prevent the failure — but this is a high standard. Critically: personal liability for unremitted HST cannot typically be discharged through personal bankruptcy. This makes unremitted HST the single most dangerous tax obligation for incorporated business owners. The most important penalty avoidance rule — file even if you cannot pay: the late-filing penalty accrues because the return was not filed on time with an amount owing. If you file the return on time but cannot remit the full amount: no late-filing penalty; the amount owing plus daily compound interest accrues until payment. The interest cost alone on a $10,000 HST liability for 3 months is approximately $250 — much less than the $300 penalty (3% of $10,000) for filing 3 months late. File on time; pay as soon as possible; avoid the penalty by separating the filing obligation from the payment obligation.
What GST/HST input tax credits can small businesses claim in Canada?▼
Input tax credits (ITCs) are the mechanism by which registered businesses recover the GST/HST they paid on business inputs. Here is the comprehensive 2026 ITC entitlement framework: The basic ITC rule (Section 169 of the ETA): a registrant can claim an ITC for the GST/HST paid on property or services acquired for use in commercial activities (making taxable supplies, including zero-rated supplies). The ITC must be supported by prescribed documentation. The ITC must be claimed within 4 years of the return filing deadline for the period in which the expense was incurred (2 years for large businesses with revenue above $10M). Categories of eligible ITC claims: commercial rent and property costs: 100% ITC if the property is used exclusively for commercial activities (taxable or zero-rated supplies). No ITC if used exclusively for exempt supplies (residential rental). Proportional ITC if mixed use. Equipment and capital property: 100% ITC if used exclusively in commercial activities; proportional ITC for mixed commercial/personal use. If a computer is 80% for business and 20% personal: claim 80% of the GST/HST paid as an ITC. Vehicle expenses: ITC at the business-use percentage. Requires a mileage log to document business vs. personal use. Fuel, maintenance, insurance, repairs — all ITC-eligible at the business-use percentage. Professional services: 100% ITC on CPA fees, legal fees, consulting fees, business coaching — provided the services are for commercial activities. Advertising and marketing: 100% ITC for business advertising in Canadian publications, digital advertising platforms, and marketing materials. Meals and entertainment: 50% ITC — limited to 50% because the income tax deduction for meals and entertainment is also 50%. Technology and software: 100% ITC for SaaS subscriptions, website hosting, domain registration, and business software used in commercial activities. Categories NOT eligible for ITC claims: GST/HST paid on inputs used exclusively for exempt supplies (residential landlord’s maintenance costs, physician’s medical supply costs). Personal-use portion of mixed-use assets (personal portion of a mixed-use vehicle, personal portion of home expenses beyond the business-use ratio). Club memberships where the primary purpose is recreation or social enjoyment — specifically excluded under Section 170 of the ETA. Life insurance premiums — specific exclusion. Purchases from unregistered suppliers — no GST/HST was collected and remitted by the supplier, so there is no ITC to claim. The documentation requirement for ITC claims: every ITC claim must be supported by documentation as prescribed by the ETA: supplier name; GST registration number (for purchases of $30 and above); date; amount of tax paid. ITCs claimed without adequate documentation are disallowed in CRA audits — even if the underlying expense was legitimate. Implement a receipt capture system (Dext, AutoEntry) that photographs and archives every receipt and invoice permanently.
How does place of supply work for GST/HST in Canada?▼
Place of supply rules are the framework that determines which GST/HST rate applies to any given transaction — and they are one of the most commonly misunderstood and misapplied areas of Canadian sales tax compliance. Here is the comprehensive 2026 guide: Why place of supply matters: Canada has 5% GST in some provinces and 13–15% HST in others. For a business operating across provincial boundaries — selling to customers in multiple provinces — the rate charged depends on WHERE the supply is made, not where the seller is located. A Saskatchewan business (5% GST province) selling to an Ontario customer (13% HST) must charge 13% Ontario HST — not 5% Saskatchewan GST. Getting this wrong creates either an underpayment to CRA (charging too little) or an obligation to refund customers (charging too much). Place of supply for physical goods: the place of supply for physical goods is the province where the goods are delivered to the customer. For goods shipped by common carrier: the province of destination on the shipping address. For goods picked up by the customer: the province where the pickup occurs. For goods shipped from Canada to a foreign country (export): zero-rated (0% GST) — not subject to Canadian GST regardless of where the seller is. Place of supply for services: the place-of-supply rule for services depends on the type of service. Most services: the province where the service is primarily performed. For services related to real property: the province where the real property is located. For transportation services: the province where the journey starts. For telecommunications services: the province of the usual place of business of the recipient. For services performed partly inside and partly outside Canada: complex allocation rules apply. Place of supply for digital products and electronically delivered services: for digital products (ebooks, software downloads, online courses, streaming subscriptions) supplied to a Canadian customer: place of supply = province of the customer’s billing address or usual place of residence. This rule applies even if the seller has no physical presence in Canada — the 2021 digital economy measures extended this obligation to foreign digital service providers. For a Canadian digital products seller: charge the HST rate for the customer’s province based on billing address. Configure the billing/e-commerce system to automatically apply the correct rate. Practical implementation — how to get it right: e-commerce platforms (Shopify, WooCommerce, BigCommerce): all have province-based tax settings that can be configured to apply the correct GST/HST rate based on the delivery address. Review these settings at least annually to confirm they are current. Invoicing software (QuickBooks Online, FreshBooks, Wave): all support province-based GST/HST rates. Ensure each customer record has the correct province/address so the rate auto-applies. For B2B services across provinces: confirm whether the service is primarily performed in the seller’s or buyer’s province, and apply the correct rate accordingly.
What triggers a GST/HST audit from CRA in Canada?▼
CRA’s GST/HST audit selection uses both automated risk-scoring and targeted sector programs. Understanding what triggers an audit allows businesses to identify and address vulnerabilities proactively. Here is the comprehensive framework: Automated data-matching triggers: (1) Revenue discrepancy between HST return and T2 corporate return: CRA’s automated system compares the revenue reported on GST/HST returns with income reported on T2 corporate returns. If the T2 shows $800,000 in revenue but the HST returns only show $650,000 in taxable revenue, CRA wants to know why. Legitimate reasons for gaps: HST-exempt revenue (residential rental, medical services, financial services) not subject to HST reporting; timing differences between accrual accounting (T2) and cash-basis HST filing; zero-rated revenue that is taxable for HST purposes but reduces the effective HST rate. All legitimate gaps should be explainable and documented. (2) Large ITC claims relative to revenue: an ITC-to-taxable-revenue ratio that is significantly higher than industry norms triggers review. If a business has $200,000 in taxable revenue and claims $80,000 in ITCs (40% ratio), CRA wants to confirm the business is actually making taxable supplies of that scale and that the inputs are genuinely being used in commercial activities. (3) Consistent refund position: businesses that consistently receive GST/HST refunds (more ITCs than tax collected) are reviewed to confirm the refunds are legitimate. Exporting businesses, businesses making mostly zero-rated supplies, and businesses with large initial capital investments legitimately have refund positions — these should be documented and explained. (4) Sudden changes in filing patterns: a business that previously filed consistent quarterly returns and suddenly changes its position dramatically (large ITC claim after several years of modest ITCs, or sudden shift from net tax payable to consistent refunds) triggers a review. Registration and compliance triggers: (5) Late or missed registration: when a business that has been operating for several years without GST/HST registration suddenly registers, CRA identifies the registration date and compares it to income information on prior T2 returns to assess retroactive liability. (6) Prior audit history: businesses that have been audited before and had adjustments assessed are placed on a higher-risk monitoring list. A prior GST/HST audit that resulted in additional assessments increases the probability of a follow-up audit within 3–5 years. (7) Non-compliance in related entities: if a related corporation or principal (director, shareholder) has compliance issues, all related entities may be audited simultaneously. Industry-specific targeting programs: CRA conducts targeted GST/HST audit campaigns in industries known to have specific compliance challenges: construction and renovation (subcontractor ITC issues; holdback accounting; cash transactions); restaurants and food service (cash sales underreporting); automotive dealers and used vehicle transactions; professional practices (exempt vs. taxable supply classification for mixed healthcare/non-medical services); real estate development and new housing (builder self-supply rules; new housing rebates). If your business operates in one of these sectors: confirm your GST/HST treatment is correct before CRA selects you. A proactive CPA-led GST/HST compliance review is far less expensive than a CRA audit — and provides a defensible documented position if CRA does select the business for review.
Disclaimer: The above contents are provided for general guidance only, based on information believed to be accurate and complete, but we cannot guarantee its accuracy or completeness. It does not provide legal advice, nor can it or should it be relied upon. Please contact/consult a qualified tax professional specific to your case.
