Learn when Ontario businesses can claim GST/HST input tax credits, required invoices, mixed-use purchases, vehicles, capital assets and mistakes.
You paid $113 for office supplies, including $13 HST. Can your business get that $13 back? Sometimes yes—but only if the purchase and your business meet the rules.
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What Is a GST/HST Input Tax Credit (ITC)?
An input tax credit (ITC) is how an eligible GST/HST-registered business recovers tax paid or payable on purchases used in its taxable commercial activities. You do not normally get a credit just because a receipt shows HST. Registration status, business use, invoice details and exemptions matter.
Which Business Purchases Qualify for HST Credits?
Find the situation closest to yours below. The answer explains the usual starting point; the detailed rules and exceptions come later.
Your situation | What it means | What to do next |
Supplies used fully for taxable business | The HST may be recoverable as an ITC if the usual rules are met. | Keep a proper supplier receipt. |
A phone used for work and personal calls | Only the business-use share may qualify. | Keep a reasonable allocation. |
Purchases used to provide exempt services | Normal ITCs may be restricted or unavailable. | Separate taxable and exempt activities. |
You bought a vehicle or capital item | Special rules and limits may apply. | Review the asset before claiming the HST. |
ITC Example: Claiming Tax on Business Office Supplies
A GST/HST-registered consultant buys eligible office supplies for $100 plus $13 HST, used entirely for taxable work. Subject to the receipt and other rules, the $13 may be an input tax credit. If the same purchase is 50% personal, claiming all $13 would generally be inappropriate.
How to Calculate and Record Eligible HST Input Credits
Step 1: Confirm that your GST/HST registration and business activity qualify.
Step 2: Check that HST was actually charged on an eligible purchase.
Step 3: Separate personal or exempt-use portions.
Step 4: Keep invoices and enter the eligible ITC on the correct return.
GST/HST Credit Terms Explained Simply
ITC: Input tax credit—a way to recover eligible GST/HST on purchases.
Commercial activity: Generally taxable business activity, including zero-rated supplies.
Exempt supply: A sale on which GST/HST is normally not charged and related ITCs are often restricted.
More ITC Rules for Vehicles, Mixed Use and CRA Reviews
What is an input tax credit?
A GST/HST input tax credit, or ITC, is generally how a registered business recovers qualifying GST/HST paid or payable on purchases used, consumed or supplied in its commercial activities. It is a sales-tax mechanism, not an extra deduction from income tax. For many taxable Ontario supplies, the HST rate is 13%; a valid ITC usually recovers the qualifying tax amount, not the pre-tax purchase price. Exempt supplies and non-commercial activity can restrict recovery.
Businesses that are not GST/HST registered generally cannot claim normal ITCs merely because they have an HST receipt. Review our Ontario HST registration guide first.
Can you claim an ITC before registering?
Ordinary ITCs generally require registrant status and an eligible acquisition in the applicable reporting period. Special rules can permit credits on certain property and services held when a business becomes registered, but the calculation depends on the type of asset, tax status, acquisition history and change-in-use rules. Do not assume six months of pre-registration invoices are fully recoverable.
Keep a dated list of property held on your effective registration date and ask for a specific review of inventory, capital goods and services bought just before registration. Voluntary registration can have trade-offs: tax collection, returns and evidence obligations begin as well as potential credits.
What do commercial use and exempt supplies mean?
Commercial activities generally include making taxable or zero-rated supplies, but not exempt supplies. A zero-rated export sale can still support ITCs, while exempt residential rents or certain financial/healthcare activities often do not. A business may make both taxable and exempt supplies, requiring allocation. For example, a clinic may have taxable ancillary sales alongside exempt healthcare services; the label 'medical business' does not settle GST/HST treatment. Calculate and document which costs support which activities.
A property used partly for private purposes needs a fair and supported business-use estimate, with detailed different rules for some capital property and financial institutions.
Required invoices: below $100, $100–$499.99 and $500+
CRA documentary requirements are tiered by the total amount paid or payable, not just HST. Below $100, evidence still has to identify core details such as supplier, date and amount. For transactions of $100 to $499.99, additional detail such as the supplier's GST/HST registration number becomes particularly important. At $500 and above, the purchaser's name or trading name and terms or description may be required under the specific regulation.
Electronic receipts can work if complete. Don't substitute a bank-card statement for a missing tax invoice: it proves a payment, not all elements required for an ITC. Verify current CRA receipt rules.
Common recurring costs and what can go wrong
Ordinary commercial office rent, business software subscriptions, advertising, supplies, courier fees and accounting bills may generate ITCs if GST/HST was properly charged and the use is eligible. A payment to an unregistered supplier may contain no GST/HST to recover. Bank interest and many financial services are exempt; no imagined 13% can be claimed. Wages and owner draws do not include GST/HST.
Imported services, online platforms and vendors based outside Canada can have different rules: confirm the vendor's invoice, actual tax charged, place of supply and any self-assessment obligation. Check supplier registration where appropriate and retain complete invoice PDFs.
Meals, entertainment, vehicles and home offices
Some ITCs are restricted or recaptured under special statutory rules, often relating to limitations on income-tax deduction of meals and entertainment, passenger vehicles or personal-use property. A business vehicle used 60% for work does not universally produce a simple 60% ITC on purchase; vehicle category, registrant type, ownership, capital-property rules, leases and changing use matter. Maintain contemporaneous business kilometres and trips.
For a home office, household expenses and residential rent require careful distinctions and allocation; do not claim tax that was never charged. Consult CRA's ITC guide for the proper category.
Capital purchases, improvement projects and changing use
A laptop, equipment, furnishings, vehicle or building may be capital property, subject to special ITC rules different from everyday operating purchases. Significant changes in business-use percentage may trigger adjustments, deemed supplies or basic tax content calculations. Residential real estate and new housing rules are particularly complex. Example: an owner buys a vehicle while making exempt supplies, later starts a taxable business, then changes personal/business use.
Reusing the same ITC percentage every year could be wrong. Keep acquisition agreements, dates, invoice values, tax charged, usage logs and eventual disposition records.
Quick Method and simplified accounting methods
Under the GST/HST Quick Method, eligible small businesses remit tax using prescribed percentage methods and generally cannot also take ordinary ITCs for most day-to-day purchases. Certain capital assets may qualify for ITCs subject to rules, and other exclusions apply. That is why a cheaper-looking remittance rate can sometimes be less favourable for a service business with high input HST.
Compare conventional accounting and Quick Method using projected sales, taxable purchases and eligibility before electing. The Quick Method is not the same as the simplified method of accounting for ITCs; confusing these two can distort returns.
Timing, deadlines, refunds and missed ITCs
A valid ITC is normally claimed on a GST/HST return, subject to the time limit that applies to the registrant. Many small businesses have a four-year claim period, while certain larger businesses or financial institutions can face shorter windows; specific circumstances and transitional rules matter. 'I found an invoice' does not automatically reopen an unlimited period. Record the supplier date, tax amount, reporting period, date paid or payable and the tax registration number.
If missed claims relate to filed periods, decide whether an adjustment or later allowable claim is appropriate based on CRA instructions and your business profile.
Audit-proof records: a practical file structure
Create a folder for each reporting period with sales-tax return, bank reconciliations, receipt ledger, vendor invoices, fixed asset schedule and supporting mileage or allocation calculations. Reconcile HST collected from sales to HST payable and tax on purchases to ITCs; cash accounting and revenue recognition may not line up perfectly. Document why a high-dollar expense was for commercial activity and how dual-use was apportioned.
For construction, real property, related-party transactions and cross-border purchases, add signed agreements and clear contemporaneous notes. Our monthly bookkeeping checklist shows how to maintain this evidence throughout the year.
Worked examples and red flags
Example 1: a registered consulting business pays $113 for eligible office stationery including $13 HST, has proper support and uses it fully commercially—an ITC of $13 may be available. Example 2: a company pays $500 in employee wages—there is no HST to recover. Example 3: a mixed-use phone bill includes HST but 40% personal use—business allocation and the applicable specific rule limit entitlement.
Example 4: a residential landlord pays HST on repairs for an exempt long-term residential rental; the tax is normally not recoverable through ordinary ITCs for that exempt activity. The same expense label can yield a different outcome depending on context.
Official sources and further reading
CRA: input tax credits and receipt requirements. CRA: documentary requirements for ITCs. Reviewed October 28, 2026; confirm detailed categories and reporting periods for your situation.
Related Presyz guides
Read our related guide: ontario gst hst registration 2026 threshold filing itcs
Read our related guide: monthly bookkeeping checklist for ontario self employed professionals
Need help applying these rules?
Presyz is a Toronto accounting and taxation firm serving individuals and small businesses. The examples above are educational, not a substitute for reviewing your transactions, filing year, documentary evidence and applicable law. Contact Presyz through this website for situation-specific accounting or tax assistance.
General educational information, not individualized tax, legal or financial advice. Verify current CRA requirements.