Every GST/HST-registered e-commerce seller who buys inventory, pays platform fees, ships products, or uses software tools is paying GST/HST on those inputs. Input tax credits (ITCs) let you recover that tax by offsetting it against the GST/HST you collect from customers. The amount left after subtracting your ITCs from your collected tax is what you remit to the CRA, or if your ITCs exceed what you collected, you receive a refund.
For sellers with significant inventory purchases, platform fees, or capital equipment, ITCs represent a real dollar recovery. Failing to claim them is not a conservative position; it is an overpayment to the CRA.
Registration as the Starting Point
Only GST/HST registrants can claim ITCs. For most businesses, registration is mandatory once your taxable supplies exceed CAD $30,000, but the timing depends on how the threshold is crossed. For the threshold calculation, CRA generally looks at worldwide taxable supplies, including zero-rated supplies, made by you and your associates, and excludes items such as financial services, sales of capital property, and goodwill from the sale of a business. If you exceed CAD $30,000 in a single calendar quarter, you stop being a small supplier on the sale that takes you over the threshold and must start charging GST/HST on that sale. If you exceed CAD $30,000 over the previous four or fewer consecutive calendar quarters, but not in a single quarter, you generally stop being a small supplier at the end of the month after the quarter in which you crossed the threshold. Below the threshold, registration is voluntary if you make taxable supplies in Canada.
Registering voluntarily before crossing the threshold allows you to claim ITCs from the effective date of registration forward. A new registrant may also be eligible to claim ITCs on GST/HST embedded in certain property on hand at registration, such as inventory or capital property used in commercial activities, and on prepaid services or rent that relate to the period after registration. For a seller who buys inventory from Canadian suppliers that charge GST/HST, or who pays Amazon or Shopify fees that include HST, early voluntary registration can recover meaningful amounts. The trade-off is that you must also collect and remit GST/HST from customers, file returns on schedule, and maintain the required records. Whether the recovery outweighs the compliance burden depends on the size and mix of your taxable inputs.
The CRA’s GST/HST registration page covers the registration process and threshold rules in detail.
What Expenses Generate ITCs for E-Commerce Sellers
An ITC is available on any acquisition made for use in your commercial activity. Commercial activity includes taxable supplies you make in the course of a business. For an e-commerce seller, the following categories commonly generate ITCs:
Inventory purchased from Canadian suppliers. If your supplier is GST/HST registered and charges GST/HST on the sale, that tax is an ITC for you. This is the largest ITC source for many product-based sellers. The ITC equals the GST/HST shown on the supplier invoice.
Platform and marketplace fees. Canadian marketplace fees that include GST/HST are ITC-eligible. The section below addresses how to identify which platform fees include GST/HST and which do not.
Shipping and courier costs. Freight and courier services are usually taxable when the service is a domestic freight movement, but international freight and domestic legs that form part of an inbound or outbound international freight movement can be zero-rated. Canada Post postage and mail delivery services are not simply exempt; they have special place-of-supply rules, and the applicable GST/HST treatment depends on the shipment. Keep carrier invoices and postage records separate so you can identify the GST/HST-bearing portion.
Packaging materials. Boxes, poly mailers, labels, tape, and protective packing materials purchased from Canadian suppliers that charge GST/HST are ITC-eligible business inputs.
Business software and subscriptions. Accounting software, inventory management tools, design tools, and other software used in your business are potential ITC sources, subject to the supplier’s registration status described below.
Professional services. Accountants, bookkeepers, and lawyers providing services to your business charge GST/HST on their fees. The tax on those fees is an ITC.
Home office expenses. If you use part of your home for your business, a proportional ITC may be available on GST/HST-bearing home office costs such as utilities and internet, based on the square footage or percentage of use. The proportion must be reasonable and supportable.
Capital purchases. Equipment, computers, and other property used primarily in your commercial activity generate ITCs on the GST/HST paid at purchase. The ITC is claimed in the reporting period you acquire the item, not spread over its useful life.
Platform Fees: Canadian vs Foreign Suppliers
Whether a platform fee generates an ITC depends on the supplier’s registration status and where the supply originates.
Amazon Canada (amazon.ca selling fees). Amazon seller fees can generate ITCs when your Amazon tax invoices show GST/HST charged by a GST/HST-registered supplier. Your Seller Central tax invoices are the source document; do not assume every Amazon statement line includes recoverable GST/HST unless the invoice shows the tax and registration details.
Shopify. Shopify billing can generate ITCs when your Shopify invoice shows GST/HST on subscription, transaction, or other business fees. Download the tax invoices from your billing section and verify that they include the supplier and GST/HST registration information required to support the claim.
Non-resident digital service suppliers. Effective July 1, 2021, the CRA extended registration and collection obligations to certain non-resident digital-economy businesses. For cross-border digital products and services, the simplified GST/HST rules generally apply to supplies made to Canadian consumers and Canadian entities that are not registered under the normal GST/HST regime, once the supplier’s applicable threshold exceeds CAD $30,000.
However, there are two registration regimes: the normal regime and the simplified digital-economy regime. Suppliers registered under the simplified regime are not required to collect GST/HST from Canadian businesses that provide evidence that they are registered under the normal GST/HST regime.
The practical result for registered Canadian businesses: if you provide your GST/HST number to a non-resident digital supplier at the time of purchase, a supplier registered under the simplified regime should not charge GST/HST on that supply. If you are charged GST/HST by a simplified-regime supplier because you did not provide evidence of normal GST/HST registration, CRA says you cannot claim ITCs or a rebate for that tax. The correct approach is to provide your GST/HST number to all digital suppliers during account setup so the charge is eliminated or properly documented.
For suppliers registered under the normal GST/HST regime, ITCs are available in the normal way if the supplier charges GST/HST and your documentation meets the ITC information requirements.
Advertising platforms. Many digital advertising platforms have registered under the Canadian digital economy rules. Whether your advertising fees include GST/HST and whether ITCs are available depends on the supplier’s regime and whether you provided your GST/HST number during account setup. Review the tax documentation available in your ad account. If no GST/HST appears on statements and no registration number is available, the ITC cannot be claimed.
GST Paid at the Border on Imported Goods
When you import commercial goods into Canada for resale, the GST at 5% is payable on most goods at the time of importation and is assessed through the Canada Border Services Agency (CBSA). This tax is paid as part of the import accounting process, not to a supplier.
GST paid at the border is an ITC, provided the goods are acquired for use in your commercial activity and you have the required import documentation. Current CBSA guidance refers to the Commercial Accounting Declaration (CAD) in the CBSA Assessment and Revenue Management (CARM) system; your broker or import records should show the value for duty, customs duty, GST, and any other assessed amounts. If a customs broker processed the import on your behalf, request copies of all import accounting documents from the broker and retain them.
Import duties (tariffs) are not recoverable as ITCs. Only the GST portion of the import assessment generates an ITC. Review each import entry to separate the duty from the tax.
For e-commerce sellers who source inventory from the United States or Asia and import into Canada for FBA or domestic fulfillment, border GST on inventory can be a significant ITC source that is easy to overlook if import documentation is not connected to the accounting records.
Documentation Requirements
The ITC is not self-validating. The CRA’s Input Tax Credit Information Regulations set out the documentary evidence required to support a claim. The current requirements scale with the transaction size:
Under CAD $100: Required information includes the supplier’s business or trading name, the invoice date or the date the GST/HST was paid or became payable if no invoice was issued, and the total amount paid or payable.
CAD $100 to CAD $499.99: All of the above, plus the supplier’s or intermediary’s GST/HST registration number, an indication of the GST/HST charged or that GST/HST is included at the applicable rate, and the status of each supply if the invoice includes both taxable and exempt supplies.
CAD $500 and above: All of the above, plus the buyer’s name or trading name, a brief description of the property or services, and the terms of payment.
In practice, this means retaining the actual invoice, receipt, contract, or other business record that contains the prescribed information. A bank or card statement by itself usually does not contain enough detail to support an ITC. For platform fees and software subscriptions, download and store the official billing documents rather than relying on account summaries.
If a supplier fails to include their GST/HST registration number on an invoice, you can ask them to correct or re-issue it. Claiming an ITC without the required registration number on the invoice is a compliance risk.
The Quick Method and ITC Trade-Off
Some GST/HST registrants choose to account for tax using the Quick Method rather than the regular method. Under the Quick Method, you collect GST/HST at the full rate but remit at a lower flat rate on your taxable sales. The difference between what you collect and what you remit represents a simplified compensation for the GST/HST paid on your inputs.
The trade-off is that under the Quick Method, you generally cannot claim ITCs on your operating expenses. The flat remittance rate is designed to approximate the net of collected tax minus input tax credits, so the ITC claim is replaced by the rate reduction. ITCs remain available only for specific categories, such as purchases of real property and improvements to real property, capital assets such as computers and vehicles and improvements to those assets, purchases on which GST/HST became payable before the quick method election took effect, and a few other specified cases. You also receive a 1% credit on the first CAD $30,000 of eligible supplies each fiscal year if the election is in effect at the required time.
For sellers with low margins or high input costs, the Quick Method can produce a higher net tax cost than the regular method, even though the remittance rate is lower. The reason is that the Quick Method rate is calculated on gross sales including GST/HST collected, and for sellers paying significant GST/HST on inventory, platform fees, and shipping, the foregone ITCs can exceed the rate saving.
Whether the Quick Method is beneficial for your operation depends on your revenue mix, your supply province (rates differ by province of supply), and the volume of ITC-eligible inputs you purchase. This is a calculation that should be reviewed at registration and periodically as your cost structure changes.
The Quick Method is not available to all registrants. Excluded categories include bookkeeping, financial consulting, tax consulting, tax return preparation, legal, accounting, and actuarial services, as well as listed financial institutions, charities, public institutions, and certain public sector bodies. The revenue test is also specific: annual worldwide taxable supplies, including GST/HST and associated persons, generally must not be more than CAD $400,000 under CRA’s quick method calculation.
Mixed-Use Expenses and Commercial Activity Proportions
If you use an asset or service partly for commercial activity and partly for personal or exempt purposes, your ITC is limited to the commercial-use proportion.
The most common examples for e-commerce sellers are home office and vehicle expenses. If 20% of your home is used for business, and you pay GST/HST on utilities and internet billed to your home, 20% of that tax is an ITC. If you use a personal vehicle for business deliveries and personal use, the ITC on fuel, repairs, and maintenance is limited to the business-use percentage.
The CRA expects the allocation to be reasonable and to be supported by records. A dedicated office space with a measured square footage comparison is more defensible than an estimate. Vehicle business use is typically supported by a mileage log.
For a business that is entirely commercial with no personal-use component, the full GST/HST on inputs is available as an ITC with no allocation required.
Time Limits for Claiming ITCs
For most registrants, ITCs must be claimed by the due date of the GST/HST return for the last reporting period that ends within four years after the end of the reporting period in which the ITC could first have been claimed.
In practice, for most annual or quarterly filers, this means you have approximately four years to claim an ITC you missed or failed to claim in the original period. An ITC from a 2022 invoice can still be claimed on a 2023 or 2024 return, provided you are within the four-year window and have the required documentation.
Listed financial institutions and certain persons whose threshold amounts exceed CAD $6 million have a shorter two-year window. Most e-commerce sellers will fall under the four-year rule.
If you have unclaimed ITCs from prior periods, you do not need to file amended returns for those periods. You can claim the prior-period ITCs on a current return, with documentation available to support the original period transactions.
Claiming ITCs on Your GST/HST Return
ITCs are entered on line 106 of the GST/HST return instructions, labelled “GST/HST paid or payable (ITCs).” Line 108 is the total of ITCs and adjustments, and net tax on line 109 is calculated as line 105 minus line 108.
If line 108 exceeds line 105, the result is a refund. The CRA will issue a refund or apply it against other amounts owing depending on your account status.
Each ITC must be supported by documentation meeting the requirements above and available upon request. The CRA does not ask for receipts on filing, but they may request them in a review or audit. Maintaining organized records by period and by category makes any CRA inquiry manageable.
If you file quarterly or annually and your ITCs consistently exceed collected tax (common for early-stage sellers with high startup costs), consider requesting monthly filing to recover the refunds more quickly. Monthly filing is available on request and can improve cash flow during periods when input costs are high relative to sales.