Input Tax Credits (ITCs) Complete Claiming Guide Canada 2026

1. What Is an Input Tax Credit?

An Input Tax Credit is the GST/HST you paid on a business purchase that you are entitled to recover from the Canada Revenue Agency. ITCs are the core mechanism that makes the GST/HST a value-added tax rather than a cascading sales tax. At each stage of the production and distribution chain, registered businesses collect GST/HST on their sales and claim credits for the GST/HST paid on their inputs. The effect is that GST/HST applies only to the value added at each stage — and the final consumer bears the full economic burden because they cannot claim ITCs.

For registered businesses, ITCs effectively make the GST/HST paid on business expenses recoverable. An Ontario business that spends $10,000 on office rent pays $1,300 in HST (13%). That $1,300 is claimed as an ITC on the next GST/HST return and either reduces the net tax remittance or generates a refund from CRA. Without ITCs, the $1,300 would be a permanent cost embedded in the price of every good and service in the economy — which is precisely how the system worked before the GST replaced the Manufacturers' Sales Tax in 1991.

2. How ITCs Work in Practice — The Return Calculation

Every GST/HST return requires two core numbers: the total GST/HST you collected on your taxable sales and the total GST/HST you paid on your eligible business purchases. The difference is your net tax.

Without ITCs, this business would remit the full $9,100 collected and absorb the $2,080 in HST paid on its inputs as a permanent cost. ITCs save the business $2,080 per quarter — $8,320 per year — which is why voluntary HST registration is almost always beneficial for businesses with significant taxable inputs, even before the $30,000 revenue threshold is reached.

3. The Four Conditions for ITC Eligibility

CRA requires that all four of the following conditions be met for an ITC claim to be valid. Missing any one condition results in denial of the ITC on audit.

4. Documentation Requirements by Invoice Size

CRA's documentation requirements for ITC claims scale with the total amount of the purchase. Smaller purchases require less detail. Larger purchases require the purchaser's name and the supplier's GST/HST number. Failing to meet the documentation standard for a given invoice tier means the ITC will be denied on audit — even if the HST was genuinely paid.

5. Most Common ITC-Eligible Business Expenses

The following table covers the business expenses most commonly claimed as ITCs by Canadian businesses. All assume the expense was incurred for use in commercial (taxable or zero-rated) activities and that valid documentation exists.

6. Restricted ITCs — Partial Claims

Certain categories of business expenses are ITC-eligible but restricted to less than the full amount of HST paid. These restrictions exist because the expense has a personal benefit component or because the Income Tax Act limits the deductibility of the underlying expense.

Meals and Entertainment — 50% Restriction

The ITC on meals and entertainment expenses incurred for business purposes is restricted to 50% of the HST paid. This mirrors the Income Tax Act rule that limits the income tax deduction for meals and entertainment to 50%. If you pay $226 for a business dinner ($200 meal + $26 HST), the eligible ITC is $13 (50% of $26) — not the full $26. The restriction applies to all meals, whether consumed while travelling, with clients or at business meetings. Certain narrow exceptions exist — including meals provided at office parties (six or fewer per year), meals included in the cost of a conference or convention, and meals provided to employees at a remote work camp.

Passenger Vehicles — Capital Cost Cap

The ITC on the purchase of a passenger vehicle used partly or entirely for business is restricted in two ways. First, the capital cost on which the ITC is calculated is capped at the CCA Class 10.1 ceiling — $37,000 in 2026 (before HST). This means the maximum federal ITC on a luxury vehicle in Ontario is 13% of $37,000 = $4,810 — regardless of what you actually paid. Second, if the vehicle is used partly for personal purposes, the ITC is further reduced by the personal-use percentage.

Vehicle Operating Expenses — Business Percentage

HST paid on fuel, maintenance, repairs, insurance and parking for a vehicle used partly for personal driving is claimable as an ITC only to the extent of the business-use percentage. The business-use percentage must be supported by a mileage logbook maintained throughout the year. CRA accepts a logbook maintained for a representative period (at least 12 consecutive months) that is updated in subsequent years for any significant changes in driving pattern. Without a logbook, CRA typically allows 50% business use on audit — which is almost always less than what the actual business use would have been if properly documented.

7. Blocked ITCs — Expenses Where No ITC Is Available

Certain expenses are completely blocked from ITC claims regardless of their business purpose. These are not restrictions (partial claims) — they are absolute prohibitions under the Excise Tax Act.

8. ITCs on Capital Property — Equipment, Vehicles and Real Property

ITCs on capital property — equipment, computers, furniture, vehicles and real property — are claimed differently from ITCs on regular operating expenses. The key rules are:

• Timing: The ITC on capital property is claimed in the reporting period in which the property is acquired (when the tax becomes payable) — not when the property is put into use. A computer purchased in March but not set up until May generates an ITC in the March reporting period.
• Full amount in one period: Unlike CCA for income tax purposes (which is claimed over multiple years), the GST/HST ITC on capital property is claimed in full in a single reporting period. There is no half-year rule or declining balance for ITC purposes.
• Business-use percentage: If capital property is used partly for personal purposes or partly for exempt activities, the ITC is limited to the commercial-use percentage at the time of acquisition.
• Change-in-use adjustments: If the commercial-use percentage changes after acquisition (you start using a business vehicle more for personal trips, or you convert a commercial property to residential rental), a change-in-use adjustment is required — either recovering additional ITCs or repaying previously claimed ITCs.

9. Change-in-Use Rules — When Your ITC Must Be Adjusted

When the proportion of commercial vs. personal or exempt use of a capital asset changes, CRA requires an adjustment to the ITC originally claimed. The change-in-use rules ensure that ITCs reflect the actual commercial use of an asset over its life — not just its use at the time of acquisition.

Change-in-use adjustments for capital property are reported on your GST/HST return in the period the change occurs. For real property, the 10%/90% threshold applies — a change in commercial use that stays within the 10–90% range triggers a proportional adjustment, while crossing the thresholds triggers a full deemed disposition and reacquisition.

10. Pre-Registration ITCs — Recovering HST Paid Before You Registered

One of the most valuable and least understood ITC rules allows you to claim ITCs on purchases made before your GST/HST registration — retroactively — subject to specific time limits.

11. Time Limits for Claiming ITCs

ITCs must be claimed within a specific time period after the reporting period in which the tax was paid. If the time limit expires, the ITC is permanently lost — even if the HST was validly paid and all documentation exists.

The 4-year deadline is firm. A business that discovers a missed ITC from 5 years ago cannot recover it regardless of the circumstances. This is why quarterly reconciliation of HST paid on all business purchases — not just an annual review at return filing time — is essential. A missed quarterly ITC is recoverable for 4 years. A missed ITC that is never identified is gone.

12. Deemed ITCs — Employee Vehicle Allowances

When an employer pays a reasonable per-kilometre vehicle allowance to an employee who uses their personal vehicle for business travel, the employer is entitled to claim a deemed ITC on the allowance paid — even though the employer did not directly purchase fuel or vehicle services. The deemed ITC recognises that the employee paid GST/HST on their fuel, maintenance and other vehicle costs — and the employer's allowance effectively reimburses those costs.

The deemed ITC is calculated as a fraction of the allowance: the HST rate divided by (100 + HST rate) applied to the total allowance. In Ontario at 13% HST, the deemed ITC is 13/113 of the total per-kilometre allowance paid. The allowance must be reasonable — CRA publishes annual per-kilometre rates (73 cents for the first 5,000 km and 67 cents for each additional km in 2026) which serve as the benchmark for reasonableness.

13. Mixed-Use Property — Apportionment Methods

When a business expense relates to both commercial (taxable or zero-rated) activities and non-commercial (exempt or personal) activities, the ITC must be apportioned to reflect only the commercial-use portion. CRA requires a reasonable apportionment method applied consistently from period to period.

Common Apportionment Methods

• Square footage: Used for home offices, shared buildings, mixed-use real property. The ITC is based on the percentage of total square footage used exclusively for commercial activities.
• Revenue ratio: Used for businesses that make both taxable and exempt supplies. The ITC is based on the ratio of taxable revenue to total revenue. Common for medical practices with a mix of exempt healthcare and taxable consulting income.
• Time-based: Used for assets like vehicles and equipment that are shared between commercial and non-commercial use. The ITC is based on the proportion of time the asset is used for commercial purposes.
• Direct allocation: Where an expense can be identified as relating entirely to one activity (e.g., advertising for your taxable products vs. equipment for your exempt healthcare services), the ITC is allocated directly — 100% for the commercial expense, 0% for the exempt expense.

14. Exempt Supplies — Why No ITCs Are Available

If your business makes exempt supplies — long-term residential rent, most healthcare services, most financial services, childcare, educational tuition — you do not charge GST/HST on those supplies. As a result, you cannot claim ITCs on the expenses you incur to make those exempt supplies. The HST you pay on exempt-activity expenses is a permanent, non-recoverable cost that must be factored into your pricing.

This rule has significant financial implications for businesses that make a mix of taxable and exempt supplies. A medical clinic that provides both exempt healthcare services and taxable consulting services must apportion every shared expense (rent, utilities, administrative staff, insurance) between the two activities — and can only claim ITCs on the portion attributed to the taxable consulting work. Expenses used exclusively for the exempt healthcare services generate zero ITCs.

15. ITCs and the Quick Method of Accounting

Businesses that have elected the Quick Method of accounting for GST/HST do not claim individual ITCs on their operating expenses. Instead, the Quick Method remittance rate (8.8% of HST-inclusive revenue for Ontario service businesses, 1.8% for goods sellers) is designed to approximate the average net tax after ITCs for a typical small business in that category.

However, there is one important exception: businesses using the Quick Method can still claim the full ITC on capital property purchases over $30,000 (before tax). This means a Quick Method business that buys a $50,000 piece of equipment still claims the full $6,500 Ontario HST as an ITC on that purchase — in addition to remitting at the Quick Method rate on its revenue. For businesses that make significant capital purchases, this exception can make the Quick Method substantially more beneficial than the regular method in the year of acquisition.

16. Bad Debt Adjustments — Recovering HST on Unpaid Invoices

If you billed a customer, collected HST on the invoice, remitted the HST to CRA on your return, and the customer subsequently does not pay — you are entitled to recover the HST you remitted on the uncollected amount. This is a bad debt adjustment, not technically an ITC, but it is claimed on the same GST/HST return and has the same effect of reducing your net tax.

The adjustment equals the HST fraction of the amount written off as a bad debt: 13/113 of the uncollected amount in Ontario. For a $10,000 unpaid Ontario invoice, the HST recovery is $1,150.44 (13/113 × $10,000). The debt must have been written off in your books, and the amount must have been previously included in your GST/HST return as collected tax. The claim must be made within four years of the day the debt was written off.

17. Most Common ITC Mistakes CRA Catches on Audit