Input Tax Credits: What Firms Verify Before Claiming GST/HST Back
what qualifies, the documentation tiers, the 50% meals limit and the four-year window
Input tax credits (ITCs) let a GST/HST registrant recover the GST/HST paid on purchases used in commercial activities. Claims must be supported by documentation that scales with the invoice amount, are subject to restrictions — meals and entertainment are generally limited to 50% — and most registrants have up to four years to claim a missed credit on a later return.
What is an input tax credit?
An input tax credit (ITC) is the mechanism that lets a GST/HST registrant recover the GST/HST paid or payable on purchases and expenses used in its commercial activities. Net tax each period is the tax collected minus the ITCs claimed — the credit is how GST/HST stays a consumption tax.
Only registrants can claim ITCs, and only to the extent a purchase relates to commercial activities — the making of taxable or zero-rated supplies. A business making exempt supplies gets no credit on the inputs to that activity, which is why a mixed business apportions its claims.
Which purchases qualify for ITCs?
Purchases and expenses consumed, used or supplied in the course of commercial activities: inventory, rent, professional fees, tools, capital equipment. Zero-rated suppliers qualify in full — they collect tax at 0% but still recover the GST/HST on their inputs. Inputs to exempt supplies do not qualify.
Capital property runs on its own rules. Movable capital property generally follows a primary-use test — more than 50% commercial use supports a full claim — while real property is generally apportioned to the proportion of commercial use. Change-in-use rules can later claw back or restore credits, so the initial characterisation is worth documenting.
What documentation does the CRA require for a claim?
Supporting information that scales with the invoice amount, in three tiers. The smallest purchases need only the seller's name, the date and the amount; the middle tier adds the supplier's GST/HST registration number and the tax detail; the top tier adds the buyer's name and the terms of sale.
The tier thresholds were last revised in 2021 — currently under $100, $100 to under $500, and $500 and over — and the exact requirements per tier are listed on the CRA's input tax credit page; re-verify them before relying on a minimal receipt. The supplier's registration number must also be valid, and the CRA's GST/HST Registry exists precisely so a claimant can confirm it before filing.
Which ITC claims are restricted or denied?
Several categories are limited or denied even where the purchase is clearly commercial. Meals and entertainment are generally restricted to 50%, matching the income tax limit. Club memberships whose main purpose is dining, recreation or sport are denied entirely. Personal-use portions of any expense never qualify.
Passenger vehicles carry their own ceiling: the credit on a purchased passenger vehicle is capped by reference to the same prescribed cost limit that caps capital cost allowance, an amount the government adjusts periodically. Where a purchase serves both commercial and exempt activity, only the commercial proportion survives — and the apportionment method must be reasonable and consistently applied.
How long do you have to claim an ITC?
Most registrants have up to four years, counted from the due date of the return for the period in which the credit first became claimable. Certain financial institutions and businesses with revenues above the CRA's threshold — currently $6 million — get two years instead.
The limit makes missed credits recoverable rather than lost: a documentation gap found during a file review can usually be fixed on a later return inside the window. It also means an ITC review is worth building into the bookkeeping cadence, not just the audit response.
Where are ITCs claimed, and when?
On the GST/HST return for the reporting period, netted against the tax collected. The claim deadline therefore rides on the client's assigned cadence — monthly, quarterly or annual — which is also what sets the due date of every return the credits appear on.
| Filing | Applies to | Filing deadline | Payment | If it is late |
|---|---|---|---|---|
| GST/HST returns — monthly and quarterly filers | Registrants with monthly or quarterly reporting periods. | File and pay one month after the end of each reporting period. | Payment is due on the same date as the return. | The late-filing penalty is A + (B × C), where A is 1% of the amount owing, B is 25% of A, and C is the number of complete months the return is late, to a maximum of 12 — so 1% plus 0.25% per month, capped at 4%. A further $250 applies where the return is filed after a demand to file. Compound daily interest runs on late amounts. |
| GST/HST returns — annual filers | Registrants with an annual reporting period. | File and pay three months after the fiscal year-end. Annual filers who are individuals with business income and a December 31 year-end instead file by June 15 and pay by April 30. | Annual filers with $3,000 or more of net tax generally must also pay quarterly GST/HST instalments. | The same A + (B × C) late-filing formula applies. |
How firms keep client ITC claims defensible
Make the documentation review part of the recurring work, not a scramble at audit. Firms using SpidNums put each client's GST/HST filing on its actual cadence in the Services catalogue, so a pre-filing ITC review lands as an ordered task on the period's project in Task Master.
Québec adds a parallel track: QST registrants claim input tax refunds under Québec's own statute, administered by Revenu Québec, so a Québec client's file carries two documentation trails rather than one. A custom field flagging dual-registered clients keeps that from being rediscovered every period.
Frequently asked questions
What is an input tax credit?
An input tax credit (ITC) is the credit a GST/HST registrant claims to recover the GST/HST paid or payable on purchases and expenses used in commercial activities. ITCs are deducted from the tax collected on the registrant's GST/HST return, so the business remits only the net amount. Only registrants can claim them, and only for the commercial portion of a purchase.
How many years back can you claim an input tax credit?
Most registrants have up to four years to claim a missed input tax credit, measured from the due date of the return for the period in which the credit first became claimable. Certain financial institutions and larger businesses above the CRA's revenue threshold have two years. A missed credit inside the window is claimed on a current return, not by amending the old one.
Can you claim ITCs on meals and entertainment?
Generally only 50% of the GST/HST paid on meals and entertainment can be claimed as an input tax credit, mirroring the income tax limitation on the same expenses. Club memberships whose main purpose is dining, recreation or sporting activities are denied entirely. The restriction applies even where the meal is clearly business-related.
Do zero-rated supplies allow input tax credits?
Yes. Zero-rated supplies are taxable at 0%, so a business making them — exports and basic groceries are the classic examples — collects no tax yet still claims full input tax credits on its inputs, and is often in a refund position. Exempt supplies are different: they sit outside the credit system, and inputs to exempt activities generate no ITCs.
What documentation does the CRA require for an ITC claim?
The requirements scale with the invoice amount in three tiers. The smallest purchases need the supplier's name, the invoice date and the amount; larger invoices add the supplier's GST/HST registration number and the tax detail; the largest add the recipient's name and terms. The supplier's number must be valid — the CRA's GST/HST Registry lets a claimant confirm it before filing.
Related guides
How firms run this
By province
Turn these dates into tickets.
SpidNums generates the work from each client's cadence and year-end, then ranks it by proximity.