If your business is registered for GST/HST, you can recover the tax you paid on business purchases by claiming input tax credits (ITCs). However, the CRA’s documentation requirements for ITCs are stricter than for income tax deductions — a receipt that satisfies income tax requirements may still fail the ITC test. Understanding these rules prevents denied claims and potential penalties.
This guide explains the CRA’s three-tier documentation system under GST/HST Memorandum 8-4, common ITC mistakes, and how to ensure your receipts meet every requirement.
The Three-Tier Documentation System
The CRA requires different levels of detail based on the purchase amount (before tax):
Tier 1: Purchases Under $30
- Supplier’s name or trading name
- Date of the purchase
- Total amount paid
For small purchases, the GST/HST amount does not need to be shown separately — you can calculate it from the total. This tier applies to everyday items like coffee with a client, parking, and small office supplies.
Tier 2: Purchases $30 to $149.99
- Everything from Tier 1, plus:
- Supplier’s GST/HST registration number
- Terms of payment (cash, credit card, net 30, etc.)
- Description sufficient to identify the goods or services
- GST/HST amount charged (or a statement that the total includes GST/HST)
Tier 3: Purchases $150 and Above
- Everything from Tier 2, plus:
- Buyer’s name or business name
- GST/HST amount shown separately
- Itemized description of each good or service
This is the most common tier where ITC claims are denied. For large purchases like equipment, professional services, or software annual subscriptions, ensure the invoice includes your business name and separates the GST/HST clearly.
Supplier’s GST/HST Registration Number
For purchases of $30 or more, the supplier’s GST/HST registration number must appear on the receipt. This is a 9-digit business number followed by RT and a 4-digit account identifier (e.g., 123456789RT0001). If the number is missing, you cannot claim the ITC — even if you know the supplier is registered. Request a corrected invoice before filing.
Common ITC Mistakes
- Missing GST/HST registration number — the #1 reason ITCs are denied
- Claiming ITCs on exempt supplies — basic groceries, medical services, residential rent, and financial services are GST/HST-exempt. There is no GST/HST to claim back.
- Claiming 100% on meals — the 50% meal limitation applies to ITCs too
- Claiming ITCs for personal expenses — only business purchases qualify
- Wrong timing — ITCs must be claimed in the reporting period when you have both the documentation and the tax was payable
- Not claiming within the deadline — most businesses have four years from the due date of the return to claim missed ITCs
Quick Method of Accounting
Small businesses with annual taxable supplies of $400,000 or less (before GST/HST) can use the Quick Method. Instead of tracking ITCs on every purchase, you remit a flat percentage of revenue. You cannot claim ITCs on most purchases under this method, but the simplification often results in keeping more GST/HST collected. Discuss with your accountant whether this method makes sense for your business.
Keeping ITC-Ready Records
Every receipt used for an ITC claim must be kept for at least six years. The CRA can request any supporting document at any time during this period.
SparkReceipt’s AI receipt scanner captures all the details the CRA requires — vendor name, registration numbers, amounts, and tax breakdowns — in seconds. Every receipt is stored digitally, searchable, and exportable for your GST/HST return. Connect your email to automatically capture invoices from SaaS vendors and online purchases.
For complete receipt requirements across all expense types, see our guide to CRA receipt requirements.
This article is for informational purposes only and does not constitute tax advice. Consult a qualified Canadian tax professional for your specific situation.
