How to Prepare for a CRA Audit: Receipt Tracking and Record Keeping

The CRA can audit your tax returns going back several years. If you are self-employed, claim significant deductions, or have business income, the probability of review is higher. This guide covers what the CRA expects, how long to keep records, and how to organize your documentation before an audit happens.

How Far Back Can the CRA Go?

The CRA's standard reassessment period is three years after the date of your original notice of assessment for individuals and four years for corporations. However, there are exceptions:

• No time limit in cases of misrepresentation due to neglect, carelessness, willful default, or fraud

In practice, the CRA most commonly reviews the last three to four tax years. But because of the misrepresentation exception, the standard advice is to keep all records for at least six years from the end of the tax year they relate to (the legal minimum under section 230 of the Income Tax Act).

What Records Must You Keep?

The CRA requires you to keep records that support every amount claimed on your tax return. For business expenses specifically, this means:

For Every Expense

• Receipt or invoice showing the vendor, date, amount, and what was purchased
• Proof of payment (bank statement, credit card statement, or cancelled cheque)
• Business purpose documentation — why was this a business expense?

For Vehicle Expenses

• Logbook with date, destination, purpose, and kilometres for every business trip
• Receipts for gas, insurance, repairs, and lease payments
• Odometer readings at the start and end of the year

For Home Office

• Measurements of your workspace and total home area
• Receipts or statements for rent, mortgage interest, utilities, insurance, and property taxes
• T2200 from your employer (if you are an employee)

For Capital Assets (CCA)

• Purchase receipts showing date, amount, and description
• Records of the CCA class and depreciation calculations
• Disposal records if you sold or scrapped an asset

For GST/HST

• All invoices issued (with GST/HST collected)
• All receipts with GST/HST paid (for input tax credit claims)
• GST/HST return working papers

What Does a CRA Audit Look Like?

A CRA review typically follows one of these paths:

Processing Review

The most common. The CRA sends a letter asking you to provide documentation for specific claims. You mail or upload the documents. If everything checks out, the review is closed. This is not a full audit.

Desk Audit

A CRA auditor reviews your file remotely and contacts you by phone or letter with questions. They may ask for additional documents beyond what you initially provided.

Field Audit

The most thorough. A CRA auditor visits your place of business (or home office) to examine records in person. This is relatively rare for individuals but more common for larger businesses.

What Triggers an Audit?

The CRA does not publish its exact selection criteria, but known risk factors include:

• Large or unusual deductions relative to your income
• Consistent losses year after year (the CRA may question whether your business is genuine)
• Round numbers on every line (suggests estimation rather than actual tracking)
• High vehicle expense claims without a logbook
• Home office deductions that seem disproportionate
• Cash-heavy businesses with limited paper trail
• Random selection — some audits are simply random

How to Organize Your Records

The best defence in an audit is well-organized records that you can produce quickly. Here is a practical system:

1. Keep Every Receipt

Paper receipts fade. Take a photo or scan immediately. Store the digital copy alongside the expense record. If the CRA asks for a receipt from 2019, you need to produce it.

2. Categorize by CRA Line Item

Organize expenses by the CRA category they belong to. "Office expenses" (line 8871), "Motor vehicle" (line 8521), "Professional fees" (line 8860). If each expense is already mapped to a line item, producing a summary for the CRA is trivial.

3. Maintain a Change History

If you change an expense record — correcting a date, updating an amount, recategorizing — keep a log of what changed, when, and why. The CRA values transparency. A correction is not suspicious. A correction with no record of the original is.

4. Verify Receipt Integrity

If you store receipts digitally, ensure they have not been altered. Checksum (hash) verification proves that the file you are presenting is identical to the file you originally stored.

5. Export Everything as a Package

When the CRA asks for documentation, the ideal response is a single organized package:

• Summary PDF with totals by CRA line item
• CSV exports of all expenses, filterable by category, date, and source
• All receipt images, named by date and vendor
• Vehicle logbook
• Home office calculation
• CCA depreciation schedule
• Integrity verification file

The faster and more thoroughly you can respond to a CRA request, the smoother the audit goes. Delays and incomplete responses invite deeper scrutiny.

Common Mistakes That Create Audit Problems

1. No receipts. "I know I spent it" is not documentation. Without a receipt, the CRA can deny the deduction entirely.
2. Mixing personal and business expenses. Use a separate bank account or credit card for business. Commingled finances make everything harder to prove.
3. Estimating instead of tracking. "About $200/month on office supplies" is not a record. Track each purchase individually.
4. Destroying records too early. Six years is the legal minimum. Storage is cheap; CRA penalties are not.
5. Inconsistent categorization. If you categorize internet as "office expenses" one year and "other expenses" the next, it looks sloppy. Pick a category and be consistent.

The Seven-Year Rule in Practice

If you file your 2026 tax return in April 2027, the CRA can review it until at least 2030 (three years for the normal reassessment period). In cases of misrepresentation due to neglect, carelessness, or fraud, there is no time limit.

This means records from 2026 should be kept until at least 2033 (six years from the end of the 2026 tax year). In practice, keep everything until you are absolutely certain the reassessment window has closed.

Digital storage makes this easy. A full year of expense records, receipts, and exports typically takes less than 1 GB. There is no reason to delete anything.

Sources

1. CRA Keeping Records
2. CRA Objections, Appeals, Disputes, and Relief Measures
3. CRA Taxpayer Bill of Rights
4. Income Tax Act, Section 230 - Records and Books
5. CRA What to Expect During an Audit