The Canada Revenue Agency (CRA) doesn't automatically reject home office claims, but certain practices raise red flags that increase your chance of an audit. The key to avoiding scrutiny is keeping detailed records, claiming only legitimate expenses, and being honest about how much of your home you actually use for work. Most home office audits happen when deductions seem inflated compared to income, when personal expenses are mixed in, or when documentation is missing entirely. Understanding what triggers CRA attention can help you claim confidently and safely. The CRA doesn't have a specific audit threshold for home office claims, but certain patterns catch their attention more than others. - Expenses that exceed or nearly match gross income. If you claim $8,000 in home office costs but only earned $8,500, the CRA questions whether the expense claim is realistic. - Claiming 50% or more of your home. Unless you have a large dedicated space, high percentages invite closer review. - Inconsistent claims year to year. Jumping from $2,000 one year to $6,000 the next without explanation looks suspicious. - Mixing personal and business expenses. Claiming your entire internet bill, mortgage interest, or property taxes without clear calculation draws scrutiny.
There's no specific dollar threshold, but audits are more likely when home office expenses exceed 30-50% of gross income, when documentation is missing, or when claims seem inconsistent with your business. The CRA focuses on whether the claim is reasonable relative to your income and circumstances.
No. You must allocate these costs based on actual business use. If you use the internet 70% for work and 30% personally, claim only 70%. The CRA expects a reasonable split that you can defend with documentation.
The simplified method ($5 per square foot, no receipts) is generally lower risk because the calculation is transparent and requires minimal documentation. However, it usually results in a smaller deduction than the detailed method. Compare both options to see which works best for your situation.
Keep all receipts, invoices, and supporting documents for at least six years. The CRA can request documentation up to six years after you file your tax return.
These are complex claims that often trigger CRA scrutiny. Many tax professionals avoid claiming them on principal residence homes to reduce audit risk. Consult a tax professional about whether this CRA rule may apply to your specific situation.